Flowserve 682-53B System User manual

Experience In Motion
682-53B System
USER INSTRUCTIONS
Installation
Operation
Maintenance

Flowserve.com 2SSIOM000742-00 (EN/AQ) November 2022
682-53B System
CONTENTS
1 Introduction 3
1.1 About this manual 3
1.2 How to use this manual 3
1.3 Other supplied documentation 3
1.4 Conformity with norms and directives 3
1.5 Use of alerts and icons 4
2 Safety 5
2.1 682-53B hazards 5
2.2 General safety 5
2.3 Trained and qualied personnel 5
2.4 Personal protective equipment (PPE) 6
3 Environmental Considerations 7
3.1 Disposing of waste products 7
3.2 End-of-life equipment 7
4 Design Overview 8
4.1 Purpose of 682-53B 8
4.2 Typical 682-53B installations 8
4.3 P & ID 9
4.4 Parts 10
4.5 Theory of operation (typical system) 12
4.6 Identifying the product (nameplate) 12
4.7 682-53B Product offerings 12
5 Transport and Storage Requirements 13
6 Installation 14
6.1 Introduction 14
6.2 Installation requirements 14
6.2.1 Safety considerations 14
6.2.2 System seal cooler mounting height 15
6.2.3 Interconnecting pipes 15
6.3 Installation procedure 15
7 Operation 18
7.1 Set up system 18
7.2 Start up system 19
7.3 Monitor system 19
7.4 Shut down system 20
8 Maintenance 21
8.1 Introduction 21
8.2 Periodic maintenance tables 21
8.3 Check barrier uid pressure 21
8.4 Rell barrier uid 22
8.5 Change barrier uid 22
8.6 Check accumulator pressure 23
8.7 Charge accumulator 24
9 Troubleshooting 26
10 Spare Parts 27
11 Appendix 28
11.1 System logbook 28
11.2 GA drawings 29
11.3 Vendor documentation 30
Copyright
Copyright Flowserve © November 2022. Published by Flowserve.
This manual contains regulations and drawings of a technical
nature. No part of this document may be reproduced or
distributed by any means, or used for competitive purposes,
without the written consent of the publisher
All information (including illustrations) in this manual is subject
to change without prior notice. Flowserve does not accept any
liability for any instance of damage or malfunction through
non-adherence to these instructions.

Flowserve.com 3SSIOM000742-00 (EN/AQ) November 2022
682-53B System
1 Introduction
1.1 About this manual
This manual (which is intended for operating,
maintenance, and supervisory personnel) provides
information on installing, operating, and maintaining the
682-53B system.
NOTE: As hazardous conditions can result from planned
as well as unforeseen circumstances, pressurized
equipment shall always be operated with caution.
Before installation, equipment should always be fully
inspected including, but not limited to checking for:
• Any possible damage due to transport or storage
• Cleanliness, required before operation
• Existence of an afxed nameplate with correct
inspection markings and design/test conditions
clearly annotated
1.2 How to use this manual
Only trained and qualied personnel should use this
manual. Refer to section 2.3. Inexperienced personnel
should only work on this system under the supervision of
a qualied person.
Before using this manual, make sure you have fully read
and understood the safety section. If you are new to
the system, pay particular attention to section 4, which
describes the system in detail.
When maintaining the system, always make sure you
follow the maintenance procedures. Pay particular
attention to the alerts and icons.
1.3 Other supplied documentation
The appendix contains the General Arrangement
drawings (called GA drawings) and documentation on the
vendor parts. The instructions in this manual sometimes
refer to the vendor documentation. If a reference is
made to the vendor documentation, you must follow the
instructions in that documentation as well.
1.4 Conformity with norms and directives
The 682-53B system conforms to the following norms
and directives (if applicable):
• Machine directive/2006/42/EC
• NEN 5509:2016
• ATEX Directive 2014/34/EU
• PED 2014/68/EU
• ASME B31.3
• ASME BPVC Section VIII Div. 1
• API Standard 682

