Installation - ITRON RB 4000 Instruction Manual

Installation

• Check that the maximum inlet pressu-
re is not higher than the design pressu-
re of the regulator.
• Regulator should be lifted only with
belts around the body.
• Arrange enough room for the serving
of the regulator.
Before installing the pressure regulator in
the piping, the following must be chec-
ked:
• the upstream and downstream flanges
must be parallel so as to install the re-
gulator without undue stress.
• the upstream piping must be cleaned
from all impurities (sand, welding slag,
etc.)
• the pressure regulator must not be vi-
sibly damaged.
• the inlet and outlet chambers of the
pressure regulator must be perfectly
clean.
Make sure that the direction of gas flow
corresponds to the arrow on the pressure
regulator body.
When tightening the flange bolts, the fol-
lowing maximum torque - applicable to
Class 5.6 bolts - should not be exceeded:
M12 M14
35 Nm 55 Nm
For ease of operation, we recommend
performing installation with the valve
body in horizontal alignment, with
actuator upwards. Installation with
M16 M20
85 Nm 1 70 Nm
actuator downwards or vertical installation
are also possible.
Fig 4 gives a typical example of installa-
tion:
• The downstream vent valve eases
start-up and changes in pressure set-
ting
• The creep relief valve - optional -limits
pressure surges (example: gas thermal
expansion in case of downstream pi-
ping exposed to sun radiation at zero
flow).
Outlet buffer volume
In case of fast variations of gas demand
(ON/OFF), the response time of the
regulator may cause transient pressure
surges or drops that may trigger the
overpressure or under-pressure
protection devices. These pressure
changes can be limited to acceptable
values by providing for a downstream
piping volume greater than 1 dm
m /h of flowrate variation.
3
Sensing line
The sensing line must be connected to a
section reasonably free from turbulences,
preferably in a straight section of the
downstream piping as shown in Fig 3.
Outlet pipe dimensions shall be such that
the gas velocity at pressure sensing tap
does not exceed those given below:
• Outlet pressure < 200 mbar
• Outlet pressure > 200 mbar
per
3
15 to 20 m/s
20 to 40 m/s
7
11