71
DIV
AL 600
Use, maintenance and warning instructions
MEDIUM PRESSURE REGULATOR
|
COMMISSIONING
|
REV. A
EN
Step
Action
1
1
Partially open the bleed cock (6).
2
2
Partially open the upstream shut-off valve (V1), checking that the downstream pressure (Pd) indicated on the
downstream pressure gauge (5) does not exceed the required calibration value by over 50%.
NOTICE!
In the first line pressurisation phase, the downstream pressure (Pd) indicated on the down
-
stream pressure gauge (5) could exceed that required calibration value, depending on the
response time of the regulator.
NOTICE!
With regulators with calibration pressure up to 80 mbar, the response time is longer than that of
regulators with calibration pressure above 80 mbar.
3
3
When the regulator is put into service, the downstream pressure (Pd) indicated on the downstream pressure
gauge (5) will be equal to the calibration value of the regulator.
4
4
a - FOR INITIAL COMMISSIONING OF THE REGULATION LINE
If the pressure downstream (Pd) is not at the required calibration value, proceed as follows:
• downstream pressure value (Pd) lower than required calibration value: load the setting spring by turning
the adjustment ring nut clockwise (3)
• downstream pressure value (Pd) higher than required calibration value: load the setting spring by turning
the adjustment ring nut anti-clockwise (3)
b - AFTER MAINTENANCE OF THE REGULATION LINE
• load the setting spring (328) and increase the pressure value of the main regulator (1) by turning the ad-
justment ring nut clockwise (3)
5
5
Check the downstream pressure (Pd) referring to the downstream pressure gauge (5).
6
6
Close the bleed cock (6).
7
7
Check that the downstream pressure (Pd), after an increment phase, does not exceed the closing pressure
value (refer to the SG value displayed on the plate, see par."2.8 - Nameplates applied".
NOTICE!
If the pressure in the pipe section between the regulator and the downstream shut-off valve (V2)
exceeds the closing pressure value, consult chapter “10 - Ricerca guasti e troubleshooting”
clear the causes of the malfunctions.
8
8
Check the tightness of all the fittings between the shut-off valves (V1, V2).
NOTICE!
Check for leaks with a foaming agent.
9
9
In case of external leaks, eliminate the leak points and repeat the procedure from step 7.
10
10
Open downstream shut-off valve (V2) very slowly until the pipeline fills completely.
NOTICE!
If the pressure of the downstream pipeline is lower than the calibration pressure, partially open
the downstream shut-off valve (V2) so as to not to exceed the maximum flow rate value of the
installation.
Tab. 8.44
Summary of Contents for Dival 600
Page 156: ...TM0023ENG...
