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let by test
let by test
Start Let By Test
1: Turn gas off connect a zeroed manometer to the test point. 2: Raise pressure to 7 or 10mb and turn valve off and test for 1min. 3: Make sure the pressure dose not rise more then 0.25mb. If it rise there is let-by at the emergency control valve is passing cheack with LDF (leak detector fluid). If let-by is confirmed Contact the gas supplier to repair on 0800 111 999. If it drops the installation may have a leak. If it sits ok, then move on to Stabilisation.
1: Raise pressure to 20mb to 21mb and turn off gas. 2: Give time 1min for temperature fluctuations. 3: A raise or drop in pressure may be ignored at this point as long as it dose not rise above 23mb. Remeber one minute is a minimum, you may need to let it stabilise for longer. If it drops steadily the installation may have a leak. If it raises there may still be let-by If it sits Ok, then move on to Tightness Test.
1: Now you can adjust the pressure back to 20 or 21mb and observe for 2minutes for a pressure drop. A DROP in pressure could be a leak. A small drop may be passed if its less then 0.25mb and there is no smell of gas or.. its not leaking in the pipework..and if its below 4mb with a U6 or G4 meter..Below 8mb with an E6 or no meter..Below 1mb with a U16 Meter. WITH NO SMELL OF GAS.
If there are gas pipes bigger then 28mm the drops are 2.5mb 4mb and 1mb to the respective meters.
Working Pressure at the meter
1. Turn One appliance on: 3 RINGS on Cooker or any other appliace on at FULL RATE. 2. Meter Working Pressure at the meter should be 21 +/-2mbar (i.e. betwean (19mb and 23mb). If it is outside this range the gas transporter should be contacted and asked to adjust or replace the meter regulator to give the correct reading.
Standing Pressure at the Meter
1. Turn the meter control valve On slowly 2. Meter Standing Pressure at the meter should be less than 30mb.
'Nice tool for New Gas Engineers 5 Star'
KenCo plumbing and Gas
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