Fisher ACE95Sr, ACE95 Instruction Manual
Instruction Manual
Form 5667
T ype A CE95 and T ype A CE95Sr
T ank Blanketing V alves
ACE95 Series
W8156
Figure 1. Type ACE95 T ank Blank eting V alve
Introduction
Scope of Manual
This instruction manual provides installation, startup,
and maintenance procedures for the ACE95 Series
(T ype A CE95 and Type ACE95Sr) tank b lanketing
valves. See figures 1 and 2.
Product Description
ACE95 Series tank blanketing valves are self-contained, balanced, pilot operated, and used for accurate
pressure control on gas blanketing systems. These
valves help control emissions and provide protection
against atmospheric contamination. ACE95 Series
Patent Numbers 5,884,655 and 5,836,348
W8155
Figure 2. T ype ACE95Sr T ank Blanketing Valv e
valves maintain a positive pressure and thereby reduce
the possibility of tank wall collapse during pump out
operations, in addition to preventing liquid from vaporizing into the atmosphere.
Specifications
The following page lists specifications and ratings for
ACE95 Series tank blanketing valv es . Factory specifications are stamped on a nameplate fastened to the
upper actuator case of the valve.
D102775X012
04/01
www.FISHERregulators.com
ACE95 Series
Specifications
Size and End Connection Style
1-inch: NPT
1-inch: ANSI CL150 RF
1-inch: ANSI CL 150 RF, Weldneck
1-inch: NPT x 2-inch ANSI CL 150 RF
2-inch: NPT
2-inch: ANSI CL 150 RF
2-inch: ANSI CL 300 RF
2-inch: NPT x 3-inch Tank Flange
Maximum Operating Inlet Pressure
200 psig (13,8 bar)
Maximum Outlet (casing) Pressure
20 psig (1,4 bar)
Maximum Operating Outlet Pressure
1.5 psig (103 mbar)
Outlet Pressure Ranges
-5.0-inch w.c. to 1.5 psig
(-12 mbar to 103 mbar)
see table 1
Pressure Registration
External
Flow Coefficients for Relief Valve Sizing
(110% of rated Cv)
Type A CE95: Type A CE95Sr:
Cv 1 use Cv 1.1 Cv 20 use Cv 22
Cv 2 use Cv 2.2 Cv 45 use Cv 50
Cv 4 use Cv 4.4 Cv 60 use Cv 66
Cv 7.5 use Cv 8.25
Cv 10 use Cv 11
Temperature Capabilities
Nitrile (NBR):
–20° to 180°F (–7° to 82°C)
Flourelastomer:
0° to 212°F (–0° to 100°C)
EPDM (FDA):
–20° to 212°F (–7° to 100°C)
FFKM:
–20° to 212°F (–7° to 100°C)
Approximate W eight
With all accessories:
Type ACE95 - 40 lbs (18 kg)
Type ACE95Sr - 60 lbs (27 kg)
Main Valve Flow Characteristic
Linear
T able 1. Outlet (Control) Pressure Ranges
EGNAR
ERUSSERP)LORTNOC(TELTUO
)rabm2,1-ot21-(cwni-5.0-ot5-leetSsselniatS
)rabm2ot2-(cwni-1ot1-leetSsselniatS
)rabm21ot2,1(cwni-5ot5.0
)rabm52ot01(cwni-01ot4
)rabm63ot02(cwni-51ot8
)rabm301ot43(gisp5.1ot5.0
.ylbmessamgarhpaidehtrednudetacolsignirpsdnocesehT.1
LAIRETAMGNIRPS
leetSsselniatS
leetSsselniatS
leetSsselniatS
leetSsselniatS
Principle of Operation
ACE95 Series tank blanketing valves are pilot operated, activated by the diaphragm, and control the vapor
space pressure over a stored liquid. The unit is controlled by a ve ry large diaphragm actuator. The oversized actuator offers high sensitivity to changes in tank
,HTGNELEERFGNIRPS
)mm(SEHCNI
)58,96(57.2
)1(
)253,22(88.0
)58,96(57.2
)1(
))46,04(06.1
)58,96(57.2
)8,05(00.2
)8,05(00.2
)58,96(57.2
,RETEMAIDERIWGNIRPS
)mm(SEHCNI
)230,2(080.0
)1(
)951,2(580.0
)230,2(080.0
)1(
)156,1(560.0
)230,2(080.0
)548,2(211.0
)571,3(521.0
)517,5(522.0
pressure. When a stor age tank cools and tank vapors
condense, ACE95 Series valves replace the condensing vapors with an inert gas to prevent internal tank
pressure from decreasing. P ositive tank pressure
prevents outside air from contaminating the product and
reduces the possibility of atmospheric pressure collapsing the tank. As demand is satisfied, the valve closes.
2
ORIFICE
E0623
PILOT V AL VE (OPEN)
ROLLING DIAPHRAGM
DIAGNOSTIC PORT
PILOT SPRING
ACE95 Series
RANGE SPRING
SENSING
LINE
INLET PRESSURE
TANK PRESSURE
INLET BLEED PRESSURE
ATMOSPHERIC PRESSURE
E0622
Figure 3. ACE95 Series Operational Schematic (valve open)
ACE95 Series valves respond to slight decreases in
internal tank pressure by opening and increasing the
flow rate of inert gas into the tank. When the tank’s
liquid level has been lowered to the desired point and
the vapor pressure set point is re-established, the valve
closes.
