These instructions are written for trained, experienced technicians familiar with the basic
principles and tools involved in the installation, care and service of mechanical seals and seal
support systems. A complete reading of these instructions by personnel in contact with the
equipment is essential to safety. Incorrect installation, operation or maintenance can result in
personal injury or death to personnel and damage to the equipment.
1Nomenclature
Figure 1
Table 1
SL 6A P3
11 10A
M1
3Outboard Stator
3A Inboard Stator
3B Outboard Mating Ring
3C Inboard Mating Ring
COutboard Springs
C1 Inboard Springs
SC Outboard Stator Carrier
SC1 Inboard Stator Carrier
POutboard Dynamic O-ring
P1 Inboard Dynamic O-ring
P2 Outboard Stator O-ring
P3 Inboard Stator O-ring
6Outboard Mating Ring O-ring
6A Inboard Mating Ring O-ring
GGasket
G1 Inner Gland O-ring
SC1
P1
C1
3C 3A
Notes: - Inboard stator (3A) is interchangeable with outboard stator (3).
RR M
1CP
139
3BKCT13AB
11A
SCP26141B
3
G
G1
- Inboard mating ring (3C) is interchangeable with outboard mating ring (3B).
- Inboard stator carrier (SC1) is interchangeable with outboard stator carrier (SC).
- Primary seal O-rings (P, P1, P2, P3, 6, 6A) are all the same size and cross section.
When disassembling seal, inspect for conditions which may have caused the
need for the seal to be removed from service. If seal was removed due to
premature failure, determine what conditions caused that failure and correct any
problems prior to returning the repaired seal to service. For assistance with seal
failure analysis, please contact your Flowserve representative.
Seal Parts that are always replaced
• Inboard and outboard stators 3 and 3A
• Inboard and outboard mating rings 3B
and 3C
• Springs C and C1
• Inboard and outboard stator carriers
SC and SC1
• All O-rings P , P1 , P2 , P3 , 6 , 6A ,G1 , 11 , 11A
• Gland gasket G
• Vibration dampeners M and M1
• Retaining ring RR
• Centering tabs CT and cap
screws K
• Cup point and quarter dog
set screws 13 and 13A
Reconditionable Seal Parts
• Gland assembly 1
• Sleeve assembly SL
• Inner gland 1B
• Rotor carrier 14
• Sleeve collar 9
3Inspection and Reconditioning
3.1 There are certain critical areas of each part where special attention should be
paid to the condition. If any of the areas listed in 3.2, 3.3 or 3.4 show signs of
wear, corrosion, or other defects that cannot be removed without affecting
the dimensional size of the surfaces by more than 0.001 to 0.002", then the
respective part should be replaced. If grit blasting is performed, it may be
necessary to polish the O-ring surfaces to achieve the required surface finish
(see 3.2A and 3.3A for the required surface finish). If any parts require
machining to correct damage, please contact your Flowserve representative
for dimensional requirements, or for any other questions regarding repair.
3.2 Gland Assembly 1 (Figure 2)
ADynamic O-ring surface - Inspect for wear,
fretting, nicks, scratches, or corrosion.
Required surface finish
BGasket surface - Remove the old gasket
and clean the gasket surface. Inspect for
nicks, scratches, or corrosion.
CPipe taps and other threaded holes -
Inspect for damaged threads or corrosion.
Taps must be clean and free of debris and
corrosion. Re-tap as necessary.
DBushing - Inspect for wear, breakage, or
loosened bond with gland. Replace using
Loctite®1 7471 Primer T and Loctite RCTM/640
or equivalent to adhere the bushing if any of
these conditions exist. A ten minute cure at 400°F
(204°C) is required to achieve full bond strength.
If worn or corroded, contact your Flowserve representative.
1 Registered Trademark of Loctite Corporation
: 32 RMS
B
E
D
A
Figure 2
C
3
3.3 Sleeve Assembly SL (Figure 3)
AO-ring surfaces - Inspect for wear,
nicks, scratches, or corrosion.
Required surface finish
BDrive Ring10A - Inspect for
wear or corrosion, especially
at drive flat surfaces on
ID of drive ring.
CDrive flats for rotor
carrier - Inspect for
wear, rounding of
edges of flats, or
corrosion.
DDrive end roundness
: 63 RMS.
No greater than
0.001" TIR
3.4 Inner Gland 1B (Figure 4)
ADynamic O-ring surface - Inspect
for wear, fretting, nicks, scratches,
or corrosion.
finish:
BGland O-ring surface - Inspect
for wear, nicks, scratches,
or corrosion.
finish:
63 RMS.
CGasket surface - Remove
old gasket and clean surface.
Inspect for nicks, scratches,
or corrosion.
DAnti-rotation pins - Inspect for
wear or corrosion. If worn or
corroded, contact your Flowserve
representative.
Required surface
32 RMS
Required surface
Figure 3
B
C
A
D
Figure 4
C
D
A
B
3.5 Rotor Carrier 14 (Figure 5)
AO-ring surfaces - Inspect for
wear, nicks, scratches,
or corrosion.
surface finish
BPumping vanes - Inspect for
wear, damage, or corrosion.
CDrive flats - Inspect for wear
or corrosion.
4
Required
: 63 RMS.
Figure 5
A
B
C
3.6 Sleeve Collar 9 (Figure 6)
AThreaded holes - Inspect for thread
damage and re-tap as necessary.
BID bore roundness -
no greater than
A
0.002" TIR
Figure 6
CSet screws - Replace cup point and dog point set
screws with those included with the repair kit.