Flowserve.com 4SSIOM000742-00 (EN/AQ) November 2022
682-53B System
1.5 Use of alerts and icons
This manual uses “Notes”, “Cautions”, “Warnings”, and
“Dangers” to alert you of important information and
dangerous situations. These alerts (from the least severe
to the most severe) are:
NOTE: “Notes” inform you of important additional
information.
aCAUTION: The equipment, product or surrounding
area can be damaged if the “caution” is not obeyed.
úWARNING: Personnel can be (seriously) injured, or
the equipment can be seriously damaged if the
“warning” is not obeyed.
c DANGER: Personnel can be seriously injured
(resulting in death) if the “danger” is not obeyed.
c DANGER/WARNING: Dangers or Warnings that refer
to the use of the system in potentially explosive
atmosphere – in accordance with the ATEX
Directive 2014/34/EU.
The above icons are the general icons that are used for
“Cautions”, “Warnings”, and “Dangers”. More specic
icons are also used, depending on the type of hazard.
Refer to the following example:
úWARNING – HIGH PRESSURE: The accumulator can
burst if it is over pressurized. Fill the accumulator
slowly; check the pressure gauge regularly.
STOP
STOP

Flowserve.com 5SSIOM000742-00 (EN/AQ) November 2022
682-53B System
2 Safety
2.1 682-53B hazards
The following hazards can be present in the 682-53B
system:
• High pressure
• Explosion
• Dangerous chemicals/media
• Temperature (hot surfaces)
• Nitrogen (N2) in the accumulator
• Dangerous moving parts (during installation)
If the 682-53B system has any external leaks, you must
stop the system immediately and have the leak repaired
by qualied personnel.
2.2 General safety
When installing, operating and maintaining the system,
pay particular attention to safety:
• Obey all applicable safety laws and regulations.
• Obey all plant regulations.
• Make sure that only trained and qualied personnel
work on the system. Refer to section 2.3.
• Read and understand each part of this manual.
• Follow the installation, maintenance and operating
procedures exactly.
• Wear the relevant personal protective equipment (PPE).
Refer to section 2.4.
• Never work alone.
• Make sure that adequate safety equipment is installed
in and around the work area: rst aid kits, safety
showers (if applicable), re extinguishers, escape
routes, shut-off valves, etc.
• Make sure that personnel are fully trained on how to
use the safety equipment. A qualied rst aid specialist
must always be available for each shift.
• Read the plant requirements for handling hazardous
materials.
• Check MSDS for relevant information.
2.3 Trained and qualified personnel
Qualied personnel are people who have been authorized
by those responsible for the safety of the Plant to perform
the necessary work, and who can recognize and avoid
possible dangers. The following aspects determine the
qualication of personnel:
• Appropriate training
• Relevant experience
• Knowledge of relevant standards and specications
• Knowledge of accident prevention regulations
• Knowledge of plant regulations and operating conditions

Flowserve.com 6SSIOM000742-00 (EN/AQ) November 2022
682-53B System
2.4 Personal protective equipment (PPE)
The 682-53B is often used for applications containing
high-pressure, dangerous and/or toxic chemicals. When
operating or maintaining this system, make sure you wear
the appropriate PPE: protective clothing, gloves, safety
glasses, etc.
Always follow local regulations regarding PPE.
If one (or more) of the below icons is shown in the work
place, the equipment must be worn at all time.
When operating outside, PPE to be worn to prevent slip,
trip and/or fall.

