Fisher Instruction Manual: FLA Series Pressure Reducing Regulators (Asia Pacific Only) | Fisher Manuals & Guides
Asia Pacific Only
D103150X012
FLA Series
Instruction Manual
Form 5857
March 2012
TM
FLA Series Pressure Reducing Regulators
E0820
Figure 1. Type FLA Regulator
Introduction
Scope of the Manual
This manual provides instructions for installation,
adjustment, maintenance, and parts ordering for
the FLA Series regulators, its pilots, booster valves,
and lter.
Description
The FLA Series regulators are accurate pilot-operated,
pressure balanced, soft seated regulators designed for
Natural Gas high pressure transmission/city gate, large
capacity distribution systems and power plant feeds.
The FLA Series provides smooth, quiet operation, tight
shutoff and long life. The regulator utilizes a main valve
actuator, a PRX or PS Series pressure reducing pilot,
and/or a Type SA/2 pilot supply pressure regulator.
Principle of Operation
Single Pilot Regulator
The pilot-operated Type FLA (Figure 2) uses inlet
pressure as the operating medium, which is reduced
through pilot operation to load the actuator diaphragm.
Outlet or downstream pressure opposes loading
pressure in the actuator and also opposes the pilot
control spring.
When outlet pressure drops below the setting of
the pilot control spring, pilot control spring force
on the pilot diaphragm opens the pilot valve plug,
providing additional loading pressure to the actuator
diaphragm. This diaphragm loading pressure opens
the main valve plug, supplying the required ow to the
downstream system. Any excess loading pressure on
the actuator diaphragm escapes downstream through
the exhaust restriction in the pilot.
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FLA Series
Specications
The Specications section gives some general specications for the FLA Series regulators. The nameplates
give detailed information for a particular regulator as it comes from the factory.
Available Congurations
Type FLA: Pilot-operated pressure reducing regu-
lator for medium to high outlet pressures
Body Sizes
Type FLA:
DN 25, 40, 50, 80, 100, and 150 / NPS 1, 1-1/2, 2,
3, 4, and 6
Type FLA with Type SRS Silencer
(inlet x outlet):
DN 25 x 100, 40 x 150, 50 x 150, 80 x 250,
100 x 250, and 150 x 300 / NPS 1 x 4, 1-1/2 x 6,
2 x 6, 3 x 10, 4 x 10, and 6 x 12
Main Valve End Connection Style and
Pressure Ratings
ASME CL300 RF: 51.0 bar / 740 psig
ASME CL600 RF: 100 bar / 1450 psig
Maximum Inlet and Outlet (Casing) Pressure
(1)
(3)
(3)
(1)
100 bar / 1450 psig
Minimum Operating Differential Pressure
(2)
0.50 bar d / 7.3 psid
Outlet Pressure Ranges
See Table 1
Construction Materials
Covers and Flanges: Steel, ASTM A105
Sleeve: Steel, FE510 UNI 7729
Seat: Stainless Steel, 30CR UNI 6901-71
(AISI 420-B)
Diaphragm Plates: Steel
Diaphragm: Nitrile (NBR) Rubber with
PVC coating
Seal: Nitrile (NBR) Rubber or Fluorocarbon (FKM)
Seal Pad: Nitrile (NBR) Rubber
Pressure Registration
External
Temperature Capabilities
Working: -10 to 60°C / 14 to 140°F
Ambient: -20 to 80°C / -4 to 176°F
Options
Booster Valve
Pneumatic Device
Electric Remote Drive Unit
1. The pressure/temperature limits in this Instructional Manual and any applicable standard or code limitation should not be exceeded.
2. When using a Type SA/2 pilot supply lter regulator, the differential pressure across the regulator must be at least 3.10 bar d / 45 psid for optimum regulator performance.
3. At average ambient temperature.
When the gas demand in the downstream system
has been satised, the outlet pressure increases.
The increased pressure is transmitted through the
downstream control line and acts on the pilot diaphragm.
