Pressure Vessel Chart August 2011

Epoxies • Metallizing • Fibreglass Linings • Plural Spray Pipe • Tanks • Vessels • Towers • Valves 6150 - 76 Avenue, Edmonton, AB T6B 0A6

Chart | AUGUST 2011

Phone (780) 440-2855 Fax (780) 440-1050

Slip-on flange, UG-11, 44 Bolted flange connections, UG-44, Appx. 2 and Y Spherically dished covers, UG-11, 35, UCI-35, UCD-35, Appx. 1-6 Full-faced gasket, Appx. 1-6 Cat. “C” welded joint, UW-2, 3, 11, 16, UNF-19, UHT-17, ULW-17, ULT-17

Protective devices, UG-125 to 136 incl., Appx. 11, Appx. M

Openings, UG-36 to 42, ULW-16, 18, Appx. 1-7, L-7

Lap joint & loose type flange, UG-11, 44, Appx. 2, Appx. S, Y

Saddle-type nozzle, cat. “D,” UW-2, 3, 11, 16, UHT-17, 18

Ellipsoidal heads, UG-16, 81, UCS-79 Internal pres., UG-32, UHT-32, Appx. 1, Appx. L-1 External pres., UG-33, UHT-33, Appx. L-6 Head skirt, UG-32, UG-33, UW-13

Non-pressure parts, UG-4, 22, 54, 55, 82, UW-27, 28, 29, UHT-85, ULW-22, ULT-30 Hemispherical head, UG-16, 81, UCS-79, UHT-34 Internal pres., UG-32, UHT-32, Appx. 1 External pres., UG-33, UHA-31, UHT-33, Appx. L

Multiple openings, UG-42, 53

Inside edges, UG-76

-29

Forming, UG-79, 96, UF-28, UCS-79, UNF-77, UHT-79, ULT-79

F ,U

-81

e nc

a ler

Attachment details, UW-9, 13, 33, UHT-20, ULW-17, ULT-17

Unequal thickness, UW-9, 13, 33, 42, UHT-34 Shell thickness, UG-16, UCS-27 Internal pres., UG-27, Appx. 1, L External pres., UG-28, UCS-28, UNF-28, UHA-28, UCI-28, UCD-28, UHT-27, ULW-16, Appx. L

Nuts & washers, UG-13, UCS-11, UNF-13, UHA-13, Appx. 2-2

Material and Heat Treatment Table UG-5, 10, 16, 76, 79, UW-9, UCS-6, UNF-6 Plate Forgings UG-6, 11, Part UF, UCS-7, UNF-7 Castings UG-7, 11, 24, UCS-8, UNF-8, UHA-8,

Studs & bolts, UG-12, UCS-10, UNF-12, UHA-12, UCI-12, UCD-12, Appx. 2-2, Appx. 24

Stiffening rings, UG-29, 30, UCS-29, 30, UNF-30, UHA-29, 30, UHT-28, 29, 30, Appx. L

Corrosion, UG-16, UG-25, UF-25, NF-13, UHA-6, UCL-25, UHT-25, Appx. E Plug welds, UW-17, UW-37

P-9

Nickel-Alloyed (for toughness considerations at low temperatures)

Low Alloy (3/4% Chrome)

P-10

Broad Range of Materials; Mainly Oxidation Resistant

P-4

Low Alloy (2% Chrome)

P-11

9% Nickel - Cryogenic Service Considerations and High Tensile Strength (115,000 PSI)

P-5A

Alloy 2.25 to 3% Chrome

P-21 – P-23

Aluminum and Aluminum-Based Alloys

P-5B

Alloy 5 to 9% Chrome

P-31 – P-35

Copper and Copper-Based Alloys

P-5C

Alloy 2.25% Chrome; 1/2% Molybdenum

P-41 – P-46

Nickel and Nickel-Based Alloys

P-6

High Alloy - Martensitic Stainless Steel

P-51 – P-52

Titanium and Titanium-Based Alloys

P-7

High Alloy - Ferritic Stainless Steel

P-61 – P-62

Zirconium and Zirconium-Based Alloys

Acceptable (Fig. 328.5.2c) – In this sketch, the welder fully engaged the female pipe end and then extracted it approximately 1/16 inch to allow for the pipe end expansion during welding and to prevent fillet cracking.

