Emerson CS800 Manual de instrucciones descargar pdf (Pagina 16)

CS800 Series

3. Inlet pressure should be released automatically

downstream as the regulator opens in response to the

lowered pressure on the diaphragm.

4. Close outlet shut-off valve.

Maintenance and Inspection

WARNING

To avoid personal injury or equipment

damage, do not attempt any maintenance

or disassembly without rst isolating

the regulator from system pressure and

relieving all internal pressure as described

in “Shutdown” section.

Test the regulator that has been

disassembled for repair to ensure

that it is operating properly before

being returned to service. Only parts

manufactured by Emerson™ should be used

for repairing Fisher

regulators. Restart gas

utilization equipment according to normal

Startup procedures.

Due to normal wear or damage that may

occur from external sources, inspect and

maintain this regulator periodically. The

frequency of inspection and replacement of

parts depends upon the severity of service

conditions or the requirement of local, state

and federal rules and regulations.

Perform periodic inspection on Wide-Open

Monitor regulators, Integral True-Monitor™ or

Slam-shut overpressure protection modules

to ensure protection of the downstream

system in the event of a failure to the primary

regulator. This inspection must test that the

wide open monitor, Integral True-Monitor or

Slam-shut functions as intended.

Maintenance on CS800 Series with

Secondary Seat™ Protection

Types CS805 and CS825 regulators do not have any means

to alert when the Secondary Seat operates at lockup. A lock-up

test can be done on the regulator to determine if the lock-up

pressure has elevated to or near the values in Table 7, under the

heading Types CS805 and CS825. If so, replace the regulator

primary disk and orice.

Internal relief operation on units equipped with Secondary Seat

Protection is an indication that the Secondary Seat Protection on

the Types CS805IR and CS805IQ may not be working and that

the Types CS806IR and CS806IQ Secondary Seat may have

closed. Maintenance should address any potential causes for

internal relief operation as well as other regulator malfunctions

separate from the Secondary Seat.

CAUTION

When applying pressure to the regulator

spring case through the vent, care must

be taken not to exceed 3 psig / 0.21 bar,

which is the maximum differential across

the diaphragm.

Types CS804, CS824 and CS854 with

Slam-shut Module

When adjusting the Primary Regulator and Slam-shut for

operation, reference Tables 10 and 11 and the footnotes in

each table for the OPSO and OPSO/UPSO setpoints of the

slam-shut for the given regulator spring ranges.

CAUTION

Equipment installed downstream the

Type VSX8 slam shut device can be damaged

if the following procedure for resetting the

Type VSX8 slam shut device is not followed.

This equipment includes the integral

Type VSX8 or regulator congurations.

1. To properly reset the Type VSX8 Slam-shut after it has

been tripped to the closed position, insert a at-head

screwdriver into the position shown in Figure 8 on

the backside of the reset button (refer to Type VSX8

Instruction Manual, key 30, Figure 8).

2. Slowly rotate the screwdriver to gradually pull the reset

button (refer to Type VSX8 Instruction Manual, key 30)

away from the Type VSX8 device. This slow movement

allows for a slow bleed of the pressure across the

Type VSX8 Slam-shut’s disk and seat area. The operator

should be able to hear the pressure bleeding through

the system.

3. When the pressure has equalized and the air bleeding

sound has dissipated, completely pull the reset button

(refer to Type VSX8 Instruction Manual, key 30) away

from the Type VSX8 Slam-shut device by hand until the

internal shut-off mechanism has been re-latched.

4. Once the operator feels the click of the re-latch occurring,

completely push the reset button (refer to Type VSX8

Instruction Manual, key 30) back into its original position.

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.

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Emerson CS800 Manual de instrucciones Pagina 16

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