Emerson 912N Data Sheet
Contents
1. 912N Series regulators may be installed in any position however the spring case vent should be pointed down on outside installations If gas escaping through the internal relief valve could constitute a hazard the spring case vent should be piped to a location where escaping gas will not be hazardous If the vent will be piped to another location obstruction free tubing should be used and a screened vent should be installed on the end of the vent pipe On all installations the vent or end of the vent pipe must Table 1 Outlet Pressure Range Data Bulletin 71 1 912N APPROXIMATE POINT ABOVE OUTLET CONTROL SPRING SELECTION AVAILABLE PRESSURE SETTING AT WHICH i i i CONSTRUCTION OUTLET PRESSURE RANGE INTERNAL RELIEF STARTS Part Number Color fe ree TO DISCHARGE gode Inch mm Inch mm 3 to 7 inches w c 7 to 17 mbar 5 to 21 inches w c 12 to 52 mbar 1B784327222 Red 1 09 27 7 0 035 0 89 5 to 10 inches w c 12 to 25 mbar 8 to 30 inches w c 20 to 75 mbar 1B784427222 Orange 1 37 34 8 0 037 0 94 912N Series 9 25 to 13 inches w c 23 to 32 mbar 16 to 39 inches w c 40 to 97 mbar 1L507937022 Unpainted 1 78 45 2 0 038 0 97 without handwheel 12 to 24 inches w c 30 to 60 mbar 17 inches w c to 3 psig 42 mbar to 0 21 bar 1B784527222 Blue 1 34 34 0 0 047 1 19 0 5 to 2 7 psig 0 03 to 0 18 bar 0 70 to 6 80 psig 0 05 to 0 47 bar 1B784627222 Yellow 1 19 30 2 0 075 1 92. 180 210 234 259 43 inches w c 1L507937022 ai zsa 27 mbar 23 to 32 mbar 2 mbar 1 64 2 68 3 86 4 37 4 82 5 63 6 27 6 94 gt 12 to 20 inches w c 2 inches w c 58 95 137 163 189 243 303 315 24 inches w c 1B784527222 oes 50 mbar 80 to 60 mbar 5 mbar 1 55 2 55 3 67 4 37 5 07 6 51 8 12 8 44 10 51 63 83 99 105 148 204 236 A PES i i 1 37 1 69 2 22 2 65 2 81 3 97 5 47 6 33 a bee aes 19 oli 1B784627222 69 mbar 0 03 to 0 18 bar 20 ____ 70 100 140 177 201 302 377 440 i 1 88 2 68 3 75 4 74 5 39 8 09 10 1 11 8 se __ _ 62 91 120 155 178 249 304 358 p i 0 5 to 2 7 psig 0 094 1 66 2 44 3 22 4 15 4 77 6 67 8 15 9 59 138 mb 0 03 to 0 18 b ee 2 4 138 mbar Wee te Oe bar Gh 24 85 146 220 300 348 480 576 683 2 28 3 91 5 90 8 04 9 33 12 9 15 4 18 3 es 68 107 149 207 329 329 425 618 v Srs 5 psig 2 7 to 5 psig 1 82 2 87 3 99 5 55 8 82 8 82 11 4 16 6 345 mb 0 18 to 0 34 b yen eee 345 mbar AP FG 100 34 bar 20 ____ 94 169 283 386 486 711 860 1030 2 52 4 53 7 58 10 3 13 0 19 1 23 0 27 6 Not recommended for the given pressure range Table 3 Capacities for
3. Regulator Technologies Inc USA Headquarters McKinney Texas 75069 1872 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 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 Asia Pacific Singapore Singapore 128461 Tel 65 6777 8211 Asia Pacific Shanghai China 201206 Tel 86 21 2892 9000 Europe Europe Bologna Italy 40013 Bologna Italy 40013 Tel 39 051 4190611 Tel 39 051 4190611 Middle East and Africa Gallardon France 28320 Dubai United Arab Emirates Tel 33 0 2 37 33 47 00 Tel 971 4811 8100 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
4. Stainless steel spring wire Relief Valve Assembly Brass and zinc Closing Cap and Adjusting Screw Constructions Without Handwheel Plastic Closing Cap and Adjusting Screw Assembly Optional Handwheel Constructions Only Brass zinc and steel Closing Cap Gasket Composition Vent Screen 304 Stainless Steel 1 The pressure temperature limits in this Bulletin or any applicable standard limitation should not be exceeded downward and the valve disk moves away from the orifice 912N Series regulators include an internal relief valve for overpressure protection Overpressure Protection The 912N Series have outlet pressure ratings lower than their inlet pressure ratings Although the internal relief valve provides very limited downstream overpressure protection complete downstream protection is needed if the actual inlet pressure exceeds the outlet pressure rating Overpressuring any portion of these regulators may cause leakage damage to regulator parts or personal injury due to bursting of pressure containing parts or explosion of accumulated gas Provide appropriate overpressure protection devices to ensure that none of the limits found in the Specifications section or Table 1 will be exceeded Regulator operation with normal operating limits does not preclude the possibility of damage from external sources or from debris in the gas line A regulator should be inspected for damage after any overpressure condition Installation
