Flowserve NX0500SA-STD Owner's manual

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Installation, Operation, & Maintenance Manual
NX Seal Cooler
®

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1. INTRODUCTION
1.1 About this Manual
This manual is intended to ensure a safe installation and operation of the NX seal-
cooler. All involved personnel shall be noticed of this instruction.
Note: Pressure equipment shall be operated with caution. Due to changed or
unforeseen circumstances and conditions, dangerous/ hazardous events can
occur.
Before installation the following shall be checked:
• Any possible damage due to transport or storage
• Cleanliness, required before operation
• Existence of the nameplate with correct inspection markings and design/
test conditions
1.2 How to Use this Manual
Only trained and qualified personnel should use this manual. Refer to section 2.3.
Inexperienced personnel should only work on this system under the supervision
of a qualified 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 5,
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 assembly drawings.
1.4 Conformity with Standards and Directives
The information in this manual conforms to the following standards and direc-
tives:
• PED 2014/68/EU

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1.5 Use of Alerts and Icons
This manual uses “Notes”, “Cautions”, and “Warnings” to alert you of important
information and/or hazardous situations.
CAUTION
The equipment, product or surrounding area can be damaged if the
“caution” is not obeyed.
WARNING
Personnel can be (seriously) injured, or the equipment can be seri-
ously damaged if the “warning” is not obeyed.
The above icons are the general icons that are used for “Cautions” and “Warn-
ings”. More specific icons are also used, depending on the type of hazard.
2. SAFETY
2.1 Hazards associated with the NX seal cooler
The following hazards can be present in the system:
• High pressure
• Dangerous chemicals
• Temperature (hot surfaces)
• Dangerous moving parts (during installation)
Notes:
• The cooler maximum surface temperature may comply with the ATEX
temperature class when applicable.
• Supply of cooling water shall be guaranteed for heat removal of hot
products.
WARNING
HIGH PRESSURE: The cooling water line of the system is not pro-
tected 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 line.
If the system has any external leaks, you must stop the system immediately and
repair the leak.

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2.2 General Safety
When installing, operating and maintaining this system, pay particular attention to
safety:
• Obey all applicable safety laws and regulations.
• Obey all Plant regulations.
• Make sure that only trained and qualified personnel work on the system.
Refer to section 2.3.
• Read and understand each part of this manual.
• Follow the installation, operation, and maintenance procedures exactly.
• Wear the relevant Personal Protective Equipment (PPE). Refer to section 2.4.
• Never work alone if there is a possibility of an accident.
• Make sure that adequate safety equipment is installed in and around
the work area: first aid kits, safety showers (if applicable), fire extin-
guishers, escape routes, shut off valves, etc.
• Make sure that personnel are fully trained on how to use the safety
equipment. A qualified first aid specialist must always be available for
each shift.
• Read the Plant requirements for handling hazardous materials
2.3 Trained and Qualified Personnel
Qualified 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 qualification of
personnel:
• Appropriate training
• Relevant experience
• Knowledge of relevant standards and specifications
• Knowledge of accident prevention regulations
• Knowledge of plant regulations and operating conditions
2.4 Personal Protective Equipment (PPE)
When operating or maintaining this system, make sure you wear the appropriate
Personal Protective Equipment (PPE): protective clothing, gloves, safety glasses,
etc.
WARNING
HOT SURFACES: The system and surrounding surfaces might be hot.
Take care when touching components. Wear the appropriate Person-
nel Protection Equipment (PPE), according to plant regulations

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3. ENVIRONMENTAL CONSIDERATIONS
CAUTION
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 system must be
disposed of according to local environment laws and regulations.
3.2 End of Life Equipment
WARNING
DANGER CHEMICALS: Dangerous chemical might be released during
removal of the system. Wear Personal Protective Equipment (PPE).
Follow all safety regulations and Plant regulations.
WARNING
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.
4. TRANSPORTATION AND STORAGE REQUIREMENTS
The following requirements apply to the NX seal cooler and all related equipment:
Transport and storage criteria Requirements
Transportation The system must be transported and stored in the un-
opened, original shipping box.
Suspect damaged during trans-
portation
Systems that have been dropped, or have been subjected
to heavy impacts, during transport must not be installed.
An inspection in that case is strongly recommended.
Warehouse requirements The warehouse must be dry and dust free. The system
should not be exposed to: large temperature fluctuations,
high humidity, or radiation
Long-term storage After a storage period of 1 year, the system must be
inspected for its “as new” properties.
Preserving installed systems The preserving medium must not damage the installed
system, for example by fouling or attacking the com-
ponents and mechanical seal. If you are not sure which
preserving medium to use, contact Flowserve.

