Gas pipe size

[Jaybrian]

I have a 22mm gas pipe going from my meter in the garage to my boiler in the kitchen. It has a 15mm t off the 22mm for a gas cooker. There is 8.5m of 22mm plus 6 90 degree bends, easily accessible in the garage, and 5m in the kitchen that will be difficult to access. If i change the 22mm in the garage to 28mm, and join this to the 22mm as it enters the kitchen, will this improve the capability of the gas service. I realise that a calculation is necessary, but will what i am suggesting actually work.

 

[Timmy D]

We can’t say if what you’re proposing will/won’t work. It needs an on-site calculation by a registered gas engineer who burdens the responsibility.

And I’m gonna sound like a **** but if one of us gave you our thoughts/an answer, it could be right but in the worse case scenario, it could be fatally wrong.
If you’re not a register gas engineer, how would you know?
We as competent engineers have a duty to protect life, so can’t enable unproven non professionals.
If you are a RGE, we’ve got a private forum you can gain access to, for further advice.

Sorry I couldn’t have been more help.

 

[Jaybrian]

We can’t say if what you’re proposing will/won’t work. It needs an on-site calculation by a registered gas engineer who burdens the responsibility.

And I’m gonna sound like a **** but if one of us gave you our thoughts/an answer, it could be right but in the worse case scenario, it could be fatally wrong.
If you’re not a register gas engineer, how would you know?
We as competent engineers have a duty to protect life, so can’t enable unproven non professionals.
If you are a RGE, we’ve got a private forum you can gain access to, for further advice.

Sorry I couldn’t have been more help.

 

[Jaybrian]

It was just the principle of increasing pipe diameter only partially along the run. I don't want specifics, but just to know if this in theory will make a difference to the final pressure drop. Forget about any distances i have given.

 

[ShaunCorbs]

Can we ask why do you need to know planning a new boiler ?

 

[Jaybrian]

Can we ask why do you need to know planning a new boiler ?

A new boiler has already been fitted with a t off for a cooker. I think 22mm is under sized for 2 appliances given the distance from the meter. The 22mm runs inside my garage, then through into a single storey flat roof kitchen. About 2/3 of the 22mm is accessible in the garage, the rest is in the ceiling of the single storey. Obviously it would be preferable if just the exposed 22mm in the garage could be replaced in order to upgrade the pipe line. I hope this is clear.

 

[ShaunCorbs]

What size of boiler has been installed?

 

[Jaybrian]

What size of boiler has been installed?

Greenstar 30i

 

[ShaunCorbs]

It’s just on the limit of being fine note you can’t do the work yourself if you decide to

 

[Jaybrian]

It’s just on the limit of being fine note you can’t do the work yourself if you decide to

No i wasn't intending to. It's just about my options. If i did want to install a gas cooker, in principle, could i upgrade the gas pipe by changing the 22mm to 28mm in the garage, but leave the 22mm as it is in the kitchen. Obviously if this was possible, it is something that i could get done. Thanks for the help.

 

[ShaunCorbs]

Yes that’s fine straight from the meter

 

[Jaybrian]

Yes that’s fine straight from the meter

Thanks for your time. Just to confirm, if the pipe from the meter to the point where it goes through the wall into the kitchen is replaced with 28mm pipe, and then reduced to 22mm at the wall between the garage and kitchen, this "could" upgrade the pipeline to enable the supply to feed more than one appliance. It's all about options as i may well not bother with a gas cooker. Again, thanks for your time.

 

[Jaybrian]

We can’t say if what you’re proposing will/won’t work. It needs an on-site calculation by a registered gas engineer who burdens the responsibility.

And I’m gonna sound like a **** but if one of us gave you our thoughts/an answer, it could be right but in the worse case scenario, it could be fatally wrong.
If you’re not a register gas engineer, how would you know?
We as competent engineers have a duty to protect life, so can’t enable unproven non professionals.
If you are a RGE, we’ve got a private forum you can gain access to, for further advice.

Sorry I couldn’t have been more help.

All i wanted to know was does increasing the pipe size over part of the run increase the capability of the pipe line as a whole. No specifics. A gas engineer would have to do the calculations, and then the work, not me.

 

[Timmy D]

All i wanted to know was does increasing the pipe size over part of the run increase the capability of the pipe line as a whole. No specifics. A gas engineer would have to do the calculations, and then the work, not me.

I’ve seen your other posts.

Yes, increasing the size, reduces frictional losses, thus the capacity increases.

The increase can be at any point along the run, although typically at the beginning.

 

[Jaybrian]

I’ve seen your other posts.

Yes, increasing the size, reduces frictional losses, thus the capacity increases.

The increase can be at any point along the run, although typically at the beginning.

Thanks for the reply. I am going to get a calculation done by a gas engineer to see what my options are.