5. 1 2 7 to 5 psig 0 18 to 0 34 bar 3 80 to 12 5 psig 0 26 to 0 86 bar 1B784727222 Green 1 31 33 3 0 080 2 03 912N Series 8 to 24 inches w c 20 to 60 mbar 30 3 to 35 4 inches w c 75 to 88 mbar 1B784527222 Blue 1 34 34 0 0 047 1 19 with handwheel 2 7 to 5 psig 0 18 to 0 34 bar 5 4 to 6 7 psig 0 37 to 0 46 bar 1B784727222 Green 1 31 33 3 0 080 2 03 1 Internal Relief Performance is only adequate for relieving minor buildup situations External relief is required if start to discharge point exceeds 3 psid 0 21 bar differential Table 2 Capacities for Type 912N Regulators without Handwheel Body Size 1 4 x 3 8 NPT CAPACITY IN SCFH Nm h OF 0 6 SPECIFIC GRAVITY NATURAL GAS OUTLET OUTLET SPRING ORIFICE PRESSURE PRESSURE PART OFFSET SIZE Inlet Pressure Psig bar SETTING RANGE NUMBER INCH mm 5 10 25 50 75 100 150 200 250 0 34 0 69 1 7 3 4 5 2 6 9 10 3 13 8 17 2 5 inches w c 3 to 7 inches w c 1 inch w c 53 73 136 199 12 mbar 7t0 17 mbar 18784827222 2 mbar 1 42 1 96 3 65 6 33 77 Tp 7 inches w c 5 to 10 inches w c 1B784427222 1 inch w c Poor 72 122 171 187 222 222 232 _ 17 mbar 12 to 25 mbar 2 mbar 1 93 3 27 4 58 5 01 5 95 5 95 6 22 11 inches w c oe 1 inch w c ne 61 100 144 163
6. Bulletin 71 1 912N April 2010 912N Series Pressure Regulators Introduction The 912N Series direct operated spring loaded regulators are used in a variety of service and industrial applications These regulators have limited capacity internal relief across the diaphragm see Figure 2 to help minimize overpressure Any outlet pressure above the start to discharge point of the non adjustable relief valve spring moves the diaphragm off the relief valve seat allowing excess pressure to bleed out through the screened spring case vent Inlet pressure capabilities are the same for all regulators described in this bulletin However outlet pressure ranges vary according to construction see Table 1 Features e Accurate and Sensitive Control Disk lever assembly is attached to a roller style pivot for smoother action Handwheel construction is available for adjustment of the pressure setting Versatility These regulators are suitable for a variety of gaseous fluids including natural gas propane and air They are often used to supply loading pressure to other units Weather and Insect Protection Drip lip vent helps resist blockage during icing conditions When the regulator is installed with the vent pointing down any ice that builds up forms a protective sheath that helps keep the opening unobstructed The vent screen helps prevent foreign material from entering the spring case and clogging or otherwise hindering regula
7. Type 912N Regulators with Handwheel Body Size 1 4 x 3 8 NPT CAPACITY IN SCFH Nm h OF 0 6 SPECIFIC GRAVITY NATURAL GAS ORIFICE OUTLET OUTLET SPRING PRESSURE PRESSURE PART OFFSET ae Inlet Pressure Psig bar SETTING RANGE NUMBER imm 5 10 25 50 75 100 150 200 250 0 34 0 69 1 7 3 4 5 2 6 9 10 3 13 8 17 2 14 inches w c 8 to 24 inches w c 5784527222 2 inches w c 70 96 121 129 143 156 156 190 212 35 mbar 20 to 60 mbar 5mbar oo94 1 88 2 57 3 24 8 46 3 83 4 18 4 18 5 09 5 68 2 4 3 psig eT tops 15784727222 10 92 153 261 354 459 587 716 731 207 mbar 0 18 to 0 34 bar 2 47 4 10 7 00 9 49 12 3 15 7 19 2 19 6 Not recommended for the given pressure range Bulletin 71 1 912N be protected from corrosive chemicals debris weather a gt 0 2 condensation or anything else that might clog or enter the i ia 5 spring case A Regulator dimensions are shown in Figure 3 VENT CONNECTION TAPPED C itv Inf ti REMOVABLE apacity Information REMOVA Natural gas regulating capacities at selected inlet pressures eee and outlet pressure settings are given in Tables 2 and 3 y Flows are in SCFH 60 F and 14 7 psia of 0 6 specific a gravity natural gas To determine the equivalent capacities 13 for othe
