Type S301 & S302 Gas Regulators - KFNGS

1 Fisher Controls 1981 Fisher ControlsInstruction ManualType S301 & s302 Gas RegulatorsOctober 1981 Form 5180 Type S301 and S302D400004X012 Figure 1. Typical S301 Series RegulatorINTRODUCTIONINSTALLATIONF isher Regulators must be installed, operated,and maintained in accordance with federal,state, and local codes, rules and regulations,and Fisher instructions. For LP-gas service,an approved regulator (such as one listed ) should be used. The installation, in moststates, must comply with NFPA the regulator vents gas or a leak developsin the system, service to the unit may be re-quired.

2 Failure to correct trouble could resultin a hazardous a gas serviceman to service the unit. Onlya qualified person must install or service of ManualThis instruction manual provides instructions and a partslist for types S301, S301H, s302 , and S302H gas S301 series Regulators are typically installed onindustrial and commerical applications. The s302 andS302H units contain an internal relief valve. Units withan H suffix are similar to the basic Regulators but delivera higher outlet pressure (1 to 8 psig).SpecificationsTable 1 lists the specifications for the Regulators .

3 Thefollowing information is stamped on the regulator at thefactory: type number, date of manufacture, spring range,and seat ring port injury or system damage may resultif this regulator is installed, without appropri-ate overpressure protection, where service con-ditions could exceed the limits shown in tables1-4 for a given construction. Regulator instal-lations should be adequately protected fromphysical vents should be kept open to permit freeflow of gas to the atmosphere. Protect open-ings against entrance of rain, snow, insects, orany other foreign material that may plug thevent or vent line.

4 On outdoor installations, pointthe spring case vent downward to allow con-densate to drain. This minimizes the possibil-ity of freezing and of water or other foreignmaterials entering the vent and interfering withproper S301 and S3022 STARTUPBODY SIZES ANDNPT screwed inlet and outletEND CONNECTION1-1/4 x 1-1/4 inch n 1-1/2 x 1-1/2 STYLE inch n 2 x 2 inch,2 inch ANSI 125 lb. R. F. flangeMAXIMUMSee table 2 ALLOWABLE INLETPRESSURESMAXIMUM15 psig (Spring case pressure)EMERGENCYOUTLET PRESSUREMAXIMUM3 psi above outlet settingALLOWABLEOUTLET PRESSURESEAT RING5/32 x 3/16, 3/16,DIAMETERS7/32 x 1/4, 1/4,7/32 x 3/8, 3/8, 1/2,3/4, and 3/4 x 7/8 inchesTEMPERATURE-20 to +170 F (-29 to 77 C)CAPABILITIESPRESSUREI nternalREGISTRATIONAPPROXIMATE9 pounds ( kg)WEIGHTU nder enclosed conditions or indoors, escap-ing gas may accumulate and be an explosionhazard.

5 In these cases, the vent should bepiped away from the regulator to the most Regulators , S301 series regulatorshave an outlet pressure rating lower than theirinlet pressure rating. If actual inlet pressure canexceed the outlet pressure rating, outlet over-pressure protection is necessary. However,overpressuring any portion of the regulatorsbeyond the limits in tables 2 and 3 may causeleakage, damage to regulator parts, or personalinjury due to bursting of type of external overpressure protectionshould be provided if inlet pressure will be highenough to damage downstream methods of external overpressureprotection include relief valves, monitoringregulators, shutoff devices, and series regulator is exposed to an overpressure con-dition.

6 It should be inspected for any damagethat may have occurred. Regulator operationbelow these limits does not preclude the pos-sibility of damage from external sources or fromdebris in the installing the regulator, check for damage whichmight have occurred in shipment. Also check for dirt orforeign matter which may have accumulated in the regulatorbody or in the pipeline. Apply pipe compound to the malethreads of the pipeline and install the regulator so thatflow is in the direction of the arrow cast on the body.

7 Thediaphragm casing assembly can be rotated to any positionrelative to the body. Loosen the two cap screws (key 28,figure 3) in order to rotate the diaphragm casing not install the regulator in a location where there canbe excessive water accumulation, such as directly beneatha down the regulator is used in conjunction with a 289H reliefvalve, the Type 289H should be set 10" higher thanthe outlet pressure setting of the regulator, up to 30 reduced pressure. For pressure greater than this,set the 289H 3/4 psi higher than the outlet pressuresetting of the Type S301 and s302 Regulators have 1-inch NPTscreened vent openings in the spring case.

8 If necessaryto vent escaping gas away from the regulator, install aremote vent line in the spring case tapping. Vent pipingshould be as short and direct as possible with a minimumnumber of bends and elbows. The remote vent line shouldhave the largest practical diameter. Vent piping onregulators with internal relief ( s302 & S302H) must belarge enough to vent all relief valve discharge toatmosphere without excessive back pressure and resultingexcessive pressure in the check all vent openings to be sure that theyare not outlet pressure settings are shown in table pressure more than 3 psi above the set point maydamage internal parts such as the diaphragm head andvalve disk.

9 The maximum emergency (casing) outletpressure is 15 gauges should always be used to monitordownstream pressure during Check to see that all appliances are turned Slowly open the upstream plug Check all connections for Light the appliance 1. SpecificationsType S301 and S3023 PRINCIPAL OF 61 4 8 *teltuOmumixaM203S&103S)rabillim07(. "82H103S)rabillim255(gisp8H203S)rabillim 702(gisp3*roferusserp)gnisac( , , increase the outlet pressure setting of the regulator,the adjusting screw (key 3, figure 3) must be turnedclockwise.

10 This requires removal of the closing cap (key4). To reduce the outlet pressure setting, turn the adjustingscrew counterclockwise. A pressure gauge should alwaysbe used to monitor downstream pressure whileadjustments are being made. Do not adjust the spring toproduce an outlet pressure setting above the limit stampedon the closing cap. If the required pressure setting is notwithin the range of the spring being used, substitute withthe correct spring, see table 4. (Note: High pressure springsof 1 psig or more cannot be used in the low pressureregulators.)