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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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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.241-01.01.08