Technical Manual
MT 188-E
9
5.0
TROUBLESHOOTING
Table 2 here below shows some of the anomalies that may happen
along the time having different nature. These are phenomena linked to
the gas conditions, as well as, of course, to the natural ageing 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 of the equipment due to the use of not qualified
personnel relieves Pietro Fiorentini SpA from any liability whatsoever.
Therefore, you are kindly invited to have your personnel entrusted with
maintenance become qualified or to avail yourself of our customer
service centers (CART), which are officially authorized by us.
5.1
SLAM-SHUT VALVE SBC 187 (Tab. 2)
PROBLEM
POSSIBLE CAUSES SOLUTION
The obturator does
not close
Break of the membrane
or O-ring pos. 43
Replacement
Leak from the
slam-shut
obturator
Obturator gasket pos. 1
fig. 12 worn
Replacement
O-ring (pos. 15 fig. 13)
of the obturator gasket
(pos. 1 fig. 12) worn
Replacement
Valve seat (Pos. 4 Fig.
12) eroded or scratched
Cleaning /
Replacement
Wrong release
pressure
Wrong calibration of the
min. and/or max.
pressure spring
Recalibrate
acting on the
ring nuts
Lever mechanisms
subject to friction
Replace the
release device
casing
It is not possible to
perform restoration
The cause, which led to
the pressure increase
or decrease
downstream, persists
Reduce or
increase the
downstream
pressure
Broken or splintered
lever mechanisms
Replace the
release device
casing
NB.
If the slam-shut valve tripped, first of all close the inlet and outlet
valves (V1 and V2, Fig. 6) of the line and discharge the pressure.
Solve the causes, which led to the tripping, before restoring the
equipment.
In case of malfunctions and not having qualified personnel available for
the specific intervention, contact our customer service center closer to
you. For any further information, refer to our customer service
at our plant in Arcugnano (VI), Italy.
CAUTION
At the end of the procedure, connect the control
head back to the downstream pressure connection
point.