Flowserve.com 7SSIOM000742-00 (EN/AQ) November 2022
682-53B System
3 Environmental Considerations
aCAUTION: You are required by law to dispose
of waste products and end of life equipment,
according to local regulations.
3.1 Disposing of waste products
Any waste products resulting from the use or maintenance
of the 682-53B must be disposed of according to local
environment laws and regulations.
3.2 End-of-life equipment
úWARNING – DANGER CHEMICALS: Dangerous
chemical might be released during removal of the
system. Wear PPE. Follow all safety regulations and
Plant regulations.
úWARNING – HIGH PRESSURE: High pressure might
be stored in the system. Before removing or
re-installing the system, make sure the entire
system has been de-pressurized (and drained if
required).
NOTE: End-of-life equipment must be disposed of
according to local environment laws and regulations.
STOP
STOP

Flowserve.com 8SSIOM000742-00 (EN/AQ) November 2022
682-53B System
4 Design Overview
4.1 Purpose of 682-53B
• Prevents a dual pressurized seal from leaking process
media to atmosphere by circulating a pressurized
barrier uid over the mechanical seal.
• A bladder accumulator is applied to isolate the nitrogen
from the barrier uid and establish a higher pressure
than in the seal chamber.
• Regulate the temperature of the barrier uid by
including a heat exchanger with water or air.
• Monitors the performance of the mechanical seal by
measuring (optionally) pressure, temperature, ow and
rell time.
• Lubricate the seal faces.
4.2 Typical 682-53B installations
This section describes typical 682-53B installations. The
exact system design and (optional) components can
vary depending on the options selected. For detailed
information on the 682-53B installation, refer to the GA
drawing(s) in the appendix.

Flowserve.com 9SSIOM000742-00 (EN/AQ) November 2022
682-53B System
4.3 P & ID
In each 682-53B drawing a P & ID is included, showing
the components and piping ow. For the dedicated P & ID,
refer to GA drawing in the appendix.
Figure 1: Typical schematic overview

Flowserve.com 10SSIOM000742-00 (EN/AQ) November 2022
682-53B System
4.4 Parts
Number Part Function
1 Bladder accumulator Stores energy, contains pressurized barrier uid for lubricating and cooling a
pressurized dual mechanical seal
2 Seal cooler
Used for cooling the uid. Three types are available: water cooler, nned tube/
pipe and forced draft air (size depends on the operating conditions). The cooler
can be installed separately if there is insufcient space
3 Pressure transmitter (PT) Used for pressure alarm and monitoring the pressure
4 Block and bleed valve Used to isolate pressure transmitter and vent transmitter side
5 Drain valve Used for draining the system
6 Vent valve Used for venting the system
7 Instrument valve Used for isolating the instrumentation from barrier pressure
8 Block valve Used for closing off the ll inlet line
9 Non-return valve To prevent a backow when opening the block valve
10 Y-strainer Remove solids from barrier uid during lling
Standard parts

Flowserve.com 11SSIOM000742-00 (EN/AQ) November 2022
682-53B System
Optional parts (parts can be configured as option)
Number Part Function
11 Hand pump Used to rell barrier uid
12 CSA heated accumulator
blanket
Used to insulate and heat bladder accumulator to reduce pressure uctuations
due to temperature changes
13 Floating alarm Used to implement oating alarm strategy per API 682 4th Edition
14 Accumulator isolation Pressure gauge and isolation valve used to check bladder integrity when not
in service
15 ATEX heated accumulator
blanket
Used to insulate and heat bladder accumulator to reduce pressure uctuations
due to temperature changes
úWARNING: Accumulator Isolation Valve, Item 14,
should not be closed during operation, as it can
lead to dangerous pressure fluctuations.
Refer to the P & ID in appendix for applicable instruments.
STOP

