Technical manual
MT 208-E
13
system. On the contrary erase the causes generating the
internal leak.
12) Using a foam substance, 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
to obtain the
complete filling of the pipe.
14) If at the beginning of this operation the pressure in the pipe is
much lower than the set point, the opening of this valve should
be choked so as not to go beyond the maximum flow rate value
for the installation.
15) If pumping phenomena arise in normal working conditions, it is
necessary to repeat the operations in point
9
so as to readjust
the setting, increasing the opening of the AR100 valve. If on the
other hand, there is an excessive reduction of the regulated
pressure with an increase in flow, repeat the above operations
with a smaller opening of the AR100 valve.
5.5
COMMISSIONING THE REGULATOR
APERFLUX 101 WITH REFLUX 819 IN
LINE MONITOR WITH INCORP. SB/82
SLUM-SHUT AND ACCELLERATING
VALVE (fig.21)
Is there also a relief valve in the line, refer to par. 3.1 to check it.
Check and adjust the intervention of the
slam-shut 7 as follows:
A)
For slam-shuts connected to the downstream piping by a three-
way deviator push valve
11
, proceed as follows (fig. 22):
-
connect a controlled auxiliary pressure to
C
-
stabilise this pressure at the set-point established for the
regulator
-
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:
• Safety devices which intervene 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.
• Safety devices which intervene 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. 23) 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 test should be repeated at least every 6 monts.
On completion of the slam-shut tests, proceed as follows:
1)
Ensure that the slam-shut is in the closed position.
2)
Open the inlet on-off valve V1 very slowly.
3) Completely increase the setting of the pilot
3
by turning the
screw
10
clockwise (fig. 24).
4) Close the AR100
2
valve in position
1
.
5) Completely increase the setting of the accelerating valve
12
by
turning the adjustment screw (fig. 13) clockwise.
6) Open the slam-shut very slowly, turning the provided lever
clockwise.
7) Partially open the discharge cock
6
8)
Adjust the setting of the pilot of the monitor
10
to the intervention
value set for the accelerating valve
12
(see table 6).
9) Lower the setting of the accelerating valve until, using a foam,
gas is seen to come out from the discharge point.
10) Lower the setting of the pilot
10
to the selected working value of
the monitor, ensuring that the valve
12
is no longer discharging
gas.
11) Adjust the setting of the pilot of monitor
10
to the set value.
12) Open the AR100
2
valve in position
8
.
13) Reduce the setting of pilot
3
to the selected working value of the
service regulator.
14) Ascertain that the REFLUX 819 monitor positions itself
completely open, controlling the position of the stroke indicator.
15) Adjust the setting by alternately adjusting the regulating AR100
valve and the 30./... pilot so that the value of the set pressure is
obtained with the minimum opening possible of the AR100 valve;
then block the screw 10 of the pilot with the provided nut
9
(fig.
24).
16) Close the vent cock
6
and check that the downstream pressure,
after a period of increase, stabilizes and at a value
slightly higher
than that of closure of the pilot/regulator combination. Otherwise
eliminate the causes of the internal leakage.
17) Using a foam substance, check the tightness of all the joints
between the on-off valves V1 and V2.
18) Very slowly open the downstream on off valve V2 to obtain the
complete filling of the pipe. If at the beginning of this operation
the pressure in the pipe is much lower than the set point, the
opening of this valve should be choked so as not to go beyond
the maximum flow rate value for the installation.
fig. 21
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