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
1
• 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
2
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
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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
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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