National Grid

[jaydebruyne]

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.

I use a regin premiere gauge with the regin fluid. I double checked my gauge on my meter at home and it's working fine.

Thing is, at gas college, teacher said if all appliances are on and pipework is undersized the working pressure can drop below the nominal. Is this not true then?

 

[jaydebruyne]

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.

Very true. Why would NG say that they won't do anything until the pipe run is upped to 28mm?

 

[wattsie1987]

I use a regin premiere gauge with the regin fluid. I double checked my gauge on my meter at home and it's working fine.

Thing is, at gas college, teacher said if all appliances are on and pipework is undersized the working pressure can drop below the nominal. Is this not true then?

Never heard that before, can't see how it would either the other way round maybe if less than 19 at meter a larger drop across installation would be negligible tho I think.

 

[newcastle phill]

There is one stupid exception. Im sure youve heard the "peak time" caveat.

Otherwise if overall demand is upto 6m3 on a typical domestic meter then it should pretty much be in the ballpark at the meter.

 

[Last Plumber]

Your problem is either a blockage in main or undersized main.
The Nat Grid would have turned that off if they had seen it so low and investigated it.
They won't go around messing with appliances to set them on full rate. If you have an issue like that, you'd be best to arrange to meet on site and you ensure that you set the appliances running on high rate.

The internal pipe work is nothing to do with it by the sounds of it.

The only way that internals could effect the service is if you're pulling too much gas through it for it's size.

 

[jaydebruyne]

Your problem is either a blockage in main or undersized main.
The Nat Grid would have turned that off if they had seen it so low and investigated it.
They won't go around messing with appliances to set them on full rate. If you have an issue like that, you'd be best to arrange to meet on site and you ensure that you set the appliances running on high rate.

The internal pipe work is nothing to do with it by the sounds of it.

The only way that internals could effect the service is if you're pulling too much gas through it for it's size.

I was there with them in the 2nd visit and ran it at max rate. So he witnessed it at 12mbar. He still said up the internal pipework before we can call it in as low pressure service side. He also stated the next door had no issues and that's as far as he investigated as he had no ecv test points. He also said the boiler could be pulling too much gas through the pipework.

Can you buy ecv test points in the web? Might just test it myself for a definitive answer

 

[wattsie1987]

Not sure try bes

 

[jaydebruyne]

There is one stupid exception. Im sure youve heard the "peak time" caveat.

Otherwise if overall demand is upto 6m3 on a typical domestic meter then it should pretty much be in the ballpark at the meter.

I have. But this was at about 11:30am and then again at 3pm and last time at about 7pm which was the only peak time test.

 

[newcastle phill]

Yeh there is no definition of a peak time - thats whats stupid about it.

 

[jaydebruyne]

Yeh there is no definition of a peak time - thats whats stupid about it.

Lol furry muff!!

 

[jaydebruyne]

Not sure try bes

It's and inch connector isn't it?

 

[jaydebruyne]

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

Did you manage to speak to your mate Shaun?

 

[ShaunCorbs]

Did you manage to speak to your mate Shaun?

yes he said its strange and not uncommon for that excuse

 

[newcastle phill]

Speaking of strange - netflix - stranger things....mint

 

[Ric2013]

He also said the boiler could be pulling too much gas through the pipework.

Did he explain HOW the boiler can possibly be pulling too much gas through if the run from the meter to the boiler is undersized? Surely the boiler would be UNABLE to pull through too much gas as it has a restriction and so the pressure at the _meter_ test point would be quite normal, and only the _boiler_ end of the restrictive run would have a low pressure?

Not being a gas installer myself, I'm assuming gas behaves much like air, or indeed any other fluid, and doesn't have mystical properties.

 

[joni os]

Venturi effect at test point.

 

[jaydebruyne]

yes he said its strange and not uncommon for that excuse

So call them back out? Either way I have to upgrade the pipework so may just wait until that part is done then they have no excuse

 

[ShaunCorbs]

So call them back out? Either way I have to upgrade the pipework so may just wait until that part is done then they have no excuse

problem is that wont fix it, best have a word with your cus as there paying your bill

from the meter how much exposed pipework can you get at?

 

[jaydebruyne]

problem is that wont fix it, best have a word with your cus as there paying your bill

from the meter how much exposed pipework can you get at?

About 4m in the basement from meter then disappears under flooring

 

[ShaunCorbs]

About 4m in the basement from meter then disappears under flooring

up that first as the rest aprox 6 m with 2-4 elbows should be fine