Discuss Track pipe sizing meter locations in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Matt0167

Gas Engineer
Messages
57
Hi

Has any one got information on track pipe volumes and discharge rates

Currently doing a 3 storey plot of flats with 3 flats per floor , I've been asking from day one on meter locations so we can run gas 1st fix to meter box , no M&E drawings .

Meters was agreed to go outside in a semi recessed box directly below boiler with external gas risers , Now the main contractor has said they don't want to see the gas risers and have agreed with the utility company to build a separate meter housing compartment to the front of the block from there we have been asked to run the supply in track pipe in the ground to the building into a riser cupboard were the water mains are ,

The problem this has caused now is the from meter to boiler is approximately 41 meters to the top floor flat

25 meters of trackpipe with 4 sweeping bends

16 meters in copper with 13 elbows which goes through AECV in the cupboard

My initial thoughts are we are going to be over the 0.035 installation volume to run a worcester 30 si compact as this needs 3.24m3/hr i think 28mm will have more than a 1mb drop from meter to appliance with the length of run and bends calculated,

Need to do the maths on it tonight when back

Been told they cant fit the meters internal in a riser cupboard as the door to that cupboard opens internally into the communal space , can any one clarify this ?, apparently the cupboards needs to be accessed from outside the building with an external door , this is not possible as it's in the middle of the building

Thanks for your help guys sorry for the long text
 
IVT

25 meters of 28mm tracpipe
0.00064 per m of trac pipe
0.00064 x 25 = 0.016 iv

16 meters of 28mm copper
0.00054 x 16 = 0.00864 + 10% 0.009504 iv
meter U6 0.008 iv

0.016 + 0.009504 + 0.008 = 0.0335.04 ivt

Loading

34kw requiring 3.19m3/h

25 meters of 28mm tracpipe with 4 sweeping bends

0.3 x 4 = 1.2m

total length 26.2m suitable for 3.7m3/h

16 meters of 28mm pipe plus 13 elbows

0.80 x 13 = 10.4m

16 + 10.4 = 26.4m

total length 27m suitable for 5.06m3/h
 
IVT

25 meters of 28mm tracpipe
0.00064 per m of trac pipe
0.00064 x 25 = 0.016 iv

16 meters of 28mm copper
0.00054 x 16 = 0.00864 + 10% 0.009504 iv
meter U6 0.008 iv

0.016 + 0.009504 + 0.008 = 0.0335.04 ivt

Loading

34kw requiring 3.19m3/h

25 meters of 28mm tracpipe with 4 sweeping bends

0.3 x 4 = 1.2m

total length 26.2m suitable for 3.7m3/h

16 meters of 28mm pipe plus 13 elbows

0.80 x 13 = 10.4m

16 + 10.4 = 26.4m

total length 27m suitable for 5.06m3/h
Top man cheers shaun
 
pressure drop with a loading of 3.20m3/h

28mm trac pipe

25m = 0.451 mbar

28mm copper

16m = 0.432 mbar

total pressure loss 0.883

estimated not very good at pressure losses
 
if you upped the trac to 32mm you ivt would be

0.0275 + 0.00950 + 0.008 = 0.045 ivt

just for reference
 

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