SERVING THE GAS INDUSTRY WORLDWIDE
Technical Description
GAS PRESSURE REGULATOR SERIES 241
BRYAN DONKIN RMG GAS CONTROLS LIMITED
GAS PRESSURE REGULATOR SERIES 241 Introduction, Application, Features, Technical Data Introduction • The Series 241 is a direct acting single diaphragm, spring loaded open, lever operated regulator for use on gas pressure reduction systems. • Control of varying inlet pressure and capacity applications is ensured by utilising a range of interchangeable orifices of varying size. • Use with confidence on natural and manufactured gases of non-aggressive nature, including Nitrogen, Carbon Dioxide, Propane and Butane. Application
1
• Designed for use on gas pressure reduction services to domestic, business premises and small industrial feeds to burners, heater units, boilers and other items of equipment where an accurate, safe and dependable pressure controlled supply is required. Size Range 1/2”, 3/4” & 1” Screwed to BS.21 Rc. Installation The regulator may be mounted in any orientation to suit site conditions, moisture or debris must not ingress the vent hole. For optimum performance the recommended operating position is with diaphragm casing horizontal and spring housing pointing vertically upwards. It is important when installing equipment that pipeline stresses are kept to a minimum and no undue external forces are placed on the connections. SERVICE CONDITIONS Maximum Inlet Pressure
Up to 10.3 barg (150psig)
(dependent upon orifice size fitted)
Outlet Pressure Range: Internal Relief Valve Setting
10 to 82 mbar (4 to 33” wg) Nominally 20 mbarg (8” wg) (above regulator outlet pressure set point)
Temperature Range
-20OC to +60OC
REGULATOR RANGE Option
Description
P
No Internal Relief
241P
241LR
241R
•
LR
With Limited Internal Relief
R
With Internal Relief
OPCO - MK2
MK2 - Standard Over Pressure Cut-Off Valve
•
•
•
S.309LP - OPCO
Series 309LP Over Pressure Cut-Off Valve
•
•
•
S.309LP UPCO/OPCO
Series 309LP Combined Under/Over Pressure Safety Cut-Off Valve
•
•
•
• •
Features • Completely independent operation of regulator and safety cut-off valve. • Diaphragm casing can be rotated through 360O at intevals of 45O to assist servicing and installation in confined spaces. • Both regulator casing/valve head and safety cut-off valve can be removed from the body as cartridges, ensuring straightforward maintenance without removing the body from the pipeline. • Wide operational pressure range • Regulator can be fitted with over pressure (OPCO) or under/over pressure safety cut-off valve (UPCO/OPCO). These devices protect the downstream system in the event that a dangerous gas pressure condition develops.
GAS PRESSURE REGULATOR SERIES 241 Spring Selection, Materials of Construction REGULATOR SPRING RANGES Spring Outlet Pressure Range
S.309LP-OPCO SAFETY CUT-OFF VALVE Spring Cut-Off Range
Number
Colour
mbar g
ins wg
Number
Colour
mbar g
ins wg
121
Red
10 - 14
4-6
861
Brown
35 - 90
14 - 36
491
Self
13 - 25
5 - 10
1103
Gold
80 - 130
32 - 52
307
Green
23 - 45
9 - 18
1104
Purple
120 - 250*
48 - 100*
380
Orange
43 - 67
17 - 27
768
Blue
55 - 82
22 - 33
*Maximum Over pressure set point: 175mbar (70” wg) on S.241 regulator
S.309LP UPCO/OPCO SAFETY CUT-OFF VALVE Type Spring Cut-Off Range
OPCO MK2: Over Pressure Cut-Off Valve Spring Outlet Pressure Range Colour
mbar g
ins wg
861
Brown
35 - 70
14 - 28
868
Green
60 - 175
24 - 70
Number
Colour
mbar g
ins wg
1109
Grey
40 - 55
16 - 22
1110
Green
50 - 110
20 - 44
1111
Silver
110 - 200*
44 - 80*
1138
Blue/Green
10 - 30
4 - 12
OPCO
Number
UPCO
*Maximum Over pressure set point: 175mbar (70” wg) on S.241 regulator
Minimum differential between regulator outlet and safety cut-off pressure:
ORIFICE SELECTION Orifice Size
Maximum Inlet Pressure
mm
bar
2.5
10.3
3.5
7
5
4
6.3
2
7
2
