S112 Instruction Manual

Type S112

Fisher Controls

Instruction Manual

Type S112 Gas Regulators

January 1984

Form 5230

WARNING Fisher regulators must be installed, operated, and maintained in accordance with federal, state, and local codes, rules and regulations, and Fisher instructions.

Call a gas serviceman to service the unit.

Only a qualified person must install or service the regulator.

Introduction Scope of Manual This instruction manual provides instructions and a parts list of Type S112 gas service regulators.

Description Type S112 is used to reduce intermediate gas distribution pressures down to a reduced pressure range of 3-1/2 to 28 inch wc (8.7 to 70 mbar). It has an integral high capacity internal relief valve and a cast iron lower casing.

Specifications Table 1 lists the specifications for Type S112 constructions. The following information is stamped on the regulator at the factory: type number, seat ring port diameter size, spring range, and date of manufacture.

Installation WARNING Personal injury or system damage may result if this regulator is installed, without ap-

ŠFisher Controls International, Inc., 1984; All Rights Reserved

W4184-1

Figure 1. Type S112 Gas Regulator propriate overpressure protection, where service conditions could exceed the limits shown in tables 1, 2, and 3 for a given construction. Regulator installations should be adequately protected from physical damage.

All vents should be kept open to permit free flow of gas to the atmosphere. Protect openings against entrance of rain, snow, insects, or any other foreign material that may plug the vent or vent line. On outdoor installations, point the spring case vent downward to allow condensate to drain. This minimizes the possibility of freezing and of water or other foreign materials entering the vent and interfering with proper operation.

Under enclosed conditions or indoors, escaping gas may accumulate and be an explosion hazard. In these cases, the vent should be piped away from the regulator to the outdoors.

Before installing the regulator, check for damage which might have occurred in shipment. Also check for dirt or foreign matter which may have accumulated in the regulator body or in the pipeline. Apply pipe compound to the male threads of the pipeline and install the regulator so that flow is in the direction of the arrow cast on the body. The diaphragm casing assembly can be rotated to any of four positions relative to the body.

D400002X012

If the regulator vents gas or a leak develops in the system, service to the unit may be required. Failure to correct trouble could result in a hazardous condition.

Type S112 Table 1. Specifications

BODY SIZES AND END CONNECTION STYLE

n 3/4 x 3/4, n 3/4 x 1, n 1 x 1, n 1 x 1-1/4, n 1 x 1-1/2, n 1-1/4 x 1-1/4, or n 1-1/2 x 1-1/2 in. NPT screwed

MAXIMUM ALLOWABLE INLET PRESSURES MAXIMUM EMERGENCY OUTLET PRESSURE

OUTLET PRESSURE RANGE

3-1/2 to 28 in. wc (8.7 to 70 mbar)

See table 2

SEAT RING PORT DIAMETERS

1/8, 3/16, 1/4, 5/16, 3/8, 1/2, or 9/16 x 5/8 in.

15 psig (1.0 bar) casing pressure

TEMPERATURE CAPABILITIES

– 20° to 170°F (–29° to 77°C)

PRESSURE REGISTRATION

Internal

APPROXIMATE WEIGHT

10 pounds (4.5 kg)

3 psi (0.2 bar differential) above MAXIMUM outlet pressure setting ALLOWABLE OUTLET PRESSURE Remove the two cap screws (key 18) in order to rotate the diaphragm casing assembly. Replace the cap screws and be sure the body gasket (key 19, figure 4) is still in place.

Do not install the regulator in a location where there can be excessive water accumulation, such as directly beneath a down spout or in an undrained pit.

It is advisable that the downstream piping be the same size as the regulator outlet for a minimum distance of 18 inches (457 mm) or to the meter inlet. Replace the regulator if water gets into the spring case or the lower casing of the regulator.

Type S112 regulators have a spring case vent (3/4 inch NPT female) which is screened to prevent insects or foreign material from entering. On indoor installations, the vent should be piped to the outside of the building, see figure 2. Remove the retaining ring and screen from the regulator vent connection and connect vent piping from that connection to the outdoors. Vent piping should be of as large a diameter as practicable, be as short as possible, and have a minimum number of bends and elbows. Install a weather and insect resistant vent assembly on the outside end of the pipe, such as Fisher Type Y602 series.

The same installation precautions apply to vent assemblies as the integral regulator vents covered above.

A program of regular inspection of the vent opening should be established to see that it has not become plugged by foreign material. On some installations, such as in areas of heavy snow fall, it may be necessary to install the regulator beneath a protective hood. If other protection is provided from the elements, the vent should be pointing or sloping down sufficiently to allow any condensate to drain. Also check the regulator periodically for external or internal corrosion.

Overpressure Protection

Figure 2. Typical Vent Line Installation

in tables 1, 2, and 3 may cause damage to regulator parts, leaks in the regulator, or personal injury due to bursting of pressure-containing parts or explosion of accumulated gas.

To avoid overpressure, provide appropriate overpressure protection to ensure that none of the inlet or outlet pressure limits will be exceeded. The regulator should be inspected for damage after any overpressure condition.

