Installation
Experience In Motion
Instructions
Pac-Seal Type 51 and 52
Mechanical Shaft Seal
TM
Description
The Pac-Seal Types 51 and 52 are similar to the Types 21 and 31 in
design, with a crimped head and hex-torque drive system but with a
more exible bellows. The convolution in the seal bellows allows for
greater axial movement and shaft deection than Types 21 and 31. This
adds exibility but reduces pressure capability. Both Types 51 and 52 are
available in double seal congurations and balanced versions.
Type 51 Nomenclature Figure 1
7516
142
2 157
Part Reference Description
2 Seal Drive/Drive Band
14 Stationary Face/Mating Ring
15 Rotating Face/Primary Ring
16 Spring
28 Shell
75 Drive Adapter
28
15 126
14
142 Retainer/Spring Retainer
157 Bellows Diaphragm/ Elastomer Bellows
2
Type 52 Nomenclature Figure 2
15 126
28
7516
142
2 157
Part Reference Description
2 Seal Drive/Drive Band
14 Stationary Face/Mating Ring
15 Rotating Face/Primary Ring
16 Spring
28 Shell
75 Drive Adapter
142 Retainer/Spring Retainer
157 Bellows Diaphragm/ Elastomer Bellows
14
3
1 Equipment Check
1.1 Follow plant safety regulations prior to equipment disassembly
including, but not limited to, the following:
• Lock out motor and valves
• Wear designated personal safety equipment
• Relieve any pressure in the system
• Consult plant MSDS les for hazardous material regulations
1.2 Disassemble pump in accordance with equipment manufacturer’s
instructions and remove sealing arrangement.
1.3 Check Seal documentation for seal design and materials of
construction.
1.4 Check shaft or pump sleeve outer diameter (OD), seal chamber
depth, and seal chamber bore to ensure they are dimensionally
within the tolerances shown on the seal assembly drawing.
(See Figure 3)
Seal Chamber Requirements Figure 3
Seal Working
Height
Seal Chamber Bore
-0.050 mm (-0.002 inch)
Shaft or sleeve OD
-0.050 mm (-0.002 inch)
• 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
• Verify proper shaft and bore lead in chamfers are present and within specifications.
Difficulty and damage can be observed during seal installation without proper
lead in chamfers.
Sleeve or shaft finish to be
1.6 μm (63 μinch) R or better
4
Mating
Ring
Width
a
1.5 Thoroughly inspect and clean the seal chamber and shaft or pump
sleeve. Inspect for corrosion or any defects. Remove all burrs, cuts,
dents or defects that might damage gaskets or allow a leak path.
Replace worn shaft or pump sleeve.
1.6 Check equipment requirements as described in Figure 2. Any
measurement different than what is allowed must be brought within
specications.
1.7 Handle the seal with care; it is manufactured to precise tolerances.
The seal faces are of special importance and should be kept
perfectly clean at all times.
2 Type 51 and Type 52 Installation
2.1 Lubricate the shaft or sleeve lightly. Use a water-based lubricant
(Pac-Ease recommended). If Pac-Ease is not available use a
solution of liquid dish soap in water as lubricant. Note: Never use
grease or oil as an installation lubricant. Oil used to lubricate the
elastomer bellows/cup gasket will signicantly reduce the friction
drive or anti-rotation capability of the component.
2.2 Lubricate the outer diameter (OD) of the stationary elastomer cup
gasket or O-ring with Pac-Ease.
2.3 Press the stationary seal seat rmly into counter bore ensuring it is
bottomed out and squared to the shaft. This can be hand-pressed
or machine-pressed into place taking care to protect the sealing
face from direct contact with any metal object. Use a piece of plastic
between the face and the press or a plastic installation tool when
using a press to install the seat. Additional care must be taken
during the stationary seat assembly to assure the O-ring or cup
gasket is not cut.
5
2.4 Lubricate inner diameter (ID) of the rotating seal head elastomer
bellows with Pac-Ease. Note: For smaller diameter seals it may be
easier to lubricate the shaft.
2.5 Clean both rotating and stationary seal faces with a lint free rag
and isopropyl alcohol. Note Any oil or grease, assembly lubricant,
ngerprints, or other residue from the installation process can cause
the seal to leak.
2.6 Type 51
Slide the rotating seal head by hand along the shaft to a completely
parallel contact with the stationary seat. Where possible, prior
to installation remove the drive adapter (75) in order to expose
the back of the elastomer bellows. Apply pressure to the back of
the metal shell and elastomer bellows. Applying pressure to both
the metal shell and bellows is important to minimize stretching of
bellows on the shaft relative to the rotating seal head. If the drive
adapter (75) is not able to be removed from the seal assembly it
is recommended to push the seal head slightly past its operating
position on the shaft, so when the installation force is removed, it
springs back into the operating position. Replace the driver adapter
if removed. Avoid extreme installation pressure or hammering of the
seal.
Type 52
Slide the rotating seal head by hand along the shaft to a completely
parallel contact with the stationary seat. Apply pressure to the back
of the metal drive adapter/shell and elastomer bellows. Applying
pressure to both the metal drive adapter/shell and bellows is
important to minimize stretching of bellows on the shaft relative
to the rotating seal head. Avoid extreme installation pressure or
hammering of the seal.
6
2.6.1 For back-rst installations apply pressure to the outer
diameter of the seal. Whenever possible even pressure
should be applied to the outer diameter of the seal face,
bellows, and outer shell to provide proper installation.
Care should be taken not to apply pressure directly to
the sealing surface of the seal face to avoid any possible
damage. Press the assembly until the back side of the
spring (or spring retainer if applicable) is ush and parallel
to the equipment. Clean both rotating and stationary seal
faces with a lint free rag and isopropyl alcohol. Note: Any
oil or grease on the seal faces may cause the seal to leak.
2.7 Install spring and spring retainer (if applicable) over shoulder of
metal outer shell. Make sure spring correctly engages shoulder of
seal head and impeller shoulder or spring shaft retainer.
Type 51 and Type 52 Operational Recommendations
3.1 Remove lock outs on equipment and valves
3.2 Do not start up the pump dry to check motor rotation or for any other
reason. Open valves to ood pump with product uid. Vent air from
the casing of the pump and the seal chamber before start-up.
3.3 Observe the start-up. If the seal runs hot or squeals do not allow the
pump to run for any extended time.
3.4 The seal is designed to resist corrosion through proper material
selection. Do not expose the seal materials of construction to
products outside of their corrosion limits. Consult Flowserve for
chemical resistance recommendations.
3.5 Do not exceed pressure and speed limits established for the seal.
3.6 Do not exceed the temperature limits of the seal based on the
materials of construction.
7
TO REORDER REFER TO
flowserve.com
B/M #
F.O
.
FIS219eng ORG 11/13 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.
© 2013 Flowserve Corporation
Flowserve Pac-Seal
1020 Davey Road
Unit 100
Woodridge, Illinois 60521 USA
Telephone: 630 910 2500
EFax: 469 420 4181
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