This pressure exceeds the pilot spring setting and
moves the diaphragm, closing the orice. The loading
pressure acting on the main diaphragm bleeds to the
downstream system through the exhaust restriction in
the pilot.
sensing the downstream and control pressure, goes
into operation to maintain the downstream pressure
at a slightly higher than normal pressure. During an
overpressure situation, monitoring keeps the uid
gas in line. Also, testing is relatively easy and safe.
To perform a periodic test on a monitoring regulator,
increase the outlet set pressure of the working
regulator and watch the outlet pressure to determine if
the monitoring regulator takes over at the appropriate
outlet pressure.
Monitoring Systems
Monitoring regulation is overpressure protection by
containment; therefore, there is no relief valve to
continuously vent gas to the atmosphere. When
the working regulator fails to control the pressure, a
monitor regulator installed in series, which has been
Wide-Open Monitoring Systems (Figure 3)
There are two types of wide-open monitoring
systems: upstream and downstream. The difference
between upstream and downstream monitoring is
that the functions of the regulators are reversed.
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FLA Series
E0827
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
PILOT SUPPLY PRESSURE
ATMOSPHERIC PRESSURE
TYPE SA/2
TYPE PRX:
S - BLEED PORT
B - SUPPLY PORT
L - LOADING PORT
A - SENSING PORT
V
R
M
TYPE FLA
TYPE SA/2:
V - SENSING PORT
R - PILOT SUPPLY PORT
M - INLET PORT
S
L
B
TYPE PRX
A
Figure 2. Type FLA Single Pilot Operational Schematic
Systems can be changed from upstream to
downstream monitoring, and vice-versa, by simply
reversing the setpoints of the two regulators. The
decision to use either an upstream or downstream
monitoring system is largely a matter of personal
preference or company policy.
In normal operation of a wide-open conguration,
the working regulator controls the system’s outlet
pressure. With a higher outlet pressure setting,
the monitor regulator senses a pressure lower than
its setpoint and tries to increase outlet pressure by
going wide-open. If the working regulator fails, the
monitoring regulator assumes control and holds the
outlet pressure at its outlet pressure setting.
Working Monitoring Regulators (Figure 3)
In a working monitoring system, the upstream
regulator requires two pilots and it is always the
monitoring regulator. The additional pilot permits
the monitoring regulator to act as a series regulator
to control an intermediate pressure during normal
operation. In this way, both units are always
operating and can be easily checked for
proper operation.
In normal operation, the working regulator controls
the outlet pressure of the system. The monitoring
regulator’s working pilot controls the intermediate
pressure and the monitoring pilot senses the system’s
outlet pressure. If the working regulator fails, the
monitoring pilot will sense the increase in outlet
pressure and take control.
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FLA Series
!
Table 1. Pilot Types and Outlet Pressure Ranges
USAGE
PILOT TYPES
Regulator Monitor
(2)
PS/79
(2)
PS/80
(3)
PRX/120
PRX-AP/120
1. FLA Series regulators are equipped with the PS or PRX Series pilots.
2. All PS Series pilots are supplied with a lter (5 micron ltering degree) and built-in pressure stabilizer, with the exception of Types PSO/79 and PSO/80.
3. Type SA/2 pressure pre-reducer must be used with PRX Series pilots.
(3)
PSO/79 REO/79 100 / 1450 0.50 to 40.0 / 7 to 580
PSO/80 REO/80 100 / 1450 1.5 to 40.0 / 22 to 580
PRX/120 PRX/125 100 / 1450 1.0 to 40.0 / 15 to 580
PRX-AP/120 PRX-AP/125 100 / 1450 30.0 to 80.0 / 435 to 1160
Note
ALLOWABLE PRESSURE,
bar / psig
Installation and Startup
The working regulator must be
rated for the maximum allowable
(1)
SET PRESSURE RANGE,
bar / psig
WARNING
operating pressure of the system
because this will be its inlet pressure
if the monitoring regulator fails.
Also, the outlet pressure rating of
the monitoring pilot, and any other
components that are exposed to the
intermediate pressure must be rated
for full inlet pressure.
