C502 94 by Arif Mohammed

American

Water Works Association

ANSIIAWWA C502-94 (Revision of ANS1/AWWA C502-85)

A @ AWWA STANDARD FOR

DRY-BARREL FIRE HYDRANTS

%---

Effective date: Sept. 1, 1995. First edition approved by AWWA Board of Directors June 24, 1913. This edition approved June 23, 1994. Approved by American National Standards Institute May 10, 1995. Addendum C502a-95 approved by the AWWA Board of Directors, Jan. 22, 1995. Addendum approved by American National Standards Institute, June 12, 1995. Changes specifwd in the addendum are incorporated into Sec. 3.2.5.5 and Sec. 5.3.1.

AMERICAN WATER WORKS ASSOCIATION 6666 West Quincy Avenue, Denver, Colorado 80235

AWNA Standard This document is an American Water Works Association (AWWA) standard. It is not a specification. AWWA standards describe minimum requirements and do not contain all of the engineering and administrative information normally contained in specifications. The AWWA standards usually contain options that must be evaluated by the user of the standard. Until each optional feature is specified by the user, the product or service is not fidly defined. AWWA publication of a standard does not constitute endorsement of any product or product type, nor does AWWA test, certi~, or approve any product. The use of AWWA standards is entirely voluntary. AWWA standanls are intended to represent a consensus of the water supply industry that the product described will provide satisfactory service. When AWWA revises or withdraws this standard, an official notice of action will be placed on the first page of the classified advertising section of Journal AWWA. The action becomes effective on the f~st day of the month following the month of Journal AWWA publication of the official notice.

American National Standard An American National Standard implies a consensus of those substantially concerned with its scope and previsions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether that person has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming tn the standad. American National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. Producers of goods made in conformity with an American National Standard are encouraged to state on their own responsibility in advertising and promotional materials or on tags or labels that the goods are produced in conformity with particular American Nâ&#x20AC;&#x2122;ational Standards. CAUTIONNOTICE:The American National Standards Institute (ANSI) approval date on the front cover of this standard indicates completion of the ANSI approval process. This American National Standard may be revised or withdrawn at any time. ANSI procedures require that action be taken to reaffi, revise, or withdraw this standard no later than five years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute, 11 W. 42nd St., New York, NY 10036; (212) 642-4900.

Committee Personnel The Standards Committee on Fire Hydrants, which reviewed and approved this standard, had the following persormel at the time of approval: Charles E. Reuben, Chair Larry R. Dunn, Secretary Consumer Members S.F. Gordeq Portland Water District, Portland, Maine L.E. Leoq Los Angeles Fire Department, Los Angeles, Calif. T.W. Knowlton,* Salem-Beverly Water Supply Board, Beverly, Mass. R.S. Porter, Erie County Water Authority, BufTalo, N.Y. W.E. Powers, City of Milwaukee, Water Engineering Division, Milwaukee, Wis. C.E. Reuben, Los Angeles Department of Water and Power, Los Angeles, Calif. D.J. Seargeant, City of Edmonton Water Branch, Edmonton, Alta. L.G. Thomas, East Bay Municipal Utilities District, Oakland, Calif. D.L. Tippin, Tampa Water Department, Tampa, Fla. W.T. Whitman Jr., Sprir@eld Water Department, Springfield, Mass.

(NEWWA) (AWWA) (NEWWA) (AWWA) (AWWA) (AWWA) (AWWA) (AWWA) (AWWA) (AWWA)

General Interest Members E.E. Arasmith, Arasmith Consulting Resource, Albany, Ore. E.E. Baruth,~ Standards Engineer Liaison, AWWA, Denver, Colo. K.M. Bell, Underwriters Laboratories Inc., Northbrook, Ill. J.K Bouchard, Sedgwick James of New England, Boston, Mass. T.J. Brown Jr., Factory Mutual Research Corporation, Norwood, Mass. K.J. Carl, Baldwin, N.Y. J.B. Donohoe, Birmingham, Ala. T.C. Jester, Consulting Engineer, Birmingham, Ala. E.W. Misichko,* Underwriters Laboratories Inc., Northbrook, Ill. D.F. Newnham,~ Council Liaison, City of Altamonte Springs, Altamonte Springs, Fla. E.F. Straw, 1S0 Commercial Risk Services Inc., Duluth, Ga.

(AWWA) (AWWA) (UL) (AWWA) (FMRC) (AWWA) (AWWA) (AWWA) (UL) (AWWA) (1S0)

Producer Members Jerry Bottenfield, Clew Valve Company, Oskaloosa, Iowa G.L. Bout, Mueller Company, Decatur, Ill. L.C. Carl, Kennedy Valve Companyj Elmira, N.Y.

*Alternate ~Liaison, nonvoting

...

(AWWA) (AWWA) (AWWA)

L.R. Dunn, U.S. Pipe & Foundry Company, Birmingham, Ala. R.L. Larki~ American Flow Control, Birmingham, Ala. J.L. Lynn, James Jones Company, El Monte, Calif. P.I. McGrath Jr.,* U.S. Pipe & Foundry Company, Birmingham, Ala. H.E. Otte, Waterous Company, South St. Paul, Minn. M.P. Yoke, M&H Valve Company, Anniston, Ala.

*Altm-nate

(AWWA) (MSS) (AWWA) (AWWA) (AWWA) (AWWA)

Contents u PAGE

SEC.

Foreword I II III Iv

v VI

History of Standard ........................ vii

Discussion ....................................... vii Acceptance ...................................... viii Information Regarding Use of This Standard ............................ ix Modification to Standard .................. x Major Revisions ................................. x

Standard 1

General

1.1 1.2 1.3

1.6 1.7 1.8

Scope ................................................... Defititiom .......................................... References .......................................... Data to Be Supplied by the Pumhaser ......................................... Data to Be Supplied by the Manufacturer ................................... Imtflation ......................................... ~ldavit of Compliance ..................... Pemeation .........................................

Materials

2.1 2.2

General ............................................... 4 Physical and Chemical Properties of Components .............. 4

General and Detailed Design

3.1 3.2 3.3 3.4 3.5

General Design .................................. 5 Detailed Design ................................. 6 Hydrant Inlet ..................................... 8 Valves ................................................. 8 Packing Glands and PackingGland Bolts ...................................... 9 Seals ................................................... 9 Bolts and Nuts ................................. 10

1.4 1.5

3.6 3.7

1 1 2

PAGE

SEC.

