Emerson CP400 Instruction Manual download pdf (Page 11)

CP400 Series

Regulators Subjected to Heavy

Snow Conditions

Some installations, such as in areas with heavy

snowfall, may require a hood or enclosure to protect

the regulator from snow load and vent freeze over.

Downstream Control Line Installation

A CP400 Series regulator with an EN or ET in the type

number has a blocked throat, an O-ring stem seal and

a 3/4 NPT control line tapping in the lower diaphragm

casing. A regulator with a downstream control line is

used for monitoring installations or other applications

where there is other equipment installed between the

regulator and the pressure control point.

For CP400 Series regulator with an EN or ET in the

type number, connect downstream control line tubing

to the lower casing, and run the tubing approximately

20 inches / 0.5 m downstream. For best results,

the outer diameter of the control line tubing should be

3/8 inch / 9.5 mm or larger.

Downstream Control Line Installation

with Integral Monitor

Refer to Figure 6. When installing the Types CP403ET

and CP403EN regulators, connect downstream

control line tubing to the lower casing of the Primary

Regulator, and run the tubing approximately

20 inches / 0.5 m downstream. Connect a second,

separate downstream control line tubing to the lower

casing of the Integral Monitor, and run the tubing

approximately 20 inches / 0.5 m 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 inch / 9.5 mm or larger.

Downstream Control Line Installation

with Slam shut

Refer to Figure 7. When installing the Types CP404ET

and CP404EN regulators, connect downstream

control line tubing to the lower casing of the Regulator,

and run the tubing approximately 20 inches / 0.5 m

downstream. Connect a second, separate downstream

control line tubing to the lower casing of the slam shut,

and run the tubing approximately 20 inches / 0.5 m

downstream. For best results, the outer diameter of

the control line tubing for the Regulator should be

3/8 inch / 9.5 mm or larger. The outer diameter of

the control line tubing for the slam shut should be

1/4 inch / 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 is typically

set 10 inches w.c. / 25 mbar higher than the outlet

pressure setting of the regulator, up to 30 inches 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 CP400 Series regulators have a 1/4 NPT screened

vent opening in the spring case of the loading pressure

regulator 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.

For Types with optional Token relief, this optional

low capacity relief is located in the spring case of the

Type 67CPR Loading Pressure Regulator. If necessary

to vent escaping gas away, install a remote vent line

in the spring case tapping of the Type 67CPR Loading

Pressure Regulator as described above.

Periodically check all vent openings to be sure that

they are not plugged.

CP400 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

CAUTION

Pressure gauges should always be

used to monitor downstream pressure

during Startup.

Note

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 the types that

include the slam-shut module, refer to the

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CP400 Series 1

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Emerson CP400 Instruction Manual Page 11

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