Cryogenic functional testing

The Cryogenic Test is a special test used to test the tightness of the valve (both in floating and trunnion versions) at low temperatures from -36 ° C to -196 ° C with liquid nitrogen.

Positioning of the valve in the cryogenic tank and checking of all connections.
Slow injection of liquid nitrogen in a cryogenic tank.
When the required temperature is reached, the test gas is introduced into the valve at the pressure indicated by the testing procedure.
During the test, any leaks to the outside are detected and quantified by a leak detector, the Sniffer (control instrument).
Any internal leaks, on the other hand, are detected in the classic way with manometers and bubble counters.
The temperature is kept constant and is monitored by a thermocouple inserted inside the valve which displays the exact value in ° C on a display.
At the end of the test a report is generated, the valve is depressurized and gradually brought to room temperature.