Workmanship and Painting

4.1 4.2

Workmanship ................................... 10 Painti~ ............................................ 10

Testing and Inspection

5.1 5.2 5.3

Production Testing .......................... 11 Prototype Testing ............................ 11 Inspection and Rejection ................. 12

Marking and Shipping

6.1 6.2

Marfing ............................................ 12 Sfipping ........................................... 12

Appendixes A

Characteristics of National Standard Fire-Hose Coupling Screw Thread ........... 13

Uniform Color Scheme for Fire Hydrants

B.1

Classification

B.1.l

Capacity Rating ............................... 14

B.2

Color Scheme

B.2.1 B.2.2

Public Hydrants ............................... 15 Private Hydrants ............................. 15

B.3

Location Markers ......................... 15

B.4

Capacity .......................................... 15

3 3 3 3 4

Tables 1 2

Physical and Chemical Requirements .................................. 5 Grades of Bronze Used in Hydrant Components ..................... 6

SEC.

3 4 5

PAGE

SEC.

Minimum Wall Thicknesses ............. 7 Dimensions of Poured Joints ............ 8 Maximum Permissible Loss of Head for Hydrants ........................ 12

A. 1

A.2

PAGE

Nominal Dimensions of Standard Fire-Hose Coupling Screw Threads .......................................... 13 Basic Dimensions of Standard Fire-Hose Coupling Threads ........ 13

Foreword This foreword is for information only and is not a part of AWWA C502.

I. History of Standard. This standard covers dry-barrel fire hydrants that are intended for use in water supply systems in all climates, including those where freezing temperatures occur. Wet-barrel fire hydranta, which are intended for use only in areas where the climate is mild and freezing temperatures do not occur, are covered in AWWA C503, Standard for Wet-Barrel Fire Hydrants. The first edition of this standard was approved on June 24, 1913, as â&#x20AC;&#x153;Standard Specifications for Hydrants and Valves.â&#x20AC;? It was subsequently revised on June 9, 1916; June 10, 1937; Aug. 10, 1938; Jan. 17, 1940; Feb. 20, 1943; Mar. 16, 1953; Jan. 27, 1964; Jan. 29, 1973; Jan. 28, 1980; and Jan. 27, 1985. II. Discussion. A fire hydrant is usually a unit of a water utilityâ&#x20AC;&#x2122;s property that is provided for public fire-protection service. However, during fire emergencies it is operated by members of the fire department rather than by water utility personnel. The use of fire hydrants as a source of water for street cleaning, construction projects, or for any purpose other than fire fighting is beyond the primary purpose for which the units are installed. Such usage of hydrants should be rigidly restricted and controlled in the interest of keeping the equipment in good working order for use during times of fire. The water utility, unless expressly relieved by the fire department in accordance with a written agreement, public ordinance, or other ownership, should schedule regular and sufficiently frequent inspections of hydrants to ensure that they are in good working condition. AWWA Manual M17, Installation, Field Testing, and Maintenance of Fire Hydrants, provides an excellent guide for owners of fire hydrants. Hydrants produced according to AWWA C502 are designed to be operated by one person using a 15-in. (380-mm) wrench. The use of a longer wrench or an indefinite extender operated by two or more persons is not considered to be good practice. If one person cannot open and close a fire hydrant with a 15-in. (380-mm) wrench, then it is not in proper working order and should be promptly repaired. Wrenches for fire hydrants should be constructed so that the openings can be readily reversed. Hydrants produced according to AWWA C502 are required to meet a test of 200 lbf=ft (270 Nom) torque applied at the operating nut in both opening and closing directions. This torque is considered to be fully adequate to operate a hydrant that is in good working condition. Hydrants with barrels longer than 5 ft (1.5 m) of bury may require special design. Hydrants with a single 2Vz-in. (64-mm) outlet nozzle are not considered to be suitable for normal fire-protection service. Table 4 of the standard does not show permissible loss of head above a flow of 1,000 gpm (227 m3/h). If hydrants are to be required to deliver more than this flow, then the manufacturer should be consulted on head losses at higher flows for the products.

III. Acceptance.* In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certKlcation program for all direct and indirect drinking water additives. Other members of the original consortium included the American Water Works Association Research Foundation (AWWARF) and the Conference of State Health and Environmental Managers (COSHEM). The American Water Works Association (AWWA) and the Association of State Drinking Water Administrators (ASDWA) joined later. In the United States, authority to regulate products for use in or contact with drinking water rests with individual states.~ Local agencies may choose to impose requirements more stringent than those required by the state. To evaluate the health effects of products and drinking water additives from such products, state and local agencies may use various references, including 1. An advisory program formerly administered by the USEPA, (lflice of Drinking Water, discontinued on Apr. 7, 1990. 2. Specifk policies of the state or local agency. 3. Two standards developed under the direction of NSF International (NSF): ANSI$/NSF$ 60, Drinking Water Treatment Chemicals — Health Effects, and ANSUNSF 61, Drinking Water System Components — Health Effects. 4. Other references, including AWWA standards, Food Chemicals CO&X, Water Chemicals Codex,** and other standards considered appropriate by the state or local agency. Various certifkation organizations may be involved in certifying products in accordance with ANSIINSF 61. Individual states or local agencies have authority to accept or accredit certification organizations within their jurisdiction. Accreditation of certifkation organizations may vary from jurisdiction to jurisdiction. Appendix A “Toxicology Review and Evaluation Procedures” to NSF 61 does not stipulate a maximum allowable level (hI.AL) of a contaminant for substances not regulated by a USEPA final maximum contaminant level (MCL). The MALs of an unspecified list of “unregulated contaminants” are based on toxicity testing guidelines (noncarcinogens) and risk characterization methodology (carcinogens). Use of Appendix A procedures may not always be identical, depending on the certiiler. AWWA C502-94 does not address additives requirements. Thus, users of this standard should consult the appropriate state or local agency having jurisdiction to 1. Determine additives requirements, including applicable standards. 2. Determine the status of certifications by all parties offering to certify products for contact with, or treatment of, drinking water. 3. Determine current information on product certification.

*When used as intended, fire hydrants are not normally in contact with drinking water. At the time of this revision to AWWA C502, a determination had not been made on whether fire hydrants would be considered within the scope of ANSIINSF 61. ~Persons living in Canada, Mexico, and non-North American countxies should contact the appropriate authori~ having jurisdiction. ~American National Standards Institute, 11 W. 42nd St., New York, NY 10036. $NSF International, 3475 Plymouth Rd., Ann Arbor, MI 48106. **Both publications available from National Academy of Sciences, 2102 Constitution Ave. NW, Washington, DC 20418.