Startup CAUTION Pressure gauges should always be used to monitor downstream pressure during startup.

WARNING 1. Check to see that all appliances are turned off.

Some type of overpressure protection is needed if actual inlet pressure can exceed the outlet pressure rating. Overpressuring any portion of this equipment above the limits given

2

2. Slowly open the upstream plug cock.

3. Check all connections for leaks.

4. Light the appliance pilots.

Type S112 Table 2. Maximum Inlet Pressure

Adjustment

TYPE OF STEM GUIDE SEAT RING PORT DIAMETER

To increase the outlet pressure setting of the regulator, the adjusting screw (key 3, figure 4) must be turned clockwise. This In. requires removal of the closing cap (key 4).

1 /8 To reduce the outlet pressure setting, turn 3/16 the adjusting screw counterclockwise. A 1/4 pressure gauge should always be used to 5/16 monitor downstream pressure while 3/8 1/2 adjustments are being made. Do not adjust 9/16 x 5/8 the spring to produce an outlet pressure setting above the limit stamped on the closing cap. If the required pressure setting is not within the range of the spring being used, substitute with the correct spring, see table 3. When changing the spring, also change the range stamped on the closing cap to indicate the actual pressure range of the spring in use. After the spring adjustment has been completed, replace the closing cap.

Shutdown Installation arrangements may vary, but in any installation it is important that the valves be opened or closed slowly and that the outlet pressure be vented before venting inlet pressure to prevent damage caused by reverse pressurization of the regulator. The steps below apply to the typical installation as indicated.

1. Open valves downstream of the regulator.

2. Slowly close the upstream shutoff valve.

3. Inlet pressure will automatically be released downstream as the regulator opens in response to the lowered pressure on the diaphragm.

Principle of Operation Refer to figure 3. When downstream demand decreases, the pressure under the diaphragm increases. This pressure overcomes the regulator setting (which is set by a spring). Through the action of the pusher post assembly, the valve disk moves closer to the seat ring and reduces gas flow. If demand downstream increases, pressure under the diaphragm decreases. Spring force pushes the pusher post assembly downward and the valve disk moves away from the seat ring.

Type S112 regulators include an internal relief valve for overpressure protection. If the downstream pressure exceeds the regulator setting by 7 inch wc to 1 psig (17 to 69 mbar), depending on the main spring used, the relief valve opens and excess gas escapes through the vent in the upper spring case.

Standard Boost (White) T12958 T0012

Low Boost (Black) T13016 T0012

mm

Psig

Bar

Psig

Bar

3.2 4.8 6.4 7.9

125 60 20 12

8.6 4.1 1.4 0.83

125 60 60 40

8.6 4.1 4.1 2.8

9.5 12.7 14.3 x 15.9

8 5 5

0.55 0.34 0.34

_

_

Table 3. Spring Chart OUTLET PRESSURE RANGE

3/4 IN. NPT VENT

In. WC

mbar

Control Spring Part Number

Control Spring Color Code

3.5 - 5.5 3-9 6 - 7.5

8.5 - 14 7.5 - 22 15 - 17

1E9839 27052 1P7309 27022 1F1922 27052

Red Cadmium Dark Blue

5.5 - 8.5 8 - 15 14 - 28

14 - 21 20 - 38 35 - 70

1E9840 27052 1E9851 27052 1K6451 27052

Olive Drab Green Gray

damage, do not attempt any maintenance or disassembly without first isolating the regulator from system pressure and relieving all internal pressure as described in “Shutdown.�

Regulators that have been disassembled for repair must be tested for proper operation before being returned to service. Only parts manufactured by Fisher should be used for repairing Fisher regulators. Relight pilot lights according to normal startup procedures.

Due to normal wear or damage that may occur from external sources, this regulator should be inspected and maintained periodically. The frequency of inspection and replacement of parts depends upon the severity of service conditions or the requirements of local, state, and federal rules and regulations.

Disassembly to Replace Diaphragm Refer to figure 4.

1. Remove the closing cap (key 4) and adjusting screw (key 3).

Maintenance WARNING To avoid personal injury or equipment

2. Take the spring case screws (key 14) out of the spring case (key 1), and remove the spring case and spring (key 2).

3

Type S112

justing screw to about mid position. This will stretch the oversized diaphragm to ensure slack in the assembled diaphragm. The slack created by this method is necessary for good regulation. Be sure the diaphragm does not fold over at the flange when reassembling.

Disassembly to Replace Valve Disk and Seat Ring Figure 3. Type S112 Operational Schematic

1. Remove the screws (key 18) which hold the lower casing (key 9) to the body (key 21).

3. Lift the diaphragm assembly slightly, and slide it away from the lever (key 10), so that the pusher post (key 8) releases the lever.

2. The regulator can be removed from the body, exposing the disk holder assembly (key 16) and the seat ring (key 20).

4. Remove the relief valve stem (key 24) from the pusher post (key 8).

3. Examine the disk portion of the disk holder assembly.

If it is nicked, cut, or otherwise damaged, the disk holder assembly (key 16) should be unscrewed from the stem (key 10) and replaced with a new part.

