Emerson CS800 Instrukcja Obsługi Pobierz pdf (Strona 8)

CS800 Series

During normal operation the True Monitor™ is in a wide-

open state as its setpoint is set higher than the primary

regulator. See Tables 8 and 9 for guidance regarding the

setpoints of the regulator and associated Integral Monitor

sets. If the downstream pressure should rise to the setpoint

of the True Monitor due to loss of pressure control by the

primary regulator, the monitor will assume control and

regulate ow to the downstream system. If a Token relief is

present, the token relief will relieve a small amount of gas to

the atmosphere as an indication that the Integral Monitor is

controlling the downstream pressure.

Either internal or external downstream pressure registration

is available. External pressure registration requires a

downstream sensing line. See the Type TM600 Integral

True-Monitor Instruction Manual (D103126X012) for

additional details of operation.

Types CS804, CS824 and CS854

Slam-Shut Operation

The Type VSX8 Slam-shut module on the CS804 Series

regulators is a fast acting shutoff device that provides

overpressure (OPSO) or overpressure and underpressure

(OPSO/UPSO) protection by completely shutting off the ow

of gas to the downstream system. See Tables 10 and 11

for guidance regarding the typical setpoint of the regulator

and associated OPSO and UPSO sets. The Type VSX8’s

actions are independent of the CS804 Series regulator and

of variations to the inlet pressure. The Type VSX8 provides

the option of internal or external downstream pressure

registration. External registration requires a downstream

sensing line. See Figure 11 for guidance regarding

installation of the downstream control line.

The Type VSX8 shutoff disk is normally in the open (reset)

position, see Figure 5. If the downstream pressure below

the slam-shut diaphragm increases (or decreases) until

it reaches the slam-shut setpoint, this diaphragm moves

upward (or downward) to release the trip mechanism which

allows the spring force on the stem to push the disk against

the seat, shutting off all gas ow. To reset the slam-shut after

gas has been shutoff; refer to Type VSX8 Instruction Manual

(D103127X012) for additional details.

WARNING

In order for the Underpressure Shutoff

(UPSO) of any slam-shut to be triggered,

the downstream pipe pressure must drop

below the UPSO setpoint. In the case of a

downstream line break, numerous factors

can prevent the downstream pipe pressure

from decreasing below the slam-shut UPSO

setpoint. 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.

Table 11. Regulator and Slam-Shut Underpressure Shutoff (UPSO) Pressure and Overpressure Shutoff (OPSO) Ranges

REGULATOR

SLAM-SHUT DEVICE

Under Pressure Shut-off (UPSO) Over Pressure Shut-off (OPSO)

TYPE

FACTORY

SETPOINT

SPRING

RANGE

FACTORY

SETPOINT

(1)

SPRING RANGE

SPRING PART

NUMBER AND

COLOR

FACTORY

SETPOINT

(2)

SPRING RANGE

OVER UPSO

SETPOINT

(3)

SPRING PART

NUMBER AND

COLOR

In. w.c. mbar In. w.c. mbar In. w.c. mbar In. w.c. mbar In. w.c. mbar In. w.c. mbar

CS804

7 17 5.5 to 8.5

14 to

3 7

2 to 12 5 to 30

T14168T0012 /

White

22 55

17 to 28 42 to 69

GF02168X012 /

Brown

11 27 8 to 12

20 to

6 15 25 62

14 35 10 to 16

25 to

9 22 30 75

1 psig 69 14 to 30

35 to

0.5 psig 35

0.36 to

2.3 psig

25 to

160

T14170T0012 /

Silver

2 psig 138

1.3 to

3.1 psig

90 to

214

GF02170X012 /

Orange

CS824

2 psig 138

1 to

2.5 psig

69 to

170

1 psig 69

0.36 to

2.3 psig

25 to

160

T14170T0012 /

Silver

3.5 psig 241

1.3 to

3.1 psig

90 to

214

GF02170X012 /

Orange

3 psig 207

1.5 to

3.5 psig

100 to

241

1.75 psig 121

1.5 to

7.3 psig

100 to

500

FA142869X12 /

Orange Stripe

5 psig 345

2.7 to

5.5 psig

186 to

379

GF02171X012 /

Pink

5 psig 345

2.5 to

5.5 psig

170 to

380

3 psig 207 7 psig 483

CS854 7 psig 483

5 to

10 psig

345 to

690

3.5 psig 241

1.5 to

7.3 psig

100 to

500

FA142869X12 /

Orange Stripe

9 psig 621

2.7 to

5.5 psig

186 to

379

GF02171X012 /

Pink

1. If Non-Factory UPSO setpoints are specied, a minimum differential of 4 in. w.c. / 10 mbar between UPSO setpoint and regulator setpoint must be maintained in order to ensure a

secure latch of the Slam-Shut.

2. For units equipped with Token Relief, if Non-Factory Slam-shut OPSO setpoints are specied, they must be higher than the Token Relief Start-to-Discharge values provided in Table 6.

3. If Non-Factory OPSO setpoints are specied, the allowable OPSO setpoint cannot exceed the maximum of 3 psig / 207 mbar above the regulator setpoint in order to ensure no internal

parts damage from overpressure.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 31 32

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