Gas pipe volume - commercial

[Scott_D]

Does anyone have a chart for gas pipe volume for commercial sizes?
I need info for 54mm to 108mm stainless steel or copper pipe, Volume of gas per meter of pipe.
I cant find my book that has it. Thanks

 

[albatross]

use Pi R squared times the length.

 

[Ermintrude]

Don't forget to calculate in meters

((54/2000)^2)*length

 

[Dotty]

use Pi R squared times the length.

Doesn't work.

I'll upload a crib sheet later.

 

[tamz]

Its in ige up 1 54mm copper is 0.0021 64 is 0.033

 

[Ermintrude]

That's exactly the same as above calculation!

 

[Dotty]

Table B12 Pipe Volumes

Material & Nominal​ Size of Pipe​	Volume of 1m​ Length of Pipe​ (m[SUP]3[/SUP])​	Material and​ Nominal Size​ of Pipe (mm)​	Volume of 1m​ Length of Pipe​ (m[SUP]3[/SUP])​
(mm)​	(in)​
Steel / Stainless Steel​		MDPE SDR 11​
15​ 20​ 25​ 32​ 40​ 50​ 65​ 80​ 100​ 125​ 150​ 200​ 250​ 300​ 350​ 400​ 450​	½​ ¾​ 1​ 1¼​ 1½​ 2​ 2½​ 3​ 4​ 5​ 6​ 8​ 10​ 12​ 14​ 16​ 18​	0.00024​ 0.00046​ 0.00064​ 0.0011​ 0.0015​ 0.0024​ 0.0038​ 0.0054​ 0.009​ 0.014​ 0.02​ 0.035​ 0.053​ 0.074​ 0.089​ 0.118​ 0.151​	20​ 25​ 32​ 55​ 63​ 75​ 90​ 125​ 180​ 250​ 315​ 355​ 400​ 150​ 500​ 560​ 630​	0.00019​ 0.00033​ 0.00053​ 0.0016​ 0.0021​ 0.0029​ 0.004​ 0.008​ 0.017​ 0.032​ 0.051​ 0.056​ 0.083​ 0.105​ 0.129​ 0.162​ 0.205​
Copper​		MDPE SDR 17​
15​ 22​ 28​ 35​ 42​ 54​ 67​		0.00014​ 0.00032​ 0.00054​ 0.00084​ 0.0012​ 0.0021​ 0.0033​	90​ 125​ 180​ 250​ 315​ 355​ 400​	0.005​ 0.01​ 0.02​ 0.038​ 0.061​ 0.077​ 0.098​

+ 10% for fittings.

 

[Dotty]

Table B13 Gauges and their Limitations

Type of Gauge​	Typical Range​ (mbar)​	Typical Readable Movement​ (GRM) (mbar)​	Typical Maximum​ TTD (Mins)​
Water (SG 1.0)	0 – 120	0.5	30​
High SG (SG 1.99)	0 – 200	1	45​
Electronic (1 decimal place)	0 – 200	0.5	30​
Electronic (2 decimal places)	0 – 200	0.1	15​
Electronic (1 decimal place)	0 – 2,000	0.5	30​
Electronic (No decimal place)	0 – 20,000	5	60​
Mercury (SG 13.5)	0 – 1,000	7	60​

Always Ensure TTD is Less Than or Equal to the Maximum Permitted Time for the Gauge being used. Should TTD exceed the Maximum Permitted Time then the installation will have to be divided into sections and tested separately.

Table B14 Factor F1 using Fuel Gas at OP

Gas Type​	Factor F1​
Natural Gas	42​
Butane	128​
Propane	102​

Table B16Factor F3

Fuel Gas at OP (all gases)

0.059​

[FONT=&amp]
[/FONT] Table B17 MPLR for different locations

Gas Type​	MPLR (m[SUP]3[/SUP] h[SUP]-1[/SUP] (st))​
LOCATION OF PIPEWORK​
Inadequately ventilated areas (Area Type A)	Adequately ventilated internal area volume <60m[SUP]3[/SUP]	Adequately ventilated internal area. Volume >60m[SUP]3[/SUP]. External, exposed or buried. (Area Type C and D)
Rate per m[SUP]3[/SUP] of smallest space volume (Area Type B)
Natural Gas	0.0014	0.0005	0.03
Butane	0.00044	0.00016	0.0098
Propane	0.00057	0.0002	0.0123

Table B18 Formulae

	ALL NEW, AND EXISTING IN AREA TYPE A​	EXISTING IN AREA​ TYPE B​	EXISTING IN AREA ​ TYPES C & D​
TTD (mins)	GRM x IVt x F1​		2.8 x GRM x IVt x F1​		0.047 x GRM x IVt x F1​
	Room Volume​

Table 18a Meter Volumes

Designation of Meter​	Installation Volume, IVm (m[SUP]3[/SUP])​
G4/U6​	0.008​
U16​	0.025​
U25​	0.037​
U40​	0.067​
U65​	0.100​
U100​	0.182​
U160​	0.304​
RD or Turbine​	0.79 x d[SUP]2[/SUP] x L​
Domestic Ultrasonic​	0.0024​

(Note: Number designates maximum volume of gas per hour through meter, e.g. U65 allows 65m[SUP]3[/SUP]/hr)
Calculation for Maximum Permitted Leak Rate in m[SUP]3[/SUP].

F3 x GM[SUB]corr[/SUB]x IVt​

TTD
Where GM[SUB]corr[/SUB]is TTP at start of TTD minus TTP at end of TTD e.g.

TTP start 21.03mbar
TTP end 20.57mbar
GM[SUB]corr[/SUB] 0.46mbar

 

[Scott_D]

Many thanks Croppie