FläktGroup Multi-DENCO, Руководство по эксплуатации

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Multi -DENCO Medium Connections
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 61
6.3.1 A-Version: Size 010 to 065
For standard units, all devices fitted to the low pressure side of the system are suffi-
ciently pressure rated and can remain connected to the system during pressure
testing.
1: Ensure that the adjacent area is clear of non-essential staff, complete a risk
assessment and establish an exclusion zone for safety purposes.
2: Insert 3.5 bar nitrogen into the unit to identify first fix leaks, if leaks occur, release
the nitrogen, repair the issues and re-insert nitrogen to 3.5 bar.
3: Complete a strength test by pressurising system with dry nitrogen to 47.6 bar and
leave on test for a minimum of 60 minutes.
4: On completion of the strength test drop the pressure down to zero by using the relief
valve on the nitrogen regulator or charging manifold.
5: Repair any leaks found and then repeat steps.
6: If the client or end-user requires witnessing the pressure test, carry out this witness
at this point making notes of dates, times and pressures.
7: At the completion of the pressure test, the Oxygen-Free Nitrogen charge should be
safely purged away leaving a holding charge prior to the evacuation process.
Ensure you have recorded the holding charge in your records at this point.
8: On completion, prepare and sign the 'Pressure Test Certificate' (chapter 13.2).
6.3.2 A-Version: Size 092 & 130
1: Ensure that the adjacent area is clear of non-essential staff, complete a risk
assessment and establish an exclusion zone for safety purposes.
2: Low side strength test; Complete a strength test on the whole system by
pressurising with dry nitrogen to a maximum of 33.0 bar and leave on test for a
minimum of 30 minutes.
3: High side strength test; On completion of step 2, CLOSE THE SUCTION LINE
SHUT OFF VALVE , and increase the dry nitrogen pressure to 47.6 bar and leave
on test for a minimum of 30 minutes.
4: Decrease the pressure to 17.2 bar by using the relief valve on the pressure
regulator or manifold. Re-fit the LP switches, open the suction line valve and
complete a bubble test on the LP switch joints.
5: On completion of step 4, reduce the pressure to zero by using the relief valve on the
nitrogen regulator or charging manifold.
6: Repair any leaks that are found and then repeat steps 1 to 5.
7: If the client or end-user requires witnessing the pressure test, carry out this witness
at this point making notes of dates, times and pressures.
8: At the completion of the pressure test, the Oxygen-Free Nitrogen charge should be
safely purged away leaving a holding charge prior to the Evacuation process.
Ensure you have recorded the holding charge in your records at this point.
9: On completion, prepare and sign the 'Pressure Test Certificate' (chapter 13.2).
NOTICE
During the pressure test, system pressures exceed the maximum values specified
by the supplier. Exceeding these pressures could damage the sensors resulting
in incorrect operation by the unit.
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Ensure low pressure switches are disconnected before pressure testing.