Installation of Gas fired boiler and Gas cooker

[listedbuildingonabudget]

We are planning installation of a gas fired combi boiler for a 3 bed, 3 floor, house, and a gas (dual fuel to be precise) range cooker.

I will be using a professional tradesman to do the job in due course and they will of course advise on the route. However some tradesmen have come before and offered such different opinions that I would like some information in advance to help me to more firmly specify the gas route for the job tender, and make structural preparations for the laying of the gas route.

I have a route in mind for the pipe run to the boiler and cooker (naturally I am open to suggestions from a professional or person more experienced than I).

The proposed gas route goes from the supply box about 12 metres horizontally and with 3 turns to a T piece. From the T piece it goes a further 1 metre and 1 turn to the cooker. Also from the T piece the pipe goes a further 10 metres, including up a floor, and a further 4 turns, to the boiler.

I had in mind permanent welded copper piping because I (maybe wrongly) think that it being more permanent it is more safe. Plastic is cheaper. Is the consensus in the trade that copper is necessary?

Should I go for 25mm or 28 mm pipe?

Does anyone see any concerns with the number of turns in the pipework?, particularly before the combi?

Is it worthwhile using "long turn" turns instead of sharp turns?

Many thanks for your thoughts in advance.

 

[newbuildinstaller]

leave it to your professional. He will/should size and run the pipe correctly this isnt your concern.

1- Plastic for gas is a no
2- Copper is soldered not welded
3- 25mm isnt a size for domestic pipework

lots of calculations that you dont know and us gas people cant tell you will come into play regarding pipe sizing due to pressure losses through friction. The size of your boiler and cooker must also be known

 

[Biggles..]

25mm is a domestic size if referring to PE as the op was, personally I like yellow hose pipe.

 

[newbuildinstaller]

25mm is a domestic size if referring to PE as the op was, personally I like yellow hose pipe.

was assuming he wasnt going to be running yellow PE round his listed building

 

[Homesafe]

The length and combined appliances gas rate ( how much gas is required by all appliances)inc. any possible future appliances will/should be taken into consideration and will determine what size is adeqate by the gas engineer.
As an exampleI have similar length in my house with a hob and a 28kw combi , and I have got a 9meters @28mm pipe and the rest in 22mm upto the combi with a 15mm taken off for the hob @1/2 meter.
All in copper ofcourse .

 

[FiremanT]

25mm is a domestic size if referring to PE as the op was, personally I like yellow hose pipe.

was assuming he wasnt going to be running yellow PE round his listed building

Blue would look better

 

[doitall]

25mm is a domestic size if referring to PE as the op was, personally I like yellow hose pipe.

was assuming he wasnt going to be running yellow PE round his listed building

Depends how listed it is, the OP may not be using hot works.

 

[newbuildinstaller]

25mm is a domestic size if referring to PE as the op was, personally I like yellow hose pipe.

was assuming he wasnt going to be running yellow PE round his listed building

Depends how listed it is, the OP may not be using hot works.

He mentioned he may be welding pipes so hot works seems allowed

 

[listedbuildingonabudget]

I didnt remember the exact pipe sizes but I was trying to determine if the 12mm copper pipe we have now (from an old pipe network to gas radiant heaters and standard size cooker..there is no gas boiler at moment) will be sufficient. Comments seem to indicate I will need new pipe.

Any answers to these questions, so I can have an idea if chosen route is a goer?

Does anyone see any concerns with the number of turns in the pipework?, particularly before the combi?

Is it worthwhile using "long turn" turns instead of sharp turns?

thanks

 

[newbuildinstaller]

I didnt remember the exact pipe sizes but I was trying to determine if the 12mm copper pipe we have now (from an old pipe network to gas radiant heaters and standard size cooker..there is no gas boiler at moment) will be sufficient. Comments seem to indicate I will need new pipe.

Any answers to these questions, so I can have an idea if chosen route is a goer?

Does anyone see any concerns with the number of turns in the pipework?, particularly before the combi?

Is it worthwhile using "long turn" turns instead of sharp turns?

thanks

the more elbows (fittings) you use will increase the resistance in the gas run therefore possibly forcing you to use a bigger size pipe. The same goes to formed bends (using a bending machine) but to a slightly lesser extent. There are exact figures for the pressure loss for bends and fittings but your installer wll know these

 

[newbuildinstaller]

as said your pipe size will be determined by how many cubic meters of gas you require for your appliances

 

[Dan Robinson]

One has to ask one's self why you are so concerned with the minutia of the project that the engineer will be doing?

Let the installer worry about it.

 

[Homesafe]

One has to ask one's self why you are so concerned with the minutia of the project that the engineer will be doing?

Let the installer worry about it.

Yes but if he wants bends its his choice to make,,then thats upto him , shirley!
In that case,, would'nt he need the services of a bender instead?

Heard theres quite a few gud'uns daan saaf

 

[listedbuildingonabudget]

dan i want to know the route so i can do the prep work like lifting floor boards, drilling walls, do my own costings, etc, to bring the project costs down, simple really.
i prefer tradesman that welcome someone on a budget doing what they can in terms of prep.

 

[newbuildinstaller]

dan i want to know the route so i can do the prep work like lifting floor boards, drilling walls, do my own costings, etc, to bring the project costs down, simple really.
i prefer tradesman that welcome someone on a budget doing what they can in terms of prep.

Then...
A- find your tradesman who will work that way (many wont)
B- Get him to size and map your gas route
C- Say thankyou I will prepare everything for you coming on X day
D- Enjoy your correctly sized legal gas pipe

There are other things than pipe sizes bends etc,
1-What the pipe will pass through (walls, cavities etc)
2-What the pipe will need protecting from (corrosion, electrics min distances etc)
3-Pipe supporting distances
4-Notching standards (max depth and positions)

I personally would give you a quote of say £XXX pounds to run the gas for you with me doing all the work or £XXX - £10 for you to do the work.

What happens if he turns upto fit the pipe and you have missed something or the route is not going to be ok because of something that was hidden on the first inspection? Tell him to come back later (paying a call out charge?)

I dont think it will save you much in the long run so let the gas man do his job and earn his money