Emerson 912N Instruction Manual
Contents
1. 4 17 2 FOR TYPE 912H 8 ONLY LOCATE PER T10895 10 10 1 8 NPT 44 J 16 13 16 nA S lt MOO 1 8 NPT UU o Figure 3 912N Series with Handwheel Construction Assembly BB7822 Figure 2 912N Series Pressure Regulator Assembly Key Description Part Number Key Description Part Number 17 Closing Cap Gasket Composition 1E765204022 20 Lockwheel Brass 912N Series 18 Closing Spring 302 Stainless steel 912N Series with handwheel only 10234614012 with handwheel only 1E302037022 25 Spring Seat Brass 912N Series 19 Spacer Ring Brass 912N Series with handwheel only 10234514012 with handwheel only 10580714012 29 Disc GE12677T012 Recommended spare part Industrial Regulators Emerson Process Management Regulator Technologies Inc USA Headquarters McKinney Texas 75069 1872 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Shanghai China 201206 Tel 86 21 2892 9000 Europe Bologna Italy 40013 Tel 39 051 4190611 Middle East and Africa Dubai United Arab Emirates Tel 971 4811 8100 Natural Gas Technologies Emerson Process Management Regulator Technologies Inc USA Headquarters McKinney Texas 75069 1872 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Singapore Singapore 128461 Tel 65 6777 8211 Europe Bologna Italy 40013 Tel 39 051 419062. 1 4 or 3 8 NPT Maximum Allowable Inlet Pressure 250 psig 17 2 bar Outlet Pressure Ranges See Table 1 Maximum Allowable Outlet Pressure Emergency Outlet Pressure 20 psig 1 4 bar Recommended Outlet Pressure to Avoid Internal Part Damage 3 psi 0 21 bar differential above outlet pressure setting provide external relief if start to discharge point exceeds 3 psid 0 21 bar differential see Table 1 Internal Relief Performance Approximate Internal Relief Valve Start to Discharge Point See Table 1 Capacity Adequate only for relieving minor build up situations such as caused by chips or dirt blocking the seat partly open for major malfunctions external relief is required according to the Installation section Temperature Capabilities 20 to 160 F 29 to 71 C Pressure Registration Internal Vent Size 1 8 NPT tapped with removable screen Approximate Weight 1 3 pounds 0 6 kg 1 The pressure temperature limits in this Instruction Manual or any applicable standard limita ion should not be exceeded Table 1 Outlet Pressure Range Data AVAILABLE CONFIGURATION OUTLET PRESSURE RANGE 3 to 7 inches w c 7 to 17 mbar 912N Series 5 to 10 inches w c 12 to 25 mbar 9 25 to 13 inches w c 23 to 32 mbar 12 to 24 inches w c 30 to 60 mbar 0 5 to 2 7 psig 0 03 to 0 18 bar 2 7 to 5 psig 0 18 to 0 34 bar without handwheel 912N Series with handwheel 8 to 24 inches w c 20 t
3. 11 Gallardon France 28320 Tel 33 0 2 37 33 47 00 TESCOM Emerson Process Management Tescom Corporation USA Headquarters Elk River Minnesota 55330 2445 USA Tel 1 763 241 3238 Europe Selmsdorf Germany 23923 Tel 49 0 38823 31 0 For further information visit www fisherregulators com The Emerson logo is a trademark and service mark of Emerson Electric Co All other marks are the property of their prospective owners Fisher is a mark owned by Fisher Controls Inc a business of Emerson Process Management The contents of this publication are presented for informational purposes only and while every effort has been made to ensure their accuracy they are not to be construed as warranties or guarantees express or implied regarding the products or services described herein or their use or applicability We reserve the right to modify or improve the designs or specifications of such products at any time without notice Emerson Process Management does not assume responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any Emerson Process Management product remains solely with the purchaser EMERSON Emerson Process Management Regulator Technologies Inc 1979 2010 All Rights Reserved Proc Vianagement
4. Instruction Manual Form 5124 June 2010 912N Series 912N Series Pressure Regulators To avoid injury or equipment damage these regulators should be installed operated and maintained in accordance with federal state and local codes rules and regulations and Emerson Process Management Regulator Technologies Inc instructions Only a qualified person must install or service a regulator Be certain the control spring range label is updated to accurately indicate any field changes in equipment materials service conditions or pressure settings Immediately call a qualified technician in case of trouble If venting occurs or a leak develops in the system it indicates that service is required Failure to correct the situation