Personal injury or equipment damage,
due to bursting of pressure-containing
parts may result if this regulator is
overpressured or is installed where
service conditions could exceed the
limits given in the Specications
section and on the appropriate
nameplate, or where conditions exceed
any rating of the adjacent piping or
Adjustment
piping connections.
COVER AND
FLANGES
MATERIAL
Steel
The adjustment of the regulator is performed by
means of the pilot adjusting screw, which varies
the compression of the control spring. Adjustment
is performed while the regulator is in operation
with the aid of a test pressure gauge to monitor
downstream pressure. The shutoff valve downstream
of the regulator must not be completely closed;
it is necessary that a small quantity of gas ows
downstream to allow the outlet side to vent down,
when it is necessary to lower the pressure.
Loosen the locknut and turn the adjusting screw slowly
to adjust outlet pressure. Use a pressure gauge to
check the outlet pressure until the desired pressure
is reached.
To avoid such injury or damage, provide
pressure-relieving or pressure- limiting
devices to prevent service conditions
from exceeding those limits. Also,
check that the installation is in
compliance with all applicable codes
and regulations.
Additionally, physical damage to the
regulator could break the pilot off the
main valve, causing personal injury
and property damage due to bursting
of pressure-containing parts. To avoid
such injury and damage, install the
regulator in a safe location.
Examine the unit on arrival to make sure no damage
has occurred in shipment. Clean and blow out
pipelines to be sure no welding slag or other foreign
material is present.
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TYPE PRX/120 OR
PRX/120-AP
FLA Series
TYPE SA/2
TARTARINI
OS/80X
L
A
S
4 x DN / NPS
TYPE PS/79
DN /
NPS
6 x DN / NPS
DN / NPS
4 x DN / NPS
B
R
TYPE SA/2
S
I
NG
LE
P
ILOT
SY
STEM
IN
B
A
TYPE PRX/120 OR
PRX/120-AP
L
S
STALLATIO
B
N
TYPE PRX/120 OR
L
S
A
PRX/120-AP
4 x DN / NPS
6 x DN / NPS
DN /
NPS
UPSTREAM OR DOWNSTREAM WIDE-OPEN MONITORING SYSTEM INSTALLATION
Figure 3. Typical Installation / Connection Schematics
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FLA Series
TYPE PS/79 TYPE PS/80
R
A A
R
n10
4 x DN / NPS
UPSTREAM OR DOWNSTREAM WIDE-OPEN MONITORING SYSTEM INSTALLATION (CONTINUED)
TYPE PRX/125 OR
PRX/125-AP
TYPE PRX/120 OR
PRX/120-AP
TYPE PRX/120 OR
PRX/120-AP
DN /
NPS
E0825
TYPE SA/2
TYPE SA/2
B
A
B
L
S
L
S
A
B
L
S
A
4 x DN / NPS
6 x DN / NPS
WORKING MONITORING SYSTEM INSTALLATION
Figure 3. Typical Installation / Connection Schematics (continued)
DN /
NPS
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FLA Series
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Single Pilot Regulator
Installation
A Type FLA regulator bleeds no gas to atmosphere
during normal operation, thus making the regulator
suitable for installation in pits and other enclosed
locations without elaborate venting system, if the
outlet pressure sensing lines are connected to
the downstream pipeline. This regulator also can
be installed in pits subject to ooding by venting
the pilot spring case above the expected ood
level so that the pilot setting can be referenced to
atmospheric pressure.
1. Use qualied personnel when installing,
maintaining, or operating this regulator. Inspect
the regulator and the pipeline to be certain both
are free of foreign materials.
2. Install the regulator so that the ow arrow cast
on the main valve matches the ow direction of
process uid through the regulator.
3. Apply pipe compound to the male pipeline
threads before installing a regulator with screwed
end connections. Use gaskets between pipeline
and regulator anges when installing a regulator
with anged end connections.
WARNING
and have a screened vent on its exhaust. Install
the regulator and any remote vent piping or tubing
so that the vent is protected from condensation,
freezing, or any substance that could clog it.