IV. Information Regarding Use of This Standard. When hydrants are to be purchased in accordance with this standard, the purchaser’s specifications should provide specific information covering the following: Essential information 1. Standard used — that is, AWWA C502, Standard for Dry-Barrel Fire Hydrants. 2. Quantity required. 3. Length of bury, to nearest % ft (152 mm) (Sec. 3.2.4). 4. Number of hose and pumper outlet nozzles. 5. Nominal inside diameter of the outlet nozzles, in inches (or millimetres). 6. Type of outlet-nozzle threads. Outlet-nozzle threads should conform to those in service in the system where the hydrant is to be installed. If the threads are to conform with National Fire Protection Association (NFPA)* 1963, Standard for Fire Hose Connections, reproduced in part in appendix A of this standard, this requirement should be specified. If the threads are not of this type, then the following thread detail dimensions should be specified (or a suitable sample supplied): major diameter, minor diameter, pitch diameter, thread form, and number of threads per inch. 7. Size of hydrant, designated by the nomiml diameter of the main valve opening (Sec. 3.4. 1.4). 8. Size and type of irilet connection and joint accessories, such as gaskets, bolts, or nuts, if any (Sec. 3.3). 9. Direction of rotation of the operating nut to open the hydrant; that is, left (counterclockwise) or right (clockwise). This direction should conform to the practice in the system where the hydrant is to be installed (Sec. 3.2.5.3). 10. Color of the finish paint above the ground line and any special paint requirements (Sec. 4.2.2 and Sec. 4.2.3). 11. Location to which hydrants are to be shipped and any special shipping instructions or requirements (Sec. 6.2). Optwnnl information (if requiwd by purchaser) 1. Alternate materials if the water that will be used in the hydrants promotes galvanic “corrosion (Sec. 2.2.5.1, also, consult manufacturers). 2. Type of shutoff if there is a preference (Sec. 1.1). 3. Special designa or features ( Sec. 1.4 and Sec. 3.1). 4. Catalog and maintenance data, net weight, and drawings. Specify whether drawings are to be accepted before the manufacture of the hydrants (Sec. 1.5). 5. AfYidavit of compliance (Sec. 1.7). 6. Records of standard tests (Sec. 5.1). 7. Corrosion-resistant bolts and nuts (Sec. 3.7). 8. Harnessing lugs (Sec. 3.3.2). 9. Outlet-nozzle cap chains and cap gasket if not desired (Sec. 3.2.3.2). 10. Drain outlet — whether it is to be omitted or retained and tapped for drain pipe (Sec. 3.4.2). 11. Operating and outlet-nozzle cap nuts — if different from those specified in this standard and if special protection of the operating nut is required (Sec. 3.2.5.5). 12. Whether inspection is required (Sec. 5.3.1).

*National Fire Protection Association, One Batterymarch Park, Quincy, MA 02269.

V. Modification to Standard. Any modification of the provisions, definitions, or terminology in this standard must be provided in the purchaser’s specifications. VI. Major Revisions. The following are the principal changes in this standani: 1. Edited throughout to conform with the current AWWA recommended format. 2. Added Sec. III, Acceptance, and Sec. V, Modification to Standard, to the foreword. 3. Added Sec. 1.2, Definitions. 4. Added Sec. 1.8, Permeation. 5. Added Sec. 2.2.5.2 limiting lead content in brass or bronze components to a maximum of 8 percent. 6. Revised Sec. 3.1.1, Working Pressure, changing the design working pressure from “150 psig (1,034 kpa [gauge])” to “minimum working pressure of 150 psig (1,034 k.pa [gauge] ).” 7. Added Sec. 3.1.2, Material Stress Limits. 8. Added Table 4, Dimensions of Poured Joints (derived from withdrawn standard ANS17AWWA C 108/A2 1.8-75). 9. Revised the provisions of Sec.4. 1.2, Castings.

American

Water Works Association A @

ANSIIAWWA C502-94 (Revision of ANS1/AWWA C502-85)

â&#x20AC;&#x2DC;

AWWA

STANDARD

FOR

DRY-BARREL FIRE HYDRANTS

SECTION

1: GENERAL

Sec. 1.1 Scope This standard covers post-type, dry-barrel fire hydrants with compression shutoff (opening against or with the pressure) or gate shutoff for use in water supply service in all climates, including those where freezing occurs. 1.1.1 Exceptions. This standard does not cover the wet-barrel or flush type of hydrants. (For wet-barrel type, see AWWA C503. For flush type, see AWWA Manual M17, Installation, Field Testing, and Maintenance of Fire Hydrants.) Sec. 1.2 Definitions

In this standard the following definitions shall apply: 1.2.1 Cosmetic defect: A blemish that has no effect on the ability of a component to meet the structural design and production test requirements of this standard. Should the blemish or the activity of plugging, welding, grinding, or repairing such blemish cause the component to fail these requirements, then the blemish shall be considered a structural defect. 1.2.2 Manufizcturer: The party that manufactures, fabricates, or produces materials or products. 1.2.3 Purchaser: The person, company, or organization that purchases any materials or work to be performed. 1.2.4 Structural defect: A flaw that causes a component to fail the structural design or test requirements of this standard. This includes but is not limited to imperfections that result in leakage through the walls of a casting, failure to meet minimum wall thickness requirements, or failure to meet production tests. 1.2.5 Supplier: The party who supplies materials or services. A supplier may or may not be the manufacturer. 1.2.6 General: For preferred terminology for dry-barrel hydrant component nomenclature, see AWWA Manual M17.

AWWA C502-94

Sec. 1.3 References This standard references the following documents. In their latest revision, they form a part of this standard to the extent specified herein. In any case of conflict, the requirements of this standard shall prevail. ANSI*AS~-568A — Aerospace Size Standard for O-rings. ANSI/ASME$ B 18.2.1 — Square and Hex Bolts and Screws, Inch Series. ASTM$ A47 — Standard Specification for Ferritic Malleable Iron Castings. ASTM A48 — Standard Specification for Gray Iron Castings. ASTM A108 — Standard Specification for Steel Bars, Carbon, Cold-Finished, Standard Quality. ASTM A126 — Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings. ASTM A153 — Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware. ASTM A197 — Standard Specification for Cupola Malleable Iron. ASTM A220 — Standard Specification for Pearlitic Malleable Iron Castings. ASTM A242 — Standard Specification for High-Strength Low-Alloy Structural Steel. ASTM A307 — Standard Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile Strength. ASTM A395 — Standard Specification for Ferritic Ductile Iron PressureRetaining Castings for Use at Elevated Temperatures. ASTM A536 — Standard Specification for Ductile Iron Castings. ASTM A575 — Standard Specification for Steel Bars, Carbou Merchant Quality, M-Grades. ASTM A576 — Standard Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality. ASTM B 154 — Standard Test Method for Mercurous Nitrate Test for Copper and Copper Alloys. ASTM B633 — Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel. ASTM B766 — Standard Specification for Electrodeposited Coatings of Cadmium. ASTM D2000 — Standard Classification System for Rubber Products in Automotive Applications. ANSI/AWWA C 110/A21. 10 — American Natioml Standard for Ductile-Iron and Gray-Iron Fittings, 3 In. Through 48 In. (75 mm Through 1,200 mm), for Water and Other Liquids. ANSI/AWWA C11UA21. 11 — American National Standard for Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings. ANSI/AWWA C 115/A21. 15 — American National Standard for Flanged Ductile-Iron Pipe With Threaded Flanges.