B Preheat Requirements – ASME B31.3 – 330 & Table 330.1.1 P#

Parameter (Tensile Strength, Thickness and Carbon Content)

Minimum Temperature for Canadian Climates

All P#s

All Cases > 1 inch (25.0 mm), or All Carbon Steels with a Tensile Strength of greater than 71 ksi (490 MPa)

50˚F (10˚C)

Unacceptable – If the gap is zero prior to welding, cracking at the fillet could occur due to the high heat of the molten weld puddle during welding. The pipe end will expand onto the socket seating surface, causing excessive stresses potentially leading to fillet weld cracking.

175˚F (80˚C)

P-3

Specified Minimum Tensile Strength > 71,000 psi (490 MPa) and/or > 1/2 inch (13.0 mm)

175˚F (80˚C)

P-4

All Cases

300˚F (149˚C)

P-5A, P-5B and P-5C

All Cases

350˚F (177˚C)

P-6

All Cases

300˚F (149˚C) with a Maximum Interpass Temperature of 600˚F (316˚C)

P-7 P-8 P-9A P-9B P-10

All Cases All Cases All Cases All Cases All Cases

P-10I

All Cases

P21 – P52 PIIA – SG1 PIIA – SG2

All Cases All Cases All Cases

Welded flat heads, UG-34, UW-13, ULW-17 Corner joints, UG-93, UW-9, 13, 18

Junction weld, UW-9

Structural attachments, UG-5, 22, 54, 82, UHT-28, 85, ULW-22, ULT-30, Appx. G

Cat. “B” circumferential joints, UW-2, 3, 9, 12, 33, 35, UHT-17, 20, ULW-17, ULT-17, UNF-19, UHA-21, UCS-19 Cat. “A” longitudinal joint, UW-2, 3, 9, 12, 33, 35, UCS-19, UNF-19, UHA-21, UHT-17, 20, ULW-17, ULT-17

Bellows-type expansion joints, Appx. 26

If the joint has no gap after welding, this is typically not a problem since the differential temperatures between the socket fitting and the mating pipe would not be significantly different to cause a problem. The only possible problem that could occur is if the socket fitting and the pipe are of dissimilar metals with widely differing coefficients of expansion.

Lot Number

X X

Grade

Type

Class

Backing strip, UW-2, TABLE, UW-12, 16, 35

Kind of Pipe/Tube Weld: Furnace Butt Weld, Seamless or Electric Resistance Weld

Length

Offset type attachment (joggle joint) containing a long seam, UW-13(b) Cat. “C” welded joint, UW-2, 3, 11

Staybolts, UG-14, 47-50, 83, UW-19

Schedule Number

Tapered Fit to Match Alignment Tolerance – Fig. 328.4.3

Nameplate Nameplate Nameplate Nameplate Both Body and Nameplate Nameplate

Thicker pipe trimmed to 30 degrees maximum.

Tapered Fit to Match Alignment Tolerance

Nameplate Nameplate Rim of the end of the End Flange On Body Nameplate Both Body and Nameplate

Fluid Service

Design

Material

RT, UT

MT or PT

Category D

Least stringent

Not required

Required

Not required

Category M Chap. VIII

More stringent requirements

More stringent

20%

Not required

100%

Required

Normal requirements

General requirements

Not required

5% see note (4)

Required

High pressure Chap. IX

Most stringent

100%

See note (1)

100%

Required

Severe cyclic *See 302.3.5 for reduction factor, f

Must consider cycles, N and stress reduction factor, f

More stringent

100%

See note (2)

100%

Required

Letter Designation: from material specification for alloy type

Weld Metal Analysis A-Number

P-1

P-3

2, 11

Tube to tube sheets joints, UW-13, 18, 37, Appx. A

P-6

Conical shell reducer, UG-32, 33, 36, UHT-19, Appx. 1-5

DESIGN AND MANUFACTURE:

Conical heads, UHT-19 Internal pres., UG-32, UHT-32, Appx. 1-4, 5 External pres., UG-33, UHT-33, Appx. L-6

Optional type flange, UG-14, 44, UW-13, Appx. 2, S, Y ASME sec. VIII div. 1 pressure vessels CWB Certified ASME B31.1 & B31.3 pressure piping National Board Certified Field maintenance and construction ASME “U” Certified Manufacturer Module Construction

Small welded fittings, UG-43, UW-15, 16

Metal Temperature Range

Bolted flange, ring gasket, Appx. 2, Y

Head attachment, UW-12, 13, UHT-34, ULW-17

1.866.962.0103

Fillet welds, UW-9, 12, 13, 18, 36, UCL-46 Knuckle radius, UG-32, UCS-79, Appx. 1-4

