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Installation
Instructions
Single Outside Pusher Type Seals
Experience In Motion
RA, RA-C, RO, RO-TT,
MRA, and Others
flowserve.com
1 Equipment Check
1.1 Follow plant safety regulations prior to equipment disassembly:
1.1.1 Wear designated personal safety equipment
1.1.2 Isolate equipment and relieve any pressure in the system
1.1.3 Lock out equipment driver and valves
1.1.4 Consult plant Safety Data Sheet (SDS) files for hazardous material regulations
1.2 Disassemble equipment in accordance with the equipment manufacturer’s instructions
to allow access to seal installation area.
1.3 Remove existing sealing arrangement (mechanical seal or otherwise).
Clean seal chamber and shaft thoroughly.
1.4 Inspect surfaces under gaskets to ensure they are free from pits or scratches. Break all sharp
corners on shaft steps, threads, reliefs, shoulders, key ways, etc. over which gasket(s) must
pass and/or seal against.
1.5 Check shaft or sleeve OD, seal chamber bore, seal chamber depth, gland pilot, stud diameter,
stud bolt pattern and distance to first obstruction to ensure they are dimensionally the same
as shown in the seal assembly drawing.
1.6 Check seal assembly drawings for any modifications (reworks) to be made to the equipment
for mechanical seal installation and act accordingly.
1.7 The equipment must be earthed to prevent sparks due to static electricity discharge.
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Shaft runout should be checked against the equipment manufacturer‘s specifications.
Generally, should not exceed 0.05 mm (0.002 inch) TIR (Total Indicator Reading)
at any point along the shaft for ball or roller type bearings.
For sleeve type bearings, refer to manufacturer instructions.
If the equipment is not completely dismantled, verify runout
near seal location.
The above values apply to shaft speeds in the range from
1000 to 3600 RPM. For values above and below, consult your
Flowserve representative. See Figure 1.
Shaft endplay should not exceed 0.25 mm (0.010 inch) TIR,
regardless of thrust bearing type. See Figure 2.
Radial bearing play at seal chamber face should be checked
against the equipment manufacturer’s specifications. Generally
0.05 - 0.10 mm (0.002 - 0.004 inch) will be applicable for ball o
r
roller type bearings. For sleeve or journal type bearings, values
will generally be in the order of 0.10 - 0.15 mm (0.004 - 0.006 inch).
If equipment is found outside the general range, contact the
equipment manufacturer and your Flowserve representative
to verify the equipment’s suitability for the seal.
Seal chamber squareness to the shaft centerline should
be within 0.0005 mm/mm (0.0005 inch/inch) of seal
chamber bore TIR.
Note: make sure that shaft endplay does not affect
the reading. Verify the smoothness of the seal
chamber face for a good gasket joint. See Figure 3.
Concentricity of the shaft to the seal chamber bore or gland
pilot register should be within 0.025 mm per 25 mm shaft
diameter (0.001 inch per 1 inch shaft diameter)
to a maximum of 0.125 mm (0.005 inch) TIR.
See Figure 4.
Figure 4
Figure 3
Figure 1
Figure 2
To first obstruction
Shaft or sleeve OD
+0.000 mm (+0.000 inch)
-0.050 mm (-0.002 inch)
+0.000 mm (+0.000 inch) API 610/682
-0.025 mm (-0.001 inch) DIN/ISO
ASME
Seal housing face to have surface finish
of 1.6 μm (63 μinch) R
a
finish or better.
Gland pilot can be at either
of these register locations.
Seal housing bore to have 3.2 μm
(125 μinch) R
a
finish or better.
Sleeve or shaft finish to be
0.8 μm (32 μinch) R
a
or better.
Surface finish requirements
Figure 5
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Single Outside Seal Installation
2 Single End Suction Vertical Split Case and Vertical In-Line Pumps (1 box)
2.1 Lubricate the shaft or sleeve lightly with silicone lubricant provided with the seal before installing any seal parts.
2.2 Install the rotating face gasket O-ring into the bore of the rotating seal face.
2.3 Engage the rotating assembly consisting of the spring holder, springs, and seal drive with the
rotating face to form the rotating assembly. Be sure any drive pins in the seal drive engage the slots
in the rotating face. Handle PTFE U-cup rings and graphite rotating face gaskets with extreme care.
U-cup rings must be assembled individually and not pushed on the shaft or sleeve while they are part
of the rotating face or rotating assembly. Avoid nicking or pinching either lip on the U-cup rings. Use
both U-cup rings, they work together to form an effective seal.
2.4 Install the rotating seal parts spring holder first onto the shaft or sleeve in the proper sequence with
the face of the rotating face facing the impeller. Use a slight twisting motion for any complete rotary
unit containing O-ring rotating face gaskets. Place rotating assembly unit as close as possible to the
first obstruction, usually the radial bearing.
2.5 Lightly lubricate the O-ring or Duraflex stationary seat gaskets. Where a stationary face has an
O-ring mounting on the shoulder, it is usually better to nest this O-ring in the gland cavity before
installing the face. Other stationary face mountings can be assembled on the stationary face shoulder.
2.6 Press the stationary face into the gland with the sealing face orientated toward the outboard side of
the gland, facing the rotating seal face. Use hand pressure only.
2.7 Position the gland over the shaft or sleeve with the stationary sealing face orientated toward the
rotating face sealing face. Place the gland as close to the rotating assembly as possible. Do not bump
the stationary face against the shaft as it may chip, crack, or break.
