Combi Boiler Gas Supply Requirements

southcoastrgi

cyclonebri1 wrote: »

Sorry Keith not doubting the trade, but if 2 registered installers have opposing view then 1 of them is wrong or being over cautious. I's want to know which.;)

or doesn't know how or can't be bothered to work it out, the same way as thousands of houses are built with 1/2 inch iron pipes for the boiler feed with no thought of future expansion, or copper pipes laid in screed with no protection

cyclonebri1

southcoastrgi wrote: »

or doesn't know how or can't be bothered to work it out, the same way as thousands of houses are built with 1/2 inch iron pipes for the boiler feed with no thought of future expansion, or copper pipes laid in screed with no protection

Hmmm, but there lies a real difference, 1/2" steel pipe is about 3/4" internal bore from memory, haven't seen a table that quotes for runs in 1/2", at least not since I was doing steam work in industry. ;)

Being a total pedant, it checks out at 18.631mm id, but that will vary dependant on which table pipe is in question.

southcoastrgi

cyclonebri1 wrote: »

Hmmm, but there lies a real difference, 1/2" steel pipe is about 3/4" internal bore from memory

Abit early for the old G & T isn't it cy

cyclonebri1

southcoastrgi wrote: »

Abit early for the old G & T isn't it cy

:A:A:A 1/2" standard pipe is over 22mm ext dia. Do we have a misunderstanding/are talking two different standards of measurement????

My 1st house, a 1876 terraced miners cottage was piped in 1/2" pipe
and fed the whole house, no issue.

You've lost me, :beer: not

keystone

cyclonebri1 wrote: »

:A:A:A 1/2" standard pipe is over 22mm ext dia.

Indeed but in the post to which he refers you said the internal diameter was 3/4" not the external. Must admit I thought the same as SouthCoast last night but didn't like to rub it in.

Cheers

cyclonebri1

keystone wrote: »

Indeed but in the post to which he refers you said the internal diameter was 3/4" not the external. Must admit I thought the same as SouthCoast last night but didn't like to rub it in.

Cheers

The internal diameter of standard 1/2" bsp pipe is 3/4" , 18mm+ as I stated.

Come on guys lets get this together, before I crack today's bottle

to clarify, 1/2" pipe is about 23mm O/D and 18mm I/D, please feel free to discuss/argue, :D:D:D:D

Canucklehead

Hi


It sounds wrong, how can a pipe be 1/2" and 3/4" internally, but is correct (you can get all pedantic about millimetres but it is essentially correct)

That's why steel pipe will carry a greater volume of gas that the equivalent size in copper.

GSR.

keystone

Half inch pipe has an id of quite a bit less than 3/4 inch and its not just about mm either. Its confusion measurement to state that half inch pipe has an id of 3/4 inch and thats why I got my sharp little stick out. Anyway I'm enjoying this. Carry on.

Heres a new toy



works just as well with beer!

:beer::beer::beer::beer:

Cheers

cyclonebri1

Ok, so is 1/2" pipe is 18.631mm internal bore or what?

Any apologises accepted grate/gracefully, :D:D:D

18.632mm is actually 47/64ths of an inch bore, not exactly "an id of quite a bit less than 3/4 inch"

A 1 64th of an inch bore in fact

keystone

cyclonebri1 wrote: »

Ok, so is 1/2" pipe is 18.631mm internal bore or what?

Yep but thats 0.7 of an inch which isn't 0.75 but its not about the actual size its saying that ½inch pipe has a 3/4 inch id which it doesn't. Can't we stick on old measurements for imperial discussions. :p:p

Any apologises accepted grate/gracefully, :D:D:D

Grudgingly because this thread could become boreing (yes deliberate). :D

A 1 64th of an inch bore in fact

and now it has. Have a beer. :beer:

Cheers