Emerson CP200 Instruction Manual download pdf (Page 7)

CP200 Series

• Install the regulator with the vent pointed vertically down,

see Figure 4. If the vent cannot be installed in a vertically

down position, the regulator must be installed under a

separate protective cover. Installing the regulator with

the vent down allows condensation to drain, minimizes

the entry of water or other debris from entering the vent,

and minimizes vent blockage from freezing precipitation.

• Do not install the regulator in a location where there

can be excessive water accumulation or ice formation,

such as directly beneath a downspout, gutter, or roof

line of building. Even a protective hood may not provide

adequate protection in these instances.

• Install the Regulator so that any gas discharge through

the vent or vent assembly is over 3 feet / 0.91 m away

from any building opening.

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.

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 4.

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 CP200 Series regulators have a 1/4 NPT screened

vent opening in the spring case of the Type 67CP loading

regulator. If necessary to vent escaping gas away from the

regulator, install a remote vent line in the Type 67CP 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 token relief must be

large enough to vent all relief valve discharge to atmosphere

without excessive backpressure and resulting excessive

pressure in the regulator.

Periodically check all vent openings to be sure that they are

not plugged or obstructed.

Outlet pressure ranges are shown in Table 3. The maximum

emergency (casing) outlet pressure is 25 psig / 1.7 bar.

Token Relief

Types with a “T” in the type number, e.g., Type CP200IT

provide an optional small capacity or token relief located in

the Type 67CPR to relieve minor overpressure caused by

thermal expansion or minor nicks in the orice or disk.

Startup

CAUTION

Pressure gauges must always

be used to monitor downstream pressure

during startup. Procedures used in putting

this regulator into operation must be

planned accordingly if the downstream

system is pressurized by another regulator

or by a manual bypass.

If the downstream system is not pressurized by another

regulator or manual bypass valve, 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 pressure.

Adjustment

To increase the outlet pressure setting of the regulator, the

adjusting screw (key 18, Figure 8) of the loading pressure

regulator must be turned clockwise. This requires loosening

the locknut (key 19). To reduce the outlet pressure setting,

turn the adjusting screw counterclockwise. Retighten the

locknut. A pressure gauge should always be used to monitor

downstream pressure while adjustments are being made.

CAUTION

Do not remove the locknut or adjust the

spring to produce an outlet pressure setting

outside the indicated spring range.

Shutdown

Installation arrangements may vary, but in any installation

it is important that the valves be opened or closed slowly

and that the outlet pressure be vented before venting

inlet pressure to prevent damage caused by reverse

pressurization of the regulator. The steps below apply to the

typical installation as indicated.

1. Open valves downstream of the regulator.

2. Slowly close the upstream shut-off valve.

3. Release of downstream pressure should be automatic

as the regulator opens in response to the lowered

pressure on the diaphragm.

4. Close the outlet shut-off valve.

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CP200 Series 1

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Emerson CP200 Instruction Manual Page 7

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