Purging formula

[pipeline]

evening all ...not sure weather u can answer my question as its a gas related 1,, but ill give it ago.
when figuring out purging volumes how do u caculate it. if the pipes are buired in the ground ?.. thanks

 

[Dotty]

Unless you can actually see the tracks where the pipework is you'll have to take a best guess. It's best to be over than under.

 

[kirkgas]

If you can't confirm the pipe size under ground you assume worst case scenario and use the biggest size you have, ie 28mm drops under floor and appears out the other side 6m away in 22mm you need to calculate at 6m of 28mm as you don't know where it drops down, then calculate from 22mm where it rises out the floor

 

[village idiot]

Is there any particular reason why you need to know the formula? Just curious

 

[kozak1968]

Another grey area in the gas regs.

 

[pipeline]

Is there any particular reason why you need to know the formula? Just curious

just because I thought u needed to know it to become a gas engineer. thanks

 

[AWheating]

purge at the cooker, the volume is about the time it takes to mek me a bacon sanga.

 

[village idiot]

just because I thought u needed to know it to become a gas engineer. thanks

OK. Curiosity satisfied. I thought someone had done an installation and you wanted to confirm if they had done the purging right.
Hope you are having a Merry Xmas. BTW, see you in the Gas forum when your tckt comes through.

 

[Taffman]

If you can't confirm the pipe size under ground you assume worst case scenario and use the biggest size you have, ie 28mm drops under floor and appears out the other side 6m away in 22mm you need to calculate at 6m of 28mm as you don't know where it drops down, then calculate from 22mm where it rises out the floor

i gree with Kirkgas