Shutdown; Maintenance - Emerson Fisher LS200 Series Instruction Manual

LS200 Series
KEY PART NUMBER
15 ERAA51785A0
31 ERAA07626A0
54 ERAA12336A0
34 ERAA12017A0
21 ERAA07751A0
58 M0236660X12
17 M5009027X12
22 ERAA12023A0
KEY PART NUMBER
202 GE38176X012
202 GE38176X012
228 M5011006X12
224 M5011019X12
216 ERAA49756A0
range for that particular spring. If the
desired control pressure is not within
the range of the spring, install a spring
of the proper range according to the
Diaphragm and Spring Case Area
section of the maintenance procedure.
To increase the pressure setting, remove the closing
cap (key 6, Figures 5, 6 and 7) and turn the adjusting
screw (key 10) clockwise; to lower the setting, turn the
adjusting screw counterclockwise.
A pressure gauge should always be used when
adjustments are being made. Do not adjust the spring
to produce an outlet pressure setting above the limit
stamped on the nameplate, located on the casing. If
the required pressure setting is not within the range of
the spring in use, substitute with the correct spring or
a different actuator might be needed, refer to Table 4
for spring ranges and actuator sizes. When changing
the spring, also change the nameplate, located on the
casing flange, to indicate the outlet pressure range.

Shutdown

Isolate the regulator from the pressure system and
release pressure from the outlet and the control line.
Inlet pressure will then automatically be released as
the regulator opens up in response to the lowered
pressure on the diaphragm. If the unit or station
has a slam-shut, ensure the slam-shut has not
isolated pressure upstream or downstream before
beginning maintenance.
10
Table 9. Torque Requirement for Regulator Maintenance
DESCRIPTION
Hex locknut
Hex
Hex locknut/Nylon
Torx screw - Orifice, Cage and Int Flange
Travel Indicator
Hex
255 and 350 mm actuator - Hex cap screw
Hex cap screw
Table 10. Torque Requirement for Slam-Shut Maintenance
DESCRIPTION
Hex cap screw
Hex cap screw
Hex socket cap screw
Hex cap screw
Hex socket set screw
SIZE
20 mm / 3/4 in. Socket
30 mm / 1-1/4 in. Wrench
20 mm / 3/4 in. Socket
T20 Torx
21 mm / 13/16 in. Socket
3/4 NPT
17 mm / 11/16 in Socket
13 mm / 1/2 in. Socket
SIZE
10 mm / 13/32 in. Socket
10 mm / 13/32 in. Socket
4 mm / 5/32 in. Hex Key
5 mm / 3/16 in. Hex Key
2.5 mm Hex Key

Maintenance

This section includes instructions for disassembly
and replacement of parts. All key numbers refer to
Figures 5, 6 and 7, except where indicated. Reference
Torque Values Table 9 for specific values of each
key number.
▲
WARNING
To avoid personal injury, property
damage or equipment damage caused by
sudden release of pressure or explosion
of accumulated gas, do not attempt any
maintenance or disassembly without
first isolating the regulator from system
pressure and relieving all internal
pressure from the regulator.
Regulators that have been disassembled
for repair must be tested for proper
operation 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.
To avoid personal injury due to the
sudden uncontrolled movement of
parts, do not loosen the diaphragm
casing cap screws (key 17 and 19) when
the control spring (key 13) has spring
TORQUE
Ft-lb N∙m
26 35
23 30
26 39
3 3.2
15 20
14 18
18 24
17 22
TORQUE
Ft-lb N∙m
12 15
6 8
5 6
8 10
3 3