Gas Pressures Advice - Confused

[fireplace_man]

Hello, i am GSR fiter, after some more advice. I fitted a gas fire today, the standing pressure at the meter is 18mbar, working pressure at meter is 18mbar. The inlet pressure at the fire is 17mbar.

Thats a 1 mbar drop so when the standing pressure is adjusted it should be ok? do i just get the gas transporter out to sort it out. Do i have to be there? Never needed to call them before. Any advice? Do i have to return after they have been to commision everything?

The gas is off at the house at the mo as its empty.

Thanks

 

[Simon F]

I think you are answering your own questions really,
as the pressure is out of the set limits then yes you need to get the gas transporter involved. had similar with a job I was assisting on a few months back, called the national grid, guy arrived about twenty minutes later swapped the regulator - job done
they will only want to correct the supply pressure issues, they wont commission the fire for you

 

[CES]

Are you sure that's the inlet pressure or is it the cold setting pressure of the fire?
The Gas transporter isnt concerned with the downstream, only what the meter is doing, they might adjust it up or it could have been down to heavy usage at certain times of the day? I would go back when you know the incoming pressure should be higher and check it again, if its constantly 18mb you could ring them and see what they say...
If you still have a 1mb drop then you'll need to look at the pipework

 

[kirkgas]

a couple of questions
did you gas rate the fire and do a visual inspection of the flame picture? (it has been know for a test point to be partially blocked, which effects the gas at the u guage but isnt affecting the safety of the fire)
what pressure is required at the fire? a lot of fires only need 17 so if it was 17 you could have fully commissioned it
did you do a TT at 18 (with gas) or pump it up to 20 and test with gas and air, this perfectly acceptable and as you would have had to purge the install whatever you did i wouldnt have added anythig to the time on the job

 

[gasmarc]

Yes good point Kirkgas I have come across that before a block test point

 

[jtsplumbing]

Sounds like you have a faulty govner on meter ! had it loads of times, get them to replace it.:yes:

 

[fireplace_man]

Hello, well i tested it again, nothing was blocked. The inlet pressure at the fire should of read 20mbar +/- 1mbar. National grid turned up an hour after my call, governer changed and all is sorted.

 

[Atouchofgas]

Glad that everything was sorted out, have had SGN out a few times on various jobs, got talking to the guy, who told me that they have a list of regulators that are dodgy ie seats falling of and giving weird readings, also ones that start leaking gas nice to know

 

[fireplace_man]

Yes i spoke to the bloke who came out, first time ive ever called them out, so wanted to check i wasnt being stupid. He was telling me about certain areas in the town i was in having poor pressures and most governers having faults. He didnt even test the regulator on the job, just said it looks knackered so changed it. Sorted.

 

[Halesowen1]

If you still have a 1mb drop then you'll need to look at the pipework

Why??
1mb drop is allowed, 18mb working pressure at meter then 17mb at fire.

 

[Halesowen1]

did you gas rate the fire and do a visual inspection of the flame picture? (it has been know for a test point to be partially blocked, which effects the gas at the u guage but isnt affecting the safety of the fire)

If the fire test point was blocked what difference would that have made?
He is not doing anything wrong with having a 1mb drop from meter to fire working pressures. Its the low pressure to start with at the meter so this has nothing to do with a blocked test point on a fire.

 

[Atouchofgas]

Yes 1 mbar drop is allowed but not when it's outwith the range of 19-23 mbar, which clearly indicates a prob with the incoming supply

 

[Halesowen1]

Yes 1 mbar drop is allowed but not when it's outwith the range of 19-23 mbar, which clearly indicates a prob with the incoming supply

Yes I know this, as I said it is a problem with the governor or supply to meter, but nothing at all to do with a blocked test nipple on the fire.