Leakage Detection/Fugitive Emissions Calculations and Units

Manufactures, based on the requirements of the projects and applicable standards (e.g. ISO 15848-2:2015) may use some physical dimensions for leakage or fugitive emissions which is different from the equipment used on site. Conversion table below helps you to convert these values easily.

Good to Know: The natural amount of helium4 in the atmosphere amounts to 5·10–4 volume percent ( = 5 ppm). When it is concerned with ppm concentration of Helium, the following equations are applicable according to EN 1779 annex B:1 ppm He = 2.5 * 10-8 cm³ /s = 2.5 * 10-7 Pa* m³ /s 1 ppm = 25 mbar*l/s or 1 mbar*l/s = 0.04 ppm

Leak rate / Tightness
	atm.cc/s	mbar.l/s	torr.l/s	Pa.m3/s	sccm
1 atm.cc/s	1	1	0,76	0,1	60
1 mbar.l/s	1	1	0,76	0,1	60
1 torr.l/s	1,3	1,3	1	0,13	80
1 Pa.m3/s	10	10	7,5	1	600
1 sccm	0,016	0,016	0,0125	0,0016	1

Pressure
	Torr	mbar	Pa	mTorr	psi	atm
1 Torr	1	1,33	133	1 000	0,0193	0,00132
1 mbar	0,751	1	100	750	0,014	0,0009
1 Pa	0,00751	0,01	1	7,5	0,00014	0,000009
1 mTorr (micron)	0,001	0,0013	0,13	1	0,000019	0,0000013
1 psi	51,72	68,96	6 896	51 710	1	0,07
1 atm	760	1 013	101 300	760 000	14,7	1

Pumping speed
	cfm	l/min	l/sek	m3/hod
1 cfm	1	28,32	0,472	1,6977
1 l/min	0,035	1	0,016	0,06
1 l/sec	2,12	60	1	3,6
1 m3/hrs	0,589	16,67	0,27	1

Volume
	inch3	ft3	litr	cm3	m3
1 inch3	1	0,00056	0,0163	16,38	0,000016
1 ft3	1 728	1	28,316	28 316	0,0283
1 litr	61,02	0,035	1	1 000	0,001
1 cm3	0,061	0,00003	0,001	1	0,000001
1 m3	61 023	35,33	1 000	1 000 000	1