Flowserve.com 12SSIOM000742-00 (EN/AQ) November 2022
682-53B System
4.5 Theory of operation (typical system)
NOTE: The numbers in the following description refer
to the numbers used in the standard and optional parts
tables shown in paragraph 4.4.
• A non-toxic barrier uid is supplied to the cavity
between the inner seal and outer seal of a dual
pressurized seal. A bladder accumulator (1) ensures
that the pressure of this barrier uid is at least 1.4
barg (20 psi) [depending on the seal type] higher than
the seal chamber pressure. This prevents pumping
product leaking through the mechanical seal into the
atmosphere.
• The accumulator is equipped with an elastomer
bladder. This bladder is lled with N2. The N2 stores
energy, to keep the barrier uid pressurized.
• The barrier uid is captured in a closed loop. An integral
pumping device circulates the barrier uid through the
closed loop. The barrier uid lubricates the inner and
outer seal. If the circulating ow is too low, an external
circulation device (e.g., circulation pump) shall be used
instead. The circulated barrier uid passes through a
cooler (2), to lower the temperature.
• As a part of system design, a calculated amount of
barrier uid is allowed to leak into the sealed uid.
This ensures that the sealed uid can never enter
the atmosphere. Due to the leakage over the seal,
the pressure in the closed loop will drop slightly, but
will automatically be compensated by the stored N2
pressure in the accumulator. A pressure transmitter (3)
indicates when the barrier uid is below the minimum
pressure. The barrier uid must then be relled to the
maximum pressure as specied in the GA drawing(s)
in the appendix. The N2pressure in the accumulator is
checked once a year as a part of periodic maintenance.
NOTE: The system must be tted with a pressure
transmitter that will generate an alarm when the barrier uid
reaches the minimum pressure.
4.6 Identifying the product (nameplate)
The nameplate is, as per Flowserve standard, shown in the
GA drawing.
This nameplate provides the necessary information
regarding the system.
For information on the nameplate, see the attachments in
“Chapter 12 Appendix”.
4.7 682-53B product offerings

Flowserve.com 13SSIOM000742-00 (EN/AQ) November 2022
682-53B System
5 Transport and Storage Requirements
Full storage procedure (FTA106) can be obtained from
Flowserve representative.
Below is an extract of the procedure.
Transport and
storage criteria Requirements
Transportation The system must be transported and stored in the unopened, original shipping box.
Instructions on the shipping box shall be followed.
Suspect damaged during
transportation
Systems that have been dropped, or have been subjected to heavy impacts during transport,
must not be installed. The Flowserve representative shall be contacted.
Warehouse requirements The warehouse must be dry and dust free. The system should not be exposed to large
temperature uctuations, high humidity or radiation and shall be stored in the original box.
Long-term storage After a storage period of 1 year, the system must be inspected for its “as new” properties.
This applies particularly to the instrumentation and bladder of the accumulator.
Preserving installed systems
The preserving medium must not damage the installed system, for example by fouling or
harming the components and mechanical seal. If you are not sure which preserving medium
to use, contact Flowserve representative for preserving procedure.

Flowserve.com 14SSIOM000742-00 (EN/AQ) November 2022
682-53B System
6 Installation
6.1 Introduction
Before installing the system, make sure you have read and
understood the Installation requirements in this section. If
you have any questions regarding the installation of your
system, contact your local Flowserve representative.
6.2 Installation requirements
6.2.1 Safety considerations
Position the 682-53B as close to the seal as possible.
Make sure there is sufcient room for:
• Evacuation of the Plant in case of an emergency (do
not block walkways and emergency exits)
• Safe operation and maintenance of the system
c DANGER – RISK OF EXPLOSION: If the system is
being installed in a hazardous area, there could be
an explosion risk. Make sure all instrumentation has
the adequate explosion protection.
If the system is being installed in a conned area, make
sure there is adequate ventilation.
c DANGER – SUFFOCATION HAZARD: Breathing
N2in a confined space can result in sudden
unconsciousness or death. Take extra care when
working in confined areas.
Adequate ventilation is required for:
• Safe lling of the accumulator with N2
• Correct cooling of the system

