Technical manual
MT 208-E
2
PRECAUTION
GENERAL PRECAUTION
The apparatus described in this manual is a device subject to pressure
installed in systems under pressure.
The apparatus in question is normally installed in systems for
transporting flammable gases (natural gas, for example).
PRECAUTION FOR THE OPERATORS
Before proceeding with installation, commissioning or maintenance,
operators must:
Examine the
safety provisions
applicable to the installation in
which they must work;
Obtain the
authorisations
necessary for working when
required;
Use the necessary means of
individual protection
(helmet,
goggles, etc.);
Ensure that the area in which they operate is fitted with the
means of
collective protection
envisaged and with the
necessary
safety indications
.
HANDLING
The handling of the apparatus and of its components must only be
carried out after ensuring that the lifting gear is adequate for the
loads
to lift
(lifting capacity and functionality). The apparatus must be
handled using the
lifting points
provided on the apparatus itself.
Motorised means must only be used by the persons in charge of them.
PACKING
The packing for transportation of equipment and of relevant spare parts
are designed and shaped to avoid damage to any part during
transportation, warehousing and handling activities. Therefore the
equipment and spare parts shall be kept into their packing until their
installation in the final site. After packing is open, check that no
damage occurred to any goods. If damage occurred inform the supplier
and keep packing for any verification.
INSTALLATION
The installation of the pressure regulator has to occur in compliance
with the provisions (laws or standards) in force in the place of
installation.
Natural gas plants have to show features in compliance with the law
provisions and standard requirements in force in the place of
installation or at lease in compliance with standards EN 12186 or EN
12279. In detail, it is necessary to meet the provisions of paragraphs
6.2, 7.5.2, 7.7, 9.3 of the standard EN 12186 and 6.2, 7.4, 7.6, 9.3 of
the EN 12279 standard. The installation in compliance with such
standards minimizes the risk of fire hazard and the formation of
potentially explosive atmospheres.
The valve is not equipped with external pressure limitation devices;
therefore, it has to be installed making sure that the operating pressure
of the assembly on which it is installed does not exceed the maximum
allowable pressure (PS).
Therefore, the user, as deemed necessary by the same, shall install on
the assembly suitable pressure limitation systems, as well as provide
the plant with suitable relief or drain systems in order to discharge the
pressure and fluid contained in the plant before proceeding with any
inspection and maintenance activity.
If the installation of the apparatus requires the application of
compression fittings
in the field, these must be installed following the
instructions of the manufacturer
of the fittings themselves. The
choice of the fitting must be compatible with the use specified for the
apparatus and with the specifications of the system when envisaged.
COMMISSIONING
Commissioning must be carried out by
adequately trained personnel.
During the commissioning activities, the personnel not strictly
necessary must be ordered away and the no-go area must be properly
signalled (signs, barriers, etc.).
Check that the settings of the apparatus are those requested; if
necessary, reset them to the required values in accordance with the
procedures indicated in the manual.
When commissioning, the risks associated with any discharges into the
atmosphere of flammable or noxious gases must be assessed.
In installations in natural gas distribution networks, the risk of the
formation of explosive mixtures (gas/air) inside the piping must be
considered.
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