Startup; Adjustment - Fisher CS403 Instruction Manual

Downstream Control Line Installation with
Integral Monitor
Refer to Figure 6. When installing the Types CS403ET
and CS403EN regulators, connect downstream control
line tubing to the lower casing of the Primary Regulator
and run the tubing approximately 20 in. / 508 mm
downstream. Connect a second, separate downstream
control line tubing to the lower casing of the Integral
Monitor and run the tubing approximately 20 in. /
508 mm downstream. For best results, the outer
diameter of the control line tubing for both the Primary
Regulator and the Integral Monitor should be 3/8 in. /
9.5 mm or larger.
Downstream Control Line Installation
with Slam shut
Refer to Figure 7. When installing the Types CS404ET
and CS404EN regulators, connect downstream control
line tubing to the lower casing of the Regulator and run
the tubing approximately 20 in. / 508 mm downstream.
Connect a second, separate downstream control line
tubing to the lower casing of the slam shut and run the
tubing approximately 20 in. / 508 mm downstream.
For best results, the outer diameter of the control line
tubing for the regulator should be 3/8 in. / 9.5 mm or
larger. The outer diameter of the control line tubing for
the slam shut should be 1/4 in. / 6.4 mm or larger.
Installation with External Overpressure
Protection
If the regulator is used in conjunction with a Type 289H
relief valve, it should be installed as shown in Figure 5.
The outside end of the vent line should be protected with
a rainproof assembly. The Type 289H should be set
10 in. w.c. / 25 mbar higher than the outlet pressure
setting of the regulator, up to 30 in. w.c. / 75 mbar
outlet pressure. For pressure greater than this, set the
Type 289H 0.75 psi / 0.05 bar higher than the outlet
pressure setting of the regulator.
Vent Line Installation
The CS400 Series regulators have a 1 NPT
screened vent opening in the spring case. If
necessary to vent escaping gas away from the
regulator, install a remote vent line in the spring
case tapping. Vent piping should be as short and
direct as possible with a minimum number of bends
and elbows. The remote vent line should have the
largest practical diameter. Vent piping on regulators
with internal relief must be large enough to vent
all relief valve discharge to atmosphere without
excessive backpressure and resulting excessive
pressure in the regulator.
The Type CS403 offers an optional token relief. This
optional low capacity relief is located in the spring
case of the Primary Regulator. If necessary to vent
escaping gas away; install a remote vent line in the
spring case tapping of the Primarily Regulator as
described above.
Periodically check all vent openings to be sure that
they are not plugged.
CS400 Series Outlet pressure ranges are shown in
Table 5. Outlet pressure greater than 5 psi / 0.34 bar
above setpoint may damage internal parts such as
the diaphragm head and valve disk. The maximum
emergency (casing) outlet pressure is 25 psig /
1.7 bar.

Startup

Pressure gauges should always be
used to monitor downstream pressure
during Startup.
With the downstream system depressurized, use the
following procedure to startup the regulator:
1. Check to see that all appliances are turned off.
2. Slowly open the upstream shut-off valve.
3. Check inlet and outlet pressure for correct values.
4. Check all connections for leaks.
5. Turn on utilization equipment and recheck
the pressures.

Adjustment

For Types that include the Integral
Monitor module, refer to the instruction
manual for Type TM600 Integral Monitor
for Adjustment and Maintenance of the
Integral Monitor. For Types that include
the slam-shut module, refer to the
instruction manual for Type VSX4
slam shut for Adjustment and
Maintenance of the slam shut.
CS400 Series
CAUTION
Note
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