Manntek DCC - Operation; General Notes and Daily Inspection

10 of 10 - Version 181002
TEST
PROCEDURE
After each service a tightness test of each coupling is mandatory.
The following test parameters are in accordance with EN12266 and EN14432:
Test procedure
Test pressure
Acceptance criteria
Tightness test (liquid
nitrogen)
6 bar +/- 1 bar
No visually detectable
leakage for the duration of
the test
Table 1 – Test pressure
Size
Cooling down
Keeping time
DN 25
5 min
30 s
DN 50
10 min
45 s
DN 65
12 min
60 s
DN 80
15 min
60 s
DN 100
18 min
90 s
DN 150
20 min
120 s
Table 2 – Minimum test duration
TEST PROCEDURE:
• Connect the hose unit to the tank unit
• At the beginning the couplings shall be cooled down by opening the tank with liquid
nitrogen for the cooling down time specified in Table 2.
• Maintain the test pressure for the keeping time specified in Table 2.
• Determine the leakage rate.
• Disconnect the hose unit and the tank unit.
• Maintain a test pressure of 5 bar in the tested unit(s) for the keeping time specified in
Table 2
• Determine the leakage rate while depressurizing the units.
STORAGE
Store coupling in a dry, dust free, dark place, in ambient temperature.
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prices, materials, specifications and models and to discontinue models without notice or obligations.