8. above outlet pressure setting provide external relief if start to discharge point exceeds 3 psid 0 21 bar differential see Table 1 Body Port Diameter 0 073 or 0 094 inch 1 9 or 2 4 mm Wide Open Cc for Relief Sizing 4 Typical Regulating Capacities See Tables 2 and 3 Internal Relief Performance Approximate Internal Relief Valve Start to Discharge Point See Table 1 Capacity Adequate only for relieving minor buildup situations such as those caused by chips or dirt blocking the seat partly open for major malfunctions external relief is required according to the Overpressure Protection section Temperature Capabilities 20 to 160 F 29 to 71 C Pressure Registration Internal Spring Case Vent Standard Construction 1 8 NPT tapped with removable screen Standard Location Constructions Without Handwheel Over body outlet Handwheel Constructions Over body inlet Approximate Weight 1 3 pounds 0 6 kg Construction Materials Body Lower Casing Zinc Spring Case Zinc Spring Case Bolting Plated carbon steel Disk Lever Assembly Fluorocarbon FKM disk with zinc lever stainless steel lever pin and rod and plated carbon steel lever screws Diaphragm Nitrile NBR Nylon PA Diaphragm Plate Plated steel Spring Seat Plated steel Control and Relief Valve Spring Plated steel spring wire except stainless steel spring wire for control spring 1L507937022 Closing Spring Optional Handwheel Constructions Only
9. of any product Responsibility for proper selection use and maintenance of any Emerson Process Management product remains solely with the purchaser amp EMERSON rant i crt Emerson Process Management Regulator Technologies Inc 1978 2010 All Rights Reserved
10. r gases multiply the table capacity by the following appropriate conversion factor 0 775 for air 0 789 for nitrogen 0 625 for propane or 0 548 for butane For gases of other specific gravities multiply the given capacity by 0 775 and divide by the square root of the appropriate specific gravity 3 Flowing inlet pressures maximum minimum nominal and pressure drops 2 0 51 3 6 INCHES A88148 C gt A2387 91 mm Figure 3 Dimensions Then if capacity is desired in normal cubic meters per hour Nm h at 0 C and 1 01325 bar multiply SCFH 4 Desired outlet pressure setting or range by 0 0268 5 Range of flow rates minimum controlled maximum normal Ordering Information 6 When ordering specify Piping size s Construction Application 1 Composition and specific gravity of gas including chemical analysis if possible Carefully review the information found in the Specifications section on page 2 and in each referenced table or figure Specify the desired choice whenever a selection is offered Always be sure to specify the regulator type number For information on UL Listed constructions contact your local Sales Office 2 Range of temperatures Industrial Regulators Natural Gas Technologies TESCOM 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 Emerson Process Management
11. tor operation Easy Maintenance Diaphragm and disk lever assembly can be replaced without removing the regulator from the pipeline Principle of Operation Refer to Figure 2 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 orifice and reduces gas flow If demand downstream increases pressure under the diaphragm decreases Spring force pushes the pusher post assembly VENT SCREEN N DIAPHRAGM www fisherregulators com P1024 REGULATOR SPRING RELIEF VALVE SPRING PUSHER POST ASSEMBLY RELIEF VALVE SEAT M1021 DISK LEVER ASSEMBLY L VALVE DISK BODY LOWER CASING GE INLET PRESSURE m OUTLET PRESSURE C ATMOSPHERIC PRESSURE Figure 2 912N Series Operational Schematic Standard Spring Case Vent Shown 4 S EMERSON Process Management D100124X012 Bulletin 71 1 912N Specifications Available Constructions See Table 1 Body Sizes and End Connection Styles Inlet 1 4 NPT Outlet 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 psid 0 21 bar differential
Download Pdf Manuals
Related Search