Emerson Fisher CT88 Instruction Manual
Instruction Manual
D104030X012
May 2019
Type CT88 Backpressure Regulator
Table of Contents
Introduction .................................................................. 1
Specifications .............................................................. 2
Principle of Operation .................................................. 2
Installation ................................................................... 3
Overpressure Protection.............................................. 4
Startup ......................................................................... 4
Adjustment...................................................................5
Shutdown.....................................................................5
Maintenance ................................................................ 5
Parts Ordering ............................................................. 8
Parts List......................................................................9
Type CT88
WARNING
!
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
re and/or chemical contamination
causing property damage and personal
injury or death.
Fisher™ backpressure regulators must
be installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations
and Emerson Process Management
Regulator Technologies, Inc.
(Emerson) instructions.
If a leak develops or if the outlet
continually vents liquid, service to
the unit may be required. Failure
to correct trouble could result in a
hazardous condition. Only a qualied
person must install or service the unit.
Installation, operation and maintenance
procedures performed by unqualied
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury.
Figure 1. Type CT88
Use qualied personnel when installing,
operating and maintaining the Type CT88
backpressure regulator.
Introduction
Scope of the Manual
This Instruction Manual provides instructions
for the installation, adjustment, maintenance
and parts ordering information of Type CT88
backpressure regulator.
Product Description
The Type CT88 backpressure regulator (Figure 1) is
used to maintain backpressure on Lease Automatic
Custody Transfer (LACT) skids. It is designed to allow
accurate measurement by the positive displacement
pump or coriolis meter and protect other upstream
LACT skid equipment. The high ow capability,
as compared with other backpressure regulators,
maximizes transfer efciency.
Type CT88
Specications
The Specications section lists the specications for the Type CT88 backpressure regulators. Factory specication is
stamped on the nameplate fastened on the backpressure regulator at the factory.
Body Sizes
NPS 2, 3 and 4 / DN 50, 80 and 100
End Connection
CL150 RF
Maximum Working Pressure
(1)(4)
Based on CL150 RF Flange Pressure Rating,
See Table 1
Backpressure Control Ranges
(1)(2)
NPS 2 / DN 50: 10 to 145 psi / 0.7 to 10 bar
NPS 3 and 4 / DN 80 and 100: 15 to 145 psi /
1.0 to 10 bar
Wide-Open Flow Coefcients C
v
NPS 2 / DN 50–Cv: 59
NPS 3 / DN 80–Cv: 148
Shutoff Classication
ANSI Class VI
Temperature Capabilities
Fluorocarbon (FKM)
Construction Materials
Body: Carbon steel (WCB)
Diaphragm and Seals: Fluorocarbon (FKM)
Trim Parts: 316 Stainless steel
Control Line Connection Size
1/4 NPT
Approximate Weights
NPS 2 / DN 50: 89 lbs / 40 kg
NPS 3 / DN 80: 131 lbs / 60 kg
NPS 4 / DN 100: 184 lbs / 84 kg
NPS 4 / DN 100–Cv: 240
Flow Characteristic
Quick Open
1. The pressure/temperature limits in this Instruction Manual and any applicable standard limitation should not be exceeded.
2. For lower set pressures, contact the factory.
3. It may be assumed that the material temperature is the same as the working uid temperature.
4. Maximum inlet pressure depends on working temperature (Refer to ASME B16.42 or Table 1).
5. Fluorocarbon (FKM) is limited to 200°F / 93°C for hot water.
6. Increased working temperature may reduce the maximum inlet pressure range (Refer to ASME B16.42 or Table 1).
(1)(3)
(5)
: 20 to 248°F / -7 to 120°C
(6)
Table 1. Pressure-Temperature Ratings for CL150 Carbon steel (WCB)
TEMPERATURE
20 to 100 290
-7 to 38
1. For intermediate temperatures, linear interpolation is permitted.
(1)
°F psi
200 260
248 245
°C bar
50
100
120
Principle of Operation
See Figure 2. Type CT88 direct-operated
backpressure regulator responds to changes in inlet
pressure. Inlet pressure is registered on the underside
of the diaphragm through an external sensing line that
is connected to the lower diaphragm casing.
As long as the inlet pressure remains below setpoint,
control spring keeps the disk against the seat ring
providing tight shutoff with no ow through the
backpressure regulator.
