Dungs FRM-NOC 100025 HD, Instruction Manual, Page: 39 / 76

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MC • Edition 2022.08 • No
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12. Commissioning, decommissioning and recommissioning FRM-NOC or SAV
12.3 Leakage test
Prior to commissioning and recomissioning
• The performance data on the type plate must correspond to the ordering data.
• Prevent explosive gas-air mixture: the room atmosphere must constantly be monitored
using appropriate gas concentration measuring devices for the detection of gas leakages.
• Operate the device only if all safety devices are fully functional.
• Only qualified personnel is allowed to carry out the commissioning.
12.1 General information
Lekspray
pmax = 10 bar
1
2
Before commissioning the device, a test for
internal and external leakages must be carried out.
1. Test gases for the leakage test: Use air or inert gases.
2. Upstream and downstream shutoff valves must be closed.
3. Release all pressure from the test section. Check the
presence of gas and safely release to the atmosphere.
4. If test pressure > blow-off pressure SBV: block the line
upstream of the SBV.
5. Connect the test section to the test device.
6. Test pressure: 1.1 x system-specific operating pressure
Maximum PS of the device (SAV 100... 10 bar/SAV 60...
6 bar). If different pressure ratings of the system must be
taken into account. If a relief valve (SBV) is installed in the
test section, either the test pressure > SBV relief valve
pressure setting or block the line upstream of the SBV and
test at 1.1 x system-specific operating pressure maximum
PS of the device.
7. Observe the waiting time necessary for the pressure com -
pensation (pressure equilibrium) according to the system-
specific volumes. A minimum of one minute is required to
reach pressure equilibrium.
External leakage test
8. Use a suitable leak detection spray on the device.
9. Monitor the foam formation.
Internal tightness test for SAV only
10. Remove the pressure in the test section downstream of
the SAV and verify that SAV is closed.
11. Monitor the increase in pressure on the outlet side: pres -
sure gauge accuracy 0.1 mbar. The SAV passes the test
if there is no pressure increase for five minutes.
12. Once the leakage test has been carried out, open the
shutoff valve upstream of the SBV, if installed.
13. Release pressure in the test section, if test failed.
12.2 Initial Pressurization of FRM
1. When first applying pressure to the FRM or SAV, apply
pressure slowly to prevent overpressure conditions or
damage. This also allows all mechanisms to properly
engage.
2. While slowly apply pressure, apply the pressure in
"pulses" (open the main valve upstream 5-10% of
stroke for about 1-2 seconds and then close it for 10-20
seconds) and repeat until the operating or test pressure
is achieved. Large pressure and volumes of pipe require
longer waiting times (e.g. 20 s) before applying another
pulse.
3. It is recommended to monitor the pressure rise using a
pressure gauge in the test section to prevent overpres -
sure conditions.