Flowserve.com 15SSIOM000742-00 (EN/AQ) November 2022
682-53B System
6.2.2 System seal cooler mounting height
The cooler must be positioned above the seal, unless
a circulation pump is utilized. This will encourage
thermosyphoning when the system is in standby mode
and help with proper venting. The cooler will be mounted
on the 53B stand based on pump centerline selection:
L (300 to 450 mm [11.8 to 17.7 in.]), M (451 to 600 mm
[17.7 to 23.6 in.]), H (601 to 750 mm [23.6 to 29.5 in.]).
6.2.3 Interconnecting pipes
The ow of barrier uid through the system is either
generated by:
• A pumping device, included in the seal design
• An external circulating pump
• Thermosyphoning (hot standby)
The interconnecting pipes between the system and the
mechanical seal must be correctly tted; otherwise the
ow of the barrier uid through the system might be
restricted.
Pay particular attention to the following points:
• Minimize the number of restrictions (for example, limit
the number of ttings).
• The total length of connection piping between the
mechanical seal and 682- 53B shall not exceed 5 m
(16.4 ft) in length per API 682 8.2.5.
• Unless otherwise specied, the pipe size shall be 0.75
in. and schedule shall be the same as the system
piping (or as per specication).
• The pipes must be clean and free of burrs.
• The total pipe length and number of bends shall be kept
to a minimum.
• Use smooth, large radius bends; do not use elbows,
tees, etc.
• Pipe runs should be sloped continuously up or down
to allow for adequate circulation, proper venting and
draining shall be maintained.
• Make sure that the loop, including seal ange, does not
include vapor traps.
Vapor traps will block circulation and overheating will
appear. When vapor traps cannot be avoided, a proper
venting solution shall be added.
• For threaded connections, do not use Teon tape but
Engineering Loctite 577.
NOTE: If isolation valves are part of the interconnecting
piping, these valves shall be full bore and “locked open”
during operation.
6.3 Installation procedure
Use this procedure to install or reinstall the system.
Procedure
1. Before installing the system, inspect all components for
damage. If any of the components are damaged, it shall
be reported to the Flowserve representative.
2. Determine the installed position of the system. Refer to
the Installation requirements.
úWARNING – CRUSH HAZARD: Possible injury and/or
trapped limbs. Take care to avoid being trapped or
crushed between heavy, moving objects.
STOP

Flowserve.com 16SSIOM000742-00 (EN/AQ) November 2022
682-53B System
3. Use an appropriate lifting device together with the
available lifting lugs on the 682-53B, to position
the 682-53B system as close as possible to the
mechanical seal. Make sure you leave sufcient room
for operation and maintenance purposes.
4. Attach the stand rmly to the ground or base-plate of
the equipment
úWARNING – HIGH PRESSURE: The cooling water
circuit of the 682-53B system is not protected
against overpressure. If the return line is closed, a
water line could burst. Make sure a pressure relief
valve is installed in the cooling water circuit.
5. Install the water cooler, according to the Installation
requirements. Refer to sections 6.2.2 and 6.2.3.
6. Manufacture the interconnecting piping according to
the Installation requirements. Refer to section 6.2.4.
NOTE: Not all of the connections in the following step
may apply to your system (some are optional). Also the
names used in this procedure may vary slightly to the
names in the GA drawings. Refer to the GA drawing(s) in
the appendix for full details. In case of doubt, contact the
Flowserve representative.
7. Make the following connections:
• Barrier uid supply line to mechanical seal: Connect the
“to seal connection” to tap LBI (barrier uid inlet) on the
mechanical seal ange.
• Barrier uid return line from mechanical seal: Connect
the “from seal connection” to tap LBO (barrier uid
outlet) on the mechanical seal ange.
• Drain: Connect the “drain connection” to a drain or a
disposal point. Depends on the conguration of the
682-53B.
• Vent: Connect the “vent connection” to a vent or a
disposal point. Depends on the conguration of the
682-53B.
• Fill: Connect the “ll connection” to a xed makeup
unit, or provide quick connect to ll with mobile rell
unit. The ll line is provided in a vertical orientation,
however if preferred the ll line can be rotated 90
degrees to a horizontal orientation with the gate valve
handle pointing up. If the ll line is rotated additional
piping support will be required near the ll connection.
• Cooling water connections Inlet and Outlet: If
applicable, connect the “cooling water inlet line”
to the cooling water IN connection; Connect the
cooling water “outlet line” to the cooling water OUT
connection.
• Electrical connections: Wire the electrical connections
for instrumentation according to the applicable
instrument and plant requirements; Wire the power
supply for the electric motor of a forced draft cooler
(FDC) or circulation pump according to the applicable
electric motor and plant requirements. Refer to the
vendor documentation in the appendix for more
information.
NOTE: For locations of the connections, refer to the
connections table on GA Drawing in appendix.
NOTE: Flange covers provided with system are for
shipping only and are not pressure containing.
STOP

