WorksheetsTightness Testing Quiz
Total questions: 5
Worksheet time: 3mins
Several of the tests that may be undertaken when tightness testing specify the pass criteria as ‘No Perceptible Movement’, when testing with a suitable electronic gauge accurate to two decimal places this means a gauge movement of:
0 mbar.
Less than 0.25 mbar.
Less than 0.5 mbar.
Less than 1.0 mbar.
What is the MAXIMUM permissible pressure drop during the tightness test on an existing natural gas installation consisting of a U6 (diaphragm) meter, a maximum pipework diameter of 22 mm, a volume of 0.008 m³, appliances connected but not isolated and no smell of gas?
0 mbar.
2 mbar.
4 mbar.
8 mbar.
What test medium may be used when testing a new installation before it is connected to a live natural gas supply?
Air.
Nitrogen.
Carbon Dioxide.
Liquefied Petroleum Gas (LPG).
If, after the completion of a satisfactory tightness test, a smell of gas occurs around a lit appliance but disappears when the appliance is turned off the gas operative should:
Contact the Gas Safe Register.
Notify the Health & Safety Executive (HSE).
Check pipework downstream (on the outlet) of appliance control taps, flame supervision devices, etc. with leak detection fluid.
Contact the Emergency Service Provider (ESP) in order that they can check the service pipe upstream (on the inlet) of the gas meter / emergency control valve for gas escapes.
When carrying out a tightness test on an installation supplied through an electronic token meter (ETM) the gas operative must ensure great care is taken to prevent the:
Gas pressure from falling below 24 mbar.
Anti-tamper device on the meter activating, shutting off the supply to the installation.
Anti-tamper device on the regulator activating, shutting off the supply to the installation.
Anti-tamper device on the regulator activating, increasing the pressure to the installation.
