Experience In Motion
Dual Pressurized Seals
Dual RO, RO-TT, PTO, PT, RO-PTT,
BRO, BRT, MRO, MRT, and other
component seals
Installation
Instructions
1 Equipment Check
To first obstruction
Face of seal housing to be square to the axis
of the shaft to within 0.013 mm per millimeter
(0.0005 inches) of seal chamber bore FIM and
have a √1.6
μm (63 μinch) R finish or better
a
Gland pilot can be at either of these
register locations, concentric to within
0.13 mm (0.005 inch) FIM of shaft or sleeve OD
Sleeve or shaft finish to be
0.8 μm (32 μinch) R or better
a
Scribe
Mark A
Shaft or sleeve OD
+0.000 mm (+0.000 inch)
-0.050 mm (-0.002 inch) ANSI
+0.000 mm (+0.000 inch) API 610/682
-0.025 mm (-0.001 inch) DIN/ISO
• Bearings must be in good condition
• Maximum lateral or axial movement of shaft (end play) = 0.25 mm (0.010 inch) FIM
• Maximum shaft runout at face of seal housing = 0.05 mm (0.002 inch) FIM
• Maximum dynamic shaft deflection at seal housing = 0.05 mm (0.002 inch) FIM
Scribe
Mark B
Seal housing bore to have √3.2 μm
(125 μinch) R finish or better
a
1.1 Follow plant safety regulations:
• lock out motor and valves.
• wear designated personal safety equipment.
• relieve any pressure in system.
• consult plant MSDS les for hazardous material regulations.
1.2 Adjust the bearings, coupling, and impeller so that the shaft is in its operating
axial position. Disassemble equipment to allow access to seal installation area.
1.3 Remove all burrs and sharp edges from the shaft and sleeve including sharp edges
of keyways and threads. Replace worn shaft or sleeve. Make sure the seal housing
bore, face, and sealing uid ush taps are clean and free of burrs and sharp edges
than might damage O-rings, V-rings, or Duraex rings.
Seal Chamber Requirements Figure 1
1.4 Check requirements for shaft, sleeve, and seal housing. See Figure 1.
1.5 Check assembly drawing included with the dual seal for specic seal design,
materials of construction, dimensions, and piping connections.
1.6 CheckshaftorsleeveOD,boxdepth,boxbore,anddistancetotherst
obstruction to ensure that they are dimensionally the same as shown on the seal
2
assembly drawing.
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.
1.7 Check gland pilot and bolt holes to ensure they are adaptable to the equipment
and are the same as shown on the assembly drawing.
1.8 Handle all seal parts with care, they are manufactured to precise tolerances.
The sealing faces are of special importance and are lapped at to within three
light bands (34.8 millionths of an inch). Keep the seal faces perfectly clean
at all times.
Dual Seal Installation
2 Single End Suction Vertical Split Case and
Vertical In-Line Pumps (1 seal chamber)
2.1 Scribe Mark A on the shaft or sleeve at the face of the seal housing,
Figure 1. Refer to the assembly drawing provided with the seal for the seal setting
dimensions. Scribe Mark B, Figure 1, at this dimension from Scribe Mark A.
(See Section 4 for ball drive designs).
2.2 Lubricate one of the two stationary face mounting O-rings or Duraex rings
with the silicone lubricate provided with the seal and nest this O-ring in the
gland cavity. Press the outer stationary face into the gland with the sealing
surface orientated toward the inboard side of the gland. Use hand pressure only.
Position the gland over the shaft or sleeve with the stationary face sealing surface
orientated toward the seal chamber (stufng box). Place the gland as close to the
bearing bracket as possible. Do not bump the stationary face against the shaft as it
may chip, crack, or break.
2.2 Lubricate the shaft or sleeve with the silicone lubricant provided.
2.3 Install the rotating seal assembly on the shaft or sleeve:
• Outer rotating face with rotating face gasket O-ring, V-ring, or Duraon wedge.
• Seal assembly.
• Inner rotating face with rotating face gasket O-ring, V-ring, or Duraon wedge.
