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To prevent negative turbulence, perform all downstream piping diameter variations progressively.
Avoid locating control line piping near direct sunlight or heat sources. You must connect the
regulator's control line to the downstream pipe. Insert control line connections in a straight section
of the downstream piping (see the installation schematics).
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To prevent impurities and condensation from collecting and obstructing gas passage, Itron
recommends welding the control line connections on the upper gas line piping.
Important Control line piping must slope slightly downwards to the pipe (see the installation
schematics.)
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To achieve the best performance from your regulator, the gas velocity at the pipe's control line
position must not exceed:
Low pressure <2.9 PSIG (50 to 65 ft/s)
Medium/high pressure >2.9 PSIG (65 to 130 ft/s)
After RB regulator installation, verify:
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The upstream and downstream on/off valves and the discharge vent pipe are closed.
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The inlet gas pressure does not exceed the established design value.
To start up the RB4000 or RB1700 regulator
1. Partially open the upstream on/off valve slowly to begin a very small gas flow.
2. Setting the shutoff valve for minimum pressure intervention causes the valve to close in the
absence of pressure. Reset the shutoff valve if it was set for minimum pressure intervention.
3. Verify the pressure rises slowly on the upstream and downstream pressure gauges.
Important The downstream pressure must stabilize around the pre-set value or a slightly higher
value. If the pressure continues to rise, interrupt the starting procedure by closing the upstream
on/off valve. Consult the trouble-shooting diagram to identify the malfunction's cause.
4. After the upstream pressure value is stabilized, open the upstream on/off valve completely.
5. Slowly open the downstream on/off valve until the piping is completely filled.
The pressure regulator is operative after you complete the start up procedure. Follow the start up
procedure when you install monitor-equipped regulators on the line with the active regulator (see the
installation schematic).
Important A pressure gauge installed in the pipe section between two regulators must
indicate the same pressure value as the upstream gauge.
Regulator Settings
The regulator is typically delivered set to the order specifications. If the set pressure must be modified, set
the value within the installed spring's setting range.
Note Verify the installed spring can achieve the desired set pressure value.
To modify regulator settings
1. To increase the set pressure value, slowly rotate the spring adjustment ferrule (lock) nut clockwise
using the adjustment wrench until the setting reaches the desired range (monitor the settings on
the downstream gauge).
2
TDC-0992-001 RB4000 and RB1700 Regulator Installation Instructions
Proprietary and Confidential
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