*American National Standards Institute, 11 W. 42nd St., New York, NY 10036. tAvailable from Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096. $.American Society of Mechanical Engineers, 345 E. 47th St., New York, NY 10017. ~American Society for Testing and Materials, 1916 Race St., Philadelphia, PA 19103.

DRY-BARRELFIRE HYDRANTS

ANSI/AWWA C15 VA2 1.51 — American National Standard for Ductile-Iron Pipe, Centrifugally Cast, for Water or Other Liquids. ANSI/AWWA C503 — Standard for Wet-Barrel Fire Hydrants. ANSI/AWWA C550 — Standard for Protective Epoxy Interior Coatin~ For Valves and Hydrants. ANSI/AWWA C600 — Standard for Installation of Ductile-Iron Water Maina and Their Appurtenances. AWWA M17 — Installation, Field Testing, and Maintemnce of Fire Hydrants. Fed. Spec.* ‘IT’-C-494b — Coating Compound, Bituminous, Solvent Type, Acid Resistant. Federal Standard 595A — Color. NFPA~ 1963 — Standard for Fire Hose Connections. Sec. 1.4 Data to Be Supplied by the Purchaser Where special nozzle threads, nozzle caps, weather shields, are required, the purchaser shall furnish the necessary drawings manufacturer.

or operating nuts or samples to the

Sec. 1.5 Data to Be Supplied by the Manufacturer 1.5.1 Catalog and maintenance data. After purchase, the manufacturer shall, when required, furnish catalog data (including illustrations and a schedule of parts and the materials of which they are made) in sufficient detail to serve as a guide in the assembly and disassembly of the hydrant (including top and bottom extension pieces), as well as in ordering repair parts. The manufacturer shall, when required, furnish instructions and recommended frequencies for lubrication and maintenance. 1.5.2 Net weight. When required, the manufacturer shall furnish the net assembled weight of each size of hydrant ordered. 1.5.3 Drawings. When required, the manufacturer shall submit a minimum of two sets of assembly drawings showing the principal dimensions, construction details, and materials for acceptance by the purchaser. The purchaser shall return one set of drawings marked “accepted” to the manufacturer. Hydrants furnished shall be in accordance with the “accepted” drawings. Sec. 1.6 Installation References to the setting and draimge of hydrants are not included in this standard. For installation information see ANSI/AWWA C600 and AWWA Manual M17. Sec. 1.7 Affidavit of Compliance The manufacturer shall, when required by the purchaser’s specifications, furnish the purchaser with an affidavit stating that the hydrant and all material used in its construction conform to the applicable requirements of this standard and the purchaser’s specifications, and that all tests specified therein have been performed and that all test requirements have been met.

*US Government Defense Printing Service Detachment Oflke, Customer Service, Building 4D, 700 Robbins Ave., Philadelphia, PA 19111-5094. tNational Fire Protection Association, One Batterymarch Park, Quincy, MA 02269.

AWWA CN32-94

Sec. 1.8 Permeation The selection of materials is critical for water service and distribution piping in locations where there is likelihood the hydrant will be exposed to significant concentrations of pollutants comprised of low-molecular-weight petroleum products or organic solvents or their vapors. Research has documented that pipe materials such as polyethylene, polybutylene, polyvinyl chloride, and asbestos cement; and elastomers, such as used in jointing gaskets and packing glands, may be subject to permeation by lower-molecular-weight organic solvents or petroleum products. If a water pipe must pass through such a contaminated area or an area subject to contamination, consult with the manufacturer regarding permeation of pipe walls, jointing materials, etc. before selecting materials for use in that area.

SECTION 2: MATERIALS Sec. 2.1 General All materials designated hereinafter, when used in hydrants produced under this standard, shall conform to the referenced standards designated in Sec. 2.2 for each material listed.

Sec. 2.2 Physical and Chemical Properties of Components Materials shall be in conformance with the physical and chemical requirements as required in this section 2.2.1 Gray iron. Gray iron shall meet or exceed the requirements of one of the following standards: ANSI/AWWA Cl10/A21.10; ASTM A126, class B; or ASTM A48, class 30. 2.2.2 Ductile iron. Ductile iron shall meet or exceed the requirements of one of the following standards: ANSI/AWWA Cl10/A21.10, ASTM A395, ASTM A536, or ANSI/AWWA C15VA21.51. 2.2.3 Malleable iron. Malleable iron shall meet or exceed the requirements of one of the following standards: ASTM A47, ASTM A220, or ASTM A197. 2.2.4 Steel. Steel shall meet or exceed the requirements of one of the following standards: ASTM A575, ASTM A576, or ASTM A108. 2.2.5 Brass or bronze. Components of brass or bronze shall be made to ASTM

or Copper Development Association (CDA)* recognized alloy specifications. Brass or bronze shall comply with the chemical and physical requirements shown in Table 1. 2.2.5.1 Any bronze alloy used in the cold-worked condition shall be capable of passing the mercurous nitrate test in accordance with ASTM B 154 to minimize susceptibility to stress corrosion. Waters in some areas have, by experience, been shown to promote galvanic corrosion in the form of dezincification. In such waters, grade B and C bronze should not be used. 2.2.5.2 Any brass or bronze component in contact with drinking water shall not contain more than 8 percent lead.

*Copper Development Association, Greenwich OffIce Park 2, P.O. Box 1640, Greenwich, CT 06636-1840.

DRY-BARRELFIRE HYDRANTS

Table 1 Physical and chemical requirements Minimum Yield Strength Grade of Bronze I I

psi

(MPa)

Minimum Elongation in 2 in. (50.8 mm)* percent

Copper Minimum percent

zinc Maximum pement 16 unspecified unspecified 16 16

14,000

20,000

(138)

32,000 20,000 32,000

(220) (138) (220)

10 15 10

57 79 79

c D E

(96.5)

*Gauge length of sample.