Flued openings, UG-32, 38, 46 Yoke, UG-11

“Quality & Service is the heart of our business”

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Torispherical head, UG-16, 81 Internal pres., UG-32, UHT-32, Appx. 1-4 External pres., UG-33, UHT-33 Inspection openings, UG-46

Pressure Vessel Edmonton: 6111 - 91 Street NW, T6E 6V6 Phone: 780.944.9333 Fax: 780.944.9500 Toll Free: 1.800.563.2946

“NH” Not Hydrotested

“S” Compliance with Supplemental Requirements

“QT” Quench and Tempered

Calgary: 2nd Floor, 816 - 55 Avenue NE, T2E 6Y4 Phone: 403.209.3500 Fax: 403.245.8666 Toll Free: 1.800.387.2446

Our largest product is the value we pass on to our customers.

Manufacturer’s Test “ID” No. on Each Test Specimen

Charpy Impacts - ID on a Raised Pad

X X

Wouldn’t you rather have one supplier to meet all of your Custom Steel Fabrication and Plant Maintenance requirements?

Control Number

Classification Number

Edmonton Exchanger features a wide range of products and services for applications in various industries that include oil and gas, petrochemical and power generation.

X X

“G” Specimens Heat Treated at Producing Mill; plate to be heat treated at a later date by the purchaser

Our custom steel forming division specializes in the fabrication of large-scale pressure vessel components, and features steel forming capacities that are some of the largest of their kind. We also provide on-site plant maintenance services for refineries, fertilizer plants and the petrochemical industry. Our services range from controlled bolting and portable field machining, to complete turn-key plant and refinery shutdown projects.

Threaded Connections • Design - 314 • Assembly - 335.3 Unacceptable In the above, the fillet has not adequately covered all exposed threads, increasing stresses at the weld to thread area.

Acceptable In the above, the fillet weld has covered all exposed threads.

www.edmontonexchanger.com

Base Metal Thickness (inches)

Maximum Allowable Reinforcement (inches)

Up to _ inclusive Over _ to 1 inch inclusive Over 1 inch to 2 inclusive Over 2 inch

1/16 3/32 1/16 5/32

Longitudinal Weld Joint Quality Factor • Table 302.3.4

Intrados

Applicability

Hold Time hrs/in (min/mm)

Minimum Hold Time, hrs

Brinell Hardness, Maximum

Not mandatory if nominal thickness ≤ 3/4 inch (19.0 mm); otherwise applicable.

1100 to 1200˚F (593 to 649˚C)

1, (2.4)

200 (recommended only)

Not mandatory if nominal thickness ≤ 3/4 inch (19.0 mm); and the Tensile Strength of the material is ≤ 490 MPa (71 ksi); otherwise applicable.

1100 to 1325˚F (593 to 718˚C)

1, (2.4)

225

Extrados Bolting – 309, F309

Flange Facings – 308.3 1300 to 1375˚F (704 to 746˚C)

1, (2.4)

225

Not mandatory if nominal thickness ≤ 1/2 inch (12.7 mm); and ≤ 3% Cr and ≤ 0.15% C. Mandatory in all cases when > 3% Cr or > 0.15% C; otherwise applicable.

1300 to 1400˚F (704 to 760˚C)

1, (2.4)

241

All cases are applicable.

1350 to 1450˚F (732 to 788˚C)

1, (2.4)

241

P-7

PWHT is not required.

N/A

—

P-8

8, 9

PWHT is not required.

N/A

—

P-9A, P-9B

Not mandatory if nominal thickness ≤ 3/4 inch (19.0 mm); otherwise applicable.

1100 to 1175˚F (593 to 635˚C)

1/2, (1.2)

—

P-10

—

All cases are applicable.

1400 to 1500˚F (760 to 816˚C)

1/2, (1.2)

1/2

—

4, 5

Welded Joint – 311 • Procedure Qualifications – 328.2.1, 328.2.2 • Performance Qualifications – 328.2.1, 328.2.3 • Preparation for Welding – 328.4 • End Preparation – 328.4.2 • Alignment – 328.4.3 • Welding Requirements – 328.5 • Weld Repair – 328.6 • Weld Preheating – 330, Table 330.1.1 • Weld Heat Treatment – 331, Table 331.1.1 • Hardness Testing – 331.1.7 • Nondestructive Examination – 341 to 344 • Pressure Testing – 345 • Record – 346