Flowserve.com 17SSIOM000742-00 (EN/AQ) November 2022
682-53B System
c DANGER – EXPLOSION RISK: Static electricity can
build up and ignite flammable vapors. The system
must be correctly earthed to minimize the risk of
explosion caused by static electricity.
8. Make sure the installation is correctly earthed to prevent
the risk of explosion, caused by static electricity.
9. Sign the System Logbook in the appendix to verify that
the installation has been completed according to this
procedure.

Flowserve.com 18SSIOM000742-00 (EN/AQ) November 2022
682-53B System
7 Operation
7.1 Set up system
Use this procedure if:
• The system is being set up for the rst time, or
• The barrier uid has been completely drained from the
system.
Procedure
NOTE: A 682-53B system is not self-venting. Any air
trapped in the barrier uid will have a negative effect on
the performance of the seal. During system set-up venting
is extremely important.
1. Make sure the block bleed valve to the instrumentation
is open (if applicable).
2. Make sure the block valve in the drain line is closed.
3. Make sure the block valve in the vent connection is
closed.
4. Check the pre-charge pressure of the accumulator.
Refer to the GA drawing in Appendix for the required
pressure. For API 682 4th Edition, the oating strategy is
added, where charging pressure is related to ambient
temperature. If oating strategy is applicable, the
pressure, related to the current ambient temperature
shall be considered.
5. If necessary, charge the accumulator with nitrogen.
Refer to the chapter 8.7 “Charge accumulator”.
c DANGER – EQUIPMENT OR PRODUCT DAMAGE:
Dirty or incorrect barrier fluid can damage the
equipment or product. Make sure the barrier fluid
is correct for the product being processed. Do not
over pressurize the system.
6. Connect the lling unit to the ll connection of the
682-53B.
7. Open the block valve(s) in the lling line.
8. Fill the system until the maximum barrier pressure is
reached. When oating strategy is applicable (according
API 682 4th Edition), the maximum barrier pressure that
is related to the current ambient temperature shall be
considered.
Refer to the GA drawing(s) in the appendix for the correct
setting.considered.
úWARNING – HIGH PRESSURE: The 682- 53B can
burst if it is over pressurized. Fill the system slowly;
check the pressure gauge regularly and never
exceed max. operating pressure.
9. Close the block valve in the ll line (if applicable),
depressurize the lling line and disconnect the lling unit
when all steps below are nished (if applicable).
10. Check for leaks at ttings and pipe work, and rectify if
necessary.
11. Vent the instrument lines.
12. Vent the closed loop(s) by carefully opening the vent
valve(s). The pressure in the system will drop.
13. Close the vent valve as soon as the pressure is
reduced to the minimum barrier pressure level Refer to
the GA Drawing in the Appendix for the correct setting.
STOP