SECTION 3: GENERAL AND DETAILED DESIGN Sec. 3.1

General Design 3.1.1 Working pressure. Hydrants shall be designed for a minimum working pressure of 150 psig ( 1,034 kpa [gauge]). 3.1.2 Material stress limits. All parts of the hydrant shall be designed to withstand, without being functionally impaired nor structurally damaged, a hydrostatic test of not less than 300 psig (2,068 kpa [gauge]) or twice the rated working pressure, whichever is greater, with the hydrant completely assembled and pressurized as follows: 3.1.2.1 With the nozzle caps in place, the main valve ope~ the hydrant inlet capped, and the test pressure applied to the interior of the hydrant. 3.1.2.2 With the main valve closed, the hydrant inlet capped, and the test pressure applied at the hydrant inlet. 3.1.3 Parts of bronze. The parts in which various grades of bronze are used are shown in Table 2. Reference should be made to the designated sections of this standard in which the various components are specified because, in several instances, properly treated ferrous metal may be used instead of bronze. Parts working together, however, shall not both be made of ferrous metal. 3.1.4 Parts made of gray or ductile iron. The following parts of the hydrant

may be made of either gray or ductile iron: barrel, bonnet, base, packing plate, gates and plates, and outlet-nozzle caps. Miscellaneous structural parts may be made of gray iro~ ductile iron, or malleable iron when the use of these materials will conform to good practice. 3.1.5 Operating mechanism torque limits. The design safety factor of the operating mechanism shall be not less than 5 and shall be based on the foot-pounds (Newton-metres) of torque required for the closing and opening of the hydrant at a working pressure of 150 psig (1,034 kpa [gauge]). Hydrants shall be functional and capable of being opened or closed without difllculty following application of an operating torque of 200 lbf.ft (270 N. m) at the operating nut in the opening direction with the hydrant fully opened and the closing direction with the hydrant fully closed (see Sec. 5.2.2). The torque requirements apply only to hydrants of 5-fi (1.5-m) bury or less. 3.1.6 Traffic model components. Hydrants with fi-angible sections near the ground line designed to break on impact shall, except for the fmngible components,

AWWA C502-94

Table 2

Grades of bronze used in hydrant components Component

Refer ti Section*

Drain-valve parts Packing glands Packing-gland bushings Outlet nozzles Stems or threaded portion of stems Stem nuts Stuffing boxes Valve seats or valve-seat rings

3.4.2 .1,3.4.2.3,3.4.2.4 3.5.1,3 .5.1.1 3.5.1,3 .5.1.2 3.2.3.1 3.2.5 .1,3.2.5.4 3.2.5 .1,3.2.5.4 3.6.3.2 3.4.1.3

Grade of Bronze A, A, A, A, A, A, A, A,

B, B, B, B, B, B, D B,

D, D, D D D, C,

E E

E D, E

D, E

*Referenceshouldbe made to the designatedsectionsof AWWA C502in which the variouscomponentsare specified.

conform to all structural design requirements of this standard. Frangible components will not be required to meet the structural design safety factor of 5.

Sec. 3.2 Detailed Design 3.2.1 Bonnet. The bonnet shall be free-draining and of a type that will maintain the operating mechanism in readiness for use. The bonnet shall be designed to make tampering difHcult and shall be provided with convenient means for lubricating to ensure ease of operation and the prevention of wear and corrosion. An arrow and the word “OPEN” shall be cast on or near the top of the hydrant bonnet to indicate the direction of operation and shall be clearly visible when viewed from the top. 3.2.2 Barrel sections. If hydrants are made in two or more sections with a flange or other joint near the ground line, the joint shall, unless otherwise specified in the purchaser’s specifications, be located at least 2 in. (50.8 mm) above the ground line. 3.2.2.1 The minimum thickness of the wall of the barrel and base at any point shall be as shown in Table 3. The wall thickness of barrels of fractional-inch diameters shall be that of the next larger diameter. For statically cast barrels, a minus tolerance of 0.02 in. (0.5 mm) over areas not exceeding 8 in. (203 mm) in length in any direction shall be permissible. 3.2.2.2 To meet the requirements of Sec. 5.2.1, changes in the shape or size of the waterways should be accomplished by the use of curves. The junction of hose and pumper outlet nozzles with the barrel should be rounded. Exclusive of the main valve opening, the net area of the waterway of the barrel and base at the smallest parts shall be not less than 120 percent of that of the net opening of the main valve. 3.2.3 Outlet nozzles. 3.2.3.1 Outlet nozzles shall be made of bronze and be fastened into the nozzle section by mechanical means or caulking. If caulking is used, an adequate recess shall be provided for the caulking material. All outlet nozzles shall be safeguarded against blowing out. For screwed-in outlet nozzles, a pin or other method shall be used to prevent the outlet nozzle from turning or backing out. 3.2.3.2 Outlet-nozzle caps shall be provided for all outlets. The threads shall conform to those of the outlet nozzle except that the “Higbee” cut may be omitted. A recess shall be provided at the inner end of the thread to retain a gasket unless the purchaser requests the deletion of the gasket. Unless otherwise specified in the

DRY-BARRELFIRE HYDRANTS Table 3

Minimum

Barrel ID in. (mm) 5 6 7 8 9 10

(125) (150) (175) (200) (225) (250)

wall thicknesses Statically Cast Gray Iron (mm) in. 0.35 0.36 0.40 0.43 0.50 0.56

(8.9) (9.2) (10.2) (10.9) (12.7) (14.2)

Centrifugally Cast Gray Iron in. (mm) 0.32 0.33 0.35 0.36 0.37 0.38

(8.2) (8.4) (8.9) (9.2) (9.4) (9.7)

Ductile Iron (mm) in. 0.25 0.26 0.27 0.28 0.28 0.29

(6.4) (6.6) (6.9) (7.2) (7.2) (7.4)

purchaser’s specifications, caps shall be chained securely to the hydrant barrel with a metal chain having links made from stock not less than % in. (3 mm) in diameter, or of equivalent cross-sectioml area. The caps may also be fastened to the hydrant barrel with a cable of strength equivalent to the chain. The attachment shall permit free rotation of the cap. For cap nuts, see Sec. 3.2.5.5. 3.2.4 Bwy. The length of bury is the distance measured to the nearest !42ft (152 mm) from the bottom of the connecting pipe to the ground line of the hydrant. 3.2.5 Operating Mechanism. 3.2.5.1 The operating threads of the hydrant shall be designed to avoid the working of any iron or steel parts against either iron or steel. The threaded portion of the stem or its threaded stem nut (or sleeve) shall be made of bronze. 3.2.5.2 The lead of the threads shall be such that no fewer than 8 complete turns will be required to close a 4-in. (100-mm) hydrant; 10 complete turns to close a 5-ire (125-mm) hydrant; and 12 complete turns to close a 6-in. (150-mm) hydrant. The minimum number of turns for intermediate sizes shall be that designated for the next larger size. 3.2.5.3 Uiless otherwise required by the purchaser’s specifications, the hydrant shall be opened by turning the operating nut counterclockwise. 3.2.5.4 Stem nuts shall be made of bronze if the threaded portion of the stem is made of steel. If the threaded portion of the stem is made of bronze, stem nuts may be made of brdnze or steel. 3.2.5.5 Unless otherwise required by the purchaser’s specifications, the operating nuts shall be pentagonal in shape. The pentagon shall measure 1Y2 in. (38.1 mm) from point to flat at the base of the operating nut and 1?46 in.(36.5 mm) at the top; faces shall be tapered uniformly, and the height of the operating nut shall not be less than 1 in. (25.4 mm). The point-to-flat dimension shall be measured to the theoretical point where the faces would intersect if the corners were not rounded off. When required by the purchaser’s specifications, the opening between the operating nut and the top of the bonnet shall be protected from rain or dirt by skirting the operating nut, installing a seal ring, or using other means acceptable to the manufacturer and the purchaser. 3.2.6 Damage to barrel and operating mechanism. The barrel and operating mechanism shall be designed so that in the event of accident, damage, or breaking of the hydrant above or near the ground line, the main valve will remain closed and reasonably tight against leakage.

