Low gas pressure

[jaydebruyne]

found this mate and thought of you

https://twitter.com/irbheating/status/834063695613423618

incoming 20 mbar

gas test nipple 15.7 mbar

You, Sir, have MADE MY FRIGGIN DAY!!!!!!!!!!!!!!! 🙂))

 

[jaydebruyne]

found this mate and thought of you

https://twitter.com/irbheating/status/834063695613423618

incoming 20 mbar

gas test nipple 15.7 mbar

Where can I get these compression test points???? I've searched but can't find them

 

[Atouchofgas]

Use one of these
https://www.bes.co.uk/22-mm-x-22-mm-x-1-2in-tee-compression-x-compression-x-bsp-f
With one of these
https://www.bes.co.uk/1-2in-x-1-8in-hexagon-bsp-parallel-reducing-bush
And one of these
https://www.bes.co.uk/test-point-nipple-brass#product-details-tab

 

[ShaunCorbs]

Where can I get these compression test points???? I've searched but can't find them

15mm or 22mm to 1/2 t and then reducing bush from 1/2 to 1/8th

 

[jaydebruyne]

Use one of these
https://www.bes.co.uk/22-mm-x-22-mm-x-1-2in-tee-compression-x-compression-x-bsp-f
With one of these
https://www.bes.co.uk/1-2in-x-1-8in-hexagon-bsp-parallel-reducing-bush
And one of these
https://www.bes.co.uk/test-point-nipple-brass#product-details-tab

Aaah I see!!! Cheers dude

 

[ShaunCorbs]

You, Sir, have MADE MY FRIGGIN DAY!!!!!!!!!!!!!!! 🙂))

bad day?

 

[jaydebruyne]

bad day?

Actually it wasn't too bad lol but this has been bothering my brain!!

 

[jaydebruyne]

So, upped the pipework to 28 in basement, cut in a test point under the boiler and proved pipework was fine at 1mb drop.. still getting 12 working at meter. So I call NG. Guy says, don't run boiler on max rate, just run it normally because we don't test in max rate. Says if he gets good wp at meter at normal rate he's leaving. So I start to call gas safe register. He says run the boiler on max rate. He then finally accepts there's a problem with service pipework and calls it in!!!!!!

He reckons by running a boiler on max rate will generally always get lower than 19 wp at meter. Really? I say. I've never seen this before at the meter when I've done installs. Reckons that's how it is.

Jesus H Christ!!!!

 

[ShaunCorbs]

Good on you jay, stand your ground

Always love a good argument 😀

 

[Last Plumber]

It depends on the size of the service.
good on you though !

 

[Last Plumber]

It depends on the size of the service.
good on you though !

 

[Leo21]

They do that with the huge output domestic boilers the manufacturers are selling now.
40kw combi,s, why?

 

[Last Plumber]

Pulling too much through an undersized pipe

 

[jaydebruyne]

Ok.. so back to the original job on this post..

I fitted a Vaillant 30kW system boiler and upped the pipework in 28mm from meter to boiler as boiler and hob wasn't getting enough gas

I've now added a test point to both boiler and hob. I've also teed the hob off the 28 which I brought further up underneath the boiler..

I added the test point on the 15mm.. so!

Standing @ meter 25mb
WP @ meter both app 21mb
WP @ meter 1 app 21.5mb
WP @ boiler test point 20mb
WP @ hob test point 20mb
WP @ boiler with hob on 19mb
WP @ hob with boiler on 19mb

Have told custard to replace hob as burners went out with just hob on- hob is 30 years old.

I expected to see a working pressure of 20 at both appliances when both on.

Pipework is not undersized.

Why am I only getting 19????

These are my pipe calculations for what's currently there..

 

[ShaunCorbs]

I would be happy with them pressures

 

[jaydebruyne]

I would be happy with them pressures

Really? But surely I shouldn't be getting a 2mb drop across pipework??

 

[Old Account]

Really? But surely I shouldn't be getting a 2mb drop across pipework??

Aren't you allowed to have 4mbar drop on an existing pipework with an u6/g4 Meter over a two minute test Periode ?

 

[jaydebruyne]

Aren't you allowed to have 4mbar drop on an existing pipework with an u6/g4 Meter ?

That's for tightness isn't it?

 

[Old Account]

That's for tightness isn't it?

Yes

 

[jaydebruyne]

Yes

I'm talking about pressure drop from meter to appliance