SERVING THE GAS INDUSTRY WORLDWIDE

Technical Description

GAS PRESSURE REGULATOR SERIES 850 VARIFLO™

BRYAN DONKIN RMG GAS CONTROLS LIMITED

GAS PRESSURE REGULATOR SERIES 850 VARIFLO

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GAS PRESSURE REGULATOR SERIES 850 Variflo™

Introduction, Application, Features, Technical Data

Application

• Designed for use on gas pressure reduction services for municipal distribution, gas transmission and industrial powerplant control systems.

Introduction

• The Series 850 Variflo™ is a pilot operated gas pressure regulator. Utilisation of an external pilot ensures a safe andaccurate controlled outlet pressure.

• Use with confidence on natural gas or dry manufactured gases of non-aggressive nature, including Nitrogen, CarbonDioxide, Propane and Butane.

Features & Benefits

• High Performance• Wide operational pressure range• Pilot operated for accurate control• Easy In-Line servicing• Simplified design• Optional Relief Valve version utilising the RMG 642 pilot

Specification

Designed to the requirements of BS EN 334

* version with enlarged diaphragm** achieved by pilot spring change

SIZE RANGE

DN 50

DN 80

DN 100

Flanges to:

ANSI B16.5 Class 150 (Max. Inlet Pressure 19 barg)

ANSI B16.5 Class 300 (Max. Inlet Pressure 50 barg)

ANSI B16.5 Class 600 (Max. Inlet Pressure 100 barg)

SERVICE CONDITIONS

Maximum Inlet Pressure Up to 100 barg

Minimum Inlet Pressure 3 barg

Outlet Pressure Range 0.15* to 40** barg

Min. Operating Differential 0.5 barg

Max. Operating Differential Class 150 : 19 bargClass 300 : 50 bargClass 600 : 70 barg

Temperature Range -20ºC to +60ºC

Application Notes:630 Separate 2-Stage Pilot - used when inlet pressure

variations are greater than 15 barg640a Separate single Stage Pilot - used when inlet

pressure variations are equal to or less than 15 barg

Example calculation: For 50mm size with 100% Flow Rating

Duty:Inlet Pressure : 19 bargOutlet Pressure : 2 bargInlet Temperature : 15OCMedium : Natural Gas

Flowrate Calculation: Pe = 20.013 bar APa = 3.013 bar A

KG = Flow CoefficientPe = Minimum Inlet Pressure (bar Abs.)Pa = Maximum Outlet Pressure (bar Abs.)Qn = Maximum flow Rate (m3/hr - natural gas) *Version with enlarged diagram

Performance

Definition

Maximum full open capacities can be calculated using thefollowing equations.

Sub-Critical Flow:

Pa0.53

Qn = KG • Pa (Pe - Pa) in m3/h

Pe

GAS PRESSURE REGULATOR SERIES 850 Variflo™

2

Technical Data

Hence: Critical flow: <0.53 PILOT SELECTION

barg Spring No Colour Wire Size Number (mm)

630 2-Stage Pilot0.15 to 1.0 1* Black 4.5

1 to 5 2 Yellow 5.62 to 10 3 Brown 6.35 to 20 4 Red 7.0

10 to 40 5 Green 8.0640a Single Stage Pilot0.15 to 1.0 1* Black 4.5

1 to 5 2 Yellow 5.62 to 10 3 Brown 6.35 to 20 4 Red 7.0

10 to 40 5 Green 8.0

CONTROL CLASSIFICATION

Pilot Outlet Accuracy Lock-UpModel Pressure Class Pressure

Pa (bar) AC (+/-%) Class SG (%)0.15 to 1 20 30

630 1 to 3 10 303 to 5 5 10

5 to 40 2.5 100.15 to 1 20 30

640a 1 to 3 20 303 to 5 10 20

5 to 40 5 10

FLOW COEFFICIENTS

Size Grid Plate KG

Flow RatingDN 50 100% 2000

75% 150050% 1000

DN 80 100% 420075% 315050% 2100

DN 100 100% 600075% 450050% 3000

≤

Critical Flow-Rate:

