Operating Pressure at meter

[y22edy]

what was the standing pressure at the meter with no appliances running?

 

[Reg Man]

Why is everyone hung up on standing pressure as long as it locks out below 30mbar all ok, read my previous post, standing pressure has little relevance to working pressure.

 

[yorkieplumber]

agree with Reg Man, standing pressure means nothing, lots of people on here are getting mixed up with standing pressure and operating pressure, sick of explaining it all over again, just read my previous posts on the matter.

 

[Reg Man]

Thanks Steve: The lesson of the day: read post number 11 on this thread. It explains every thing you need to know about regulator pressure and standing pressure.

 

[gas57]

if you havent got 19mbar/23mbar at gas meter regulator then incoming gas pipe is blocked or under sized its transco property they have to sort it out

 

[yorkieplumber]

Thats what i said in my first post, glad you agree gas57.

 

[gas57]

had this my self on a job i was doing transco came out it was gas pipe in drive way that had been crushed they run a plastic one then it was ok

 

[stuartmac]

Hi mate, a few thoughts, did you test another appliance? may have given a standing pressure! if the cooker is only 16mbr then it surley is ID? if you had carried out a tightness test then you would have established the pressure in the system and acertained that the regulator was not correct, if you have none of these then it can either be a borken cooker or your pipes are wrong, however it looks like you have left an appliance which is providing incomplete combustion aqnd is a danger I hope it wasnt? hope that helps cant think of anything else it could be unfortunatley you cant help with any other pressures.

 

[yorkieplumber]

stuartmac please read earlier posts, not been funny mate but you need to check the way you carry out your gas work, and you seem to get mixed up between STANDING PRESSURE and OPERATING PRESSURE, check your corgi manual, and the previous posts on here,

Steve.

 

[Reg Man]

Stuartmac, I do not mean to be disrespectful, but you seem to have some problems understanding this thread or you have become extremely confused over the basics of standing pressure and working pressure testing. Please look at post number 11. the issue is not caused by any of the appliances or pipework within the property. It is a supply problem which has been identified by Yorkieplumber, from proper testing at the gas meter. Incorrect pressure on the inlet results in incorrect pressure at the appliances. Correct working pressure on the incoming supply, correct pressure at the appliances.

Although all opinion is valued, It is not good to read inaccurate advice on this forum as it looks like from the outside that none of the proffesionals can agree about the very basics of gas engineering. I am not going to boast about my own experience in the gas industry but can assure you that my credentials are sound and I my posts on this thread can be authenticated for accuracy in all of the relevent British standards and Regulations.

 

[anothergit]

Did yo uever resolve the pressure problem, Sounds like you had either a faulty regulator or a incorrectly sized incoming/blocked incoming supply.

Oh all of you TRANSCO don't exist anymore! It's either National Grid Gas, Southern Gas networks or one of the other national gas emergency service provider. Saying TRANSCO now is like me telling a customer to get a Corgi Fitter instead of a gas safe registered one.

Even on an old distribution system the pressure in the gas main would be aronud 24-26mb in the summer and around 30mb in the peak winter demand, so i was told by an engineer and from my experience working on the gas mains. Safe operation of gas appliances is essential although they don't have to gaurentee 20mb at the meter what use would ther gas company be if we couldn't use gas appliances safely.

And yes some people out there do need to revise the regs, 8mb drop on a U6/G4 i think not!! an E6 yes only if there is existing pipework and appliances attached and no smell of gas. An E6 has a 4mb permissable drop but only if there is no smell of gas and the pipework is old/existing with appliances attached. Obviouly all new pipework there is no permissable loss of pressure.

 

[GQuigley67]

interesting and quite funny thread, how have I never came across this one before ? Did you get your problem sorted ?

 

[yorkieplumber]

Hi, yes i got the problem fixed by the gas suppliers after i dug my heels in, and i agree with what you say about permissible pressure loss and dont think i said any different to that on any earlier posts, what i would like to know though if gas supplier can not guarantee you 21mbar at meter what chance have we of fitting appliances safely?

Did yo uever resolve the pressure problem, Sounds like you had either a faulty regulator or a incorrectly sized incoming/blocked incoming supply.

Oh all of you TRANSCO don't exist anymore! It's either National Grid Gas, Southern Gas networks or one of the other national gas emergency service provider. Saying TRANSCO now is like me telling a customer to get a Corgi Fitter instead of a gas safe registered one.

Even on an old distribution system the pressure in the gas main would be aronud 24-26mb in the summer and around 30mb in the peak winter demand, so i was told by an engineer and from my experience working on the gas mains. Safe operation of gas appliances is essential although they don't have to gaurentee 20mb at the meter what use would ther gas company be if we couldn't use gas appliances safely.

And yes some people out there do need to revise the regs, 8mb drop on a U6/G4 i think not!! an E6 yes only if there is existing pipework and appliances attached and no smell of gas. An E6 has a 4mb permissable drop but only if there is no smell of gas and the pipework is old/existing with appliances attached. Obviouly all new pipework there is no permissable loss of pressure.

 

[huddster]

reading those four pages was like watching a bad film, but you carry on watching to see how it ends, i think the moral of the story here is-

1-know what you are talking about before giving advise

2- RTFQ......................(READ THE F**KING QUESTION!!!!).......................................simples!

 

[AWheating]

Lol. True that!

 

[Nat]

I want to hear what stuartmac has to say about this. Legend!

 

[Dannypipe]

My guess is that stuartmac has run for the hills. I hope he did, he was baking my head.

 

[Gray0689]

My guess is that stuartmac has run for the hills. I hope he did, he was baking my head.

He was being an idiot

 

[tamz]

what i would like to know though if gas supplier can not guarantee you 21mbar at meter what chance have we of fitting appliances safely?

Appliances are built to work safely within a tolerance hence when something is more than a 1mb drop it is only ncs.

Think this one through.
The gas supplier only needs to guarantee you 12mb at the inlet (it will never happen) but the usual minimum is 19mb.
If the meter is near capacity (6m³/hr) then there can be a 4mb absobtion across the meter, 1mb drop on the pipework. 1½mb across the gas valve so at 19 supply your boiler is getting 13½mb
Do the math at 12mb supply

About 6 month ago i did a boiler swap, worcs 30si fitted under the stairs, 2m from the meter.
Fired it up and was tidying the place up, heating bouncing, had run the hw but not checked flow rates but it seemed fine. Filling out the paperwork and doing the checks, 5mb at the boiler 6 at the meter
Rung SGN and turned out it was water in the service but the point is, it was working fine.

Zpgv

 

[pobsdad]

Had some bad floods round here a couple of years ago,followed by a spate of gas mains full of water.How water gets into the mains,I have no idea!We had quite a few gas meters with water in them,somehow.

 

[anothergit]

You get water in an old the cast iron and steel system because of corrosion, simple fact is when you get a hole in the gas pipe water will eventually get into the mains, If there is enough water in the ground it will eventually fill the main or service. And as gas is consumed it gets pulled into the meter etc where it will pool and in severe cases make it to the appliances. On old cast main and services there are sometimes syphons to extract the water from.

It can be a real pain in the backside to find the source sometimes.

A broken water main will simpley burst a hole through gas main if they are laid close enough and fill it with water cutting of whole streets, that's a major headache.

 

[tamz]

There have been 2 cases of that in Edinburgh in the past few years. The water even made it up into 2nd floor meters.

 

[Billy Bob Bob]

just read trough this lot pmsl

 

[tamz]

Some beauties lol

 

[GQuigley67]

I have made the genuine mistake before about replying to posts without reading the OP carefully and ended up making a howlin C of myself although not as bad as this i hope