Materials • Piping – 305 • Fittings – 306 • Listed Materials – 323.1.1 • Unknown Materials – 323.1.2 • Reclaimed Materials – 321.4 • Temperature Limitations – 323.2 • Component Standards – 326 • Basic Allowable Stresses – Table A-1 • Design Stress Values Bolting Materials – Table A-2

Pipe Bends – 304.2.1, 306.2, Fig. 319.4.4A • Bending & Forming – 332 • Flattening – 332.2.1 • Temperature – 332.2.2

Holding Time versus Thickness

Reference Table

Gaskets – 308.4 – F308.4 Branch Connections Design – 304.1, Appendix 14 • Preparation – Fig. 328.4.4, Fig. 328.5.2A • Welding – Fig. 328.5.4, Fig. 328.5.4D

Flanges • General – 304.5.1 • Blind Flanges – 304.5.2 • Specific Requirements – 308.2, F308.2 • Flanged Joints – 312, F312, 335.2 • Flange Welds – Fig. 328.5.2B

Typical SMAW Tack Welds Including Bridge Tacks – .5.1 (c)

Wall Thickness of Weld Caps – 304.4

End View

Pipe Wall Thickness – 304.1.1, 304.1.2 • For Internal Pressure – 304.1.1, 304.1.2 • For External Pressure – 304.1.3

Side View

Feathered-Edge

(b) In the sketch above, the welder has ground the tacks to a “feather edge.” The welder, when completing the root pass, can now weld onto the tack and break the arc on the tack and provide a correct tie-in.

(a) The above depicts a typical tack weld (end view and side view) to a single-vee groove weld. If the weld is not prepared for the root pass, weld defects can occur.

Typical for a “Set In” Branch Connection – Fig. 328.4.4 (c)

Nominal Pressure Class (ISO)

Maximum Cold Working Pressure Rating (kPa)

ANSI Class Designation

PN 20

1900

150

PN 50

4960

300

PN 68

6620

400

PN 100

9930

600

PN 150

14890

900

PN 250

24820

1500

PN 420

41370

2500

g – root gap and is typically 1/8, 1/32 inch.

Welds must be full penetration

g m

1. “PN” is “pressure nominal.” The PN system of nominal pressure class designation is contained in the standards prepared by the International Organization for Standardization (ISO). The numerical part of the designation is approximately the maximum cold working pressure rating in bars (100 kPa). 2. ANSI Class designations are designations given to valves and fittings to indicate the manufacturing dimensions and maximum allowable non-shock working pressure considering the material used and the operating pressure and temperature.

The protrusion of the connection through the pipe run cannot be less than zero, meaning that the connection must fully penetrate through the run pipe. If not, the weld strength can be affected due to the loss of deposited weld metal.

Notes:

Threaded openings, UG-36, 43, 46

Manhole cover plate, UG-11, 34, 46

Not mandatory if nominal thickness ≤ 1/2 inch (12.7 mm); and the Tensile Strength of the material is ≤ 490 MPa (71 ksi); otherwise applicable.

One-half Apex angle, UG-32, 33, UW-3, Appx. 1-5

Flange attachment, UW-2, 15, 16, ULW-18

X X

Definitions: RT - Radiography MT – Magnetic Particle Examination PT – Penetrant Examination LT - Leak Testing VT – Visual Examination

Reinforcing ring for conical reducers, Appx. 1-5, 8

Studded connections, UG-12, 43, 44, UW-16

“MT” Heat Treated at Producing Mill

Cross-Referencing ISO Rating versus Cold Pressure and ANSI Class Designation

Support skirt, UG-5, 22, 54, UHT-85, ULW-22, ULT-30, Appx. G

Line Under Symbol if Strain Hardened

Notes: 1. Although MT or PT is not required for the piping the nozzles are expected to be of radiographic quality. 2. MT or PT is required on any branch connections not radiographed and on socket welds. 3. In-process examination as per B31.3 paragraph 344.7 can be used to replace radiography and ultrasonic examination for category M, N and SC but NOT for K. 4. Visual examination is also required on a random basis at receiving and during fabrication and erection.

P-5A, P-5B and P-5C

Telltale hole, UG-25, UW-15, UCL-25

Thinner pipe tapered to the thicker pipe by providing a taper weld inside the pipe diameter.

