113
REV
AL 182
Use, maintenance and warning instructions
MEDIUM PRESSURE REGULATOR
|
COMMISSIONING
|
REV. 00
EN
SPRING CALIBRATION FOR MINIMUM PRESSURE TRIP (IF ANY)
Step
Action
1
Partially open the drain cock (fig. 8.32, ref. 6) to the atmosphere and keep it open for the next steps.
2
Decrease the downstream pressure to the minimum required slam-shut device pressure by turning the main
regulator's pilot adjustment screw.
NOTICE!
Check the pressure referring to the downstream pressure gauge (fig. 8.32, ref. 5).
If the slam-shut valve:
•
trips before the expected pressure value: unscrew (anti-clockwise) the adjustment ring nut
(15) so as to relieve the spring (17);
•
does not trip before the expected pressure value, screw in (clockwise) the adjustment ring
nut (15) so as to further compress the spring (17).
3
Move the lock into the open position by means of the reset lever (16) and keep it open manually.
4
Increase the downstream pressure to the set value of the regulator by turning the main regulator pilot adjust-
ment screw.
5
Reset the slam-shut device.
6
Check the minimum pressure spring for proper calibration by repeating steps 1-2-3-4 at least three times.
7
Close the drain cock (fig. 8.32, ref. 6).
Tab. 8.81.
COMMISSIONING THE REGULATOR
NOTICE!
Refer to paragraph 8.5 “Regulator commissioning procedure” in this chapter.
Summary of Contents for REVAL 182
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