PIETRO FIORENTINI REFLUX 819/FO, Техническое руководство

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TECHNICAL MANUAL MT103
37
- insert a reference pin 2 in the notch, pressing the knob 1 completely;
- reset the slam-shut device by means of the provided lever;
- keep the knob 1 pressed and:
•) for safety devices which intervention for maximum pressure: slowly increase the auxiliary pressure and
check the intervention value. If necessary, increase the intervention value by turning the adjustment ring
14 clockwise, or anticlockwise to reduce the intervention value.
• ) for safety devices for pressure increase and reduction: slowly increase the auxiliary pressure and record the
intervention value. Restore the pressure to the set-point established for the regulator, and carry out the
slam-shut reset operation. Check intervention for pressure reduction by slowly reducing the auxiliary
pressure. If necessary increase the intervention values for pressure increase or decrease by respectively
turning the rings 14 or 15 clockwise and vice versa to reduce the intervention values.
- check proper operation by repeating the operations at least 2-3 times.
B) On devices without the "push" valve (fig. 22) we recommend connecting the control head separately to a
controlled auxiliary pressure and repeat the operations described above.
ATTENTION
At the end of the operation, reconnect the control head to the downstream pressure take-off.
N.B.: The intervention tests should be repeated at least every 6 months.
At the end of the slam-shut check, proceed as follows:
1) Check that the slam-shut is in the closed position.
2) Put the three wais valve 12 in start-up position (connecting the upstream pipe with the pilot).
3) Very slowly open the inlet on/off valve V1.
4) Very slowly reset the slam-shut valve by actuating the provided lever. In the case of safety devices for
maximum pressure only, the device will stay spontaneously engaged in the open position.
For safety devices which intervene when pressure increases and decreases, keep the lever raised and
increase the outlet pressure to the desired regulator set-point. At this point, the lever can be released and the
slam-shut will stay in the open position;
5) Put the three wais valve 12 in working position (connecting the pressure regulator with the pilot).
6) Partially open the bleed cock 6.
7) Completely increase the setting of the pilot 3 by tuning the adjustment screw 10 clockwise and ensure that the
service regulator 1 is in the fully open position by controlling the position of the stroke indicator through the
window.
8) Check that the setting of the pilot 10 corresponds to the selected working value for the monitor and adjust it
to the desired value if necessary.
9) Reduce the setting of the pilot 3 to the selected working value for the service regulator.
10) Check that the REFLUX 819/FO monitor is fully open by controlling the position of the stroke indicator throu-
gh the window.
11) Close the bleed cock 6 and check that the downstream pressure, after increasing, settles at a value slighth
higher than that of closure of the pilot/regulator assembly. If it does not, remedy the causes of the internal
leakage;
12) Using a foaming agent, check the tightness of all the joints between the on/off valves V1 and V2.
13) Very slowly open the downstream on/off valve V2 until the line is completely filled. If, at the beginning of this
operation, the pressure in the line is much lower than the set-point, the opening of this valve should be choked
so as not to exceed the maximum flow rate value of the installation.
14) It is recommended check that when you operate the slam-shut manually, the flow in the line stops.
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