Low/ No Gas pressure...please help

[jtsplumbing]

Hi Sara, sounds like you are splitting the house into 2 seperate flats ! so would be good idea to have own Meters, Did your fitter run a new gas pipe from the Meter ? or has he connected onto excisting pipes in the house ?? maybe he as not had a lot of experience, but please make sure he has is own gas safe number, if he is working for someone else he will not be coverd out side of work, Please be very careful you could invalidate your house insurance.

 

[sara275]

right, i've just had a chat with him and i have more info:

1. the pipe is connected from the meter and the total run to the boiler is about 15metres (5meter up, 5 meter across outside and 5 meter inside property to the boiler)

2. About 10 meters of pipe is 10 meters and then it reduces to 22mm for the last 5meteres to the boiler.

3. The pressure at the boiler is 21mb. The problem arises when the boiler is switched on. When it is on, the gas pressure drops very low.

Is the bigger meter size (i think you said U16) domestic or commercial?

thanks again

Sara

 

[tweakyboy]

So your standing pressure at the boiler is 21mb, what is the working pressure?

2. About 10 meters of pipe is 10 meters and then it reduces to 22mm for the last 5meteres to the boiler.

I hope that is a typo above and the fitter hasn't used 10mm!

Are you able to post a picture of the installation?

Is the bigger meter size (i think you said U16) domestic or commercial?

A U16 meter is a large domestic meter, but your gas supplier will work out what you need.

What gas appliances do you have installed and do you know the outputs of them?

 

[mountainman]

Rather than clutching at straws Sara, if as you say you had a GSR do the installation; why not get a Gas Safe inspector over to look at it and give you a definitive report.
If you didn't get a proper GSR then don't whinge if we think you might have been foolish and say so.

 

[sara275]

sorry, it was a typo

2. About 10 meters of pipe is 28mm and then it reduces to 22mm for the last 5meters to the boiler.

working pressure drops to zero when boiler is switched on. Before boiler switch on, the pressure is 21mb

thanks

So your standing pressure at the boiler is 21mb, what is the working pressure?



I hope that is a typo above and the fitter hasn't used 10mm!

Are you able to post a picture of the installation?

 

[Millsy 82]

What make and model are both boilers? Will it work if the other boiler is not running? I have worked in a block of 4 flats which runs off a domestic meter and has sub meters (additional for each flat) and the boilers would run when all were on so although you may need a bigger meter it probably wont stop it firing up unless other boiler is running.

To me it sounds like pipework is undersized/Blocked/squashed I have seen all 3 when working it only takes a careless plasterer to get a good lump of plaster in a pipe or somebody to drop something on a pipe to kink it stopping the gas from coming through. You might have an inexperianced gas man but it could be something else I would check them out just for peace of mind but if it is 1 of the last 2 it could happen to anybody. (I now always solder cap ends on to stop plasterers filling the pipes)

Do you know where they have taken the gas pipe from if it was me I would run a seperate feed from near the gas meter or put a good sized pipe from meter until they tee off.

 

[M.Joshi]

2. About 10 meters of pipe is 10 meters and then it reduces to 22mm for the last 5meteres to the boiler.

I believe she meant 28mm?

 

[AWheating]

FYI, its a qualified gas safe so called "professional" who has landed me in this mess in the first place!! I am now stumbling on forums for answers.

If you have nothing useful to add, please stay off the thread! That goes for any other frustrated, hater too! Jees!

dont get knarked about a sensible answer. If you re-read your original post you stated we this and we that, so it is easy to take that "we" as you and somebody else (following the common use of the word).

You did not mention that we ment your gas safe registered engineer and yourself. It sounds like the engineer you have is an idiot and does not know what he/she his doing so my original answer still stand in essence get another engineer to sort it out and dont pay the original engineer untill all is sorted out.

 

[AWheating]

btw it sounds like the problem is at the meter or the incomming main, easy to discover this if you are a competent engineer, which yours seem not to be.

 

[diamondgas]

Hi sara :welcome: to the forum

You're guy needs to check the working pressure at the meter with the boiler on! dropping to zero at the boiler I'd say he's got a blockage somewhere!! A U6 meter will supply about 64kW/hr ... Your guy if he's GSR will know all this. If he's running just the one boiler and the inlet is dropping to zero then he's got a restriction somewhere IMHO! Putting a bigger meter in wouldn't make a hapworth of difference if that's the case