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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Gas pipe run
Is a 25' run of 15mm supply pipe acceptable for a new boiler? Thats gas
supply, not electric I need to know fairly quickly this time. Boiler power 30-40 whatnots thank you, NT |
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No
It would not be acceptable for an older boiler wrote in message oups.com... Is a 25' run of 15mm supply pipe acceptable for a new boiler? Thats gas supply, not electric I need to know fairly quickly this time. Boiler power 30-40 whatnots thank you, NT |
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Is a 25' run of 15mm supply pipe acceptable for a new boiler? Thats gas
supply, not electric I need to know fairly quickly this time. Boiler power 30-40 whatnots No, if you mean kW. It might be OK for kBTus (an ancient unit), but calculations might be in order even then. Christian. |
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wrote in message
oups.com... Is a 25' run of 15mm supply pipe acceptable for a new boiler? Thats gas supply, not electric I need to know fairly quickly this time. Boiler power 30-40 whatnots thank you, NT If you have a look here http://www.cda.org.uk/megab2/build/pub124/sec3.htm you should be able to work out just what size you'll need (note the additions for 90 degree elbows etc.) and also how much extra capacity the pipe will have, should you wish to add any extra appliances at a later date. Alex |
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Christian McArdle wrote:
Is a 25' run of 15mm supply pipe acceptable for a new boiler? Thats gas supply, not electric I need to know fairly quickly this time. Boiler power 30-40 whatnots No, if you mean kW. It might be OK for kBTus (an ancient unit), but calculations might be in order even then. Christian. Thanks to everyone I am pretty ignorant on this, but assumed its kbtus. Its probably 30 odd years old. The 15mm supply has never been a problem in any way, but thats bureaucracy for you. So I guess I'll have to run a 2nd pipe in parallel to lower the resistance. I've got an old hose reel somewhere... NT |
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Thanks to everyone I am pretty ignorant on this, but assumed its
kbtus. Its probably 30 odd years old. The 15mm supply has never been a problem in any way, but thats bureaucracy for you. If it has worked perfectly for 30 years, then leave it, unless it has failed an inspection. Without doing the calcs, and assuming few elbows, the run is probably just below spec. Perhaps someone will be kind enough to do the calcs for you! Christian. |
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Christian McArdle wrote:
Thanks to everyone I am pretty ignorant on this, but assumed its kbtus. Its probably 30 odd years old. The 15mm supply has never been a problem in any way, but thats bureaucracy for you. If it has worked perfectly for 30 years, then leave it, unless it has failed an inspection. Without doing the calcs, and assuming few elbows, the run is probably just below spec. Perhaps someone will be kind enough to do the calcs for you! Christian. Yep, its failed. A new run it is - wont be hard to do. Its the new boiler I'm unhappy about. Oh, yes there was another appliance run off that section of pipe too. I guess I had modulation and didnt know it cheers, NT |
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Yep, its failed. A new run it is - wont be hard to do. Its the new
boiler I'm unhappy about. Oh, yes there was another appliance run off that section of pipe too. I guess I had modulation and didnt know it Ah. Another appliance will drop it much lower! If the other appliance is greedy, you might even need 28mm to the split and 22mm after. There's no point in underspeccing the new run. Your next boiler might be a 40kW monster. Christian. |
#12
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Christian McArdle wrote:
If it has worked perfectly for 30 years, then leave it, unless it has failed an inspection. Without doing the calcs, and assuming few elbows, the run is probably just below spec. Perhaps someone will be kind enough to do the calcs for you! Well if you take a m^3 of gas as 37MJ, assume the boiler is 40k BTU (11kW ish) that gives you 11000*3600 J / hour, or about 40MJ. So that is a gas rate of approx 1.1 m^3 / hour. Lets call the pipe run 9m to allow for some bends etc. According to: http://www.cda.org.uk/megab2/build/p...0Tube%20Sizing 9m of 15mm will be good for a gas rate of up to 1.5 m^3 / hour So you look ok right up until the bit where you mention there is another appliance on the pipe! ;-) -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
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