AWWA C502-94

Sec. 3.3 Hydrant Inlet 3.3.1 Connections. The base of the hydrant shall have a side or bottom inlet provided with a hub end for a poured joint, flange, mechanical joint, push-on joint, or other type of connection, as specified in the purchaser’s specifications for connecting the hydrant to the hydrant lead from the main. The inlet shall be suitable for connection to pipe of not less than 6 in. (150 mm) in nominal diameter, unless otherwise specified in the purchaser’s specifications. When the hydrant is provided with a hub end for a poured joint, it shall conform to the dimensions shown in Table 4. When the hydrant is provided with a flange end, the flange shall conform to the dimensions shown in ANSI)AWWA Cl15/A21. 15. When the hydrant is provided with a mechanical joint or a push-on joint, the joint shall conform to the dimensions shown in AIWWAWWA C11lfA21. 11. If the hydrant is provided with a mechanical joint or flanged connections, the top one or two bolt holes in which the body interferes with the insertion of the bolts maybe slotted to the outer face of the flange. 3.3.2 Harnessing lugs. If required by the purchaser’s specifications, lugs for harnessing the hydrant to the hydrant lead shall be provided. Sec.

Valves

3.4

3.4.1 Main values. The hydrant shall be designed so that, when it is in place, no excavation is required to remove the main valve, the operating mechanism of the hydrant, or the movable parts of the drain valve. 3.4.1.1 Where removal of the main valve, the main valve seat assembly, or both requires an interface connection with gray cast or ductile iron, the nonferrous thread or connections shall be designed so that the products of corrosion will not

Table 4

Dimensions of poured joints*

ing Length

l—

Bell-and-spigot pipe, 4-8 in. (102–203 mm), with plain ends

CenteringShoulder

Size

Pipe OD~

Socket Diam. at

4.80

5.60

6 8

6.90 9.05

7.70 9.85

*To convert inches to millimetres, tolerances for outside diameter

Thickness of Joint

Socket Depth

Depth

0.40 0.40 0.40

330 3.88 4.38

0.30 0.38 0.38

4.94 7.06 9.21

multiply by 25.4. (OD) of spigot ends, scrket

shall be + 0.06 in. (1.52 mm) for sizes 4-8 in. (102–203

diameter

a, and centering

shoulder

mm).

inside diameter

(ID) f

DRY-BARREL

FIRE HYDRANTS

prevent disassembly. The interface between the ferrous and nonferrous surfaces shall be coated with antisieze material. 3.4.1.2 The main valve shall be faced with a suitable yielding material, such as rubber, elastomer, polymer, leather, balata, or other composition where the valve face bears on the seat ring. 3.4.1.3 The valve-seat ring for the main valve shall be made of bronze. 3.4.1.4 The size of the hydrant is designated by the nominal diameter of the main valve opening. The diameter of the main valve opening shall not be less than 4 in. (100 mm). 3.4.2 Barrel drain outlet. 3.4.2.1 Unless the purchased specifications require that the drain outlet be omitted, a positive-operating drain valve or valves shall be provided to drain the hydrant properly by opening as soon as the main valve is closed. The drain valve shall close when the main valve is opened. The seat of the drain valve shall be bronze or other corrosion-resistant material, fastened securely in the hydrant. The drain valve may be faced with a suitable yielding material, such as rubber, elastomer, polymer, leather, balata, or other composition, where the drain valve face bears on the seat. 3.4.2.2 The drain outlet shall be provided in the base or barrel, or between the base and barrel, of the hydrant unless the purchaserâ&#x20AC;&#x2122;s specifications require that such drain outlet be omitted. The drain outlet shall be tapped to receive a drain pipe if specified in the purchaserâ&#x20AC;&#x2122;s specifications. 3.4.2.3 The drain outlet shall be an integral part of the drain valve or shall be bushed with bronze or other corrosion-resistant material. 3.4.2.4 If the drain outlet is not an integral part of the drain valve, it shall be bushed with bronze or other corrosion-resistant material to the outside of the hydrant. Sec. 3.5

Packing Glands and Packing-Gland Bolts 3.5.1 Packing glands. Packing glands shall be made of solid bronze or bronzebushed cast iron. Glands shall be secured to prevent rotation when the operating nut is turned. 3.5.1.1 If packing glands are made of solid bronze, the bronze shall be grade A,B,D, or E. 3.5.1.2 If packing glands are made of bronze-bushed cast iro~ the bronze shall be grade A,B, or D. 3.5.2 Packing-gland bolts. Packing-gland bolts or studs shall not be less than 5/s in. (16 mm) in diameter if made of bronze, or not less than % in. (13 mm) in diameter if made of steel. Packing-gland bolt nuts shall be made of grade B, D, or E bronze.

Sec. 3.6 Seals

3.6.1 O-ring seals. O-rings shall be compounded to meet ASTM D2000 and have physical properties suitable for the application. 3.6.1.1 When an O-ring or other pressure-actuated stem seal is used, the dimensions of such seals are to be in accordance with AS-568A. Tolerances may be altered for economical manufacturing purposes provided that the seal remains watertight at pressures required by this standard. 3.6.2 Other pressure-actuated seals. Other types of pressure-actuated seals may be used if accepted by the purchaser.

;* !

AWWA C502-94

3.6.3 Stuffing-box seals. If accepted by the purchaser, stuffing-box seals may be used in place of O-ring seals. 3.6.3.1 When stufilng boxes are used, the width of the packing shall be at least ?4 in. (6.4 mm), and the depth of packing space shall be at least four times its width. 3.6.3.2 StufTingboxes shall be made of either grade A or D bronze or cast iron. 3.6.3.3 Hemp and asbestos packing shall not be used for stuflhg-box packing. 3.6.4 Gaskets. Gasket material shall be of rubber composition or paper free from corrosive ingredients, either alkaline or acid. O-rings or other suitable elastomeric seals may be used in place of gaskets.

