6 OPERATION
LACO Technologies
TITAN VERSA Operations and Maintenance Manual
53
The following accessories can aid in sniff leak testing. See Accessories or visit
http://www.lacotech.com for more details.
•
Sniffer Probe
•
LHREG-01, 0-100 psi bottle regulator for helium gas (P/N: CGA580)
•
Gas Charge Manifolds
6.4.3.1.
Sniff Leak Testing Tips
•
When using a helium sniffer probe to test pressurized components or systems,
ensure there are no gross leaks in the system prior to pressurizing. Gross leaks will
allow the surrounding air (or background) to become contaminated with helium,
which lowers the sensitivity of the leak test.
•
When venting helium from a pressurized test part, do not vent in the same area where
the testing is performed; this will contaminate the surrounding air with helium.
•
When the ambient air is contaminated with helium, a large fan can be used to
exhaust the test area and provide clean air.
•
When sniffing a part with multiple potential leak locations, always begin sniffing
near the bottom of the part and work towards the top. It may be necessary to
repair leaks that are found before proceeding. Helium escaping from the part will
rise and can give a misleading leak location.
Gas Charging Process
Both the Inside-Out and sniffer test methods require the test device to be filled with a
tracer gas. This process should be controlled and repeatable for best leak testing
results. LACO recommends the following general process:
1.
Configure charge manifold as outlined in schematic below. Set helium regulator to
desired test pressure.
2.
Connect test part to charge manifold and turn on evac vacuum pump.
3.
For gross leak check, fill test part with air and close air fill valve. Ensure test part
pressure is stable.
4.
Vent air and close air fill valve.
