TECHNICAL MANUAL MT103
36
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) Very slowly open the inlet on/off valve V1.
3) 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;
4) Partially open the bleed cock 6.
5) 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.
6) 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.
7) Reduce the setting of the pilot 3 to the selected working value for the service regulator.
8) Check that the REFLUX 819 monitor is fully open by controlling the position of the stroke indicator through
the window.
9) 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;
10) Using a foaming agent, check the tightness of all the joints between the on/off valves V1 and V2.
11) 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.
12) It is recommended check that when you operate the slam-shut manually, the flow in the line stops.
5.6
COMMISSIONING THE REGULATOR PLUS REFLUX 819/FO IN-LINE MONITOR WITH SB/82
SLAM-SHUT VALVE (FIG. 25)
If there is also a relief valve in the line, refer to par. 3.1 to check it.
Fig. 25
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