Unbelievable gas leak

[newcastle phill]

7-10, 20-21

 

[Leo21]

What's that in inches?

 

[ShaunCorbs]

What's that in inches?

237 - 338 to 677 - 711 if my math is right

 

[Billy Bob Bob]

7-10, 20-21

yep,spot on

 

[Ermintrude]

Is this new or Old Testament

 

[Pssst]

This is a fairly common occurrence. Any deposits of powerflux or similar o an anaconda has the potential to nibble through within as little as a few weeks.

As stated, when TT be careful to avoid regulator lock up.

I will sometimes do a let by test, then slowly raise to an intermediate level,,say 15 mb and closely observe then raise to final test pressure of 20mb avoiding lockup.

Even so ,it is entirely possible to have a pin holed flex due to flux that will hold a correctly applied TT and will only leak intermittently.

Remember the flux is semi solid and can easily plug a pinhole and then if ambient conditions change (eg warm weather) ,the flux blob softens and it blips some gas out again.


Even squiriting with LDF needs care as it can sometimes wash away/soften flux blobs thus revealing a leak but it can also seal up the leak !

 

[REDSAW]

so you tell your customer; national grids equiptment has failed luv, their the ones responsible for it.

 

[Pssst]

True ,,it all creates valuable work and generates income..keep blobbing lads .

Only slightly relevant but nothing downstream of the ECV belongs to Grid or the transporter. If anything downstream of the ECV eg meter/reg is duff then transporter/grid may replace/rectify as long as there is a contract in place. This is then internally billed to the equipment owner kerching $$ keep blobbing..

 

[armourer]

You All seem to be forgetting the Anaconda is at 75mb (medium pressure) as its before the regulator.
Also the meter govenor is always in lock out if no appliances are in use.

Thats the reason you LDF the anaconda its the higher pressure.

 

[GrahamM]

You All seem to be forgetting the Anaconda is at 75mb (medium pressure) as its before the regulator.
Also the meter govenor is always in lock out if no appliances are in use.

Thats the reason you LDF the anaconda its the higher pressure.

Not during a proper tightness test it's not. As long as regulator is functioning correctly.
This is why tightness test is 20-21mb. Regulator should not lock up until 3-5mb above WP.
This then tests everything downstream of ECV. So there no requirement to LDF anaconda unless you have a drop and are tracing a leak.

 

[Captain.rick]

I only recently did my acs and they say i should ldf anaconda and if it lets by i could crack the nut and ldf inside!

I said why would i do that its not my responsability and they said well you dont have to but you could if you wanted to. I think thats wrong so inwont touch it anyway!

Ldf the anaconda was advised as a must

Maybe as it reached standing pressure it was enough to cause the leak?

 

[REDSAW]

you made it then? lol

I only recently did my acs and they say i if it lets by i could crack the nut and ldf inside!

think you would find thats a 'you could crack the nut and ldf inside, but the transporter wont like you doing so as it belongs to them' thsats because you cant do anything lawfully to it.

 

[Captain.rick]

Yep, pretty bloody pointless mentioning it to people in the class!
I wonder how many have actually tried it anyway

 

[GrahamM]

I only recently did my acs and they say i should ldf anaconda and if it lets by i could crack the nut and ldf inside!

I said why would i do that its not my responsability and they said well you dont have to but you could if you wanted to. I think thats wrong so inwont touch it anyway!

Ldf the anaconda was advised as a must

Maybe as it reached standing pressure it was enough to cause the leak?

Advised!
Comes down to personal preference I think.
Wasn't a requirement to do it on my ACS 5 years ago and I never have unless I have a drop and suspect Anaconda is compromised.
Also resat my ACS 3 weeks ago now and had question asked by my assessor.... after a successful tightness test carried out to standards are you required to LDF the Anaconda?
My answer was NO as tightness test was sound! Correct!

 

[noggin78]

I was always taught three sprays. One on the Ecv Union, one where the anaconda meets the regulator and one on the test nipple.

 

[The Goose]

You say they changed the anaconda but did they also change the governor? I am thinking that is more likely to have been the problem.

I have noticed they often have the anaconda sealed and attatched to the governor ready to be fitted and tend to just change both.
Its just I have come across the governors leaking and causing similar symptoms ie only leaking when they regulate the pressure so this does not show up in the tt.

There was a make of governor that was more prone to doing this and I think it was donkin or something similar.
As a result I pay a bit more attention to them! A bit of ldf round the bleed hole in the top might give you an idea if there is a problem. If you have it dismantled for any reason I seem to recall that they rattle if you shake them (if they are faulty).

 

[stevetheplumber]

taking the annaconda of and spraying inside is to check for let by on the valve

 

[Pssst]

Common pressure tiers are

0-75mb low pressure
75mb-2 Bar Medium pressure
2-7 bar intermediate pressure
above 7 bar..high pressure

You will rarely see anything like 75mb on a domestic service unless it is med pressure and it incorporates a single or two stage med to low pressure regulator,

Common standing pressures on low pressure services would be anything from around 24mb to 35mb but typically around 26mb.

 

[smitty1892]

B6 reg in Northern Ireland is let by ecv 16 mbar , 10 mbar let by reg and 19 mbar tt . There's so much back pressure which can hide a leak on gauge