Leak testing
can be carried out at three pressure levels depending on the
mechanical strength of the equipment to be tested.
| The
three pressure levels are: |
| 1.5 psi (10.3 Kpa) |
| 2.5 psi (17.2 Kpa) |
| 5.0 psi (34.4 Kpa) |
| |
Leak testing with the NEPS nitrogen purge system is
a simple operation and has a sensitivity which is related to pressure
degradation against time. The NEPS nitrogen purge system
has a display resolution of 0.01 psi allowing users to achieve high
sensitivities depending on the monitored time for the equipment
under test to degrade from the initial test pressure.
The rate of leakage must take
into consideration the equipment volume.
 Typical Sensitivities for NEPS 1000 are:
60 Minutes to degrade by 0.01 psi
1,000 cc volume = 1.9 x 10-4 cc/second
10,000 cc volume = 1.9 cc x 10-3 cc/second
Caution: Leak testing must be conducted with a stable/constant ambient/equipment temperature. A variation of 3.6°F
(2°C)
can
cause up to a 0.1 psi change in pressure.
|