• P-Type: 35 mbar (14” wg) or 10% above regulator set point, whichever is the higher • R/LR - Type: 55 mbar (22” wg) when internal relief fitted • When UPCO/OPCO is fitted then minimum differential for P-Type is 45 mbar (18” wg) and 65mbar (26” wg) for R/LR-Type (with internal relief)
MATERIALS OF CONSTRUCTION Regulator Body & body cover
Cast Iron to BS 1452
Lower/Upper diaphragm casing & spring housing
Aluminium Alloy: BS.1490
Diaphragm carrier and vent plate
Nylon 11
Vent pin, spring and gauze ring
Stainless Steel: BS.970
Orifice
Brass: BS.249
Valve seat & ‘O’ rings
Nitrile
Diaphragm
Nitrile
Valve head, stem, spring adjuster and cap
Aluminium: BS. 1476
Lever, pins, diaphragm plate and spindle
Carbon Steel: BS.4360 (Anti-corrosion plated)
Safety Cut-Off Valve (MK2) Lower/Upper diaphragm casing & spring housing
Aluminium Alloy: BS.1490
Diaphragm, spindle and reset spindle
Stainless Steel: BS.970 (Nylon bearing surface)
Diaphragm plate, pins, loading & valve spring
Carbon Steel: BS.4360 (Anti-corrosion plated)
Diaphragm and ‘O’ rings
Nitrile and Viton
Valve seat
Polyurethane
S.309LP UPCO/OPCO Safety Cut-Off Valve Body
Aluminium: BS.1490 LM6
Spindle
Stainless Steel: BS.970 Grade 316 S31
Valve
Aluminium: BS.1474 Grade 6082TF
Valve Seating
Polyurethane: BS.1449 CS4
Diaphragm & ‘O’ rings
Nitrile
Spring Adjuster
Brass: BS.249 Grade CZ 121
Spring
Spring Carbon Steel: BS.5216 Grade HS3
2
GAS PRESSURE REGULATOR SERIES 241 Capacities in SCMH for Natural Gas (SG:0.6) CAPACITIES Spring No. and Outlet Pressure
SPRING No. 121 10-14 mbar SET TO 12.5 mbar DROOP 2.5 mbar
SPRING No. 491 13-25 mbar SET TO 20 mbar DROOP 3 mbar
SPRING No. 307 23-45 mbar SET TO 37.5 mbar DROOP 5.6 mbar
SPRING No. 380 43-67 mbar SET TO 60 mbar DROOP 9 mbar
Inlet Pressure mbar 20 25 45 69 210 345 690 1 bar 1.5 2.0 2.5 3.0 4.0 6.0 7.0 8.0 8.6 10 25 45 69 210 345 690 1 bar 1.5 2.0 2.5 3.0 4.0 6.0 7.0 8.0 8.6 10 45 69 210 345 690 1 bar 1.5 2.0 2.5 3.0 4.0 6.0 7.0 8.0 8.6 10 69 210 345 690 1 bar 1.5 2.0 2.5 3.0 4.0 6.0 7.0 8.0 8.6 10
Orifice Size - Millimetres 2.5
1.9 3.6 4.7 6.9 8.1 10.3 12.7 15.6 17.6 18.4 29.7 32.7 36.0 36.8 36.8
3.5
2.7 5.5 8.1 13.7 16.4 21.0 25.2 28.3 30.6 34.7 49.3 58.1
1.3 2.4 3.6 5.6 7.4 9.9 12.4 14.5 16.4 20.1 26.2 28.8 32.6 36.8 36.8
2.1 3.7 5.3 8.7 13.1 19.8 25.2 29.2 31.8 37.1 45.6 54.7
1.4 2.8 4.4 6.3 7.7 10.4 12.4 14.8 16.5 21.8 29.4 32.4 35.6 36.8 36.8 1.0 2.9 4.0 6.4 7.8 10.3 12.4 14.7 17.0 21.2 28.3 31.3 34.5 36.8 36.8
2.1 4.6 6.5 11.7 15.3 22.6 25.6 29.5 31.9 36.0 38.2 45.9
1.6 4.1 6.5 10.6 15.3 20.4 25.5 29.7 32.0 38.2 43.2 51.8
5
6.3
7 3.3 4.1 5.8 9.1 18.5 25.3 30.4 33.8 38.2 42.5
2.1 3.1 3.7 11.1 15.9 20.4 23.4 28.9 33.1 35.7 38.2 42.4
3.3 4.7 6.7 15.6 21.6 26.7 30.0 35.3 39.6
1.3 2.3 3.0 5.6 9.3 18.9 24.6 29.5 31.3 35.0 38.1 39.6
1.6 3.0 4.2 9.4 17.0 25.1 30.7 34.1 38.5
1.8 3.5 4.9 12.3 23.0 28.9 33.8 38.7 42.1
2.1 4.2 6.8 11.2 21.3 25.8 31.3 35.0 39.2 41.7 42.9
2.6 5.2 10.0 17.3 28.7 34.0 38.5 41.6
2.8 5.8 12.3 21.7 33.4 38.9 42.0 44.4
2.5 6.7 11.0 21.0 27.4 35.3 37.1 40.7 42.8 45.3
3.2 9.8 15.3 29.7 34.4 39.8 42.7
3.6 11.9 19.7 35.7 41.4 42.6 46.9
3
Type of Gases: The capacities shown in the table are given in terms of natural gas SG 0.6. For all other gases multiply by the 0.6 following correction factor: SG of gas handled
GAS PRESSURE REGULATOR SERIES 241 Dimensions & weights, Sectional Arrangement Minimum Service Height B
Ref
A
A
K
F
C
B
J
-
76
76
C
40
-
-
D
102
102
102
E
127
127
127
F
-
108
113
Ø
G
200
200
200
G Minimum for Service
H
-
165
275
D
4
1 1 1 ⁄2” - 1” ⁄2” - 1” ⁄2” - 1” No OPCO With OPCO With S.309 OPCO mm mm mm 100 100 100
H Minimum for Reset & Service
J
94
94
94
K
160
160
160
Wt - Kg
1.9
2.2
2.5
Sectional Arrangement Interchangeable Springs
Interchangeable Bodies
Safety Cut-Off Valve
3/4” NPT Vent Connection
Internal Relief Valve (Optional) Lightweight Cartridge Design Casing Assembly
Interchangeable Orifices Inlet Pressure
Outlet Pressure
Atmospheric Pressure
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.
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R.241-01.01.08