Low gas pressure

[Riley]

22 more than good enough pressure drop of 0.73 aprox

At 32kw 8m 12 elbows

View attachment 28761

Exactly what I used

 

[ShaunCorbs]

Up the pipe work jay easily accessible part

Would of thought it would be fine but if manufacturer said needs bigger up it

 

[Riley]

Seems silly though when the simple calculation tells you that the 22 should be fine

 

[jaydebruyne]

Up the pipe work jay easily accessible part

Would of thought it would be fine but if manufacturer said needs bigger up it

Yeah, I'll do 28mm outside and see if that helps. Cheers Shaun! Cheers Riley 😉

 

[ShaunCorbs]

Seems silly though when the simple calculation tells you that the 22 should be fine

Yep but are they going to refuse warrenty if somthing wrong later down the line. Saying aload of bumf about Pipework

 

[Riley]

It should sort it but I'm still not entirely convinced that it should be required

 

[Riley]

Totally agree Shaun it just seems daft when we are all using one type of calculation and then the manufacturer tells you you need to up size it. If there is a factor to take into account with their product then they should make you aware of this otherwise quite legitimately you are going to do your pipe sizing calculation and only find out when the thing is connected that it doesn't work. It hardly seems fair for them to refuse the warranty when you have actually done the due diligence of calculating the pipe sizes

 

[ShaunCorbs]

Any update jay ?

 

[jaydebruyne]

Actually, as per the Viper book, I calculated the pipe size required to carry 3.75m3/h and its 28mm :/ it's because the pipework from the meter doesn't branch until it hits the boiler when it tees to the hob. I just hope that the section I up to 28mm is enough.

 

[jaydebruyne]

Any update jay ?

Going to do the job Sunday Shaun, will let you know as soon as I'm done.. fingers crossed. I'm not 100% convinced it's going to work as only upping half the run but we'll see!

 

[Last Plumber]

Good luck

 

[jaydebruyne]

Didn't work! Got another 0.15 m3/h - now have to take up the floor to replace the rest of the run as the guy don't want it run externally..

 

[Scott_D]

have you cut a test point under the boiler?

 

[newcastle phill]

With the boiler on minimum rate does it still affect the hob ???.

 

[jaydebruyne]

have you cut a test point under the boiler?

No, plumbcenter didn't have any and I didn't have time to go elsewhere :/

 

[Simon F]

Pipework from meter is 22mm, goes in house and under floor in 22mm approx 3-3.5m. Comes out of floor where boiler is in 15mm.

no one else seems to be asking this so.
does the size change from 22 to 15 at some point under the floor?
how much 15mm pipe is there?
that will starve the flow dramatically!

 

[jaydebruyne]

no one else seems to be asking this so.
does the size change from 22 to 15 at some point under the floor?
how much 15mm pipe is there?
that will starve the flow dramatically!

It changes under the floor and no idea where.. so going to replace the rest of the run with 28 until it hits underneath the boiler which it'll then be 15 for about 500mm and tee off in 15 for the hob for about 1.5m

 

[Simon F]

sounds like that's the problem then,
run the 28 as far as practical then 22 straight to the boiler

 

[jaydebruyne]

sounds like that's the problem then,
run the 28 as far as practical then 22 straight to the boiler

Will be doing it Saturday. Cheers Simon

 

[Last Plumber]

no one else seems to be asking this so.
does the size change from 22 to 15 at some point under the floor?
how much 15mm pipe is there?
that will starve the flow dramatically!

I've asked about the 15mm!

I also asked about the hob and its burner setting!

I'd look at that before running 28mm