Sec. 3.7 Bolts and Nuts Bolting materials shall develop the physical strength requirements of ASTM A307 and may have either regular, square, or hexagonal heads with dimensions conforming to ANS1/ASME B 18.2.1. Bolts, studs, and nuts shall be cadmium-plated (ASTM B766, grade NS) or zinc-coated (ASTM A153 or ASTM B633), or rust-proofed by some other process disclosed to and accepted by the purchaser. The purchaser may specify that bolts, studs, and nuts shall be made from a corrosion-resistant material, such as low-zinc bronze, Monel, stainless steel, or low-alloy steel (ASTM A242).

SECTION 4: WORKMANSHIP

AND PAINTING

Sec. 4.1 Workmanship All foundry and machine work shall be performed in accordance with good standard practice for the class of work involved and in conformance with accepted drawings, if required. When assembled, hydrants manufactured in accordance with this standard shall be well fitted and shall operate smoothly. The body and shaft seal shall be watertight. 4.1.1 Proper functioning. All parts shall conform to the required dimensions and shall be free from defects that could prevent proper functioning of the hydrant. 4.1.2 Castings. All castings shall be clean and sound without defects that will weaken their structure or impair their service. Plugging, welding, or repairing of cosmetic defects is allowed. Repairing of structural defects is not allowed unless accepted by the purchaser. Repaired hydrants shall comply with the testing requirements of this standard after repairs have been made. Repairs within the bolt circle of any flange face are not allowed. 4.1.3 Interchangeable parts. All like parts of hydrants of the same model, bury, and size, produced by the same manufacturer, shall be interchangeable.

Sec. 4.2 Painting 4.2.1 General. Unless otherwise specified by the purchaser, all ferrous metal parts of the hydrant, inside and outside, shall be thoroughly cleaned before coating. Coatings used on interior surfaces of the hydrant that are in contact with water in or flowing through the hydrant shall be suitable for contact with drinking water. Primer used in coating the hydrant shall meet or exceed the requirements of Fed. Spec. TIâ&#x20AC;&#x2122;-C-494b, or equal.

DRY-BARREL

FIRE HYDRANTS

4.2.2 Shop coating of hydrant top section. The exterior ferrous surfaces of the hydrant top section shall be painted with a coat of primer. A second coat of primer or paint of a color required by the purchaser% spectilcations shall be applied. Colors should be selected from Federal Standard 595A. 4.2.3 Exterior coating of parts below ground line. AU exterior ferrous surfaces below the ground line shall be covered with two coats of asphaltic coating, the first being allowed to dry thoroughly before the second is applied. 4.2.4 Interior coating of su~aces. All interior ferrous surfaces, except machined surfaces, such as the threaded portion of the stem or stem nut, that must fit closely with the adjacent parts, shall be coated with asphaltic coating, primer, or its eq~valent, (seesec. 4,2. l.). Whenever the purchaser’s specifkation requires a special interior coating, such as an epoxy, and unless otherwise specified, this special coating system shall conform to the requirements of AWWA C550.

SECTION 5: TESTING AND INSPECTION Sec. 5.1

Production Testing 5.1.1 General. All specified tests and inspections shall be conducted at the place of manufacture or place of assembly, or both. On delivery, an inspection shall be conducted by the purchaser, and any hydrant not meeting the requirements of this standard will be rejected. Whenever hydrant components are to be made in conformance with AWWA, ANSI, ASTM, or other standards that include test requirements or testing procedures, such requirements or procedures shall be complied with by the hydrant manufacturer. The records of all tests shall, if required by the purchaser’s specifications, be made available to the purchaser. 5.1.2 Mechanical test. Each assembled hydrant shall be operated through a full open-close cycle when not under pressure. The torque required for performing this operation shall not exceed 20 lbf”ft (27 N“m). 5.1.3 Hydrostatic test. Each assembled hydrant shall be subjected to two shop tests under a hydrostatic pressure of 300 psig (2,068kpa [gauge]) or twice the rated working pressure, whichever is greater. One test shall be made with the entire interior of the hydrant under pressure and another test made with the main valve closed and the. base under pressure fmm the inlet side. Under the test procedure, there shall be no leakage through the main valve or seals or through the castings or the joints of the assembled hydrant. Under the test conditions, the leakage through the drain valve shall not exceed 5 fl oz/min (148 mLhnin). Other leakage or other imperfections found in either test shall be corrected and the hydrant retested. The tests shall be conducted for a sufficient time to allow a check of all points of possible leakage and for a minimum of 30 s after all air has been exhausted.

Sec. 5.2 Prototype Testing 5.2.1 Hydraulic test. Hydrants used in loss-of-head tests shall not be less than 5-ft (1.5-m) bury and inlet size shall be 6 in. (150 mm). Loss of head due to friction, in pounds per square inch (kiloPascals), corrected for inlet and outlet velocity head, shall not exceed the permissible loss of head shown in Table 5. 5.2.1.1 Tests shall be made to determine that the friction losses given in Table 5 are not exceeded for the flow conditions indicated. For tests involving

AWWAC502-94

Table 5 Maximum permissible loss of head for hydrants Nominal Diam. of Outlet Nozzles (mm) in.

No. of Outlet Nozzles

1 2 3 4 1

2 2 2 2 4

V2 !4 V“ %

(64) (64) (64) (64) (100) or larger

Total Flow From OutJet Nozzles (m31h) gpm 250 500*” 750* 1,000* 1,000

Max. Permissible Head Loss psi (kPa)

(57) (114) (170) (227) (227)

1.0 2.0 3.0 4.0 5.0

(6.9) (13.8) (20.7) (27.6) (34.5)

*Approximately250 gpm (57 m3/h)from each outlet nozzle.

simultaneous discharge fmm two or more 2%-in. (64-mm) outlet nozzles, the discharge from each nozzle shall be approximately equal. 5.2.1.2 Tests shall be made by means of a differential gauge comected to a piezometer on the hydrant inlet and one or more piezometers on the outlet nozzle or nozzles, or by other methods of equal accuracy. 5.2.2 Torque test. Hydrants used in prototype torque tests shall be functional and capable of being opened or closed without difficulty following application of an operating torque of 200 lbf.ft (270 N m) at the operating nut as follows: 1. In the opening direction with the hydrant fully opened. 2. In the closing direction with the hydrant fully closed. 3. The hydrant bury is 5 ft (1.5 m) or less. ●

Sec. 5.3 Inspection and Rejection 5.3.1 Inspection. All work performed in accordance with this standard, except prototype testing, shall be subject to inspection and acceptance by the purchaser. The purchaser shall, at all times, have access to all places where materials are being produced or fabricated or where tests are being conducted, and shall be accorded fill facilities for inspection and observation of tests. 5.3.2 Basis for rejection. Any hydrant or part that does not conform to the requirements of this standard shall be made satisfactory or shall be replaced.

SECTION 6: MARKING

AND SHIPPING

Sec. 6.1 Marking All hydrants shall have permanent markings identifying the manufacturer by name, initials, insignia, or abbreviations in common usage, and designating the size of the main valve opening and the year of manufacture. Markings shall be placed to be readily discernible and legible after hydrants have been installed.

