Emerson CP400 Instruction Manual download pdf (Page 12)

CP400 Series

instruction manual for Type VSX4 Slam

shut for adjustment and maintenance of

the slam shut.

The range of allowable pressure settings

for the primary regulator is stamped on

the nameplate. If the required setting is not

within this range, substitute the correct

spring (as shown in Table 5). If the spring

is changed, change the nameplate to

indicate the new pressure range.

A pressure gauge should always be used

to monitor downstream pressure while

adjustments are being made.

Adjustment

To increase the outlet pressure setting of the

regulator, the adjusting screw of the loading regulator

(key 18, Figure 15) 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 range of 1 to 20 psig /

69 mbar to 1.4 bar.

CP400 Series with Integral Monitor

When adjusting the primary regulator and Integral

Monitor for operation, ensure that the pressure

differences between the primary regulator and the

Integral Monitor shown in Tables 7 and 8 are observed.

For example, if the primary regulator setpoint is set

at 8 inches w.c. / 20 mbar, then the Integral Monitor

should be set at a minimum of 14 inches w.c. /

35 mbar or higher.

To test the Integral Monitor operation, the primary

regulator setpoint must be adjusted above the Integral

Monitor’s setpoint to simulate a failure of the primary

regulator. If the spring range of the primary regulator

is sufciently high, it can simply be adjusted above the

Integral Monitor’s setpoint by following the adjustment

procedure for the primary regulator. Otherwise, a

different spring with a setpoint higher than the Integral

Monitor’s setpoint must be installed to check the

operation of the Integral Monitor.

CP400 Series with Slam shut

When adjusting the primary regulator and slam shut

for operation, refer to Table 9 for the OPSO setpoints

and Table 10 of OPSO and UPSO setpoints of the

slam shut for the given regulator spring ranges.

WARNING

In the case of a downstream line break,

numerous factors affect the capability to

evacuate gas from the pipeline. These

factors include the distance of pipe

to the break, the diameter of the pipe,

size of the break and the number of

restrictions, such as valves, elbows and

bends, downstream of the regulator and/

or slam-shut device. Due to these factors

additional protections should be installed

to stop ow in the event of a line break.

CAUTION

Equipment installed downstream the

Type VSX slam-shut device can be

damaged if the following procedure for

resetting the Type VSX slam-shut device is

not followed. This equipment includes the

integral Type VSX/regulator congurations.

Step 1:

• To properly reset the Type VSX slam shut after

it has been tripped to the closed position, a at-

head screwdriver must be inserted into the position

shown in Figure 8 on the backside of the reset

button (key 30, Figure 8).

Step 2:

• The screwdriver should be slowly rotated to gradually

pull the reset button (key 30) away from the Type VSX

device. This slow movement allows for a slow bleed

of the pressure across the Type VSX slam-shut’s disk

and seat area. The operator should be able to hear the

pressure bleeding through the system.

Step 3:

• When the pressure has equalized and the air

bleeding sound has dissipated, the reset button

(key 30) should be pulled completely away from

the Type VSX slam-shut device by hand until the

internal shut-off mechanism has been re-latched.

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CP400 Series 1

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Emerson CP400 Instruction Manual Page 12

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