13
MT 237 – EN ed.2015 (Rev.A)
5.0
TROUBLESHOOTING
Some of the operational anomalies that may occur from time to time, are described below. These are phenomena linked to the gas
conditions, as well as, of course, to the natural aging and wear of the materials.
Please note that all interventions on the equipment
must be performed by technically qualified personnel having suitable knowledge
on the matter.
The tampering and improper use of the equipment by non-qualified personnel relieves Pietro Fiorentini SpA from any liability
whatsoever.
5.1
ANOMALIES OF THE SLAM-
SHUT VALVE DILOCK…
Table 5.1 describes the possible malfunctions that may occur over time
INCONVENIENCE
POSSIBLE CAUSES
INTERVENTION
The blocking obturator does not close
Breakage of the membrane [536] of
the measuring head
Replacement
Leak from the slam-shut valve
obturator
Obturator gasket [526] deteriorated
Replacement
Obturator seat eroded or scratched
Replacement
Wrong release pressure
Wrong calibration of the min. and/or
max. spring
Perform the calibration again by
acting on the ring nuts [549] and/or
[549]
Lever mechanisms subject to friction
Change the box containing the entire
assembly
It is not possible to perform restoration
The cause that led to the pressure
increase or decrease downstream
does persist
Let downstream pressure drop or
increase it
Broken or splintered lever
mechanisms
Change the standard box containing
the assembly outside the regulator
NB.
If the slam-shut valve tripped, first of all close the inlet and outlet valves (V1 and V2) of the line and discharge the pressure.
Solve the causes, which led to the tripping before restoring the equipment.
In case of malfunctions, if there is no qualified personnel available for the specific intervention, contact our customer service centre nearest
to you. For any further information, refer to our SATRI service at our plant in Arcugnano (VI), Italy.
