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I have a job where I need to run 30 metres of 28 mm and 10 metres of 22mm copper tube. Now there is no gas hob in the place so I need to light the gas while purging. What right do you guys make up in this scenario. Cheers
Discuss Purging long gas supply in the Plumbing Jobs | The Job-board area at PlumbersForums.net
are you in scope?
no bends eh?Sure, it is still domestic as it comes in at 0.03255
no bends eh?
no bends eh?
Only 6 fittings on the run
sorry mutt, but i disagree!! probably wrong though!
whats the meter?
g4 i make it 0.04401m3
So to calculate the installation volume it is G4 metre 0.008 + 30 metres 28 mm 0.0162 + 10 metres 22mm 0.0032 + 10 % for fittings is 0.0301?
Have I made a mistake some where
must be!
according to the rays gas app...
30mx28mm + 10mx22mm not adding any fittings its 0.04401m3 or 0.04614m3 with fittings!!
you got a link to rays app?
according to this app on a g4 meter with 35m of 22mm no fittings comes to 0.0305m3Just done it manually and I make it 0.03014m3
with a wooosh!30 x 0.00053 = 0.0162 + 10 x 0.00032 = 0.0194 (IVp) + 10% (IVf) = 0.02134 + 0.008 (IVm) = 0.02934 x 1.5 = 0.04401
If the pipe is feeding a boiler just turn it on. It will purge itself to a source of ignition.
according to this app on a g4 meter with 35m of 22mm no fittings comes to 0.0305m3
30 x 0.00053 = 0.0162 + 10 x 0.00032 = 0.0194 (IVp) + 10% (IVf) = 0.02134 + 0.008 (IVm) = 0.02934 x 1.5 = 0.04401
Just done it manually and I make it 0.03014m3
30 x 0.00054 = 0.0162
10 x 0.00032 = 0.0032
meter = 0.008
total = 0.0274
10% = 0.00274
Total = 0.03014
Don't think I've missed anything?
Every app you use will prob give different answer.
If you want accuracy you need go old school and work out using your fingers and toes with standardised formula.
I got 0.02934 volume for a G4 meter.
Technically if its a g4/U6 and pipework 28mm or under you don't need to bother working out the IV. The PV is 5 x cyclic volume (0.002) = 0.01
You've added 10% to the pipework before adding meter volume, right?
that size is the iv of your result/size over 35m of 22mmWhere are you getting 35m of 22mm? I thought we were looking at 30m x 28mm + 10m of 22mm??
Almost right. :yes:
Went wrong by adding the meter before adding your 10%.
that size is the iv of your result/size over 35m of 22mm
True, as that is minimum purge vol but I want to check whether I was taught wrong about the multiplying by 1.5?
Now that's a funny thing. When I first did ACS, I was taught to do your method. Subsequently I was taught to add meter volume first and then add 10%.
Some acs centres have their heads up their rses.
Gimme a minute and i'll post a pic from UP1B.
looking at same volumeaccording to this app (uk gas app) with a g4 meter with straight run of 35mx22mm pipe with no fittings comes to 0.0305m3 so a 30m run of 28mm and 10m of 22mm with 6 fittings cant equate to the same?
Just checked the Construction Skills textbook. 10% added to pipework and then meter volume added. So yeah, the worksheet the assessment centre gave us was wrong!
Although, I noticed something else in the book - we've all been adding 0.008m3 as meter volume, but that is meter internal volume. Meter purge volume is given as 0.01m3 for U6/G4.
God, I'm sad...
Yip. For standard G4/E6 upto 28mm pipe the standard purge is 0.01.Just checked the Construction Skills textbook. 10% added to pipework and then meter volume added. So yeah, the worksheet the assessment centre gave us was wrong!
Although, I noticed something else in the book - we've all been adding 0.008m3 as meter volume, but that is meter internal volume. Meter purge volume is given as 0.01m3 for U6/G4.
God, I'm sad...
Meter purge volume is given as 0.01m3 for U6/G4.
Yip. For standard G4/E6 upto 28mm pipe the standard purge is 0.01.
Bigger meter and or greater than 28mm pipe then you need to calculate.
Wow.a lot of info in there guys. Thank you. So basically, all I need to do is purge 0.01 and all is well as no 35mm pipe or u16 meter.
So I am within scope.
I know some boilers have a purge setting on them so think I shall do it this way
Thanks for all the help guys. I appreciate it.
no!
the installation volume is>0.035 and by the book..its out of scope!
whether it matters could be debateable but you wouldnt do it near an inspector
perhaps were all on a learning curve here, one for the acs reassesment center when tickets are due.haha
however, based on this there in scope and simular to what tam said, so 'grey area'?
http://shop.igem.org.uk/download/document/Pages from IGE-UP-1B Edition 2.pdf
http://shop.igem.org.uk/download/do...UP-1A Edition 2 (Reprint with amendments).pdf
The volume is 0.2934 so its fine
I should reload again after going to the shop
He's well within scope!
Scope refers to the installation volume, not the purge volume. Installation volume in this case is, as several have worked out, 0.030M3
The purge volume is 0.085m3 which, if you crack a joint under the boiler, will take 180 seconds to purge.
You'll have gas long before that but the 120 will definitely prevent any air pockets being left.
Just wondering how you worked out the purge time. Is there a calculation you do to figure this rather than having to go to the meter to make sure you purge the correct amount?
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