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TQC Medical
A Division of TQC Ltd
Hooton Street
Nottingham NG3 2NJ
Tel: +44 (0) 115 9503561
Fax: +44 (0) 115 9484642
(c) TQC Ltd
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Leak
Test
Tables
of guideline figures and conversions
|
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 |
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 |
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 |
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