Fisher MR108 Series Instruction Manual
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Fisher MR108 Series Instruction Manual

Direct-operated backpressure regulator
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Instruction Manual
Form 5875
March 2015
Type MR108 Direct-Operated
Backpressure Regulator
Contents
Introduction ............................................................... 3
Specifi cations ........................................................... 2
Principle of Operation ............................................... 3
Installation ................................................................ 6
Overpressure Protection........................................... 8
Startup ...................................................................... 8
Adjustment ............................................................... 8
Shutdown.................................................................. 9
Maintenance ............................................................. 10
Parts List................................................................... 16
!
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fi re and/or chemical contamination
causing property damage and personal
injury or death.
Fisher
backpressure regulators must
®
be installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations
and Emerson Process Management
Regulator Technologies, Inc.
(Emerson™) instructions.
If a leak develops or if the outlet
continually vents gas, service to the
unit may be required. Failure to correct
trouble could result in a hazardous
condition. Only a qualifi ed person must
install or service the unit.
P1202
TyPE MR108 WITH
LOW-PRESSURE ACTUATOR
Figure 1. Type MR108 Direct-Operated Backpressure Regulators
Installation, operation and maintenance
procedures performed by unqualifi ed
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Use qualifi ed
personnel when installing, operating
and maintaining the Type MR108
backpressure regulator.
To avoid cavitation, it is recommended
that the customer follow the bulletin
capacity sizing guidelines found in
Bulletin 71.4:MR108.
www.fisherregulators.com
Type MR108
P1203
TyPE MR108 WITH
HIgH-PRESSURE ACTUATOR
Note

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Summary of Contents for Fisher MR108 Series

  • Page 1: Table Of Contents

    Installation, operation and maintenance injury or death. procedures performed by unqualifi ed personnel may result in improper Fisher backpressure regulators must ® adjustment and unsafe operation. Either be installed, operated and maintained condition may result in equipment in accordance with federal, state and damage or personal injury.

  • Page 2: Specifications

    Type MR108 Specifications The Specifications section on this page provides the ratings and other specifications for the Type MR108. The following information is stamped on the nameplate fastened on the regulator at the factory: type; body size; maximum inlet, outlet and differential pressure; maximum pressure above setpoint; maximum casing pressure; maximum temperature;...

  • Page 3: Introduction

    Type MR108 Table 2. Backpressure Control Ranges MAxIMUM PRESSURE SPRINg WIRE SPRINg FREE OVER SETPOINT TO SPRINg SPRINg RANgE ACTUATOR SPRINg DIAMETER LENgTH AVOID INTERNAL COLOR TyPE PART NUMBER PARTS DAMAgE CODE psig psig 5 to 14 0.34 to 0.97 GE42909X012 White 0.44...
  • Page 4 Type MR108 CAgE VALVE SPRINg VALVE PLUg ACTUATOR STEM TYPE Y602-12 VENT 1/2 NPT CONTROL LINE CONNECTION DIAPHRAgM ACTUATOR TYPE Y602-12 VENT POINTED DOWN OR 1/2 NPT PRESSURE-LOADED SPRINg CASE VENT CONTROL SPRINg M1179 TyPE MR108 WITH LOW-PRESSURE ACTUATOR CAgE VALVE PLUg VALVE SPRINg ACTUATOR STEM...
  • Page 5 Type MR108 Table 4. Maximum Inlet, Outlet and Emergency Casing Pressures MAxIMUM INLET MAxIMUM OUTLET MAxIMUM EMERgENCy PRESSURE PRESSURE CASINg PRESSURE BODy Low-Pressure High-Pressure Low-Pressure High-Pressure Low-Pressure High-Pressure MATERIAL CONNECTION Actuator Actuator Actuator Actuator Actuator Actuator psig psig psig psig psig psig 23.4...

  • Page 6: Installation

    Type MR108 Installation damage. To avoid such injury and damage, make certain the bleed valve (if used) is properly closed after venting air. WARNINg Always open bleed valves slowly. These valves contain no packing, so some fluid Personal injury or system damage weepage will occur when the valves may result if this regulator is installed, are opened.
  • Page 7 Type MR108 Installation Location Upstream Control Line Installation WARNINg CAUTION Personal injury, equipment damage or This regulator can be installed in a pit, leakage due to escaping fluid may result which is prone to flooding. The vents of if the bonnet (key 61, Low-Pressure the spring case and lower diaphragm Actuator) or lower diaphragm casing casing (High-Pressure Actuator) or...

  • Page 8: Overpressure Protection

    Type MR108 Overpressure Protection CAUTION WARNINg Pressure gauges must always be used to monitor downstream pressure Personal injury, equipment damage during Startup. or leakage due to escaping 1. Check that proper installation is completed and accumulated gas or bursting of downstream equipment has been properly adjusted.

  • Page 9: Shutdown

    Type MR108 1/8 NPT INLET BLEED VALVE (KEY 85) DRAIN VALVE (KEY 82) Figure 3. Type MR108 with High-Pressure Actuator, Drain Valve and Bleed Valve Option Shutdown The factory setting of the backpressure regulator is the midpoint of the spring range unless otherwise specified on order.

  • Page 10: Maintenance

    Only parts manufactured by Note Emerson™ should be used for repairing To avoid internal damage due to Fisher regulators. Restart gas utilization ® reverse pressurization of main valve equipment according to normal components, make certain backpressure startup procedures.

