gas pipe sizing

[Inverness]

is the layout letters correct for the a-b and so on? and the size of pipe that is required for the amount of gas provide for each appliance. if its wrong I'm never going to get it.

 

[ShaunCorbs]

at a rough look your off how many elbows for the sections of pipe?

esp for a load of about 56kw

 

[Inverness]

I've included my bends and tees in the my overall pipe length.

 

[ShaunCorbs]

I've included my bends and tees in the my overall pipe length.

no so i can work it out 🙂 unless your drawing is right?

 

[Inverness]

Instead of writing how length of pipe answer then equivalent length i just added my answer total.

 

[Inverness]

my drawing is exactly for what you see for the amount of bends and tees.

 

[ShaunCorbs]

my drawing is exactly for what you see for the amount of bends and tees.

ok also D-E 8.7 m3 of gas???????

 

[Inverness]

a-b, 2m length pipe, tee 0.5, overall pipe size 2.5m

 

[ShaunCorbs]

think this will help you more bud

[DLMURL]http://copperplumbing.org.uk/sites/default/files/content_attachments/domestic-gas-planning-and-sizing_0.pdf[/DLMURL]

and give us 10 will work it out

 

[Inverness]

i assumed from d-e 8.7 m3 of gas required to feed appliance f, appliance h and appliance j. all added to 4.7m3 of gas.

 

[Inverness]

ok thanks. ill haver a read of this and once i think I've got it ill ask you guys>

 

[ShaunCorbs]

i assumed from d-e 8.7 m3 of gas required to feed appliance f, appliance h and appliance j. all added to 4.7m3 of gas.

you put 8.7 and not 4.7???????

 

[Inverness]

yes thats what i mean.

 

[Dotty]

Don't fret too much Invy, everyone struggles with this at first but once you've got it it's a doddle.

 

[Inverness]

thanks that means a lot. I've been trying to do this allay but still don't get it.

 

[Dotty]

I've also merged both your threads to avoid confusion.

 

[Inverness]

thank you. shaun has put me into the right direction so hopefully reading this is the proper way of understanding it.
when you do gas pipe sizing does everyone do this table to work out the size of pipe?

 

[ShaunCorbs]

thank you. shaun has put me into the right direction so hopefully reading this is the proper way of understanding it.
when you do gas pipe sizing does everyone do this table to work out the size of pipe?

ive got a mears calcs but if i have to back to the books

 

[ShaunCorbs]

A - B 5.7m3 2m : 2m , 1.5m = 3.5m, 35mm

B - C 1.0m3 1m : 1m , 0.0m = 1.0m, 15mm

B - D 4.7m3 4m : 4m , 0.5m = 4.5m, 35mm

D - E 4.7m3 2m : 2m , 0.5m = 2.5m, 35mm (will be ok in 28mm)

E - F 1.0m3 1m : 1m , 0.0m = 1.0m, 15mm

E - G 3.7m3 2m : 2m , 0.5m = 2.5m, 28mm

G - H 1.0m3 2m : 2m , 0.0m = 2.0m, 15mm

G - J 3.2m3 5m : 5m , 0.0m = 5.0m, 28mm

not 1000% as all ive got at home is a ft3h mears calc 😀

 

[Inverness]

 

[ShaunCorbs]

looks fine mate starting to get the hang of it ?

 

[Inverness]

its down too you mate.ill do more and let you see.

would it be good practice to have the actual pressure loss at 0.5 instead of being close at 1.0.?

 

[ShaunCorbs]

its down too you mate.ill do more and let you see.

would it be good practice to have the actual pressure loss at 0.5 instead of being close at 1.0.?

in theory yes but then you start going big for example 22mm for a gas fire (7kw) etc

but depending on site conditions running 28mm to as close as you could to the boiler wouldn't hurt

most manufacturers allow 1.5mb at the gas valve test point anyway, and you will find you will have a little wiggle room as the figures arnt that accurate etc (people state different for pressure loss on elbows etc) and im sure you could get it lower by doing some formed bends

 

[Inverness]

Hi Shaun how do you get the progressive drop on the last appliance?

 

[ShaunCorbs]

Hi Shaun how do you get the progressive drop on the last appliance?

add (col 9)

1-2, 2-4 and 4-6 if you mean cooker

1-2 and 2-3 if you mean gas fire

1-2, 2-4 and 4-5 if you mean boiler