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3.2
Leak Testing
3.2.1
Air/Nitrogen Pressure Leak Testing
a. The piping system upstream and downstream of the motorized ball valves must be checked pressurizing
the piping with 150 psi dry air or nitrogen and applying soapy water to the outside of all pipe joints and
fittings. The two motorized ball valves should remain closed during this leak check.
b. Repair all leaks and re-test. If no leaks are apparent, bleed-off and remove the dry air or nitrogen
pressure source.
3.2.2
Chemical Leak Testing Upstream of Motorized Ball Valve
After a successful pressure test with nitrogen or air, check for leaks in the piping system with the actual
chemical to be dispensed.
NOTE: Household ammonia (stronger ammonia solution may also be used) is used to detect chlorine or
sulfur dioxide leaks. Household chlorine bleach (sodium hypochlorite solution) is used to detect ammonia
leaks.
To check for leaks, use a plastic squeeze bottle about 1/4 full of the leak test solution. Squeeze the
bottle while directing the fumes below all joints and fittings. The appearance of a dense white smoke
indicates a leak.
NOTE: Whether the automatic switchover system is designed for switching sources of liquid or gas, a source
of gas rather than liquid is used for leak testing.
To check for leaks, proceed as follows:
a. Open and immediately close the container gas outlet valve introducing just enough gas to pressurize
the first section of the piping between the source and its respective closed motorized ball valve.
NOTE: All other valves should be open to evacuate the system through the gas feed system downstream
should a leak be detected.
b. Check each joint, connection and fitting by applying fumes below each connection. Use the gas feed
system downstream to evacuate the system before repairing leaks and re-testing.
3.2.3
Chemical Leak Testing Downstream of Motorized Ball Valve
a. Pressurize the piping system downstream of the Side A motorized ball valve by setting the Side A switch
to
OPEN. The OPEN indicator light for Side A will illuminate indicating that the side a motorized ball
valve has opened.
b. With gas present upstream of the valve, opening the valve pressurizes the piping downstream.
c. Close the Side A valve by setting the Side A switch to CLOSE. The CLOSE indicator light for Side A will
illuminate indicating that the Side A motorized ball valve has closed. Leak check all piping, joints and
fittings downstream of the motorized ball valve. Repair all leaks and re-test.
d. Repeat procedure for Side B.
