682 Seal Cooler
Experience In Motion
New generation seal cooler to meet and
exceed the seal cooler requirements stated
in the 4th Edition of API Standard 682
Installation
Operation
Maintenance
Description
The 682 Seal Cooler was designed as a new generation seal cooler to meet and
exceed the seal cooler requirements stated in the First Edition of API Standard
682. These requirements address the primary specications of the seal coolers that should be used in conjunction with mechanical seals. A secondary goal
was to eliminate the fouling and corrosion problems inherent with typical seal
cooler designs. With release of the Fourth Edition of API Standard 682, the
requirements for this size of seal cooler are basically the same except that the
cooling coil material must now be 316 instead of 304. The standard material has
been upgraded to 316, allowing the 682 Seal Cooler to continue meeting the
requirements of API Standard 682. The following is a brief summary of the major
requirements specied for Fourth Edition “Seal Flush Coolers”:
• Seal ush coolers should not be sized for less than a 8 l / min (2 gpm)
ush ow per seal.
• The seal ush uid should be on the tube side and the cooling water on
the shell side.
• When required, seal ush coolers should be designed, fabricated, and
inspected according to ASME B31.3 using piping components.
• The tubes should be ¾ inch diameter with 0.095 inch minimum wall
thickness.
• The tubes should be 316 austenitic stainless steel and the shell should
be carbon steel.
• The seal cooler should allow complete draining and venting of both the
water and process sides.
• Meets and exceeds API Standard 682 design requirements.
Design Features Figure 1
cover
outer shell
tting
The images of parts shown in these instructions may differ visually from the actual
2
parts due to manufacturing processes that do not affect the part function or quality.
inner shell
bafebafebafe
cover
inner cooling
coil tubing
outer cooling
coil tubing
• Contains 300 Series Stainless Steel for all wetted parts to provide superior
corrosion resistance.
• Disassembles Easily without damaging the cooling coils for cleaning to
prevent scaling and cooler fouling from reducing operating efciencies.
• Contains Seamless Cooling Coil Tubing separated by bafes that channel
the cooling water ow to prevent it from bypassing any of the cooling coils
and to provide the highest efciency.
• Allows Complete Drainage and Venting of both the tube and shell side uids
to prevent vapor lock conditions and ensure the highest efciency.
• Can be congured for Series or Parallel Tube Flow to provide the cooling
characteristics needed.
• Available with an ASME Section VIII, Division 1 “U” Stamp for applications
where the equipment must be rated and veried as meeting the ASME
design requirements for pressure vessels.
• Provides Explosion Resistance through a pressure relief feature that
prevents the internal pressure from exceeding the allowable working
pressure of the inner and outer shells.
Product Specications
Standard Materials:
• O-rings Fluoroelastomer
• Tubing 316 Stainless Steel
• Fittings 316 Stainless Steel
• Shell and Covers 304 Stainless Steel
Technical Data:
• Cooling Coil Tube OD 19 mm (0.750 inch)
• Cooling Coil Tube Wall Thickness 2.4 mm (0.095 inch)
• Effective Cooling Area 0.51 m 2 (5.50 ft 2)
• Shell (Coolant) Flow Rate 24.6 to 75.7 l / min (6.5 to 20 gpm)
• Tube (Product) Flow Rate 7.6 to 37.9 l / min (2 to 10 gpm)
• Unit Weight (Empty) 62.1 kg (137 lbs)
• Maximum Temperature (Tube Side) 371°C (700°F )
• Maximum Temperature (Shell Side) 93°C (200°F), Canada 65°C (200°F)
• Max. Working Pressure (Tube Side) 255 Bar @ 371°C
(3,700 psig @ 700°F)
• Max. Working Pressure ( Shell Side ) 14.5 Bar @ 93°C (210 psig @ 200°F)
3
Standard Model Numbers:
• Series Tube Flow: A2R21431-01 (Base) / A2R21431-06
• Parallel Tube Flow: A2R23812-01 (Base) / A2R23812-06
1 Installation
1.1 Primary Piping Plans
Plan 21 - Seal Flush Plan 21 provides cooling to the seal with high ush
ow rate capabilities by recirculating pump discharge uid
through a ow control orice and a seal cooler before it enters
the seal chamber. Because the circulated uid returns to the
pump suction and must be re-pumped to discharge on each
pass, the seal cooler is typically piped for Series or Multiple
Pass Tube Flow to maximize heat transfer capability for
continually removing both process uid and seal generated
heat. This piping plan is targeted for clean high temperature
uids and hot water under 80°C (176°F) to improve vapor
margins, meet secondary seal element temperature limits,
reduce coking and polymerizing, and/or improve uid lubricity.
Plan 23 - Seal Flush Plan 23 cools the seal chamber uid by using a
pumping device to circulate the seal chamber uid out through
a seal cooler and back to the seal chamber. With the need to
minimize head loss or pressure drop through this recirculation
system, the seal cooler is typically piped for Parallel or Single
Pass Tube Flow. The circulated uid is isolated from the pump
impeller area by a throat bushing so that the seal cooler
needs to cool only the seal chamber uid heated by seal
generated heat and heat soak from the process side.
This piping arrangement is the plan of choice for clean hot
water services, particularly above 80°C (176°F) where water
has low lubricity, and many clean hot hydrocarbons to improve
vapor margins.
4
A 682 Seal Cooler piped for series tube ow is shown in Figure 2 and a 682 Seal
Cooler piped for parallel tube ow is shown in Figure 3. Both Figure 2 and Figure
3 show the 682 Seal Cooler mounted either vertically as preferred or horizontally
as may be required by some applications.