Category

Tube sheet design, Appx. AA, U-2(g), TEMA, BS 5500

Weld neck & integral type flange, UG-11, 44, Appx. 2, S

Seal Welding Practice • Design – 311.2.7 • Welding – 328.5.3

1/16 inch (1.6 mm)

Fluid Services – 300.2 Definitions

Category “D” welded joint, UW-2, 3, 11, 16, 18, UHT-17, 18 Tolerance, UG-80, UF-27, Appx. L-4

X X

Process of Manufacture

Location of Markings Nameplate Both Body and Nameplate Both Body and Nameplate

“W” Weld Repair

Unacceptable – In sketch C, the gap is excessive and in this case there is insufficient pipe penetration in the socket fitting to provide the required strength to the joint, especially in the case of bending loads. The welding profile is not affected, but the joint may not meet design requirements.

Weld Reinforcement Requirements – ASME B31.3 – Process Piping

P-4

Tubes, UG-8, 16, 27, 28, 31, UCS-9

Markings 1 Standard Designation 2 Manufacturer’s Name or Trademark 3 Manufacturer’s Identifying Reference for the Valve Design such as a Figure Number or a Catalogue Number 4 ANSI Class Rating and/or Nominal Pressure Class 5 Impact Test Temperature 6 Maximum Cold Working Pressure 7 Limiting Maximum Temperature, if less than 120˚C 8 Body Material Standard or Specification. Melt Identification if made of Alloy Steel 9 Trim Identification. Symbols indicating the Material of the Stem and Sealing Faces of the Closure Members if different from the Valve Body (see MSS-SP-25) 10 Valves for Sour Service are Marked “SOUR” 11 Nominal Valve Size 12 Ring-joint Designation if Applicable. The letter “R” and a number indicating the ring size 13 Flow Direction (for unidirectional valves such as check and globe valves) 14 Where required, mark 6D4 and the appropriate face-to-face or end-to-end dimension 15 Serial Number

Blind flange & flat head bolted, UG-11, 34, 44

Baffle, UG-5

Stayed surfaces, UG-27, 47

Designation of Service Rating

Sour Service (marked usually as “SS”)

Internal structures, UG-5, Appx. D

Bars, structural shapes & stays, UG-14, UW-19

Size

Postweld Heat Treatment Requirements – 331 & Table 331.1.1, F331.1

Welded stayed construction, UG-47, UW-19, 37

#5, 53016 Highway 60, Acheson, AB T7X 5A7 Ph: (780) 962-0103 Fax: (780) 962-2404 www.provmfg.ca

“WR” Weld Repair

50˚F (10˚C) 50˚F (10˚C) 250˚F (120˚C) 300˚F (150˚C) 300 - 400˚F (149 - 204˚C) 300˚F (149˚C) with a Maximum Interpass Temperature of 450˚F (230˚C) 50˚F (10˚C) 50˚F (10˚C) 50˚F (10˚C)

X X

Specification Number

Serial Number

Weight

Jacketed vessel closure ring, Appx. 9

Telltale holes for corrosion, UG-25, UCL-25, ULW-76

Blanks – 304.5.3

Reinforcement of openings, with pad, UG-36, 37, 40, 41, 42, 82, UW-14, 15, 16, UHT-18, ULW-18, Appx. 1-7, L-7

Jacketed vessels, UG-27, 28, 47, ULW-22, Appx. 9

Heat and/or Slab

Valve Marking Requirements • Design - 307 • Materials – 323 & 325 • Others – F307

Opening in flat heads, UG-39

Openings in or adjacent to welds, UG-36, UW-14, ULT-18

Name of Brand or Manufacturer

Marking Information

Welding Materials

Wrought Iron

P-3

Product Form

Methods of Marking: Die Stamp, Stencil, Forge, Cast, Rolling, Tagging

Nuts

P-2

Socket Welding • Design – 311.2.5 • Welding – 328.5.2

Bolting

High Alloy - Austenitic Stainless Steel

Castings

P-8

Forgings

Carbon Steel

Material Identification Requirements

Tubes

P-1

Side plates, rectangular vessels, UW-13, Appx. 13

Stiffener plate, UG-5, 22, 54, 82

EMAIL - sales@maxfield.ca

Typical Composition

Welded connection, UW-15, 16, UHT-17, 18, ULW-18, ULT-17, 18

Part UCI, Part 400, Appx. 7 Pipes & Tubes UG-8, 10, 16, 31, UCS-9, 27 Heat Treatment UG-11, 85, UW-10, 40, 49, UCS-56, 85, UNF-56, UHA-32, 105, UCL-34, UF-31, 52, UHT-56, 80, 81, ULW-26, ULT-56