immediately may create a hazardous condition Introduction Scope of the Manual This manual provides installation maintenance and parts information for the 912N Series pressure regulators Figure 1 as used in industrial natural gas applications Description The 912N Series pressure regulators are direct operated spring loaded devices built to provide accurate sensitive control suited to a variety of applications As outlet pressure begins to exceed the set pressure the diaphragm inside the regulator lifts operating a lever to close the inlet Pressure in excess of the relief valve spring force opens the relief valve allowing excess pressure to bleed through the screened vent in the sprin
5. e about this regulator include the type number date of manufacture and all other pertinent information from the labels Specify the eleven character part number when ordering new parts from the following parts list Parts List Key Description Part Number 1 Body Zinc 1 4 x 1 4 NPT 0 073 inch 1 9 mm port diameter 3D377144042 1 4 x 3 8 NPT 0 073 inch 1 9 mm port diameter 3B782444042 1 4 x 1 4 NPT 0 094 inch 2 4 mm port diameter T4000544042 1 4 x 3 8 NPT 0 094 inch 2 4 mm port diameter 3B892744042 2 Spring Case 3E294444042 3 Closing Cap 912N Series with handwheel Brass 10234414012 All others Plastic T13269T0012 4 Adjusting Screw 912N Series with handwheel Zinc Steel 14B7140X022 All others Plastic T1027706992 5 Regulator Spring Steel See Table 1 6 Relief Valve Spring Steel 1B784827012 7 Spring Seat Steel 1B783425072 8 Pin 302 Stainless steel 1B783535032 9 Relief Valve Seat Zinc pusher relieve valve post 2B783044012 10 Diaphragm Plate Zinc plated Steel 1B783824132 11 Disc Holder GE19397X012 12 Fulcrum Rod 302 Stainless steel 0U091435032 13 Machine Screw Steel 2 required T12748T0012 14 Machine Screw Steel 6 required 1V4131X0012 15 Diaphragm Nitrile NBR Spring Range 3 to 24 inches w c 7 to 60 mbar 1B7837T0022 Spring Range 0 5 to 5 psi 0 03 to 0 34 bar 1B783702012 16 Vent Screen 304 Stainless steel O0W086343062 912N Series
6. g case Specifications Specifications for the 912N Series regulators are given on page 2 www fisherregulators com Pr P1024 Figure 1 Type 912N Regulator Installation Personal injury or equipment damage may result if the regulator is installed where service conditions could exceed the pressure or temperature specifications in Specifications section The regulator must not be used for hazardous gas service in a closed area unless the vent is piped to a safe area The vent opening on the regulator or the opening on the remote vent pipe if one is used should be pointed down to minimize clogging from collected moisture corrosive chemicals and other foreign material Overpressuring the downstream system and risk of explosion could result from a clogged vent Overpressuring any portion of a regulator or associated equipment may cause leakage part damage or personal injury due to bursting of pressure containing parts or explosion of accumulated gas Like most regulators the 912N Series regulators have an outlet pressure rating lower than the inlet pressure rating Downstream protection is required if the actual inlet pressure can exceed the regulator outlet pressure rating or the pressure rating of any downstream equipment EMERSON Mana ment D100317X012 912N Series Specifications Available Configuration See Table 1 Body Sizes and End Connection Styles Inlet 1 4 NPT Outlet
7. ntrols a gas that is flammable or otherwise hazardous a spring case with the standard vent line should be used so that the exhaust can be piped away Provide protection on a remote vent by installing a screened vent cap into the remote end of the vent pipe The vent should be pointed down Apply a good grade of pipe compound to the pipe threads before making the connections Install piping into the 1 4 NPT inlet connection and the 1 4 or 3 8 NPT outlet connection Each regulator is factory set for the pressure setting specified on the order If no setting was specified the outlet pressure is factory set at the mid range of the control spring The procedure for adjusting the output pressure is given in the Startup section Startup Key numbers are referenced in Figure 2 With installation completed and downstream equipment properly adjusted slowly open the upstream and downstream shut off valves while monitoring the regulator output pressure For the 912N Series construction with no drive screw in the spring case never adjust the control spring to produce an outlet pressure higher than the outlet pressure range for that particular spring Doing so could overpressure the system and cause personal injury or equipment damage If the desired outlet pressure is not within the range of the control spring install a spring of the proper range according to the Maintenance section If outlet pressure adjustment is necessary monitor