  • Page 11: Adaptor (Key

    Type MR108 Disassembly pipeline orientations. Follow your company policy for lifting and handling heavy parts. WARNINg 1. Loosen the hex nuts (key 29) and stud bolts (key 3), To avoid personal injury resulting remove the body flange (key 2) from the valve body from sudden release of pressure, (key 1) and lift out the trim package.
  • Page 12 Type MR108 the body flange. Install the valve spring (key 9) and Replacing Main Spring install the actuator on the body flange by screwing the adaptor (90 to 130 ft-lbs / 122 to 176 N•m) into 1. Loosen the jam nut (key 72). If a pressure-loaded the body flange.
  • Page 13 Type MR108 Note Note Exercise care to ensure that the Position the bonnet (key 61) such that actuator stem (key 40) enters and exits the vent (key 26) is facing valve body the lower diaphragm head bore without (key 1) inlet, the lube fitting (key 44) is pinching, cutting or damaging in any way facing body outlet end and the 1/2 NPT the lower diaphragm head O-ring (key 51).
  • Page 14 Type MR108 Note WARNINg For pressure-loaded actuator option skip steps 20 and 21 and proceed to step 22 Personal injury, equipment damage or with upper casing welding assembly leakage due to escaping fluid may result (key 87). if adjusting screw (key 73) and jam nut (key 72) are not installed properly.
  • Page 15 Type MR108 10. If it is desired to replace the stem O-rings and Note bearings (keys 47 and 46, details X and Z), Exercise care to ensure that the actuator disconnect the control line tubing. Remove the stem (key 40) enters and exits the lower lower diaphragm casing (key 62) by unthreading it diaphragm head bore without pinching, from the adaptor (key 74).

  • Page 16: Parts List

    23. Lubricate cap screws (key 67) and use to secure under any circumstances, be used in the spring case (key 70) to the spring case spacer any Fisher regulator, because they will (key 66). Tighten the cap screws to a final torque of void your warranty, might adversely 25 to 28 ft-lbs / 34 to 38 N•m.
  • Page 17 Type MR108 Key 1, Type MR108 Valve Bodies BODY SIzE, NPS / DN MATERIAL END CONNECTION 1 / 25 2 / 50 3 / 80 4 / 100 34B7611X012 38A8845X012 - - - - - - - - - - - - - - - - - - - - - - Cast iron CL125 FF...
  • Page 18 Type MR108 Description Part Number Description Part Number Upper Seal (NACE) Adaptor O-ring (NACE) For NPS 1 / DN 25 Body Size For NPS 1 / DN 25 Body Size Nitrile (NBR) 14A6789X012 Nitrile (NBR) 10A8931X012 Fluorocarbon (FKM) 14A8187X012 Fluorocarbon (FKM) 10A0811X012 For NPS 2 / DN 50 Body Size For NPS 2, 3 and 4 / DN 50, 80 and 100 Body Sizes...
  • Page 19 Type MR108 SEE DETAIL V SEE DETAIL X SEE DETAIL Z SEE DETAIL Y SEE DETAIL W GE38436 NOTE: KEyS 64 AND 71 ARE USED ONLy FOR PRESSURE-LOADED ACTUATORS. APPLy LUBRICANT OR SEALANT L1 = MULTI-PURPOSE POLyTETRAFLUOROETHyLENE (PTFE) LUBRICANT L3 = ANTI-SEIzE COMPOUND S = MULTI-PURPOSE PTFE THREAD SEALANT 1.
  • Page 20 Type MR108 Description Part Number Description Part Number Jam Nut (NACE) (2 required) Upper Casing O-ring Zinc-plated steel 1A946324122 (For Low and High-Pressure Actuator) Belleville Spring Washer (NACE) GG04933X012 Nitrile (NBR) 1P233206992 Lower Diaphragm Head O-ring (NACE) Fluorocarbon (FKM) 1P2332X0012 Nitrile (NBR) 1P420706992 Cap Screw (10 required)
  • Page 21 Type MR108 GE38436 APPLy LUBRICANT OR SEALANT L1 = MULTI-PURPOSE PTFE LUBRICANT L2 = MULTI-PURPOSE NLgI gRADE 1 gREASE L3 = ANTI-SEIzE COMPOUND S = MULTI-PURPOSE PTFE THREAD SEALANT 1. Lubricants and sealants must be selected such that they meet the temperature requirements. 2.
  • Page 22 Type MR108 HIGH-PRESSURE ACTUATOR OPTION GE38436 NOTE: KEyS 64 AND 71 ARE USED ONLy FOR PRESSURE-LOADED ACTUATORS. APPLy LUBRICANT OR SEALANT L1 = MULTI-PURPOSE PTFE LUBRICANT S = MULTI-PURPOSE PTFE THREAD SEALANT 1. Lubricants and sealants must be selected such that they meet the temperature requirements. Figure 4.
  • Page 23 Type MR108 DETAIL V DETAIL W DETAIL x DETAIL y DETAIL Z GE38436 APPLy LUBRICANT L1 = MULTI-PURPOSE PTFE LUBRICANT 1. Lubricants must be selected such that they meet the temperature requirements. Figure 4. Type MR108 Direct-Operated Backpressure Regulator Assemblies (continued)
  • Page 24 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 International LLC, a business of Emerson Process Management.

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