Applied linings, integrally clad plate, UG-26, part UCL, Appx. F

SASKATOON - 306.242.8900

Cat. “B” welded joint, UW-2, 3, 11

Nozzle neck, UG-11, 16, 43, 45, UW-13, 16, UHT-18, ULW-18

CROSSFIELD - 403.946.5678

Typical Composition

P-1

W 100% Canadian Owned W www.brotherscoating.com

CALGARY - 403.258.3680

Material Identification Requirements – 323, 326

P-Numbers P#

Pipe

Specialists in internal & external coating applications

Pressure Vessel

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Pressure Vessel Chart – August 2011

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Pressure Piping

Code Reference: ASME B31.3 - Figure 382.4.4. No such reference in ASME B31.1. By code: m = 1/8 inch or 0.5 Tb, whichever is less. Tb = nominal thickness of the branch connection. Example branch connection is NPS 4 Schedule 80. Tb = 0.337 inches. 0.5(0.337) = 0.1685. Since 0.1685 is greater than 0.125 inches, m = 0.125 inches in this case. However, if NPS 4 Schedule 40 is used where Tb = 0.237 inches. 0.5(0.237) = 0.11845 inches. Therefore m = 3/32 inches. The root spacing is defined as “g,” which is specified in the Welding Procedure Specification. Typical is 1/8, 1/32 inch.

(c) In the above sketch, the welder has deposited a “bridge tack.” The joint has been “fitted” with a temporary tack. The welder, as he (or she) completes the root pass, grinds out the bridge tack before completing the root pass over the area. Bridge tacks must be removed since they usually exhibit incomplete penetration.

Assembly & Erection

ASME B31.3 does not specify a maximum protrusion from a design point of view. The protrusion is not relevant (providing it is greater than zero). However, excessive protrusion can affect fluid flow and contribute to erosion and corrosion at the site of the protrusion. Therefore, specifying m as follows is realistic:

m = +1/16 -0

B31.3 – Acceptance Criteria –Circumferential Welds Based on Visual Examination B31.3 – Normal

B31.3 – Severe

B31.3 – Category D

Crack

Zero allowed

Lack of Fusion

Zero allowed

Incomplete Penetration

Lesser of 1 mm (1/32 in) or 0.2Tw 38 mm (1.5 in) in any 150 mm (6 in) of weld

Zero allowed

Lesser of 1 mm (1/32 in) or 0.2Tw 38 mm (1.5 in) in any 150 mm (6 in) of weld

Undercutting

Lesser of 1 mm (1/32 in) or Tw/4

Zero allowed

Lesser of 1 mm (1/32 in) or Tw/4

Surface Porosity

Zero allowed

Exposed Slag Inclusions

Zero allowed

Valves – 307, F307

Concave Root Surface

Not less than total joint thickness, Tw, including allowable reinforcement.

Remarks: Tw is the nominal wall thickness

X X

Alignment – 335 • Piping Distortion – 335.1(a) • Cold Spring – 335.1(b) • Flanged Joints – 335.1(c)

X X XX

• Design – 308.2.1 • Fabrication – Fig. 328.5.2B, 335.1(c), 335.2

X min.

Thickness of pipe or 1/4 inch, whichever is less

Above flanges have been backwelded. Xmin. is 1.4 of the thickness of the pipe or the thickness of the hub, whichever is smaller.

X min.

Expansion Joints – 304.7.4, F304.7.4

Tees – 304.3.1(a)(1)

Slip-On Flanges

Thickness of pipe or 1/4 inch, whichever is less

X X

Elbows – 304.2.2

Inspection – 341.4.1, 341.4.2, 341.4.3 Discontinuity

No backweld completed

Above flange has not been backwelded. This is for special cases only and needs to be approved by the designer.

If you would like additional copies of this chart or have questions/comments, please call 1.800.563.2946 or email mapping@junewarren-nickles.com. Every precaution has been taken to prevent errors or omissions and the publisher assumes no responsibility for damages caused by any errors or omissions.

Piping Support – 321, F321 • Materials – 321.1.4 • Fixtures – 321.2 • Attachments – 321.3 • Connections – 321.4 • Inspection – 341.4.1(a)(5)

X Concentric Reducer – 304.6 Discharge Piping – 322.6.2

Pressure Relieving Systems – 301.2.2, 322.6

Stop Valves in Pressure Relief Piping – 322.6.1, F322.6

X min. Piping Flexibility – 319 • Cold Spring – 319.2.4

Pressure Relief Piping & Stop Valves – F322.6