Technical manual
MT 208-E
12
5.2
GAS INPUT, CONTROL OF EXTERNAL
TIGHTNESS AND SETTING
The pressurization of the equipment shall be performed very slowly.
Should not any stabilization procedure be carried out, it is
recommended to keep gas speed in the feeding piping at a value equal
to 5 m/sec during pressurization.
To protect the apparatus from damage, the following operations must
never be carried out:
Pressurization through a valve located downstream from the
apparatus itself.
Depressurization through a valve located upstream from the
apparatus itself.
External tightness is guaranteed if no bubbles form when a foam
medium is applied on the element under pressure.
The regulator and any other apparatuses (slam-shut, monitor) are
normally supplied already set for the desired set-point. It is possible for
various reasons (e.g., vibration during transport) for the settings to be
changed while remaining within the values permitted by the springs
used.
We therefore recommend checking the settings using the procedures
illustrated below.
Table 6 gives the recommended set-point for the apparatuses in the
various installation arrangements. The figures in these tables can be
useful both when checking existing set-point and for modifying them
should this become necessary later.
In installation consisting of two lines, we suggest commissioning one
line at a time, starting from the one with the lover set-point, known as
the “reserve” line. The set-point of the apparatuses in the line will
obviously deviate from those specified in the table 6.
Before commissioning the regulator you must check that all the on/off
valves (inlet, outlet, any by-pass) are closed and that the gas is at a
temperature which will not lead to malfunction.
5.3
COMMISSIONING THE REGULATOR
(fig.19)
If there is also a relief valve in the line, refer to par. 3.1 to check it.
1)
Partially open the atmosphere drain tap
6
.
2)
Open the AR100
2
valve in position
8
.
3)
Open the inlet on-off valve
V1
very slowly.
4)
By means of the pressure gauge
5
, check that the pressure
does not exceed the maximum value permitted by the setting
spring fitted in the pilot. If necessary suspend the operation by
closing
V1
and completely reduce the load of the spring by
turning screw
1
0 anticlockwise (fig. 24). Reopen valve
V1
slowly.
5)
Choke the AR100 valve.
6) Adjust the setting by alternately adjusting the 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
.
7) Close the bleed 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.
8)
Using a foam substance, check the tightness of all the joints
between the on-off valves
V1
and
V2
.
9)
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.
10) If pumping phenomena arise in normal working conditions, it is
necessary to repeat the operations in point
6
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.
5.4 COMMISSIONING THE REGULATOR
APERFLUX 101 WITH APERFLUX 101 IN
LINE MONITOR (fig.20)
1)
Partially open the atmosphere drain tap
6
.
2)
Open the AR100
9
valve of the monitor in position
8
.
3)
Close the AR100
2
valve of the service regulator in position 1.
4)
Open the inlet on-off valve
V1
very slowly.
5)
Completely increase the setting of the pilot
3
.
6)
Check, via pressure gauge
5
, that downstream pressure gets
stabilized at the envisaged monitor setting value. Adjust it acting
alternatively on regulation bolt of the pilot
10
and on regulation
valve AR100
9
,
so that the setting pressure is the pressure
reached with the minimal opening possible of the valve AR100.
7)
Open valve AR100
2
of the main regulator in position
8
.
8)
Slowly decrease the setting of the pilot
3
until the chosen value
for the functioning regulator is reached.
9)
Repeat the operations in point
6
for the pilot
3
and the valve
2
.
10) Wait until the downstream pressure settles at the envisaged
value and adjust it as descrbed in point
6
.
11) Close the atmosphere drain tap
6
and check that downstream
pressure, after an increase - stage, gets stabilized at a value
slightly higher than the closure value of the pilot / monitor
fig. 20
fig. 19
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