Sec 6.2 Shipping Hydrants shall be complete in all details when shipped. The manufacturer shall use due and customary care in preparing them for shipment. Hydrants must be drained and completely closed before shipment.

APPENDIXA Characteristics of National Standard Fire-Hose Coupling Screw Thread .

This appendix is for information only and is not a part of AWWA C502.

Nominal and basic dimenaiona of National (American) Standard fire-hose coupling screw threads are shown in Tables A. 1 and A.2. For tolerances and other data not shown, see NFPA 1963, Standard for Fire Hose Connections. *

Table A.1 Nominal dimensions

of standard fire-hose

Approximate Outside Diameter of External Thread

coupling screw threacls*

Length of Nipple

Length of Pilot to startof Second Thread

Depth of Coupling

Diameter of Gasket Seat in Coupling

15/16

33/16

11/1(3

3/Kj

3 3/4

1/4

1 ~llj

4 3/8

3/4

1/4

7/16

1 ?+j

5 l/8

7/8

3/5

144

7/16

1 ~llj

5 %

7/8

3/5

7/16

1 ~113

6 3/5

3/5

7/16

1716

~ !/8

3/8

Nominal Size of Coupling Waterway

Number of Threads per Inch

Thread Designation (NH = Fire Hose)

2 V“

7 4“

2.5-7.5

3416

1/4

3-6

3 %

1 %

5/16

1 Yltj

3 vi

3.5-6

4 l/4

1 %

5/lfj

4-4

1 V4

4 %

4.5-4

5 Y4

5-4

6 V4

6-4

i’ Y32

*Reproduced by permission fmm NFPA 1983. TSuctich hose couplings; these sizes are not recommended

Table A.2

Basic dimensions of standard fire-hose coupling threads’~

Nominrd Threads Thread Size of per Designation Hose Inch (NH = Coupling (Z’F’f) Fire Hose)

From Face of Coupling to Start of Second Thread

for fire hydrant opemings

Minimum Coupling Dimensions (Internal Thread)

Nipple Dimensions (External Thread)

Length of Coupling Internal Thread

2 %.

7’.5

2.5-7.5

3 3 % 4 4 % 5 6

6 6 4 4 4 4

3-6 3.5-6 4-4 4.5-4 5-4 6-4

NH NH NH NH NH NH NH

Max. Major Diam.

D-

Max. Pitch Diam. Col. 7

Max. Minor Diam. Col. 7

Allow.

–h

0.0150 0.0150 0.0200 0.0250 0.0250 0.0250 0.0250

3.0686 3.6239 4.2439 5.0109 5.7609 6.2600 7.0250

. Pitch (P)

Basic Thread Height (h)

Allowance

0.13333 0.16667 0.16667 0.25000 0.25000 0.25000 0.25000

0.08660 0.10825 0.10825 0.16238 0.16238 0.16238 0.16238

Min. Minor Diam.

Basic Pitch Diarn.

–2h

D2h

2.9820 3.5156 4.1356 4.8485 5.5985 6.0976 6.8626

2.8954 3.4073 4.0273 4.6861 5.4361 5.9352 6.7002

2.9104 3.4223 4.0473 4.7111 5.4611 5.9602 6.7252

2.9970 3.5306 4.1556 4.8735 5.6235 6.1226 6.8876

3.0836 3.6389 4.2639 5.0359 5.7859 6.2850 7.0500

Basic Major Diam.

*Reproduced by permission from NFPA 1963. tAll values are given in inches except in column 3.

*Available from National Fins Protection Association, One Batterymamh Park, Quincy, MA 02269.

APPENDIX Uniform Color Scheme

B for Fire Hydrants

This appendix is for information only and is not a part of AWWA C502.

This appendix includes a revised color scheme based on NFPA 291, Recommended Practice for Fire Flow Testing and Marking of Hydrants, 1988 edition The original color scheme was based on a proposal adopted by the American Water Works Association at its 1937 annual conference held in Buffalo, N.Y., and was originally published in Jour. AWWA, 29:4:449 (April 1937). The origiml color scheme duplicated, in essentials, similar plans adopted by the Maine Water Utilities Association in 1929; the New England Water Worka Association on Mar. 21, 1934; and NFPA on May 14, 1936. The American Water Worka Association, recognizing that the adoption of a capacity marking scheme by any water utility is optional, herewith provides the following uniform color scheme for painting hydrants rated in terms of their relative capacity.

SECTION B.1 : CLASSIFICATION Hydrants are classified as follows: Class W Hydrants that on individual test usually have a flow capacity of 1,500 gpm (5,680 IJmin) or greater. Class A Hydrants that on individual test usually have a flow capacity of 1,000 to 1,499 gpm (3,785 to 5,675 IJrnin). Class B: Hydrants that on individual test usually have a flow capacity of 500

to 999 gpm (1,900 to 3,780 I-Jmin). Class C: Hydrants that on individual test usually have a flow capacity of less than 500 gpm ( ~,900 I.Anin). Sec. B.1.l

Capacity Rating Capacities are to be rated by flow measurements of individual hydrants at a period of ordinary demand. When initial pressures are over 40 psig (275 kpa [gauge]) at the hydrant under test, the rating is to be based on 20-psig ( 138-kPa [gauge]) residual pressure, observed at the nearest hydrant connected to the same main and when no water is being drawn. When initial pressures are less than 40 psig (275 kpa [gauge]), residual pressures shall be at least half of the initial pressure.

DRY-BARREL

FIRE HYDIUNTS

SECTION B.2: COLOR SCHEME The following is the capacity-indicating color scheme. The colors shall be as designated in Federal Standard 595A.*

Sec. B.2.1 Public Hydrants All barrels are to be painted chrome yellow, except in cases where another color is desired. The tops and nozzle caps of hydrants in the classes outlined in Sec. B. 1 are to be painted as follows: Class AA — light blue Class A — green Class B — orange Class C — red These colors shall be as designated in Federal Standard 595A.

Sec. B.2.2 Private Hydrants Within private enclosures, hydrant marking is to be at the discretion of the owners. Private hydrants in public streets should be painted to distinguish them from public hydrants.

SECTION B.3:

LOCATION MARKERS

All location markers for flush hydrants should carry the same color background as stated for class indication, with such data stenciled or painted thereon as may be deemed necessary.

SECTION B.4: CAPACITY Hydrant colors shall signify only the approximate capacity of the individual hydrant as tested alone, and not its capacity when more than one hydrant in the vicinity is in use. The marking of the hydrant is not to be considered as in any way guaranteeing the capacity indicated by the color.

*Available from General Services Administration, Specification Section Room 6039, 7th and D Streets, NW, Washington, DC 20407.

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