The rotating face sealing surfaces should be facing away from the springs and
toward the stationary faces. Be sure that the seal drive pins engage the drive slots
in the rotating faces.
The RO, PTO, and similar designs have buttoned seal assemblies that can most
easily be installed on the shaft or sleeve as a unit with the rotating face gasket
O-rings in place in the bore of the rotating faces. The BRO, MRO, and similar
designs are generally larger in diameter and the rotating seal parts are most
easily installed as individual components.
Handle Duraon V-rings, wedge rings, Durate, and Duraex with extreme care.
Duraon V-rings must be assembled individually and not pushed on the shaft or
sleeve while they are part of the rotating face or rotating seal assembly. Avoid
nicking or pinching either lip of the V-ring. Use both V-rings, they work together
to form an effective seal.
3
Position the rotating seal assembly in its nal axial position with the indicated
position of the seal drive lined up with Scribe Mark B. Tighten the seal drive set
screws rmly and evenly.
2.4 Lubricate the seal chamber bore with the lubricant provided. The seal chamber
is usually the stufng box contained in the pump back plate.
2.5 Lubricate the other stationary face gasket O-ring and place it on the back
shoulder of the inner stationary face. Slide the inner stationary face with the
O-ring into position at the bottom of the chamber. The rubbing or sealing surface
of the inner stationary face should face out, away from the impeller.
2.6 Wipe the seal faces clean with alcohol. Seal faces should not be lubricated but
should be left clean and dry.
2.7 Install the seal chamber (pump back-plate) and assemble the pump.
Position the gland to the face of the seal housing. Be sure the gland pilot
is properly engaged. Tighten the gland stud nuts evenly, cross stagger the
adjustment of the nuts. Follow the equipment manufacturer's recommendations for
gland stud nut torque. In the absence of recommendations, gland nuts should only
be torqued to establish a leak tight seal at the gasket. Proper gland bolt adjustment
is especially important with a clamp style stationary face where excessive torque
may damage the face.
2.8 See Section 5, Operational Recommendations, before starting pump.
3 Double Suction and Multistage Horizontal Split Case Pumps
(2 seal chambers)
Note: The parting gasket between the upper and lower sections of the pump casing
mustbeush with the seal chamber bore and face or leakage will occur past the O-rings
and gaskets.
3.1 Scribe Mark A on the shaft or sleeve at the face of the seal housing, Figure 1.
Refer to the assembly drawing provided with the seal for the seal collar dimension
setting shown in a box . Scribe Mark B, Figure 1, at this dimension from Scribe
Mark A. (See Section 4 for ball drive designs).
3.2 Lubricate the seal chamber bore with the lubricant provided. The seal chambers
are usually the stufng boxes, located near the bearing brackets.
3.3 Lubricate one of the stationary face mountings and place it on the back
shoulder of the inner stationary face. Slide the inner stationary face with the
O-ring into position at the bottom of the chamber. The rubbing or sealing surface
of the inner stationary face should face out, away from the pump impeller.
3.4 Wipe the seal faces clean with alcohol. Seal faces should not be lubricated but
should be left clean and dry.
3.5 Lubricate the shaft or sleeve and rotating gasket O-ring with the silicone
lubricant provided.
4
3.6 Install the rotating seal assembly on the shaft or sleeve:
• Inner rotating face with rotating face gasket O-ring, V-ring, or Duraon wedge.
• Seal assembly.
•OuterrotatingfacewithrotatingfacegasketO-ring, V-ring, or Duraon
wedge.
The rotating face sealing or rubbing surfaces should be facing away from the
springs and toward the stationary face. Be sure that the seal drive ring drive pins
engage the drive slots in the seal rings.
The RO, PTO, and similar designs have unitized seal assemblies, they can most
easily be installed on the shaft or sleeve as a unit with the rotating face gasket O-
rings in place in the bore of the rotating face. The BRO, MRO, and similar designs
are generally larger in diameter and the rotating seal parts are most easily installed
as individual components.
Handle Duraon V-rings, wedge rings, Durate, and Duraex with extreme care.
