Retsch CryoMill Autofill 50l - Manual (Page 22)

Operating the machine
22
• lubricating spray
• hemp
• open flame
• steam
• leak detection spray
• suds
Pos : 6.28 /00010 Bedi enungsanleitung en Kapitels ammlungen/Cr yoMill/0016 LN 2 D ewar 50l/1610 Modul Dewar 50l Prüfungen des Sicherheits ventiles @ 2\mod_1267800505895_9.doc @ 18921 @ @ 1
Only the bubble method outlined below may be used to test that the safety valve is
securely in place and has the correct response pressure. This prevents the valve
mechanics becoming dirty and rusty . The response pressure is marked on the
safety valve.
4.11 Admitting the test pressure
Use a suitable test device to introduce the test pressure. Where the safety valves
are not to be removed, the vessel’s inherent pressure is used for the test.
Do not conduct the tests with oxygen or inflammable or corrosive gases.
4.12 Checking the seat tightness
Increase the test pressure to 90% of the response pressure. The valve must
remain leak-tight.
4.13 Checking the response pressure
Slowly increase the test pressure to 100%. The safety valve blows off. The
response pressure can deviate from the nominal level by +/- 10%.
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