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- Thread starter armyash
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- gas engineer meter pipe
N
newcastle phill
Well you've got 2 sections there by the sounds of it so will be calc'ed on 0.5mb drop per section.
Calculate the gas rate per appliance. Size the pipe accordingly from viper tables.
Note viper tables relate to 1mb drop per length.
So would need multiplying up accordingly for more sections.
Its very important ash to get this bit right.
>>>>>>My advice is rough based on your outline.
Adding a diagram wit elbows and tees and distances would allow help you more.<<<<<<
An elbow and tee add 0.5m each. Swept bend 0.3m each to total length
N
newcastle phill
I will have to come back with that info.
This is where my lack of experience shows, will need to get my head in back in the books.
D
Dotty
Phil's right, instead of throwing pipe sizes at Ash it'd be more beneficial to him to help him with the working out for future jobs. I know most of you can get it right by rule of thumb and experience but our boy's not quite there yet.
Let's make a good engineer into an excellent one.
I’ve done all of the math just now on paper. There are could be more bends and elbows though.
Ok so lets say for arguments sake it does definitely need 28mm.
That would be 28mm from the meter and only reduce it at the points it branches off for each appliance?
I'd say 99% of houses I go to it's 22mm off the meter all the way to the boiler and 15mm for cooker/hob. I rarely see 28mm from the meter!. I should get back to this property tomorrow and will check the appliances. As it's all in 22mm now does that mean it's all been incorrectly sized up to now or does moving the meter 4 meters away and adding in a few 90's make that much more difference?
I'm happy to do it the correct way but it's frustrating thinking how little I see 28mm on peoples houses if this is the case. Thanks for all the replies.
That would be 28mm from the meter and only reduce it at the points it branches off for each appliance?
I'd say 99% of houses I go to it's 22mm off the meter all the way to the boiler and 15mm for cooker/hob. I rarely see 28mm from the meter!. I should get back to this property tomorrow and will check the appliances. As it's all in 22mm now does that mean it's all been incorrectly sized up to now or does moving the meter 4 meters away and adding in a few 90's make that much more difference?
I'm happy to do it the correct way but it's frustrating thinking how little I see 28mm on peoples houses if this is the case. Thanks for all the replies.
Last edited:
N
newcastle phill
Ash. If its 4m longer and you have 2 branches/legs.
That 4m can then effectively becomes at least 8m or with an elbow etc more...
It Can make all the difference...
...especially when its being audited by gas safe.
I cant see diagram as on tapatalk and its not showing
That 4m can then effectively becomes at least 8m or with an elbow etc more...
It Can make all the difference...
...especially when its being audited by gas safe.
I cant see diagram as on tapatalk and its not showing
Ok ill check KW of the appliances when i next go back. If 28mm is required that's what i will advise. I know the customer is not going to want me to upgrade the whole lot to 28mm but if that does turn out to be the case he will have to go elsewhere. I might be lacking experience but that's why i come on here and ask questions. I know some guys who would have just extended the 22mm no questions asked.
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