Duraon V-rings must be assembled individually and not pushed on the shaft or
sleeve while they are part of the rotating face or rotating seal assembly. Avoid
nicking or pinching either lip of the V-ring. Use both V-rings, they work together to
form an effective seal.
Position the rotating seal assembly in its nal axial position with the indicated
position of the seal drive lined up with Scribe Mark B. Tighten the seal drive set
screws rmly and evenly.
3.7 Lubricate the other stationary face gasket O-ring or Duraex ring with the
silicone lubricate provided and nest this O-ring in the gland cavity. Press the
outer stationary face into the gland with the sealing surface orientated toward
the inboard side of the gland. Use hand pressure only.
3.8 Position the gland over the shaft or sleeve with the stationary face sealing surface
orientated toward the seal chamber (stufng box) and the gland or stationary pilot
properly engaged. Do not bump the stationary face against the shaft as it may chip,
crack, or break. Tighten the gland stud nuts evenly, cross stagger the adjustment
of the nuts. Follow the equipment manufacturer's recommendations for gland
stud nut torque. In the absence of recommendations, gland nuts should only be
torqued to establish a leak tight seal at the gasket. Proper gland bolt adjustment is
especially important with clamp style stationary faces where excessive torque may
damage the face.
3.9 Reassemble the pump.
3.10 See Section 5, Operational Recommendations, before starting pump.
5
4 Ball Drive Seal Designs
The drive ball replaces the set screws in the seal drive and provides the following features:
• It compensates for axial shaft adjustment to reset the impeller
• It compensates for axial shaft movement due to thermal expansion or mechanical
loading of the equipment.
• It provides for positive seal drive without the use of seal setting dimensions.
4.1 Follow the instructions in Section 2 or 3, Scribe Mark A or B are unnecessary.
4.2 Slide the rotating seal assembly down the shaft or sleeve until the predrilled
indentation in the shaft or sleeve is directly under the spring gap. Insert the ball
into the predrilled indentation. See Figure 2.
Figure 2
4.3 Slide the rotating seal assembly forward to connetheball in the seal drive slot.
See Figure 3.
Figure 3
4.4 Complete the seal and pump assembly as instructed in Sections 2 and 3.
6
5 Operational Recommendations
seal
end view
seal
end view
See Figure 4 for a suggested sealing uid supply system for Dual Pressurized Seal
designs. For other systems using Supply Tanks or Circulators refer to the tank or circulator
instructions or contact Flowserve.
5.1 The Dual Pressurized Seal requires a constant supply of a clean barrier uid.
Whenever the equipment is in operation circulatecleanbarrieruid from a
reliable external source between the seals in the seal chamber. Always start up
thebarrieruidsupplysystem before starting the equipment. Maintain the uid
pressure between the seals at least 103 kPa (15 psig) greater than the maximum
pressure of the pumped product acting on the inner seal. Figure 4 shows Plan 53
with a pressurized supply tank and Plan 54 with an external support system.
Do not exceed the pressure-velocity (P-V) limits of the seal, see the pressure-
velocity curves for this seal.
Recommended Barrier Supply System for Dual Pressurized Seals
Figure 4
Plan 53A
Plan 54
5.2 Do not start up the equipment dry. Vent air from the casing of the pump and the
seal chamber before startup.
5.3 If the seal runs hot or squeals, check the seal housing dimensions to ensure that
the seal is not over-compressed and inspect the barrier uid supply system. 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
Representative or Authorized Distributor.
7
TO REORDER REFER TO
flowserve.com
USA and Canada
Kalamazoo, Michigan USA
Telephone: 1 269 381 2650
Telefax: 1 269 382 8726
Europe, Middle East, Africa
Roosendaal, the Netherlands
Telephone: 31 165 581400
Telefax: 31 165 554590
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
B/M #
F.O
.
6 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 "RepairorReplace."Asignedcerticateofdecontamination
must be attached. A Material Safety Data Sheet (MSDS) 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.
FIS106eng REV 08/12 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.
© 2012 Flowserve Corporation
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