Flowserve.com 19SSIOM000742-00 (EN/AQ) November 2022
682-53B System
14. As the pressure reduces, during the venting process,
the pressure transmitter (or switch) and it’s pressure
alarm setting should be checked (if applicable).
15. Rell the system to the maximum barrier pressure.
16. Repeat steps 12 to 15 until all air has been removed
from the system (normally 3 to 4 times).
7.2 Start up system
Use this procedure to start the system.
Procedure
1. Prior to the start-up, the Installation procedure (refer
to section 6.3) and Set-up system procedure (refer to
section 7.1) must be completed, and signed off by a
qualied person.
2. If a water cooler is installed, apply the cooling water.
Refer to the appendix for the correct piping diameter
and ow rate (normally 25 liter/minute).
3. If a forced draft air cooler is installed, make sure the
motor is electrically connected and the fan is rotating
in correct direction (check rotation arrow). Flowserve
recommends to use a soft starter for the electric motor
of the FDC.
4. Make sure all block valves in the circulating loop are
open (if applicable).
5. Start the external circulation pump (if applicable).
c DANGER – RISK OF EXPLOSION: Dangerous
chemicals or vapors can leak into the environment if
the sealing fluid is not correctly pressurized. Always
pressurize the barrier fluid before pressurizing the
equipment; also never de-pressurize the barrier
fluid until the equipment has been fully
de-pressurized, and vented.
NOTE: For dual pressurized (double) seals, the barrier uid
pressure must be at least 1.4 bar (minimum requirement
as per API 682) higher than pressure in the seal chamber,
unless otherwise specied in the GA drawing(s).
6. Make sure the barrier uid is at the correct pressure,
according to the GA drawing(s) in the appendix.
7. Pressurize the equipment in which the seals are installed,
according to the operating procedures of the equipment
manufacturer.
8. Start-up the equipment, according to the operating
procedures of the equipment manufacturer, unless
otherwise specied by Flowserve.
9. Wait until the pump has been running for approximately
15 minutes.
10. Vent the closed loop(s) to remove any residual air. (refer
to section 7.1 point 12 and further).
7.3 Monitor system
Use this procedure to monitor the system.
Procedure
1. Monitor the system for correct operation. Also, refer to
the periodic maintenance tables in section 8.2.
2. Make sure:
• There are no leaks.
• The seals and/or bearings are not running hot.
• There is no cavitation in the system.
• There is no heavy vibration in the system.

Flowserve.com 20SSIOM000742-00 (EN/AQ) November 2022
682-53B System
3. If you notice any problems with the system, follow plant
regulation for reporting and correcting faulty equipment.
4. The 682-53B system should be relled once low
barrier pressure has been reached. An alarm must be
generated if a pressure transmitter or pressure switch
is installed.
To prevent damage on the mechanical seal, the system
should never have an operating pressure lower than
the accumulator pre-charge pressure. Normal rell
period is 25 to 30 days. Refer to chapter 8.5 for the rell
procedure.
7.4 Shut down system
Check if the system can be shut down.
Check if system can be de-pressurized without negatively
affecting the mechanical seal installed in main pump.
System cannot be shut down if the following main pump
conditions occur:
• Main equipment/pump is on hot stand-by
• Main equipment/pump is pressurized
• Main equipment/pump is in operation
NOTE: Always shut down the system according to plant
regulations/end user safety procedures
When below points are checked, the system can be
shut down:
• If a water cooler is installed, stop the cooling water.
• If a force draft air cooler is installed, stop the motor.
• If an external circulation pump is installed, stop the
pump.
• De-pressurize the system.
úWARNING – HIGH PRESSURE: The cooling water
circuit of the 682- 53B system is not protected
against overpressure. If the return line is closed, a
water line could burst. Make sure a pressure relief
valve is installed in the cooling water circuit.
úWARNING – HOT SURFACES: The system and
surrounding surfaces might be hot. Take care
when touching components. Wear the appropriate
Personnel Protection Equipment (PPE), according to
plant regulations.
úWARNING – DANGER CHEMICALS: Dangerous
chemical might be released during removal of the
system. Wear Personal Protective Equipment (PPE).
Follow all safety regulations and Plant regulations.
For removal and maintenance and before (re-)installation,
the complete system must be de-pressurized (and drained
if required).
STOP
STOP
STOP