2.8 Install the pump back-plate and assemble the pump. Position the gland so the gland or stationary
face pilot is properly engaged and tighten the gland stud nuts up evenly, cross staggering the
adjustment of the nuts. The gland nuts should be torqued to a maximum of 13 N-m (10 ft-lbs).
Excessive gland nut pressure can result in distortion of the insert. Adjust the bearings, coupling,
and impeller so that the shaft is in its operating axial position. Any subsequent axial adjustment of
the shaft requires resetting of the seal rotary unit.
2.9 Wipe the seal faces clean with alcohol. Seal faces should not be lubricated but should be left clean
and dry.
2.10 Position the rotating assembly so that the seal faces are in contact and position the spring holder so
that the spring gap (or bellows rotary unit length) is that given on the assembly drawing. The spring
gap dimension is also stamped on the spring holder. Tighten the set screws firmly and evenly.
2.11 See paragraph 4, Operational Recommendations before starting pump.
3 Double Suction and Multistage Horizontal Split Case Pumps (2 boxes)
3.1 Lubricate the shaft or sleeve lightly with silicone lubricant provided with the seal before installing any
seal parts.
3.2 Lightly lubricate the O-ring or Duraflex stationary seat gaskets. Where a stationary face has an
O-ring mounting on the shoulder, it is usually better to nest this O-ring in the gland cavity before
installing the face. Other stationary face seat gaskets can be assembled on the stationary face
shoulder.
3.3 Press the stationary face into the gland with the sealing face orientated toward the outboard side of
the gland, facing the rotating face. Use hand pressure only.
3.4 Position the gland over the shaft or sleeve so that the gland or stationary face pilot is properly
engaged and the stationary face sealing face is facing out. Do not bump the stationary face against the
shaft as it may chip, crack, or break. Tighten the gland stud nuts evenly in a diagonal sequence. Do
not over tighten the gland nuts. Excessive gland nut pressure can distort the stationary face.
3.5 Adjust the bearings, coupling, and impeller so that the shaft is in its operating axial position. Any
subsequent axial adjustment of the shaft requires resetting of the seal rotating assembly.
3.6 Install the rotating face gasket O-ring into the bore of the rotating face.
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3.7 Engage the rotating assembly consisting of the spring holder, springs, and seal drive with the rotating
face to form the rotating assembly. Be sure any drive pins in the seal drive ring engage the slots in the
rotating face. This is the complete rotating assembly. Handle PTFE U-cup rings and Durafite rotating face
gaskets with extreme care, PTFE U-cup rings must be assembled individually and not pushed on the
shaft or sleeve while they are part of the rotating face rotating assembly. Avoid nicking or pinching either
lip of the U-cup ring. Use both U-cup rings, they work together to form an effective seal.
3.8 Install the rotating seal component parts on the shaft or sleeve in the proper sequence with the face
of the rotating face facing the sealing face that is in the gland. Use a slight twisting motion for any
complete rotary unit containing O-ring rotating face gasket.
3.9 Wipe the seal faces clean with alcohol. Seal faces should not be lubricated but be left clean and dry.
3.10 Position the rotating assembly so that the seal faces are in contact and position the spring
holder so that the spring gap (or bellows rotary unit length) is that shown on the assembly drawing.
Tighten the set screws firmly and evenly.
3.11 See paragraph 4, Operational Recommendations before starting pump.
Note: Seal designs incorporating a bushing style stationary face do not include a gland. Lubricate the
stuffing box bore and the O-rings with the silicone lubricant provided with the seal. Hand press the
bushing into the bore of the stuffing box. Follow the above procedures for installation of the rotating
seal components.
4 Operational Recommendations
4.1 Do not start up the equipment dry. Vent air from the casing of the pump and the stuffing box before
start-up. Circulate clean product or a clean fluid from an external source through the stuffing
box whenever the equipment is in operation, Plan 11 or 32.
4.2 If the seal runs hot, check for proper seal setting, seal housing dimensions, and check the bypass or
flush line for obstructions. Do not allow the equipment to run for any extended time if the seal gets
hot or squeals. For special problems encountered during installation, contact your nearest Flowserve
Sales and Service Representative or Authorized Distributor.
5 Repair
This product is a precision sealing device. The design and dimension tolerances are critical to seal performance.
Only parts supplied by Flowserve should be used to repair a seal. To order replacement parts, refer to the part code
and B/M number. A spare backup seal should be stocked to reduce repair time.
When seals are returned to Flowserve for repair, decontaminate the seal assembly and include an order
marked "Repair or Replace." A signed certificate of decontamination must be attached. A Safety Data
Sheet (SDS) must be enclosed for any product that came in contact with the seal. The seal assembly will be
inspected and, if repairable, it will be rebuilt, tested, and returned.
FIS116eng REV 09/2018 Printed in USA
To find your local Flowserve representative and find out more about Flowserve Corporation,
visit www.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.
© 2015 Flowserve Corporation
TO REORDER REFER TO
B/M #
F.O
.
USA and Canada
Kalamazoo, Michigan USA
Telephone: 1 269 381 2650
Telefax: 1 269 382 8726
Europe, Middle East, Africa
Etten-Leur, the Netherlands
Telephone: 31 765 028 200
Telefax: 31 765 028 487
USA and Canada
Kalamazoo, Michigan USA
Telephone: 1 269 381 2650
Telefax: 1 269 382 8726
Europe, Middle East, Africa
Etten-Leur, the Netherlands
Telephone: 31 765 028 200
Telefax: 31 765 028 487
Asia Pacific
Singapore
Telephone: 65 6544 6800
Telefax: 65 6214 0541
Latin America
Mexico City
Telephone: 52 55 5567 7170
Telefax: 52 55 5567 4224
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