gas pipe volume

[leakylea]

42.,.

I came across a large private house with two Worcester 28rsf boilers one 30 kw ideal mexico a large gas AGA along with two cookers a hob and two gas fires. These were fed by a g10 meter. As we all know there is a limit to the total volume of a system for a domestic gassafe engineer and a g10 takes up quite a good proportion of your volume allowance I had measured all the pipework mainly 28 and 22mm and simply wanted a quick trick for volume calcs. its nearly that time for my ACS updates, in the five years since my last ACS I have volume calc once before, although with the rise in boiler outputs and the amount of 28mm required after pipe sizing it may well be a more regular calculation. after 19 replies still not clear what the private room is. I am a guy trying to do the correct job in a professional way some of the replies let the site down or yourselves I am not sure. If my requirements were not clear just ask for clarity. people suggesting they new or thought what I might of meant or that I am a DIYer simply waste energy and are the reason I rarely use the site the job by the way was completed correctly thanks girls

 

[Atouchofgas]

http://www.ukplumbersforums.co.uk/g...ncement-how-gain-access-private-gas-safe.html
This is how we can answer this question

 

[Dotty]

Thread moved.

NOW you can answer him!

 

[kirkgas]

To calculate the IV of an installation it's not so much the formula you need but the tables containing the IV of each pipe size/material and the meters, of course you still need the formula but it's easy:
Split the installation into pipe lengths for each diameter then multiply the running length by the volume per metre from the table eg (all volumes are per linear m for copper)
15mm is 0.00014
22mm is 0.00032
28mm is 0.00054
35mm is 0.00084
Once you have added all the pipe lengths up you then multiply the total by 1.1 (to add 10% which is an allowance for fittings! it's the same allowance for every install)
You then add the IV of the specific meter (info taken from another table)
Eg U16 is 0.025
The total is the IV of the installation and needs to be under 0.035m3 to be worked on by a domestic engineer
The next step would be to calculate the PV (purge volume) this is simply done by calculating the IV as above then multiplying the answer by 1.5

 

[AlexGas]

To calculate the IV of an installation it's not so much the formula you need but the tables containing the IV of each pipe size/material and the meters, of course you still need the formula but it's easy:
Split the installation into pipe lengths for each diameter then multiply the running length by the volume per metre from the table eg (all volumes are per linear m for copper)
15mm is 0.00014
22mm is 0.00032
28mm is 0.00054
35mm is 0.00084
Once you have added all the pipe lengths up you then multiply the total by 1.1 (to add 10% which is an allowance for fittings! it's the same allowance for every install)
You then add the IV of the specific meter (info taken from another table)
Eg U16 is 0.025
The total is the IV of the installation and needs to be under 0.035m3 to be worked on by a domestic engineer
The next step would be to calculate the PV (purge volume) this is simply done by calculating the IV as above then multiplying the answer by 1.5

Spot on!

And the total PV (PV[SUB]t[/SUB])
PV[SUB]t [/SUB]= PV[SUB]m [/SUB]+ 1.5 (IV[SUB]p [/SUB]+ IV[SUB]f[/SUB])
PV of U16 is 0.03 m[SUP]3[/SUP]

 

[AlexGas]

If IV exceeds 0.02 m3,the purged mixture shall be ignited as soon as possible at an open burner or at a temporarily-installed burner.

If IV does not exceed 0.02 m3, the purging procedures may be applied without attempting to light the purged mixture at any stage, provided the area into which the gas is being purged is well ventilated, for example with windows and doors.

IGE/UP/1B Edition 2.

 

[leakylea]

thankyou thankyou thank you !