DRESSER RB 1700 Instalación Y Puesta En Marcha página 6

Installation
• Check that the maximum inlet pressure is
not higher than the maximum allowable
pressure of the product
• Arrange enough room for the serving of
the regulator and/or the safety slam-shut
valve
Before installing the product in the piping,
the following must be checked:
• the upstream piping must be cleaned from
all impurities (sand, welding slag, etc )
• the product must not be visibly damaged
• the inlet and outlet chambers of the
product must be perfectly clean
Make sure that the direction of gas flow
corresponds to the arrow on the valve body
The regulator must be fitted without undue
stress on the valve body Following torques
should not be exceeded:
Sensing line
RB 1700 / RB 1800 / RB 1800F regulator
Thread size / "
3
4
Max torque 80 Nm
Bolts M12
Max torque 35 Nm
require external sensing lines for regulator
and safety valve
2
valve on the safety shutoff valve sensing line
is not permitted.
Fig 1 gives a typical example of installation
with exception of RB 1700 - size
1
with exception of RB 1700
2
6
1" 1" /
1
2
110 Nm 140 Nm
M14 M16
55 Nm 85 Nm
controllers An isolating
/ "
3
4
Regulator Start-up
Before start-up, the installation must be
checked for leaks.
To start-up the regulator properly, proceed
as follows:
• check that the upstream and downstream
on/off valves and the vent valve are all
closed
• partially open the upstream on/off valve
slowly enough to pass a very small amount
of gas;
• reset the safety shutoff valve -
See § Relatching the SSV"
Note that a safety shutoff valve with over-
and under-pressure protection is always
closed in absence of gas downstream of
the regulator.
• check that the pressure rises slowly; the
downstream pressure must stabilize around
the set value If the pressure continues
to rise, interrupt the start-up procedure
by closing the upstream on/off valve and
identify the cause of the malfunction;
• after the outlet pressure has stabilized,
open the on/off valve completely;
• then slowly open the downstream on/off
valve until the piping is completely filled
At this point, the pressure regulator is
operative
1