National Grid

[ShaunCorbs]

How you getting on jay ?

 

[jaydebruyne]

Because it forced combustion (fan driven). I wouldn't be too hasty with the loss across installation as 2mb from meter to gas valve test point is permitted (potential 1.5mb loss from appliance iso to gasvalve if I'm not mistaken). Almost certainly undersized service pipework probably been inserted with serviflex, they use 16mm most of the time and it's way too small. When you next bump into a NG engineer ask for an ecv test point. It allows you to take a working pressure before the regulator and proves beyond doubt what the issue is. Last time I spoke with the grid they said as far as they go is turning a tap on or turning on a room stat if not a combi, they dont put appliances in forced max rate. Hope this helps.

He didn't have any ecv test points :/ supply pipe is inch an quarter. He tested next door and they have no issues.

He said NG will not bother with low pressure calls unless pipework to appliances are correct. So will have to do a new 28mm run and retest, if same issue they'll have to sort the issue out themselves.

I'm surprised they put a 9m 22mm run to a 40kw boiler though

 

[ShaunCorbs]

He didn't have any ecv test points :/ supply pipe is inch an quarter. He tested next door and they have no issues.

He said NG will not bother with low pressure calls unless pipework to appliances are correct. So will have to do a new 28mm run and retest, if same issue they'll have to sort the issue out themselves.

I'm surprised they put a 9m 22mm run to a 40kw boiler though

That's utter bollox telk them to sort there side out first working pressure of 10mbar and under isn't acceptable and doesn't matter what size output pipe is still be the same

 

[jaydebruyne]

How you getting on jay ?

NG said nothing they can do until the pipework to boiler is corrected. Service pipework is 1.25 inch. He put on a new meter and tested but same issue. Gotta do a 28mm run and retest. If same issue they'll then put in a low pressure callout.

Said that undersized pipework can sometimes cause a low working pressure at meter.

 

[mfgs]

That is nonsense. Tell him your side is fine and they need to sort out the supply as they aren't given you the required pressure.

 

[ShaunCorbs]

NG said nothing they can do until the pipework to boiler is corrected. Service pipework is 1.25 inch. He put on a new meter and tested but same issue. Gotta do a 28mm run and retest. If same issue they'll then put in a low pressure callout.

Said that undersized pipework can sometimes cause a low working pressure at meter.

one way to solve it wheres meter located?

 

[mfgs]

NG said nothing they can do until the pipework to boiler is corrected. Service pipework is 1.25 inch. He put on a new meter and tested but same issue. Gotta do a 28mm run and retest. If same issue they'll then put in a low pressure callout.

Said that undersized pipework can sometimes cause a low working pressure at meter.

Range rate the boiler down to 30kw and retest with him there, if pressure still low at the meter then pointless re-running the gas as the gas run you described should be ok for 30kw

 

[mfgs]

NG said nothing they can do until the pipework to boiler is corrected. Service pipework is 1.25 inch. He put on a new meter and tested but same issue. Gotta do a 28mm run and retest. If same issue they'll then put in a low pressure callout.

Said that undersized pipework can sometimes cause a low working pressure at meter.

Range rate the boiler down to 30kw and retest with him there, if pressure still low at the meter then pointless re-running the gas as the gas run you described should be ok for 30kw

 

[jaydebruyne]

one way to solve it wheres meter located?

In basement, below the boiler on ground floor

 

[ShaunCorbs]

In basement, below the boiler on ground floor

feck if it was outside / close to a door would open the bloody thing up (dont connect outpipe) if your still getting low op pressure with nothing connected for a second or two problem isnt your side

(which i dont think it is)

 

[Atouchofgas]

Cut in test point under boiler, 2 x gauges if it's 9 at test point and 10 at meter your pipes fine.
Have they done a mains upgrade and shoved plastic up the old service?
Discon flexi at ecv and let it blow maybe water in mains?

 

[jaydebruyne]

That's utter bollox telk them to sort there side out first working pressure of 10mbar and under isn't acceptable and doesn't matter what size output pipe is still be the same

So call them out again??? :/ thing is, he said NG won't put it forward as a low pressure callout if the pipework is undersized. Hate being the new boy sometimes, now I'm gonna loook like a right idiot to my customer 🙁

 

[ShaunCorbs]

Cut in test point under boiler, 2 x gauges if it's 9 at test point and 10 at meter your pipes fine.
Have they done a mains upgrade and shoved plastic up the old service?
Discon flexi at ecv and let it blow maybe water in mains?

10mbar meter
8 mbar boiler

so not a million miles out

 

[ShaunCorbs]

So call them out again??? :/ thing is, he said NG won't put it forward as a low pressure callout if the pipework is undersized. Hate being the new boy sometimes, now I'm gonna loook like a right idiot to my customer 🙁

give me tonight have a mate who works for national grid, will see what he says

 

[jaydebruyne]

give me tonight have a mate who works for national grid, will see what he says

Cheers Shaun

 

[mfgs]

You are getting a 2mb drop from meter to gas valve in the boiler? Worcester allow a drop internally so the 2mb is fine

 

[ShaunCorbs]

Cheers Shaun

think its all bull tbh 😀

 

[ShaunCorbs]

Cheers Shaun

think its all bull tbh 😀

 

[newcastle phill]

10mbar meter
8 mbar boiler

so not a million miles out

Sounds about right including gas valve test point press drop but even if pipework was undersized you should still get a working pressure at the meter within spec regardless Jay.
How are you measuring pressure - digital or manometer. Water guage or single sided. If single sided you have got right fluid in. I know you had an issue the other week with a vaillant.

 

[wattsie1987]

Undersized internal pipework was NCS providing safe working of all appliances can be achieved. Now is just a recommendation. And how can you test the internal pipework with an AR meter installation? Tell them you've done your calcs and the internal run is satisfactory. At the end of the day the customer is paying for a service they are not providing them with ie 6m3 at 21 +/- 2.