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Useful
leak specification guidelines
| Product/Component |
Test
Pressure |
Leak |
Test
Method |
| WATER LEAKS/COOLING SYSTEMS |
1 to 2 bar |
4 to 7 cc/min |
Air pressure decay |
| OIL LEAKAGE (various) |
0.1 to 7 bar |
6 to 15cc/min |
Air pressure decay/flow |
| FUEL/DIESEL |
1 to 10 bar |
0.1 to 15cc/min |
Air pressure decay |
| FUEL/PETROL |
1 to 5 bar |
3.0 to 15cc/min |
AirPressure decay |
| REFRIGERATION/AIR CONDITIONING |
2 to 20 bar |
5 to 15 gm/yr |
Tracer gas |
| ELECTRICAL HOUSING/CONNECTORS |
0.1 to 1 bar |
0.01 to 1cc/min |
Pressure decay/Tracer |
Bubbles to
leak conversion
| cc/sec (ml/sec) |
mm3/sec |
cc/min (ml/min) |
1 cc (1 ml) |
2mm bubble |
| 0.1 |
100 |
6 |
10 sec |
24 bubbles per
sec |
| 0.01 |
10 |
0.6 |
100 sec |
2 bubbles per
sec |
| 0.001 |
1 |
0.06 |
16.7 min |
4.2 secs |
| 1x10-4 |
0.1 |
0.006 |
2.8 hours |
41.9 secs |
| 1x10-5 |
0.01 |
6x10-4 |
27.8 hours |
7.0 min |
| 1x10-6 |
0.001 |
6x10-5 |
11.6 days |
69.8 min |
| 1x10-7 |
1x10-4 |
6x10-6 |
16.5 weeks |
11.6 hours |
| 1x10-8 |
1x10-5 |
6x10-7 |
3.2 years |
4.8 days |
| 1x10-9 |
1x10-6 |
6x10-8 |
31.8 years |
6.9 weeks |
| 1x10-10 |
1x10-7 |
6x10-9 |
318 years |
1.33 years |
Pressure
conversion chart
| To
convert from to (multiply by) |
bar |
psi |
kPa |
kg/cm2 |
mbar |
Pa |
inH20 |
mmHg |
| bar |
1 |
14.5 |
100 |
1.02 |
1000 |
100000 |
401 |
750 |
| psi |
0.069 |
1 |
6.9 |
0.07 |
68.97 |
6896.55 |
27.66 |
51.72 |
| kPa |
0.01 |
0.145 |
1 |
0.01 |
10 |
1000 |
4 |
7.5 |
| kg/cm2 |
0.981 |
14.23 |
98.14 |
1 |
981.35 |
98135 |
393.52 |
736 |
| mbar |
0.001 |
0.015 |
0.1 |
0.001 |
1 |
100 |
0.4 |
0.75 |
| Pa |
1E-05 |
1.4E-04 |
0.001 |
1.02E-05 |
0.01 |
1 |
0.004 |
0.0075 |
| in H2O |
0.0025 |
0.036 |
0.249 |
0.0025 |
2.49 |
249.38 |
1 |
1.87 |
| mm Hg |
0.0013 |
0.019 |
0.133 |
0.0014 |
1.33 |
133.33 |
0.535 |
1 |
Leakage
flow rates conversion chart
| To convert from ….to (multiply by) |
atmcc/sec |
m bar.l/sec |
atm mm3/sec |
atmcc/min |
atmLitre/min |
atm m3/min |
atmcu ft/yr |
torr.l/sec |
| atm cc/sec |
1 |
1.013 |
1000 |
60 |
0.06 |
6E-05 |
1116 |
0.759 |
| mbar.l/sec |
0.987 |
1 |
987 |
59.23 |
0.059 |
5.9E-05 |
1101 |
0.75 |
| atm mm3/sec |
0.001 |
0.001 |
1 |
0.06 |
6E-05 |
6E-08 |
1.116 |
0.0007 |
| atm cc/min |
0.0167 |
0.017 |
16.67 |
1 |
0.001 |
1E-06 |
18.6 |
0.012 |
| litre/min |
16.67 |
16.88 |
16667 |
1000 |
1 |
0.001 |
18601 |
12.67 |
| atm m3/min |
16667 |
16883 |
16666667 |
1000000 |
1000 |
1 |
18601190 |
12664 |
| cu ft/yr |
0.0009 |
0.0009 |
0.896 |
0.054 |
5.37E-05 |
5.37E-08 |
1 |
0.0007 |
| torr.l/sec |
1.316 |
1.33 |
1316 |
78.96 |
0.0789 |
7.89E-05 |
1468 |
1 |
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TQC Ltd, Hooton Street, Carlton Road,
Nottingham, NG3 2NJ, United Kingdom
Tel: +44 (0)115 9503561
Fax: +44 (0)115 9484642
E-mail: sales@tqc.co.uk
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