5. Remove the spring seat (key 6). The diaphragm and diaphragm head assembly (key 7) can be removed and replaced with new parts.

6. Reassemble in the reverse order of the above procedures. Before tightening the screw, spring retainer, or relief valve stem into the pusher post (key 8) to secure the new diaphragm, place the loosely assembled diaphragm and head unit into position in the lower casing (key 9), being sure the pusher post is properly hooked on the lever (key 10). Rotate the diaphragm so that diaphragm and lower casing holes align. Tighten the relief valve stem (key 24) and proceed with reassembly.

CAUTION Before tightening cap screws (key 14), replace the spring and adjusting screw. Turn the ad-

4. Examine the seating edge of the seat ring (key 20).

If it is nicked or rough, it should be unscrewed from the body with a thinwall 7/8 inch socket wrench and replaced with a new seat ring to provide proper shutoff. Treat the male threads of the new seat ring with pipe compound before reassembling.

5. Reassemble in the reverse order of the above procedure.

Parts Ordering The type number, seat ring size, spring range, and date of manufacture are stamped on the closing cap. Always provide this information in any correspondence with your Fisher representative regarding replacement parts or technical assistance. If construction changes are made in the field, be sure that the closing cap is also changed to reflect the most recent construction.

4

Type S112

¨ APPLY LUB/SEAL

Figure 4. Type S112 Gas Regulator

Key

Parts List Key

Part Number

Key

1A3319 28982

21

Part Number

12

Screw, steel (2 req’d)

Spring Case, aluminum 3/4 inch vent T12185 000A2

14

Cap Screw, steel (8 req’d)

1A5797 24912

2

Spring, spring wire See table 3

15

Nut, steel (8 req’d)

1E9853 24142

3

Adjusting Screw, Delrin† T10610 X0012

16* Disk Holder & Disk

1E9857 000A2

4

Closing Cap, plastic

T20118 X0012

18

Screw, steel (2 req’d)

1E9855 28992

6

Spring Seat, steel

1E9833 25062

19

Gasket, asbestos

T10199 06992

7*

Diaphragm & Head Assembly

T13035 T0012

20

Seat Ring, aluminum 1/8 inch 3/16 inch 1/4 inch 5/16 inch 3/8 inch 1/2 inch 9/16 x 5/8 inch

1A9367 009912 0B0420 0B0421 0B0422 1A9288 1E9852

1

Description

Description

8

Pusher Post, aluminum 2E9817 08012

9

Lower Casing, cast iron T40408 T0012

10

Stem & Valve Lever Assembly

T13241 T0012

* Recommended Spare Part. † Trademark E.I. DuPont

5

09012 09012 09012 09012 09012 09012 09022

Description

Part Number

Body, cast iron 3/4 inch 3/4 x 1 inch 1 inch 1 x 1-1/4 inch 1 x 1-1/2 inch 1-1/4 inch 1-1/2 inch

1E9871 1E9872 1E9873 1E9874 1E9876 1E9875 1E9878

22

Vent Screen, SST

1B6335 38392

23

Snap Ring, steel

T10669 24152

24

Relief Valve Stem, steel 1E9835 24132

25

Relief Valve Spring

1E9834 27012

41

Union Ring, aluminum

T13038 T0012

74

Stem Guide, Delrin† Standard (white) Low Boost (black)

T12958 T0012 T13016 T0012

75

Apply Never Seez

77

Apply rubber cement

19012 19012 19012 19012 19012 19012 19012

Type S112

Limited One-Year Warranty Fisher warrants the product identified hereon to be free from defects in material and workmanship under normal use and service. If, within one year from the date the product is shipped from the factory, any part fails because of a manufacturing defect Fisher will provide a free replacement part for any defective or malfunctioning part, FOB McKinney, Texas.

This warranty applies only when the product is used for consumer use within the United States and is installed and used in accordance with all applicable national, state and local codes, regulations and laws.

The owner's responsibility is for normal maintenance, servicer's travel and labor charges.

While this information is presented in good faith and believed to be accurate, Fisher Controls does not guarantee satisfactory results from reliance upon such information. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding the performance, merchantability, fitness

Fisher Controls

This warranty shall not apply if the product has been subjected to unreasonable use, negligence, accident in transit, alteration, improper installation or misapplication.

Fisher shall not be liable for any default or delay in performance under this warranty caused by any contingency beyond its control, including without limitation, war, government restrictions or restraint, strikes, fire, flood, or a short or reduced supply of raw material.

There is no express warranties other than set forth above. All implied warranties, including the implied warranties of merchantability and fitness for a particular purpose, are limited to the duration of the express warranties set forth above. Liability for consequential damages under this warranty is excluded to the extent exclusion is permitted by law.

or any other matter with respect to the products, nor as a recommendation to use any product or process in conflict with any patent. Fisher Controls reserves the right, without notice, to alter or improve the designs or specifications of the products described herein.

For information, contact Fisher Controls: Marshalltown, Iowa 50158 USA Cernay 68700 France

Sao Paulo 05424 Brazil Singapore 0512 Printed in USA