MAXIMUM WORKING PRESSURE
20.0
17.0
17.9
16.9
When inlet pressure rises above the set pressure,
pressure on the diaphragm overcomes the control
spring force. This causes the diaphragm to move
upward, lifting valve stem together with the valve plug
away from seat ring. The ow path through the valve
opens and excess pressure is vented. When upstream
pressure drops below setpoint, the valve closes.
2
VENT
Type CT88
ADJUSTING SCREW
VENT
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Figure 2. Type CT88 Backpressure Regulator Operational Schematic
Installation
WARNING
!
Personal injury or system damage may
result if this backpressure regulator
is installed, without appropriate
overpressure protection, where service
conditions could exceed the limits given
in the Specications section and/or
backpressure regulator nameplate. Refer
to Overpressure Protection section for
recommendations on how to prevent
service conditions from exceeding
those limits.
Additionally, physical damage to the
backpressure regulator may result in
personal injury or property damage due
to escaping of accumulated uid. To
avoid such injury and damage, install the
backpressure regulator in a safe location.
All vents should be kept open to permit
free ow of gas to the atmosphere.
Protect openings against entrance of
rain, snow, insects or any other foreign
material that may plug the vent.
SPRING CASE
SEAT RING
CONTROL SPRING
DIAPHRAGM
VALVE SPRING
BODY
SENSING LINE
Do not install the Type CT88
backpressure regulator in hazardous
or ammable service indoors or in
an enclosure where accumulation of
vented uid may occur. In hazardous
or ammable uid applications, vented
uid may accumulate and cause
personal injury, death, or property
damage due to re, explosion and/or
chemical contamination.
Note
To avoid premature wear of internal
parts, it is recommended that the
actuator be oriented vertically as shown
in Figures 1 and 2.
General Installation Instructions
• Vertical installation with the actuator installed
directly above the main valve is recommended for
optimal performance, as shown in Figures 1 and 2.
• The use of the bleed plug is recommended for
installations of the actuator mounted above the
main valve.
3
Type CT88
• The unit will operate in horizontal installations with
the actuator on the side, however, this could result
in premature wear of the parts.
• Make sure that ow will be in the same direction as
indicated by the ow arrow on the body.
Note
For proper backpressure regulator
control and operation, make sure that the
ow arrow matches the ow direction.
CAUTION
To protect against precipitation,
make sure that the actuator is
oriented upward.
Some installations, such as areas with heavy
snowfall, may require a hood or enclosure to protect
the backpressure regulator from snow load and vent
freeze over.
1. Before installing the backpressure regulator:
• Check for damage which might have occurred
during shipment.
• Check and remove any dirt or foreign
material which may have accumulated in the
backpressure regulator body.
• Blow out any debris, dirt or copper sulfate in the
tubing and pipeline.
2. Body installed horizontally with the actuator spring
case pointing upward is recommended.
3. Use gaskets between pipeline and regulator
anges when installing a regulator with anged
end connections. Use approved piping procedures
when installing the regulator.
Overpressure Protection
WARNING
!
Personal injury, equipment damage or
leakage due to escaping accumulated
liquid or bursting of pressure-containing
parts may result if this backpressure
regulator is:
- Overpressurized;
- Used with incompatible process uid;
- Installed where service conditions
could exceed the limits given in the
Specications section and on the
appropriate nameplate; or
- Where conditions exceed any
ratings of adjacent piping or
piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices to prevent service conditions
from exceeding those limits.
Overpressuring any portion of this equipment may
result in equipment damage, leaks in the backpressure
regulator or personal injury due to bursting of
pressure-containing parts. The system should be
inspected after any overpressure condition.
The backpressure control range and maximum inlet
pressure can be found in the Specications section.
Startup
WARNING
!
To avoid possible personal injury,
equipment damage or leakage due
to escaping uid, make certain the
backpressure regulator is installed as
instructed in the Installation section.
Escaping process uid from an open
bleed plug may result in backpressure
regulator damage, personal injury and
property damage. To avoid such injury
and damage, make certain the bleed
plug is properly closed after venting air.
Always open bleed plugs slowly. These
plugs contain no packing, so some uid
weepage will occur when the plugs
are opened. Operating personnel must
protect themselves from exposure to
system uids.
CAUTION
Pressure gauges must always be
used to monitor upstream pressure
during startup.
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