86
GOVERNORS NOR
TH AMERICA
US
LOW PRESSURE GAS REGULATOR
|
MAINTENANCE AND FUNCTIONAL TESTING
|
REV. A
Operation, maintenance and warning manual
9.2 - PERIODIC CHECKS AND VERIFICATIONS OF PROPER OPERATION
Checks and inspections should be carried out only by licensed technicians.
Periodic checks and inspections
Operator qualification
• Commissioning technician.
PPE required
The PPE listed in this chart relates to the risk associated with the equipment.
For the PPE required to protect against risks associated with the workplace,
installation or operating conditions, refer to:
• the regulations in force in the country of installation;
• any indications provided by the Safety Manager at the installation facility.
Tab. 9.56.
9.2.1 - FUNCTIONAL CHECKS OF SAFETY DEVICES
To perform functional checks of safety devices, it is necessary:
• that there is a shut-off valve downstream of the regulator in the system;
• that the system is set up with a pressure tap downstream of the regulator or that the regulator is accessorized with an
integrated pressure tap (see Section 4.6.3);
• have an external pressure source with pressure control available;
• that the external pressure source is connected to a pressure gauge and a tap with a maximum passage cross-section
of 4 mm.
Leakage of gas into the environment must be kept to an absolute minimum.
To minimize gas leakage to the atmosphere, perform the connection/disconnection operations of the ex-
ternal source as quickly as possible.
To check the safety devices, proceed as described in Tab. 9.57.:
Step Operation
1
Close the valve located downstream of the regulator.
2
Set up the external pressure source with corresponding pressure gauge to monitor pressure.
The maximum pressure fed downstream of the regulator must not exceed 400 mbar.
3
Connect the external pressure source to the pressure tap present downstream of the system or, if existing, to
the pressure tap located on the regulator.
Refer to section 4.6.3.1 for the use of the pressure tap mounted on the regulator
4a
Check pds (regulated pressure)
:
1. Open the tap of the external pressure source;
2. Verify that the pds value is ±10% from the value indicated on the applied identification plate.
4b
Internal tightness check
:
1. close the tap of the external pressure source;
2. check that the downstream pressure value is stable over time (wait about 2 minutes).
5
Disconnect the external pressure source tap.
Summary of Contents for 30051
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