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Discuss Reverse pipe-sizing in the Gas Engineers Forum area at PlumbersForums.net

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Hi I'm doing a quote for a customer who currently has a 38kw regular boiler. The size of the house/rads etc. suggests a 24kw or 27kw boiler would be fine. I have done a working pressure test and currently they have a 4.5mb drop over the gas run. I can't see the gas pipe as it runs under the floor, but I see 28mm leaving the meter and 22mm coming up to the boiler. I wanted to know if there was an equation that would allow me to work out the pressure drop of the 24kw & 27kw boilers, going by the 4.5mb drop on a 38kw boiler? Any help is much appreciated. Regards
 
Nope sorry you need to know the approximate run
 

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