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5. DESIGN OVERVIEW
5.1 Description
The Flowserve NX seal cooler is a shell and tube system used with single or dual
mechanical seals. It utilizes a counter flow pattern to enhance cooling efficiencies.
The objective of the seal cooler is to lower the temperature of process or barrier fluid
passing through the coil while cooling water passes through the case. It is designed
for installations close to the seal where space is limited.
Figure 1: Vertical Cross Sectional View
BODY
(OUTER CASING)
Vent/Drain
tube
in
Shell
In
Vent/Drain
Tube
Out
Fittings
Mounting
Plate
Coil
Coil
Separator
Body
(Inner Casing)
End Plate
(Top)
End Plate
(Bottom)
Body
(Outer Casing)
Vent/Drain
Figure 2: Top View
Shell
Out
Note: The images of parts shown in these instructions may differ visually from the
actual parts due to manufacturing processes that do not affect the part function or
quality.

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6. INSTALLATION
Before installing the system, inspect all components for damage. If any of the com-
ponents are damaged, you should report this to your local Flowserve representative.
Position the NX seal cooler as close to the seal as possible. Make sure there is suf-
ficient 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.
WARNING
CRUSH HAZARD. Possible injury and/or trapped limbs. Take care to
avoid being trapped or crushed between heavy, moving objects.
6.1 Primary API Piping Plans
API Plan 21 provides cooling to the seal by flowing pump discharge fluid through a
control orifice and into the seal cooler before entering the seal chamber. This piping
plan is targeted for clean high temperature fluids and hot water above 176°F (80°C)
to improve vapor margins, meet secondary seal element temperature limits, reduce
coking, and improve fluid lubricity.
API Plan 23 cools the seal chamber fluid by using a pumping device to circulate the
seal chamber fluid through a seal cooler and back to the seal chamber. The circulated
fluid is isolated from the pump impeller area by a throat bushing so that the seal
cooler needs to cool only a small volume of fluid in the seal chamber heated by the
seal faces and heat soak from the process side. This piping arrangement is the plan
of choice for clean hot water services, particularly above 176°F (80°C) where water
has low lubricity, and many clean hot hydrocarbons to improve vapor margins.

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6.2 Mounting Positions
The seal cooler can be mounted vertically or horizontally, and as close to the seal
as possible. Vertical mounting is preferred for any closed loop system for venting
purposes.
In a horizontal position It is difficult to vent gas/air from a horizontal installation
because the gas/air can become trapped within the upper turns of the cooling coil. A
series of flush and bleed steps might be necessary in order to remove these trapped
gases. See figure 5 below.
The presence of trapped gas/air is more critical when using a Plan 23 seal flush or any
closed loop system. Trapped gases that are entrained in the sealing fluid can collect in
the seal cavity thus impede flow to the seal cooler. This can ultimately cause the seal
to overheat and fail due to a lack of lubrication.
It is strongly recommended that the seal cooler be mounted in a vertical position with
process fluid connections on top whenever possible to ensure thorough venting and
promote cooling efficiencies.
Figure 3: API Plan 21 Configuration Figure 4: API Plan 23 Configuration
Liquid Gas/Air
Entrapment Process
Inlet
Process
Outlet

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7. OPERATION
Only operate the NX cooler within the temperature and pressure limits shown on the
assembly drawing
When installing, ensure that the seal cooler, piping, and vent locations provide com-
plete venting of gas/air from both the coil and case systems. This requires the vents
to be located at the highest point in each system.
Before start-up, ensure that all piping is properly attached to the appropriate connec-
tions for both the coil and case systems to prevent fluid leaks and achieve expected
cooler efficiencies.
Before start-up, ensure that all the gas/air is vented from both the coil and shell sys-
tems to provide the system efficiencies expected and prevent a vapor lock condition.
At start-up, ensure that the flush fluid flow and coolant fluid flow are set and stabilized
at the prescribed flow rates determined for the application.
Do not allow the case system coolant fluid flow rate to be operated below minimum
flow rates. Lower flow rates will encourage fouling which reduces the seal cooler heat
transfer capabilities. See table below for minimum required case side flow rate
Cooler size .500 .625 .750
Minimum Coolant Flow 2.5 GPM
[9.5 LPM]
3 GPM
[11.4 LPM]
6.5 GPM
[24.6 LPM]
Table 1: Minimum Case Side Flow Rate.
Seal cooler performance should be monitored periodically. Baseline temperatures
should be gathered soon after equipment commissioning. Target case side base line
temperature differential should be 11°C (20°F) or lower. Exceeding this differential
temperature could result in a reduction of heat transfer and shell side fouling.
Note: For pressure and temperature limits, see the drawing included with the NX seal
cooler.
Periodically, shell and tube side temperature differential should be monitored. With no
change in process temperature and flow rate, coil side outlet temperature should not
exceed 5.5 - 11°C (10-20°F) rise from base line. With no change in cooling fluid tem-
perature and flow rate, case side differential temperature should not vary significantly
from base line reading. A variation of 5.5 - 11°C (10-20°F) from base line indicates
loss of heat transfer. Case side fouling could be a cause and cooler cleaning should
be considered.