Pa

Qn = KG • in m3/h

Pe

Pe

2

< 0.53

Pa

Qn = = 0.150

Qn = Pe

3.013 20.013

KG x Pe

Qn = 2000 x 20.013

Qn = 20.013 sm3/hr

Qn = 2

2

Diaphragm Valve

Grid Plate

CarrierPlate

Outlet Pressure Adjuster

Variable Restrictor

Connected to Body Inlet

Control Line

Exhaust Line

Inlet Pressure Outlet Pressure Loading Pressure Atmospheric Pressure

Series 850 VarifloTM

with 640a PilotEase of

MaintenanceUnique designed

Grid Plate

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GAS PRESSURE REGULATOR SERIES 850 Variflo™

Sectional Arrangement

All dimensions in mm

‘A’ (Face to Face)

‘G’ (

Serv

ice

Heig

ht)

‘D’

‘E’

‘F’

‘B’

‘C’

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GAS PRESSURE REGULATOR SERIES 850 Variflo™

Dimensions & Materials of Construction

DIMENSIONS & WEIGHTS

Size A ‘B’ ‘C’ ‘D’ ‘E’ ‘F’ ‘G’ Weight (Kg)

Class 150 Class 300 Class 600

DN 50 254 267 286 162 83 300 150 190 250 31

DN 80 298 317 337 225 100 300 190 240 390 60

DN 100 352 368 394 250 145 350 220 270 420 105

MATERIALS OF CONSTRUCTION

Main Regulator

Body Cast Steel: ASTM-A352LCB

Top Cover Carbon Steel Plate: EN10025-S355J2G3

Grid Plate Carrier Carbon Steel Plate/Ni plated : EN10025-S355J2G3

Grid Plate Stainless Steel: BS 1449 316S16

Main Spring Stainless Steel/Carbon Spring Steel

Top Diaphragm Plate Aluminium

Bottom Diaphragm Plate Aluminium/Anodised

Diaphragm Nitrile/Epichlorohyorin

Seals Nitrile

Connecting Pipework Stainless Steel

Connecting Fittings Steel plated/stainless steel compression rings

Pilot – Series 630 & 640a

Housing Aluminium

Diaphragms Nitrile Reinforced

Seals Nitrile

SERVING THE GAS INDUSTRY WORLDWIDE

RMG is your worldwide partner for gas control equipment, ranging from exploration to consumer supply. The comprehensive range of RMG products andsystems provides you with a total solution for all your gas control and measurement needs.

Modern manufacturing techniques combined with our expertise and specialist knowledge in the design and build of gas control equipment, including fully automated stations has earned RMG a worldwide reputation for supply of safe, accurate and reliable equipment.

WWW.RMG.COM

GERMANY

RMG REGEL + MESSTECHNIK GMBH Osterholzstrasse 45 D-34123 Kassel Tel +49 (0)561. 5007-0 Fax +49 (0)561. 5007-107 RMG MESSTECHNIK GMBH Otto-Hahn-Strasse 5 D-35510 Butzbach Tel +49 (0)6033. 897-0 Fax +49 (0)6033. 897-130 Works Ebersberg: - Software development - Anzinger Straße 14 D-85560 Ebersberg Tel +49 (0)8092. 20 97-0 Fax +49 (0)8092. 20 97-10 ENGLAND

BRYAN DONKIN RMG GAS CONTROLS LTD. Enterprise Drive, Holmewood Chesterfield S42 5UZ, England Tel +44 (0)12 46 501-501 Fax +44 (0)12 46 501-500 POLAND

GAZOMET SP. Z O.O. ul. Sarnowska 2 63-900 Rawicz, Polen Tel +48 (0)65 546 24 01 Fax +48 (0)65 546 24 08

WÄGA WÄRME-GASTECHNIK GMBH Osterholzstrasse 45 D-34123 Kassel Tel +49 (0)561. 5007-0 Fax +49 (0)561. 5007-207 RMG-GASELAN REGEL + MEßTECHNIK GMBH Julius-Pintsch-Ring 3 D-15517 Fürstenwalde Tel +49 (0)3361. 356-60 Fax +49 (0)3361. 356-836 CANADA

BRYAN DONKIN RMG CANADA LTD. 50 Clarke Street South, Woodstock Ontario N4S 0A8, Canada Tel +1 (0)519 53 98 531 Fax +1 (0)519 53 73 339 UNITED STATES OF AMERICA

MERCURY INSTRUMENTS INC. USA 3940 Virginia Avenue Cincinnati, Ohio U.S.A. 45227 Tel +1 (0)513 272 1111 Fax +1 (0)513 272 0211

The Bryan Donkin RMG Gas Controls policy is one of continuous improvement and development. The company reserves the right to change or introduce improved designs without notice.

R.850-01.01.08