(The PS Series pilots have an internal relief valve
to protect the internal parts of the pilot in case
of overpressure.)
5. If Type PRX is used, connect a pilot supply line
from the upstream piping to the lower port of the
Type SA/2 lter/stabilizer regulator.
6. Connect a downstream control line to a straight
run of pipe 4 pipe diameters from the regulator
outlet as shown in Figure 3. If such a distance
is not practical, connect the control line away
from elbows, swages, nipples, or any area where
abnormal ow velocities occur.
7. Install a full ow hand valve, such as a full port
ball valve, in the control line.
8. Install the other end of the downstream control
line to the 1/2 NPT connection in the upstream
side of the case body.
9. Consult the appropriate instruction manual for
installation of an optional pneumatic or electric
remote control-drive unit. For optional remote
pneumatic loading of PRX and PS Series pilots,
make the spring case piping connections just as
they would be made for remote venting.
A regulator may vent some gas to
the atmosphere. In hazardous or
ammable gas service, vented gas
may accumulate, causing personal
injury, death, or property damage
due to bursting of pressure-retaining
parts. Vent a regulator in hazardous
gas service to a remote, safe location
away from air intakes or any hazardous
location. The vent line or stack opening
must be protected against condensation
or clogging.
4. The PRX and PS Series pilots have a 1/4 NPT
vent connection at the spring case and at the side
of the body respectively. To remotely vent the
pilots, remove the vent and install obstruction- free
tubing or piping into the 1/4 inch NPT vent
tapping. Provide protection on a remote vent by
installing a screened vent cap onto the remote end
of the vent pipe. The piping or tubing should vent
to a safe location, have as few elbows as possible,
Pre-startup Considerations
Each regulator is factory-set for the outlet pressure
specied on the order. If no setting was specied,
outlet pressure was factory-set at the mid-range of
the pilot control spring. Before beginning the startup
procedure in this section, make sure the following
conditions are in effect:
• Block valves isolate the regulator
• Vent valves are closed
• A bypass, if any, is in operation
In all cases, check the control spring setting to make
sure it is correct for the application.
CAUTION
Pilot supply pressure must be
introduced into the regulator before
introduction of any downstream
pressure, or internal damage may occur
due to reverse pressurization of the
pilot and main valve components.
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FLA Series
Pressure gauges should 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.
Note
Pilot supply pressure must be at least
1.03 bar / 15 psig greater than control
pressure to operate the regulator at
rated travel.
Although remote loading or control constructions
may require separate adjustments on associated
equipment, the only adjustment normally necessary
on a Type FLA regulator is the pressure setting
of the pilot control spring. Turning the adjusting
screw clockwise into the spring case increases the
spring compression and pressure setting. Turning
the adjusting screw counterclockwise decreases the
spring compression and pressure setting.
Pilot Adjustment
2. Connect the control line of a wide-open monitoring
regulator (Figure 3) to downstream piping near
the working regulator control line connection.
During normal operation the wide- open monitoring
regulator stands wide open with the pressure
reduction being taken across the working
regulator. Only in case of working regulator failure
does the wide-open monitoring regulator take
control at its slightly higher setting.
Pre-startup Considerations
Each regulator is factory-set for the outlet pressure
specied on the order. If no setting was specied,
outlet pressure was factory-set at the mid-range
of the pilot control spring. Before beginning the
startup procedures in this section, make sure the
following conditions are in effect:
• Block valves isolate the regulator
• Vent valves are closed
• Hand valves are closed
• A bypass, if any, is in operation
In all cases, check the control spring setting to make
sure it is correct for the application.
To change the regulator outlet pressure, loosen the
locknut, and turn the adjusting screw clockwise to
increase pressure or counterclockwise to decrease
pressure. Then tighten the locknut to maintain the
adjustment position.
Startup
1. Open the upstream block (isolating) valve. Open
the hand valve in the external pilot supply line
before opening the downstream isolating valve.
2. Open the downstream block (isolating) valve for
minimum ow.
3. Slowly open the hand valve in the downstream
control line, while at the same time adjusting the
pilot setting, if necessary.
