Technical Manual
MT 188-E
10
6.0
MAINTENANCE
6.1
GENERAL
Maintenance, inspection and operation activities have to be carried out
in compliance with the regulations in force on the matter in the place of
installation of the equipment (type and frequency). Before performing
any kind of intervention, it is important to make sure that the device has
been closed at inlet and outlet and that the pressure has been
discharged from the piping between the valve and the cut-off valves.
Maintenance interventions are strictly bound to the quality of the
conveyed gas (impurities, humidity, gasoline, corrosive substances)
and to the filtration efficiency.
Therefore, it is always recommended to perform preventive
maintenance interventions whose frequency shall be determined
according to the following aspects, unless specified by regulations
already in force:
-
the quality of the conveyed gas;
-
the cleanness and preservation status of the piping upstream of
the regulator: in general, for example, after the first start of the
plants, more frequent maintenance interventions are required if
the internal cleanness of the piping is precarious.
-
the reliability level required from the plant.
Before starting disassembling the equipment make sure:
-
to have a series of original spare parts available. Spare parts
shall be original spare parts by Pietro Fiorentini; consider that
the most important parts such as membranes are marked.
-
to have a series of wrenches as shown in table 10.
For a correct maintenance, suggested spare parts are unmistakably
identified by means of tags bearing the following information:
-
the SR layout drawing number of the equipment in which they
can be used;
-
The position given on the SR layout drawing of the equipment;
It is suggested to replace all rubber parts; for this purpose, use the
suitable spare part kit as highlighted in Fig. 12, 13, 14.
NB.
The use of not original parts relieves Pietro Fiorentini S.p.A. from
any responsibility.
The depressurization procedure shall occur paying attention to
discharge the drains into a safe area; to avoid risks related to the
formation of sparks due to bumps of impurity particles inside the
discharge lines, it is recommended to keep fluid speed lower than 5
m/sec.
Moreover, it is suggested to perform reference marks on the parts
before disassembling those parts that can be positioned or oriented in
more than one way during re-assembly.
Finally, it shall be underlined that O-rings and sliding mechanical parts
(stems, etc.) have to be lubricated before reassembling them, applying
a thin layer of silicone grease. Before commissioning, it is necessary to
verify the external tightness of the equipment at a suitable pressure for
assuring the absence of external leaks.
6.2
MAINTENANCE PROCEDURE FOR THE
SLAM-SHUT VALVE SBC 187
PROGRAMMED PREVENTIVE MAINTENANCE
Procedure for disassembling, completely replacing the spare parts
and reassembling the valve SBC 187.
PRELIMINARY OPERATIONS
A)
Shut off the valves upstream and downstream of the system and open
the drain cock carefully.
B)
Make sure that the pressure upstream and downstream of the device is
equal to zero.
