PIETRO FIORENTINI NORVAL, Installation, Commisioning And Maintenance Instructions

Page: 35 / 59

TECHNICAL MANUAL MT044
35
7.1 GENERAL
Periodical inspection and maintenance shall be carried out according to the regulations in force (kind and
frequencies). Before carrying out any operation it is important to ascertain that the regulator has been cut off both
upstream the regulator and the on/off valves.
The maintenance operations are closely associated with the quality of the gas transported (impurities, humidity,
gasoline, corrosive substances) and with the efficiency of the filtering.
Preventive maintenance should be carried out at intervals which, if not established by regulations in force, depend
on:
- the quality of the gas transported;
- the cleanliness and conservation of the piping upstream from the regulator: in general, for example, when
starting the equipment for the first time, more frequent maintenance is required because of the precarious state
of cleanliness inside the piping;
- the level of reliability required from the regulation system.
Before starting the disassembly operations on the apparatus you should check that:
- a set of recommended spares is available. The spares must be original Fiorentini ones, bearing in mind
that the more important ones such as diaphragms are marked
- A set of wrenches is available as specified in table 11.
For a proper maintenance the reccomended spare parts are unequivocally identified by labels indicating:
- The No of assembly drawing SR of the apparatus for which the spare parts are suitable,
- The position showed in the assembly drawing SR of the apparatus
N.B. The use of non-original spare parts relieves us of all responsibilities.
In the maintenance is carried out by your own authorized personnel, we reccomend putting reference markings,
before the disassembly, on those parts which could have directional or reciprocal positioning problems when
reassembling. Finally, we would remind you that O-Rings and sliding mechanical components (rods, etc.) must be
lubricated, before the re-assembly, with a fine layer of silicone grease. Before recommissioning of equipment after
maintenance, external tightness shall be verified at appropriate pressure to assure no external leakage. When
equipment is used as safety accessory to PED, internal sealing shall be verified at appropriate pressure to assure
the internal sealing at the maximum expected operating pressure. Both verifications are essential to assure safe
use at foreseen operating conditions; they have, anyhow, to comply with the national regulations in force.
7.0 MAINTENANCE