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MT 235 – EN ed.2015 (Rev.A)
GENERAL WARNINGS
The equipment described in this manual is a device subject to pressure installed in systems under pressure.
The involved equipment is usually embedded in systems conveying flammable gases (e.g. natural gas).
WARNINGS FOR THE OPERATORS
Before performing the installation, commissioning or maintenance, the operators must:
go through the safety provisions applicable to the installation where they have to operate;
obtain the necessary authorizations to operate, when required;
be equipped with the necessary personal protective equipment (helmet, goggles, etc.)
make sure that the area in which they have to operate is equipped with the required collective protections as well as
with the necessary safety signs.
PACKAGING / TRANSPORT / STORAGE
The packaging materials used for transporting the equipment and the related spare parts have been designed and
manufactured to avoid damages during normal transport, storage, and related handling. Therefore, the equipment and spare
parts must be kept in their respective original packages till their installation in the final destination site. When the packages are
opened, it is necessary to verify the integrity of the materials therein contained. In case of damages, report the detected
damages to the suppliers preserving the original package to allow the performance of necessary inspections.
The storage of the equipment, even after its use, must occur in suitable places, free of moisture and away from sources of light
and heat, within the limits stated on the rating plate
HANDLING
The handling of the equipment and its components must be performed after having established that the lifting means are
suitable for the loads to be lifted (lifting capacity and functionality) in order to avoid bumps, impacts and local stresses.
When necessary, the handling of the equipment must be performed using the lifting points foreseen on the equipment itself. The
use of motorized means is reserved to authorized personnel only.
INSTALLATION
The installation of the pressure regulator must occur in compliance with the provisions (laws or regulations) in force in the place
of installation.
In detail, natural gas plants must show features complying with the law provisions or regulations in force in the place of
installation or at least complying with the standards EN 12186 or EN 12279. The installation in compliance with such standards
minimizes the risk of fire and the formation of potentially hazardous atmospheres.
The equipment is not provided with internal pressure limitation devices; therefore, it must be installed making sure that the
operating pressure of the installation in which it is installed does not exceed the value of the allowable maximum pressure (
PS
).
The user shall therefore, when he/she deems it necessary,
provide for the installation on the assembly of suitable pressure limitation systems; Moreover, the user shall equip the plant with
suitable relief or drain systems in order to be able to discharge the pressure and the fluid contained in the plant before
proceeding with any inspection and maintenance activity.
Should the installation of the equipment require the installation on site of compression fittings, these latter have to be installed
following the instructions provided by the manufacturer of the fittings. The selection of the fittings must be compatible with the
use specified for the equipment and with the plant specifications, when foreseen.
COMMISSIONING
The commissioning must be carried out by
suitably trained personnel
.
During the commissioning, the personnel not strictly necessary must be kept away and the limited access area must be properly
marked (signs, barriers, etc.).
Verify that the equipment calibrations are the ones required. If necessary, restore the required values for the same as provided
for later on in this manual.
During the commissioning, the risks determined by any discharges to the atmosphere of flammable or noxious gases must be
assessed.
For installation on natural gas distribution networks, it is necessary to consider the risk of formation of a (gas/air) explosive mix
within the piping.
COMPLIANCE WITH DIRECTIVE 97/23/EC (PED)
The regulator
Dival 500
is classified as pressure accessory pursuant to Directive 97/23/EC (PED).
The regulator
Dival 500
with embedded slam-shut device and pressure switch tripping in case of maximum pressure is
classified as safety accessory pursuant to the PED Directive and, therefore, it can be used as both a pressure accessory and a
safety accessory, always pursuant to the PED Directive.
The configuration with active regulator and monitor regulator in line is defined as a safety accessory according to the PED
Directive. In this case, the user is responsible for verifying that the allowable maximum pressure (
PS
) of the pressure equipment
to be protected is compatible with the calibration of the monitor regulator and its lockup pressure class (
SG
).
