GAS PURGING EQUIPMENT

Gas Purging Equipment

Procedures for the soundness testing and purging of industrial and commercial installations are set out in IGE/UP/1 and IGE/UP/1A, published by the Institution of Gas Engineers. We sell this publication, it can be found by clicking the following link: Publications. This document effectively replaces the previous British Gas plc documents lM/2 and lM/5.
Products mentioned in this document which are available on this website are as follows:


1	Flame arrestors. See below.
2	Reinforced hose. See below.
3	Pressure gauges, water and high specific gravity manometers.Click the following link: Pressure Gauges
4	Gas meters. The procedures recommend that the rate of flow of gas is maintained continuously above a calculated level. To monitor this a meter which can give the instantaneous flow rate is ideal. The turbine gas meters (with LCD display) are ideal for this purpose. Alternatively a diaphragm meter can be used together with a timing device: this does not however give an instantaneous flow rate.
5	Gas ball valves, these can be found by clicking the following link: Full Bore Gas Service Ball Valves
6	Continuity bonds. See below.
7	Expanding Plugs. Click the following link: Expanding Plugs


TYPICAL PURGING ARRANGEMENT - WITH GAS NOT FLARED
This illustration represents a typical arrangement ONLY - details may vary. Please confirm requirements prior to placing your order.

Qty	Description	Part No.
1	Purge hose 1"	9636	See below
1	Full bore gas service valve 1"	6125	Click here
2	Reducing elbow 1"x 3/4"	6374	Click here
1	Sample point (Fulham nozzle)	6252	Click here
1	Flame arrestor 1"	8973	See below
1	Gas meter	10446	See below
2	Extended nipple 6" x 1"	9799	Click here
1	Equal tee 1"	6394	Click here
1	Reducing tee 1" x 1" x 1/2"	8370	Click here
1	Reducing bush 1/2" x 1/4"	6419	Click here


PURGE LINES
Plain Hoses

Polyester reinforced clear PVC hose in 30 metre coil, with no fittings attached. Not suitable for the continuous passage of gas. Maximum pressure 3 bar.

Part No.	Description	Unit Price	Qty
9637	1/2" bore, 3/4" (19mm) OD, x 30M	£20.46
9638	3/4" bore, 1 " (25mm) OD, x 30M	£36.41
9639	1" bore, 1.1/4" (32mm) OD, x 30M	£54.56
14860	1.1/2" bore, 1.3/4" (46mm) OD, x 30M	£103.95


Loose Unions for Plain Hoses

BSP taper male unions which may be attached to the plain hoses shown above using a hose clip, which can be found by clicking the following link: O Clips and Stainless Steel Hose Clips.

Part No.	Description	Unit Price	Qty
11641	1/2" BSP T M union for 1/2" bore hose	£2.89
11642	3/4" BSP T M union for 3/4" bore hos	£4.20
11643	1" BSP T M union for 1" bore hose	£7.79


Assemblies

Reinforced flexible hose assemblies made with polyester reinforced clear PVC hose. Union connection at each end to ease connection to the pipework. Not suitable for the continuous passage of gas.

Part No.	Description	Unit Price	Qty
9634	1/2" bore x 6 M -1/2" BSP T M union x 1/2" BSP T M union	£13.76
9635	3/4" bore x 6 M - 3/4" BSP T M union x 3/4" BSP T M union	£17.14
9636	1" bore x 6 M - 1" BSP T M union x 1" BSP T M union	£27.30
10909	2" bore x 10 M - 2" BSP T M union x 2" BSP T M union	£175.69


FLAME ARRESTORS FOR PURGING & VENTING

These light duty end-of-line flame arrestors (also known as safety vents) are suitable for purging and venting gas lines - Natural Gas and LPG. Do not use hydrogen or refrigeration gases. They are safety devices only. They are designed to prevent flashback, and to contain or extinguish a flame where the gas being purged or vented could be accidentally ignited. They are essential safety equipment for the protection of plant and personnel from risk of fire and explosion. They have zinc alloy pressure die-cast housings and stainless steel 316 arrestor elements and are fitted with aluminium weather hoods. Flame tested to BS 7244: 1990. To BS EN 12874:2001.

Part No.	Description	Unit Price	Qty
8970	1/2" BSP female thread	£63.21
8971	3/4" BSP male thread	£57.88
8973	1" BSP male thread	£90.29
8974	2" BSP male thread	£155.12


DIAPHRAGM PURGING METER

A robust diaphragm meter with cast aluminium body and support bracket. Weather resistant. Because of the above qualities it is suitable as a diaphragm purging meter. It must nevertheless be handled with reasonable care - the internal mechanism is still delicate. Maximum flow rate: 6 m³/hour. Working pressure: 0.5 bar maximum. Weight: 3.7 kilos. Size: 282 mm high, 198 mm wide, 155 mm deep, 130 mm centres. Supplied with unions to give 3/4" BSP T male inlet and outlet.

	Part No.	Description		Unit Price	Qty
	10446	Purging meter		£59.85


CONTINUITY BOND, TEMPORARY

Temporary continuity bonds to be used when disconnecting or reconnecting pipework in circumstances where a spark could cause a hazard. These bonds meet the specification recommended in BS 6891 : 1998 Specification for installation of low pressure gas pipework of up to 28 mm (R1) in domestic premises (2nd family gas). The cross-sectional area of each bond is not less than 10 mm² of at least 250 V rating.

	Part No.	Description		Unit Price	Qty
	8750	For pipe diameter: Up to 28 mm Length: 4 feet Method of securing: Crocodile clips		£9.90

	Part No.	Description		Unit Price	Qty
	8717	For pipe diameter: Up to 75 mm Length: 4 feet Method of securing: 10" long chains		£13.45

	Part No.	Description		Unit Price	Qty
	8718	For pipe diameter: Up to 300 mm Length: 25 feet Method of securing: 40" long chains		£37.02

	Part No.	Description		Unit Price	Qty
	20332	For pipe diameter: Upto 42 mm Length: 2100 mm Method of securing: Crocodile clips.		£7.74