Series Tube Flow Piping Figure 2
Vertical Mount
(preferred)
cooling
water out
cooling
product
drain
cooling
water in
cooling
water in
Horizontal Mount
product
drain
product
vent
cooling
water out
product
vent
0.45 to 0.60 m
(1.5 to 2.0 feet)
0.9 m (3.0 feet)
Maximum
Parallel Tube Flow Piping Figure 3
cooling
water out
Vertical Mount
(preferred)
product
vent
cooling
water out
Horizontal Mount
product
drain
product
vent
cooling
water in
0.45 to 0.60 m
(1.5 to 2.0 feet)
0.9 m (3.0 feet)
Maximum
cooling
product
drain
cooling
water in
5
1.2 Vertical or Horizontal Mounting
Even though the 682 Seal Cooler can provide cooling capabilities when it
is mounted horizontally, it is much more advantageous to mount this seal
cooler vertically. In a vertical position, the cooling coil tubing winds gradually downward and upward for optimum uid drainage and gas/air venting.
Vertical
tube side
gas vents
in shell
Horizontal
trapped gas
in tubing
tube
side uid
drains
shell side
gas vents
(in cover)
tube side
gas vent
cooling
water
drains
(in cover)
trapped gas
tube side
uid drains
In a horizontal position, it is much more difcult to totally drain both the
sealing and cooling uids. The sealing uid becomes trapped within the
lower turns of the cooling coil and the shell side cooling water becomes
trapped below the lowest drainage point. The seal cooler would need to
be removed and positioned vertically to achieve total drainage. It is also
much more difcult 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 ush and bleed steps might be necessary in order to remove
these trapped gases.
The presence of trapped gas/air is more critical when using a Plan 23
seal ush. Trapped gases that become entrained in the sealing uid can
reduce the seal cooler efciency and ow in the seal ush circuit. This can
ultimately cause the seal to overheat and fail due to a lack of lubrication. A
vertically mounted seal cooler provides the advantage of a thermosyphon
effect which is lacking with horizontal installations to help alleviate these
potentially detrimental conditions.
6
It is strongly recommended that the 682 Seal Cooler be mounted in a
vertical position whenever possible for a Plan 23 to ensure proper cooling
efciencies and simplify maintenance requirements. For applications that
must conform to API Standard 682 requirements, the API Standard 682
species that the seal cooler must be mounted to allow complete draining
and venting of both the cooling water and the process uid. Vertical
installations achieve this capability but horizontal mountings do not.
2 Operation
2.1 When installing and again before start-up, ensure that the seal cooler,
piping, and vent locations provide complete venting of gas/air from both
the tube and shell systems. This requires the vents to be located at the
highest point in each system.
2.2 Before start-up, ensure that all the gas/air is vented from both the tube
and shell systems to provide the system efciencies expected and prevent
a vapor lock condition.
2.3 When installing and again before start-up, ensure that the seal cooler,
piping, and drain locations allow for drainage of uid from both the tube
and shell systems. This requires the drains to be located at the lowest
point in each system. A drain valve (not just a plug) should be mounted
in the shell system.
2.4 If the tube and shell systems can not be congured for both proper venting
and proper draining, as with a horizontal installation, it is more important
for proper venting be achieved.
2.5 Before start-up, ensure that all piping is properly attached to the appropri-
ate connections for both the tube and shell systems to prevent uid leaks
and achieve expected cooler efciencies.
2.6 At start-up, ensure that the ush uid ow and cooling uid ow are set
and stabilized at the prescribed ow rates determined for the application.
2.7 Do not allow the shell system cooling uid ow rate to be operated below
24.6 L / min (6.5 gpm). Lower ow rates will encourage fouling which
reduces the seal cooler heat transfer capabilities.
2.8 Cooler performance should be monitored periodically. Baseline tempera-
tures should be gathered soon after equipment commissioning. Target
shell side base line temperature differential should be 20°F or lower.
Exceeding this temperature could result in a loss of efciency and possibly
result in shell side fouling.
2.9 Periodically shell and tube side temperature differential should be
monitored. With no change in process temperature tube side
temperatures should be not exceed 10-20°F rise from base line.
Shell side differential exceeding 20°F or signicant variation from base
line indicates loss of efciency. Shell side fouling could be a cause and
cooler cleaning should be considered.
7
TO REORDER REFER TO
flowserve.com
B/M #
F.O .
3 Maintenance
3.0 Remove the seal cooler from service.
3.1 Remove all end ttings connected to the lengths of tubing protruding from each end
of the cooler. Fitting ferrules and nuts cannot be removed from the primary lengths
of protruding tube and should be remain in place. Do not remove the ttings directly
adjacent to the tube cover. Be sure to retain all ttings and mark them appropriately.
This will minimize the likelihood of tting leaks upon reassembly.
3.2 Remove the center bolt.
3.3 Remove each of the four snap rings located near each tube to end cover tting.
3.4 Carefully pry each end cover from the main cooler body. A short piece of pipe
(6 or 8 inch) screwed into the shell side inlet or outlet offers an adequate amount of
leverage. Take care not to use too much force, which can result in coil stretch. The
outer and inner shells can now be removed, which will expose the coiled tubing.
3.5 Remove the sheet metal bafes located at the tube body OD and ID. Orientation is
important and should be recorded.
3.6 Clean the shell and coils taking care not to damage either.
3.7 Inspect all components for damage or corrosion and replace as needed. Secondary
sealing components such as O-rings should always be replaced.
3.8 Reassemble the unit in reverse of disassembly. Center bolt torque required is
100 to 150 ft-lbf. All ttings should be reassembled to the manufacturer’s specications.
3.9 Leak testing is recommended after assembly. Refer to end user specications or
procedures. Alternately, individual units can be returned to Flowserve for
refurbishment and testing.
FIS221eng ORG 10/13 Printed in USA
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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
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the specifications, dimensions and information contained herein are subject to change without notice. Should any
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