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SERVING THE GAS INDUSTRY WORLDWIDE

Technical Description

GAS PRESSURE REGULATOR SERIES 850 VARIFLO VARIFLO™

BRYAN DONKIN RMG GAS CONTROLS LIMITED


GAS PRESSURE REGULATOR SERIES 850 Variflo™ Introduction, Application, Features, Technical Data Introduction • The Series 850 Variflo™ is a pilot operated gas pressure regulator. Utilisation of an external pilot ensures a safe and accurate controlled outlet pressure. • Use with confidence on natural gas or dry manufactured gases of non-aggressive nature, including Nitrogen, Carbon Dioxide, Propane and Butane. Application

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• Designed for use on gas pressure reduction services for municipal distribution, gas transmission and industrial power plant control systems. 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 SIZE RANGE

SERVICE CONDITIONS

DN 50

Flanges to:

Maximum Inlet Pressure

Up to 100 barg

DN 80

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

Minimum Inlet Pressure

3 barg

Outlet Pressure Range

0.15* to 40** barg

DN 100

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

Min. Operating Differential

0.5 barg

Max. Operating Differential

Class 150 : 19 barg Class 300 : 50 barg Class 600 : 70 barg

Temperature Range

-20ºC to +60ºC

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

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

Specification Designed to the requirements of BS EN 334


GAS PRESSURE REGULATOR SERIES 850 Variflo™ Technical Data Performance

FLOW COEFFICIENTS Size

Maximum full open capacities can be calculated using the following equations.

DN 50

Grid Plate Flow Rating 100%

2000

75%

1500

Sub-Critical Flow: Pa Pe

≤ 0.53

DN 80

50%

1000

100%

4200

75%

3150

50%

2100

100%

6000

75%

4500

50%

3000

3

Qn = KG • Pa (Pe - Pa) in m /h DN 100

Critical Flow-Rate: Pa Pe

KG

< 0.53 CONTROL CLASSIFICATION

Pe Qn = K G • in m3/h 2

Pilot Model

Outlet Pressure Pa (bar) 0.15 to 1

Accuracy Class AC (+/-%) 20

630

1 to 3

10

30

3 to 5

5

10

Example calculation: For 50mm size with 100% Flow Rating Duty: Inlet Pressure Outlet Pressure Inlet Temperature Medium

: 19 barg : 2 barg : 15OC : Natural Gas

Flowrate Calculation:

Pe = 20.013 bar A Pa = 3.013 bar A

2.5

10

20

30

1 to 3

20

30

3 to 5

10

20

5 to 40

5

10

Application Notes: Separate 2-Stage Pilot - used when inlet pressure variations are greater than 15 barg

640a Separate single Stage Pilot - used when inlet pressure variations are equal to or less than 15 barg

Pe Qn =

5 to 40 0.15 to 1 640a

630

Qn = Pa

Lock-Up Pressure Class SG (%) 30

3.013 = 0.150 20.013

Hence: Critical flow: <0.53

PILOT SELECTION barg

Qn = KG x Pe 2 Qn = 2000 x 20.013 2 Qn = 20.013 sm3/hr

Spring No Number

Colour

Wire Size (mm) 4.5

630 2-Stage Pilot 0.15 to 1.0

1*

Black

1 to 5

2

Yellow

5.6

2 to 10

3

Brown

6.3

5 to 20

4

Red

7.0

10 to 40

5

Green

8.0

640a Single Stage Pilot

Definition KG Pe Pa Qn

= = = =

Flow Coefficient Minimum Inlet Pressure (bar Abs.) Maximum Outlet Pressure (bar Abs.) Maximum flow Rate (m3/hr - natural gas)

0.15 to 1.0

1*

Black

4.5

1 to 5

2

Yellow

5.6

2 to 10

3

Brown

6.3

5 to 20

4

Red

7.0

10 to 40

5

Green

8.0

*Version with enlarged diagram

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GAS PRESSURE REGULATOR SERIES 850 Varifloâ&#x201E;˘ Sectional Arrangement

Outlet Pressure Adjuster Control Line Exhaust Line Diaphragm Valve Variable Restrictor Grid Plate

3 Connected to Body Inlet

Inlet Pressure

Series 850 VarifloTM with 640a Pilot

Carrier Plate

Outlet Pressure

Loading Pressure

Ease of Maintenance

Atmospheric Pressure

Unique designed Grid Plate


GAS PRESSURE REGULATOR SERIES 850 Variflo™

‘C’ ‘B’

‘D’

‘E’ ‘F’ ‘G’ (Service Height)

Dimensions & Materials of Construction

4

‘A’ (Face to Face)

DIMENSIONS & WEIGHTS Size

A

‘B’

‘C’

‘D’

‘E’

‘F’

‘G’

Weight (Kg)

286

162

83

300

150

190

250

31

317

337

225

100

300

190

240

390

60

368

394

250

145

350

220

270

420

105

Class 150

Class 300

Class 600

DN 50

254

267

DN 80

298

DN 100

352

All dimensions in mm

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 and systems 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

WÄGA WÄRME-GASTECHNIK GMBH Osterholzstrasse 45 D-34123 Kassel Tel +49 (0)561. 5007-0 Fax +49 (0)561. 5007-207

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

RMG-GASELAN REGEL + MEßTECHNIK GMBH Julius-Pintsch-Ring 3 D-15517 Fürstenwalde Tel +49 (0)3361. 356-60 Fax +49 (0)3361. 356-836

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

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

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