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8. MAINTENANCE
The NX seal cooler may only be disconnected by qualified personnel, in accordance
with national regulations, the safety standards of the user and in accordance with the
users operating procedures.
Before disconnecting the equipment, verify that:
• The equipment is at ambient temperature
• The equipment is not pressurized
• The equipment is drained
Process fluid may remain in tubes, Removal of remaining fluid to adhere to site policy.
WARNING
DANGER CHEMICALS: Dangerous chemical might be released during
removal of the system. Wear Personal Protective Equipment (PPE).
Follow all safety regulations and Plant regulations.
8.1 Remove the seal cooler from service.
8.2 Remove all end fittings connected to the lengths of tubing protruding from the
top of the cooler. Fitting ferrules and nuts cannot be removed from the primary
lengths of protruding coil and should be remain in place. Do not remove the fit-
tings directly adjacent to the top end plate. Be sure to retain all fittings and mark
them appropriately. This will minimize the likelihood of fitting leaks upon reas-
sembly.
8.3 Remove the center bolt.
8.4 Carefully pry each end plate from the main cooler body. A 5/16” eye bolt can be
inserted into each end plate to offer an adequate amount of leverage. Take care
not to use too much force, which can result in coil stretch. The outer and inner
cases can now be removed, which will expose the coiled tubing.
8.5 Clean the case and coils taking care not to damage either.
8.6 Inspect all components for damage or corrosion and replace as needed. Second-
ary sealing components such as O-rings should always be replaced.
8.7 Reassemble the unit in reverse of disassembly. Center bolt torque required is
110 lbf-ft (149 N-m) for 3/4" bolt and 250 lbf-ft (338 N-m) for 1” bolt. All fittings
should be reassembled to the manufacturer’s specifications.

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9. APPENDIX
Cooler Drawing Number BOM
0.500 inch Standard NX0500SA-STD NX0500SA
0.625 inch Standard NX0625SA-STD NX0625SA
0.750 inch Standard NX0750SA-STD NX0750SA
0.750 inch PED NX0750SA-PED NX0750SA-P
8.8 Leak testing is recommended after assembly. Refer to end user specifications or
procedures. Alternately, individual units can be returned to Flowserve for refur-
bishment and testing.
8.9 The inspection should include the following hold points as a minimum:
• Visual inspection of the interior and exterior of the system on corrosion,
erosion, damages and cracking
• Random check of the wall thickness and verification against the design
thickness
• Random checking of coating (when applicable)
Maintenance of the seal cooler shall be limited to touch-up of coating and cleaning
methods that do not affect the mechanical integrity of the system.
Under no circumstances should the seal cooler be opened while it still contains any
hazardous materials or when the internal pressure is above the local atmospheric
pressure. Before opening the equipment it must be brought to atmospheric pressure
by venting it to a safe location.

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To find your local Flowserve representative
and find out more about Flowserve Corporation,
visit www.flowserve.com
FIS233eng REV 01/19 Printed in USA
flowserve.com
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly
selected, this Flowserve product is designed to perform its intended function safely during its useful life. However,
the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous
applications under a wide variety of industrial service conditions. Although Flowserve can provide general guidelines,
it cannot provide specific data and warnings for all possible applications. The purchaser/user must therefore assume
the ultimate responsibility for the proper sizing and selection, installation, operation, and maintenance of Flowserve
products. The purchaser/user should read and understand the Installation Instructions included with the product, and
train its employees and contractors in the safe use of Flowserve products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for
informative purposes only and should not be considered certified or as a guarantee of satisfactory results by reliance
thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any
matter with respect to this product. Because Flowserve is continually improving and upgrading its product design,
the specifications, dimensions and information contained herein are subject to change without notice. Should any
question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any one of
its worldwide operations or offices.
USA and Canada
Kalamazoo, Michigan USA
Telephone: [phone]
Telefax: 1 269 382 8726
Europe, Middle East, Africa
Etten-Leur, the Netherlands
Telephone: [phone]
Telefax: 31 765 028 487
Asia Pacific
Singapore
Telephone: [phone]
Telefax: 65 6214 0541
Latin America
Mexico City
Telephone: [phone]
Telefax: 52 55 5567 4224