purge calculations example?

[sterry_12]

hi lads i've just left the mob and im doing acs gas. starting to build my portfolio up by doing unpaid work. been writing last job up all weekend, installing new boiler, jus struggling with the purging calculations. i have the Niceic on site guide and it doesn't show any workings out. its just got U6 meter under 28mm 0.01m3. has anyone got an example of the calculations i need to put into the portfolio?

 

[psk]

if your MV+PV+FV=less than 0.02m3 then your purge volume is 0.01m3, if over 0.02m3 than you have to light the gas at the farthest point in the installation or purge in stages making sure the area in wellventilated.

 

[kirkgas]

if your MV+PV+FV=less than 0.02m3 then your purge volume is 0.01m3, if over 0.02m3 than you have to light the gas at the farthest point in the installation or purge in stages making sure the area in wellventilated.

the figure of 0.02m3 is the break point where the purge procedure changes from purge to vented room with no ignition for under 0.02m3 and constantly light the gas mixture for over 0.02m3, an E6 or U6 with pipes up to 28mm is a straight purge of 0.01m3, but constanly changes if any pipework is over 28mm and it needs to be worked out by length and diameter, with a 10% addition for fittings
the calculation is meter purge volume + (pipe volumes plus 10%, then multiply by 1.5)

 

[SafeGasInstall]

kirk how do you know all this staff ......when last did you do it ???

well done again kirk

 

[tamz]

Probaly last did it on Friday

 

[psk]

kirk, do you have assessments every week?
i like your way of explanation, i just typed through thx

 

[kirkgas]

kirk how do you know all this staff ......when last did you do it ???

well done again kirk

when did i last do it? years ago
when did i last talk about it? every other week

 

[kirkgas]

kirk, do you have assessments every week?
i like your way of explanation, i just typed through thx

we do assessments evry 4 weeks or so, plus private guys so this kinda thing is getting discussed most weeks

 

[SafeGasInstall]

really i though you discussed underfloor heating systems and lately the Dihydrogen Monoxide

 

[plumbdoctor]

kirk is correct came up in my acs re-assessment few weeks back

 

[sterry_12]

great stuff kirk thanks, better explained than the text book!

 

[gaspastemania]

Gotta take your hat off to that explanation .