4. Completely open the downstream block valve.
5. Slowly close the bypass valve, if any.
Wide-Open Monitor Regulator
Installation
1. For both the wide-open monitoring regulator and
the working regulator, perform the Single Pilot
Regulator Installation procedures through Step 9.
CAUTION
Introduce pilot supply pressure into
the regulator before introducing any
downstream pressure, or internal
damage may occur due to reverse
pressurization of the pilot and main
valve components.
Always use pressure gauges to monitor
downstream pressure during startup.
If the downstream is pressurized
by another regulator, plan startup
procedures accordingly.
Note
Pilot supply pressure must exceed
control pressure by at least 1.03 bar /
15 psig in order to operate the regulator
at rated travel.
Although remote loading or control constructions
may require separate adjustments on associated
equipment, the only adjustment normally necessary
on a Type FLA regulator is the pressure setting of
the pilot control spring. Turning the adjusting screw
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FLA Series
clockwise into the spring case increases the spring
compression and pressure setting. Turning the
adjusting screw counterclockwise decreases the
spring compression and pressure setting.
Pilot Adjustment
To change the regulator outlet pressure, loosen the
locknut, and turn the adjusting screw clockwise to
increase pressure or counterclockwise to decrease
pressure. Then tighten the locknut to maintain the
adjustment position.
Startup
This procedure is to be repeated in turn for each
regulator in the installation.
1. Slowly open the hand valve in the pilot supply line.
2. Slowly open the upstream block (isolating) valve
and partially open the downstream block valve
for minimum ow.
3. Slowly open the hand valve in the control line
while, at the same time, adjusting the pilot
setting if necessary.
4. Completely open the downstream block valve.
5. Slowly close the bypass valve, if any.
Working Monitor Regulator
Installation
All Type FLA working monitor regulators are bench
set at the factory according to the service conditions
specied on the customer’s order.
Install the Type FLA using adequate gaskets for
anged regulator units and good piping practices.
Be sure to provide suitable pressure gauges where
appropriate, block valves, bypass valves and
piping, and bleed valves to permit safe and easy
maintenance of both the working monitor regulator
and the second-stage working regulator. Be sure ow
will be in the direction indicated by the arrow cast on
the body.
Refer to Figures 3 and 4, and proceed in the
following steps.
1. Connect control lines as shown in Figure 3.
2. Connect the pilot supply pressure to the
Type SA/2 and from the Type SA/2 to the pilots
(Figure 3). Supply pressure should be ltered.
3. Install downstream working regulator per guidelines.
Startup
1. Before introducing any pressure to the unit,
close the hand valve in the distribution pressure
control line and the hand valve in the intermediate
pressure control line.
CAUTION
Pilot supply pressure must be
introduced into the regulator prior
to introduction of any downstream
pressure or internal damage may
occur due to reverse pressurization of
the pilot and main valve components.
Pilot supply pressure must be at least
1.03 bar / 15 psi greater than control
pressure for proper operation.
2. Slowly open the hand valve in the pilot supply line.
3. Slowly open the upstream block valve and
partially open the downstream block valve for
minimum ow.
4. Slowly open the hand valve and allow the
intermediate pressure to increase to the working
pilot setting.
5. Put the second-stage working regulator
into operation according to recommended
procedures and instructions furnished with the
second-stage working regulator.
6. After the distribution pressure has been
established slowly open the hand valve.
Pilot Adjustment
The second-stage working regulator must be set to
operate at a lower pressure than the monitoring pilot
or the monitoring pilot will try to take control of the
distribution pressure. Follow the steps listed to obtain
the desired results.
1. Increase the setting of the monitoring pilot by
loosening the locknut and turning the adjusting
screw clockwise (into the spring case cap) until
the working pilot is in control of the intermediate
pressure and the second-stage working regulator
is in control of the distribution pressure.
2. Adjust the setting of the working pilot by
loosening the locknut and turning the adjusting
screw clockwise (into the spring case cap)
to increase the intermediate pressure, or
counterclockwise (out of the spring case cap) to
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