Let-by or is it?

[Doodlebug]

Thought I'd share this as its a strange one. When I was working with Transco years ago I had a call out for let-by. When I arrived at the job I was met by an engineer claiming in all the years he'd been in the game he'd never seen let-by as bad as this. I attached my gauge and sure enough after turning the ECV off at 10mb the gauge continued to rise and rise and rise. I removed the anaconda from the ECV and bubbled the ECV which I found to be bottle, not letting by at all.
I will leave this with you to see who can come up with the correct diagnosis of what was happening.


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[TBServices]

Thought I'd share this as its a strange one. When I was working with Transco years ago I had a call out for let-by. When I arrived at the job I was met by an engineer claiming in all the years he'd been in the game he'd never seen let-by as bad as this. I attached my gauge and sure enough after turning the ECV off at 10mb the gauge continued to rise and rise and rise. I removed the anaconda from the ECV and bubbled the ECV which I found to be bottle, not letting by at all.
I will leave this with you to see who can come up with the correct diagnosis of what was happening.


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Bright sun shining on the meter and pipe work?


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[Doodlebug]

Bright sun shining on the meter and pipe work?


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Nope, this rose steadily from 10mb to 20mb in the space of about 5 seconds.the meter is inside the property.


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[Doodlebug]

Do t think anyone will get this, it's a tricky one and only ever come across it once. I will give a clue later.


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[mountainman]

The property was pinching gas from next door?

 

[Doodlebug]

The property was pinching gas from next door?

Nope lol


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[Doodlebug]

Clue is..... It was a new meter fitted recently.


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[galaxy_plumbing]

seized regulator, so no gas through ? just a guess 😀

 

[galaxy_plumbing]

or blank disc in the meter

 

[chris watkins]

Meter round the wrong way

 

[Doodlebug]

Neither of the above. Do you give up?


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[mountainman]

My last try then.
Assuming the meter isn't fitted in a lift.

Faulty manometer or tube

 

[Doodlebug]

The answer is........ The test nipple had some factory grease inside it, I simply cleaned with a small piece of wire and it was fine. Does make you think though, the engineer who fitted the meter obviously didn't do a test.


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[dave1]

I've had a few of these doodlebug, always carry a safety pin in the bottom of my bag now.

 

[Doodlebug]

I've had a few of these doodlebug, always carry a safety pin in the bottom of my bag now.

Have you really mate? I've only ever found this once. Do you fit meters or are you finding meters that obviously haven't been tested?


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[dave1]

I carry out servicing and breakdowns for a H.A, yeah found 3 that I can think of the top of my head.

 

[chris watkins]

The answer is........ The test nipple had some factory grease inside it, I simply cleaned with a small piece of wire and it was fine. Does make you think though, the engineer who fitted the meter obviously didn't do a test.


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Don't quite understand how it wasn't found straight away, how did they drop the system pressure down to 10 without noticing nothing came out of the test nip ??

 

[Doodlebug]

Don't quite understand how it wasn't found straight away, how did they drop the system pressure down to 10 without noticing nothing came out of the test nip ??

Thats a very good point mate, assuming they did a test before breaking into any gas pipes, it would have taken an age to drop the pressure down to 10mb. I never asked, I just got called for let-by and found grease in the test point.


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[scorps]

the first let-by i reported 25 yrs,or so, ago the engineer said it will be grease always is,he was right,once he showed me how to clean the nipple with a pin iv,e not had to ring transco since

 

[scorps]

Thats a very good point mate, assuming they did a test before breaking into any gas pipes, it would have taken an age to drop the pressure down to 10mb. I never asked, I just got called for let-by and found grease in the test point.


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it,s usually flux from the plumbers meter union