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1.1.2 Leak Test Procedures
Leak Test Procedure - to be carried out before the pistol is used:
Make sure all the hoses are connected correctly and gauges are in good working
order.
Fit the leak test nozzle 1260 on to the pistol.
Switch on extraction.
Open gas cylinder valves.
Open the regulators to the standard operating pressures.
Open fully the gas valve on the pistol.
Set the regulators to the required working pressures.
Close the cylinder valves and screw out the regulators.
Watch the cylinder pressure gauges on the oxygen and fuel gas for approximately 5
minutes.
If the cylinder input pressure gauge drops then there is a leak between the cylinder
and the regulator. Use a leak detection spray or liquid to identify, then rectify leak
before using the pistol.
If the cylinder output pressure gauge drops then there is a leak between the regulator
and the nozzle. Use a leak detection spray or liquid to identify, then rectify leak before
using the pistol.
If no movement of the pressure gauges is seen then the system has no identifiable
leak and is safe to use.
To release pressure, release the fittings on the exit of the flashback arrestors. Then
re-tighten.
Remove the leak test nozzle and replace with the standard nozzle assembly
Alternatively:
Carry out first 7 points, then:
Using a proprietary leak detection spray or liquid check all hose and accessory
connections and pistol valve assembly mating faces.
If a leak is detected however small it must be rectified before the system is put into
operation.
Turn off the gases and close the pistol valve. Carefully undo the gas fittings to release
gas. Ensure fittings are re-tightened.
Results:
Cylinder Input Pressure Gauge Drops
– There is a leak between the cylinder and the regulator
Cylinder Output Pressure Gauge Drops
– There is a leak between the regulator and the pistol.
Summary of Contents for MK 73
Page 1: ...Page 1 of 64 ssue 21 11 11 ...
Page 43: ...Page 43 of 64 SECTION 5 FAULT FINDING 5 1 Troubleshooting 5 1 2 Flowmeter Troubleshooting ...
Page 58: ...Page 58 of 64 SECTION 8 INFORMATION TABLES 8 1 Flowmeter Settings 8 2 Nozzle Selection Chart ...
Page 61: ...Page 61 of 64 Notes ...
Page 62: ...Page 62 of 64 ...
Page 63: ...Page 63 of 64 ...