Installation and Startup
Personal injury , equipment damage, or
leakage due to escaping accumulated gas
or bursting of pressure-containing parts
may result if this gas blanketing system
is over pressured or installed where
service conditions could exceed the
limits given in the Specifications section
and on the appropriate nameplate, or
where conditions exceed any ratings of
the adjacent piping or piping connections.
T o av oid such injury or damage, pro vide
pressure-relieving or pressure-limiting
devices (as required by Title 49, Part 192,
of the U.S. Code of Federal Regulations,
by the National Fuel Gas Code Title 54 of
the National Fire Codes of the National
Fire Protection Agency , or by other
applicable codes) to prevent service
conditions from exceeding those limits.
Additionally , physical damage to the tank
blanketing system could result in personal injury and property damage due to
escaping accumulated gas. T o avoid such
injury and damage, install the tank
blanketing valve in a safe location.
3
ACE95 Series
BLANKETING GAS
SUPPL Y LINE
LINE STRAINER
SHUT-OFF V AL VE
SENSING LINE
TANK VENT
BLANKETING
GAS TO T ANK
GAS
LIQUID
E0623
Figure 4. A CE95 Series Tank Blanketing V alve Installation
This ACE95 Series valve was assembled and preset to
the customer specified pressure and set point. The
outlet pressure range of the valve is stamped on the
nameplate fastened to the upper actuator case. The gas
blanketing set point is the only adjustable feature on
this unit.
1. Use qualified personnel when installing, operating,
and maintaining valves. Before installing, inspect the
valve and tubing for any shipment damage or foreign
material that may have collected. Make certain the
body interior is clean and the pipelines are free of
foreign material. Apply pipe compound only to the male
pipe threads with a screwed body, or use suitable line
gaskets and good bolting practices with a flanged body.
2. Inspect the nameplate on the upper actuator case.
It displays the model number , serial number , a b lanketing gas supply pressure range, and the maximum inlet
pressure and set pressure. These m ust agree with the
system that you are blank eting. The serial number will
be needed in any communication with your Fisher Sales
Representative or the Fisher Sales Office.
3. Clean the gas blanketing supply lines of all dirt and
foreign material before connecting them to the ACE95
Series tank blanketing valve.
SHUT-OFF V AL VE
EMERGENCY
TANK VENT
SHUT-OFF VA L VE
TANK
4. The valve must be mounted so the actuator case
is horizontal. The v alve should be mounted abo ve the
tank. Three connections are required: a) blanketing gas
supply to valve, b) valve outlet to tank, and c) sensing
line to tank.
Piping Considerations
Undersized piping may inadequately
deliver blanketing gas at the specified
inlet pressure under full flow conditions.
This may result in unacceptable performance under high demand conditions.
Unnecessarily long or restricted outlet
piping may result in poor set point
control.
Inlet Piping
The blanketing gas supply line should be equipped with
a Number 100 mesh strainer to remove dirt and pipe
scale. Inlet piping must be sized to adequately deliver
4
ACE95 Series
blanketing gas at the specified inlet pressure under full
flow conditions.
Outlet Piping
Type ACE95 or Type ACE95Sr valve outlet is piped into
the tank vapor space. Outlet piping must be full size
and self-draining to the tank. The valve should be
situated above and as close as possible to the tank
vapor space for best performance.
Sensing Line
The sensing line should be 1/2-inch tubing or pipe,
must slope toward the tank, and should not contain low
points (or traps) that could catch liquid. The sensing line
must enter the tank above the liquid level at a point that
senses the vapor space pressure and is free from
turbulence associated with tank nozzles or vents.
Note
Best control is obtained when both
connections to the tank are separate. If
the tank has only one available nozzle,
contact Fisher Controls for alternate
methods of installation. A single array
manifold is available for such situations.
order could result in inlet pressure being
applied to the actuator casing, potentially damaging it.
Startup
1. Open shut-off valves between the blanketing valve
and the tank (both sensing and outlet). See figure 4.
2. Slowly open the supply line shut-off valve (to the
blanketing valve) and leave it fully open.
3. Monitor the tank vapor space pressure.
ADJUSTING SCREW
(KEY 2)
ACTUATOR CAP
(KEY 1)
VENT
(KEY 6)
LOCK NUT
(KEY 3)
Gauges and Shut-Off Valves
Inlet gas shut-off valves are desirable for servicing. If
this ACE95 Series tank blanketing valve was not
ordered with an inlet pressure gauge, it is advisable to
install a gauge between the inlet shut-off valve and the
blanketing valve.
Note
Safety considerations may dictate full
port shut-off valves between the tank and
blanketing valve, and at the valve inlet.
Startup, Adjustment, and Shutdown
Note
T ank vents and safety relief valves m ust
be in place and operating.
SPRING CASE
(KEY 7)
W8160
Figure 5. Spring Case, Adjusting Scre w, and Actuator Cap
Adjustment
The set point of this unit is factory set. If an adjustment
is to be made, it should be done so in small increments
while the unit is supplying gas to the tank. T o change
the set point:
1. Unscrew and remove the actuator cap (key 1) from
the top of the spring case (key 7). See figure 5.
2. Loosen the lock nut (key 3) and turn the adjusting
screw (ke y 2) clockwise to r aise the set point. (T urning
the screw counter-clockwise lowers the set point.)
3. Observe the effects of the change.
4. When the adjustment is complete, tighten the lock
nut (key 3) and replace the actuator cap (key 1).
Always open the outlet valve before the
inlet valve. Operation in the reverse
5
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