Quick one on gas tightness/let tests

[PrenticeBoyofDerry]

If you are testing a domestic at 10mb for 1 min and 20mbr for 2 mins and proves to be satisfactory with no drop.
What if say (I know it is not the done thing) the manometer remained in place for a further 3-4 mins and there was evidence of a pressure drop?
Would it still be satisfactory (which I doubt) of further investigation required.
In essence how long would you expect a manometer to hold pressure on a tightness tests?

 

[Dan Robinson]

Where's your stabilisation?

 

[Dan Robinson]

Double post.

 

[PrenticeBoyofDerry]

Where's your stabilisation?

You mean the 1 minute between each test, say that the stabilisation had proved satisfactory.
Would you expect a drop of pressure with no differential temperature changes in either the gas or the location, if the U-gauge had been left in position after satisfying the test procedures in Section 6 of corgi's essential gas safety (domestic) 7th edition?

 

[TCCHeating]

Why are you bothered? if it passes the test after 2 mins then simply take the guage off and stop worrying!

 

[gas112]

The test for standard domestic is 4 minutes not 6, 7 8 or 9 so what ever it does after the test period is not part of the test and as such would not need to be acted on

 

[stardanny]

Err, should this be in Combustion Chamber?...

Daniel.

 

[Dan Robinson]

The OP is learning so can't get in.


This one is sailing close to the wind though .

 

[PrenticeBoyofDerry]

Err, should this be in Combustion Chamber?...

Unfortunately I do not meet the criteria that is set to join the CC forum, but I do not think forum rules disqualify my topic/post/question from being published.

 

[PrenticeBoyofDerry]

The OP is learning so can't get in.

Indeed I am and although I have asked the gas engineer supervising and my course tutor regarding this. I have been given conflicting answers and wanted to put it to a wider audience.

 

[gas112]

The only thing you would act on is if there was any smell of gas
So what has been the conflicting advice by the two of them

 

[Dan Robinson]

the conflicting advice by the two of them

Welcome to our world.

However, the test duration is just that. Who's to say what happened in the subsequent minutes? If you returned to find the drop you would re-test.

That would be for the prescribed time period, which based on your supposition was fine so job done.

 

[Biggles..]

If the CC lets retired and no longer registered engineers in then surely there should be allowance for genuine apprentices.
Maybe this is something for admin to look into?

 

[roguetrader]

I agree with Lee, if you are a genuine apprentice/improver then the CC is a massive resource.

 

[PrenticeBoyofDerry]

if you are a genuine apprentice/improver then the CC is a massive resource.

I am currently completing my studies for the ASC exam.