Tightness Test Query

[stratplus]

Scenario:

Service/Cp12.

Tightness test, E6 meter with boiler and cooker.
1 mb drop found over 2 mins no smell of gas.
Acceptable drop.
Disconnected cooker, re-tested.
2 mins no drop.
Would you turn cooker off?
Or re-connect and just record the drop on the CP12 in the TT section.

 

[ShaunCorbs]

re connect and note on cp its in limits

 

[stratplus]

re connect and note on cp its in limits

Would you note drop is on cooker?

 

[ShaunCorbs]

Would you note drop is on cooker?

yea and recommend a change to owner

 

[firemant]

Why would you turn it off?. As a RGI you obviously know the requirements?

 

[SavageW]

I thought that if you found an acceptable drop on tightness test an no smell then just noted down,unless advised to investigate from customer.Once you’ve gone to isolating/disconnecting appliances you’ve then got to cap the supply an make sure no drop? I’d cap off supply to cooker personally an leave it up to them now you’ve proved it’s the cooker

 

[Harvest Fields]

I personally wouldn’t look for a permissible leak on an installation with no smell. You will end up shooting yourself in the foot.

 

[mfgs]

Now you have found the leak you need to cap the cooker, you know its leaking gas so its ID. There was no requirement to trace the leak as it was in the permissible drop and no smell of gas.

 

[stratplus]

Now you have found the leak you need to cap the cooker, you know its leaking gas so its ID. There was no requirement to trace the leak as it was in the permissible drop and no smell of gas.

That’s exactly what I thought. Because I had disconnected and found it to be dropping on the cooker. The permissible drop is alliances connected.

 

[ShaunCorbs]

only the same as cus removing it and cleaning behind

 

[Last Plumber]

It's 1 Mb on an installation with an E6.
Now that's tiny.

 

[firemant]

Scenario:

Service/Cp12.

Tightness test, E6 meter with boiler and cooker.
1 mb drop found over 2 mins no smell of gas.
Acceptable drop.
Disconnected cooker, re-tested.
2 mins no drop.
Would you turn cooker off?
Or re-connect and just record the drop on the CP12 in the TT section.

Why on earth did you bother. You can normally leave 8mb on an E6. Note the reading, move on. Don't give your punters unnecessary grief and urgent expense.

Frankly, if I had hired you, it would be the last time. And I would be asking questions.

 

[mfgs]

only the same as cus removing it and cleaning behind

Not at all. A customer removing a cooker via the bayonet and reconnecting totally oblivious to the fact that it is passing gas is one scenario. A trained professional with a duty of care to the safety of his customer knowingly leaving a leak/dangerous appliance connected to the supply and not following the unsafe procedures act is another.

 

[Last Plumber]

That’s exactly what I thought. Because I had disconnected and found it to be dropping on the cooker. The permissible drop is alliances connected.

Out of curiosity, what did you do?

 

[jtsplumbing]

It was my understanding that a TT is not a legal requirement when doing a CP12, provision is made on the cert but its not a requirement but we all do it !

 

[stratplus]

It was my understanding that a TT is not a legal requirement when doing a CP12, provision is made on the cert but its not a requirement but we all do it !

Out of curiosity, what did you do?

Bea

Out of curiosity, what did you do?

Bear in mind this post was only a scenario of correct procedures to adopt should this happen.
I would be curious as where the drop was and if found to be on cooker, because you have confirmed leak was on cooker you’d over ride the permissible drop and have to act accordingly.

 

[Last Plumber]

Because I had disconnected and found it to be dropping on the cooker

It sounded like we were discussing something you'd done!

Are you telling me/us that this was some made up exercise ?

 

[stratplus]

It sounded like we were discussing something you'd done!

Are you telling me/us that this was some made up exercise ?

I’m always thinking of things that you could come across. The what ifs.
Tbh the way I see it is if I had an acceptable drop of say 2mb with no smell of gas and a cooker was installed I’d be curious as to where it was. It takes seconds to disconnect a cooker from a bayonet.
Now, if I still had the drop after disconnecting i may or may not choose to isolate the boiler and re-test.
Now....if the drop was still there that would leave the meter or pipework.
I understand you can’t have any drop on the pipework so if after isolating the meter the drop was on pipework you’d have to trace and repair.
The original scenario was if a drop was found on the cooker.
Cookers could form leaks all over at worn taps etc and this is accepted which is one of the reasons you are allowed the permissible drop. (As I understand it).
So.. this is the reason for the original scenario.
Would it still be acceptable to re-fit cooker knowing there was a permissible drop OR now you’ve identified it should you isolate.
Totally understand the “why are you isolating with.a permissible drop” posts but like I said this is just a “scenario”.
Hope that makes more sense?

 

[Last Plumber]

Hope that makes more sense?

I don't suppose it does any harm to 'think'

Domestic tightness tests are simplified and generalised methods that are intended to be foolproof.

There is always the possibility that a leak which is classed as 'within tolerance' is actually dangerous.

Even so, 1 or 2 Mb drop on a typical domestic installation running on an E6 is well within the permitted leak rate and is highly unlikely to cause an issue.

 

[firemant]

The post quoted below suggests that you DID actually do the scenario.

Whatever, once you find there is a carcass leak you cannot ignore it. Do don't do it. IMO