44 …60
MC • Edition 2022.08 • No
. 278 349 R
ev
. -0
45 … 60
Work step
Tool designation
Pressure
rating
Wrench size
1
Loosen the pulse lines.
Open-ended spanner (A)
MD/HD/UHD
SW 24
2
Release the setpoint springs.
Open-ended spanner (A)
MD/HD/UHD
SW 24
Hinged hook wrench (D)
90-155
3
Replace the working diaphragm.
Open-ended spanner (A)
MD/HD/UHD
SW 17
Open-ended spanner (A)
SW 13
4
Replace the control plate.
Tube socket wrench (B) / Hammer (E)
MD/HD/UHD
SW 30
5
Loosen bypass pipe.
Open-ended spanner (A)
MD/HD/UHD
SW 14
6
Replace closing shell SAV.
Open-ended spanner (A)
MD/HD/UHD
SW 17
Regulator
14.5 SAV Leakage test
Go to section "12. Commissioning, decommissioning
and recommissioning FRM or SAV" for performing
functional and leakage testing of SAV.
14.6 Recommended maintenance intervals for SAV and FRM
Max. inlet pressure [bar]
Functional test
Maintenance
> 0.1 to 1
every 4 years
every 8 years
> 1 to 5
every 2 years
every 4 years
> 5
once a year
every 2 years
1. The maintenance intervals depend on the system-
specific operating and environmental conditions, gas
quality, state of the pipelines, etc.
2. The maintenance intervals have to be set by the sys
-
tem operator according to the system requirements.
3. It is recommended to perform a functional test on a
monthly base and carry out maintenance works every
year including a leakage testing, in order to guarantee
the system availability.
4. It is necessary to comply at least with the maintenance
intervals specified in G 495.