8. o 60 mbar 2 7 to 5 psig 0 18 to 0 34 bar APPROXIMATE POINT ABOVE OUTLET E PRESSURE SETTING AT WHICH INTERNAL RELIEF STARTS TO DISCHARGE Part Number poe 5 to 21 inches w c 12 to 52 mbar 1B784327222 Red 8 to 30 inches w c 20 to 75 mbar 1B784427222 Orange 16 to 39 inches w c 40 to 97 mbar 1L507937022 Unpainted 17 inches w c to 3 psig 42 mbar to 0 21 bar 1B784527222 Blue 0 70 to 6 80 psig 0 05 to 0 47 bar 1B784627222 Yellow 3 80 to 12 5 psig 0 26 to 0 86 bar 1B784727222 Green 30 3 to 35 4 inches w c 75 to 88 mbar 1B784527222 Blue 5 4 to 6 7 psig 0 37 to 0 46 bar 1B784727222 Green 1 Internal Relief Performance is only adequate for relieving minor build up situations External relief is required if start to discharge point exceeds 3 psid 0 21 bar differential Regulator operation within ratings does not preclude the possibility of damage from external sources or from debris in the lines A regulator should be inspected for damage periodically and after any overpressure condition Ensure that the regulator is undamaged and contains no foreign material Install the regulator so that the flow through it leaves the outlet port marked on the body The regulator may be installed in any position However the spring case vent should be pointed down Spring case vent orientation can be changed by rotating the spring case with respect to the body For an indoor installation if the regulator co
9. ol Spring Replacement Refer to Figure 2 on units without the handwheel unscrew the closing cap key 3 and turn the adjusting screw out of the spring case Lift out the control spring key 5 Refer to Figure 3 on units with a handwheel key 4 turn the handwheel counterclockwise until the tension is relieved from the control spring key 5 Unscrew the nut at the base of the handwheel and lift the handwheel off the spring case key 2 Lift out the adjusting screw key 4 and the control spring 912N Series Replace the control spring and complete the assembly by replacing the adjusting screw and the closing cap or handwheel Adjust the spring tension as described in the Startup section Diaphragm and Relief Valve Replacement Remove cap screws key 14 and separate the spring case from the valve body Remove the control spring key 5 and the diaphragm key 15 along with the diaphragm head key 10 the relief valve seat key 9 and the relief valve spring key 6 Separate these parts by removing the pin key 8 and the spring seat key 7 To reassemble the regulator first assemble the relief valve spring assembly then replace the relief valve spring assembly the diaphragm the diaphragm head and fit the spring case to the body Install and tighten cap screws key 14 ina crisscross manner Adjust the control spring tension as described in the Startup section Parts Ordering When corresponding with the local Sales Offic
10. the outlet pressure with a gauge while performing the following procedures 1 For units without a handwheel unscrew the closing cap key 3 and insert a screw driver blade into the adjusting screw key 4 2 Slowly turn the adjusting screw or handwheel clockwise to increase or counterclockwise to decrease the output pressure setting 3 With the output pressure adjusted to the desired value replace the closing cap on units without a handwheel Shutdown Close the nearest upstream shut off valve then close the nearest downstream shut off valve and vent pressure from the outlet of the regulator Maintenance Regulator parts are subject to normal wear and must be inspected and replaced as necessary The frequency of inspection and replacement of parts depends on the severity of service conditions or the requirements of local state and federal rules and regulations To avoid personal injury or equipment damage do not attempt any maintenance or disassembly without first isolating the regulator from system pressure and relieving all internal pressure from the regulator This procedure is to be performed if changing the control spring for one of a different range or for inspecting cleaning or replacing any other parts Key numbers are referenced in Figures 2 and 3 Note If sufficient clearance exists the regulator body key 1 can remain in the line during spring replacement or other maintenance procedures Contr
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