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tightness testing

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expertgasman

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PostPosted: Thu May 12, 2011 11:54 pm Reply with quote

It would make more sense to remove the union of the ECV and test the ECV with LDF. If every installation had an anaconda, I suspect this would be the regs. If an existing leak was PRECISELY the same as the let by rate, no leak or let by would be apparent. If you see what I mean.

Once again, I suspect that I shouldn't post after an evening on Tim Taylors.
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bengasman

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PostPosted: Fri May 13, 2011 6:40 am Reply with quote

Aquilani wrote:
The Governor will lock out above 20 mbar so you will not be testing before this including the ECV.

That is new to me. I thought only mp meters lock out.
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hansthebear

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PostPosted: Fri May 13, 2011 3:27 pm Reply with quote

lock up
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bengasman

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PostPosted: Fri May 13, 2011 8:16 pm Reply with quote

hansthebear wrote:
lock up

Of course, force of habit. icon_smile.gif
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Jake1886

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PostPosted: Sat May 14, 2011 7:29 pm Reply with quote

1 minute at 10mbar to test if the ECV (emergency control valve) is letting by.
1 minute at 20mbar temp stabilization.
2 minute at 20mbar tightness test of the gas installation.

Out of interest lion08 which college will you be going too?
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adlplumbing

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PostPosted: Sat May 14, 2011 7:43 pm Reply with quote

Aquilani wrote:
The Governor will lock out above 20 mbar so you will not be testing before this including the ECV.

according to transco guy i know he says it can lock out after 18mb
thats why we spray the ecv pipe work to governor and governor it self
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ChrisR

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PostPosted: Sun May 15, 2011 12:01 am Reply with quote

The figures for the allowances were worked out from the amount of energy build-up you would get if there were an escape. It used to be part of BG's extended remit to get stuff like that tested, back in the day.
Anyone remember 20.75mbar test pressure?!
So no they aren't exactly arbitrary, which is why they're different for different meter & pipe sizes. If you work it all out, the domestic test turns out to be quite a strict one., though it doesn't seem that way when you watch an E6 drop 7mbar and have to decide what to do!
I find that only about 25% of reassessing rgis know enough about tightness testing and gas rates, which is pretty damning. I don't mean not knowing all the numbers, they can be looked up, I mean not knowing what the numbers depend on. Normally we ask enough leading questions that they work it out.
We had one guy, an old git like me, who said he did a combined let-by and tightness at 15mbar or so, and that was good enough. I asked him 3 times, same answer. That'll be a FAIL then icon_rolleyes.gif . He protested that I'd stopped him working. Yup, that's the idea, mate.

ADL wrote:
according to transco guy i know he says it can lock out after 18mb
thats why we spray the ecv pipe work to governor and governor it self
I didn't know it could be 18, but he's probably right. They can also lock up if the gas goes backwards.
I know the book says to spray the anaconda, but I protest, cos I've been caught out a couple of times! If eg the anaconda gets flux on it, it'll split, and the gas pours out. So you faff about trying to get your 20mbar, until you lock the thing up. Release the gas slowly and stop at 20mbar, it stays locked up and you do your test. Ok so now you spray the anaconda. But all the gas WENT half a minute ago, through the gert big split, so you see nothing. Of course it stinks, but you've had the test point open, so that's normal.
Even if you're quick, the rate the gas comes through the split is so high it just blows the LDF out of the way - no bubbles. You have to go up and down the anaconda with a handlful; of LDF, with the gas on. Then you'll either see bubbles at the end of your grip, or you'll feel it, it''ll be COLD!

Just in case any diyer is wondering - no this is NOT enough information to check for escapes - don't even think about doing it yourself.
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Agile

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PostPosted: Sun May 15, 2011 12:04 am Reply with quote

Insomnia Chris?
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commercialman

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PostPosted: Sun May 15, 2011 12:36 am Reply with quote

ChrisR wrote:
We had one guy, an old git like me, .


Did you know getting old is frowned upon when working in the gas industry? , some would say you're past the sell by date. icon_mrgreen.gif
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bengasman

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PostPosted: Sun May 15, 2011 6:12 am Reply with quote

ChrisR wrote:

...I find that only about 25% of reassessing rgis know enough about tightness testing and gas rates

icon_eek.gif
I'll admit that I still have to double check which calculation is for what when it comes to net and gross derivation from a meter reading, but it is shocking that there are guys out there that don't understand how to do the basic tests.
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namsag

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PostPosted: Sun May 15, 2011 6:22 pm Reply with quote

as basic as it gets and already up to 3 pages in combustion chamber. tut tut
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commercialman

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PostPosted: Sun May 15, 2011 9:16 pm Reply with quote

namsag wrote:
as basic as it gets and already up to 3 pages in combustion chamber. tut tut


icon_eek.gif icon_mrgreen.gif ....................might join the idiot sorry combustion chamber again if not for a laugh.....................


Last edited by commercialman on Sun May 15, 2011 11:08 pm, edited 1 time in total
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algas (16 May 2011)
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commercialman

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PostPosted: Sun May 15, 2011 9:19 pm Reply with quote

Namsag , i thought you disbanded from the combustion chamber?
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namsag

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PostPosted: Mon May 16, 2011 6:19 pm Reply with quote

Na i read it and according to some i post under 6 different names in it icon_wink.gif
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LeeC

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PostPosted: Mon May 16, 2011 8:50 pm Reply with quote

It's bloody embarrassing.
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