B
Make sure the same threaded holes are used with
the same type set screws.
• Ethyl alcohol or acetone and clean, lint free towel for cleaning seal faces
4.2 As part of the assembly of the seal, there are several blind fits of pins and
drive flats. It may be helpful to mark the locations of the pins or drive flats
with a felt tip marker, or to align the feature with another visible feature on
the seal to assist with assembly. All seal faces should be cleaned with
alcohol or acetone prior to placing the faces together at each respective step
in the assembly process.
4.3 Arrange O-rings by diametrical size. There are four sizes
total: quantity 1 of the largest
size O-ring G1 , quantity six
of the 2
nd
largest size O-rings
PP1P2 P36 and 6A ,
quantity one of the 2nd smallest size O-ring 11A and
quantity 1 of the smallest
size O-ring 11 . Prior to
installing each O-ring at its
respective step, lightly
lubricate with silicone grease
and stretch slightly.
Figure 7
4.4 Place the sleeve assembly
SL on a flat surface with the
collar end facing up. Install
the inboard vibration dampener
M1 into the sleeve end housing.
Place the inboard mating ring
O-ring 6A in the sleeve O-ring
groove behind the surface with
drive flats in the sleeve. (Figure 7)
O-ring
6
Vibration
Dampener
M
5
Mating
Ring
3A
Drive Flats
4.5 Align the two flats on the
inboard mating ring 3C with
the two flats on the inside of
the drive ring 10A in the
sleeve end housing, and
press the mating ring into
place using finger pressure
only. (Figure 8)
Figure 8
Drive
Ring
10A
Figure 9
O-ring
P3
Stator
3A
4.6 Place the inboard stator
O-ring P3 on the O-ring
surface of the inboard stator
3A , which is the smallest
outside diameter. Place
stator face down on a clean,
flat surface. (Figure 9)
4.7 Align the stator drive pins in
stator carrier SC with the
drive slots in the stator and
press the stator carrier in
place using finger pressure
only. (Figure 10)
4.8 Install the springs C in
holes of stator carrier.
6
Figure 10
Align Pin
with Slot
Stator
Carrier
SC
Stator
3
Spring
Locations
4.9 Place the stator and stator
carrier assembly face down
onto the sleeve/mating ring
assembly. (Figure 11)
4.10 Place the inboard dynamic
O-ring P1 in the dynamic
O-ring surface of the inner
gland. (Figure 12) Align the
inner gland drive pins with
the slots in the outside diameter of the stator carrier and
press the inner gland onto
the stator carrier, using even
hand pressure. (Figure 13)
Caution: do not rotate the
inner gland to align the pins
while pressing down. This
could damage the springs.
Once the inner gland is in the
proper position, do not rotate
it until the seal is fully assembled to ensure that the pins
remain aligned.
Figure 11
Stator
Carrier
Assembly
Sleeve/Mating
Ring Assembly
O-Ring
P1
Figure 12
Figure 13
Drive
Pins
Slots
7
4.11 Place the inner gland O-ring
G1 into the face groove in
the inner gland. (Figure 14)
4.12 Place the rotor carrier O-ring
11A in the smallest diameter
groove of the rotor carrier 14
(Figure 15)
Figure 15
Figure 14
4.13 Align the three drive flats on the rotor
carrier with the drive flats on the
sleeve and press the rotor carrier on
the sleeve with the pumping vanes
face up. (Figure 16)
Figure 16
Sleeve
Rotor Carrier
Drive Flats
Retaining
Ring
Groove
Retaining Ring RR
Drive Flats
Figure 17
4.14 Insert the retaining ring RR into the
groove in the sleeve assembly while
pressing down on the rotor carrier.
Make sure that the retaining ring
snaps completely into the groove in
the sleeve assembly. (Figure 17)
8
O-ring
6
O-ring
P
Figure 18
Vibration
Dampner
M
Figure 19
4.15 Insert the outboard vibration
dampener M into the rotor
carrier. Makesure that the
vibration dampener is fully
seated at the bottom of the
rotor carrier. Place the outboard mating ring O-ring 6
in the O-ring groove of the
rotor carrier, which is behind
the surface with two drive
flats. (Figure 18)
4.16 Repeat steps 4.5 through 4.9
to assemble the outboard
mating ring 3B , outboard
stator 3 , outboard stator
O-ring P2 , outboard stator
carrier SC , and springs C
onto the rotor carrier/sleeve
assembly.
4.17 Place the outboard dynamic
O-ring P in the dynamic
O-ring surface of the gland
assembly. (Figure 19)
Gland
Assembly
Drive Pins
Figure 20
4.1 8Align the gland assembly drive
pins with the slots in the outside diameter of the stator
carrier and press the gland
onto the stator carrier, using
even hand pressure.
(Figure 20)
Caution: do not rotate the
gland to align pins while
pressing down. This could
damage the springs. Once
the gland is in the proper
position do not rotate it until
the seal is fully assembled to
ensure that the pins remain
engaged.
9
4.19 Place the sleeve collar 9
onto the end of the sleeve
with the “Flowserve” logo
facing up. Align the quarter
dog set screws with the
smaller holes in the end of
the sleeve. (Figure 21) On
smaller seal sizes, one of
the quarter dog set screws
will be offset by 15 degrees.
Align this quarter dog set
screw with the corresponding offset hole in the end of
the sleeve. Do not tighten
any set screws at this time.
Install the centering tabs CT
and flat head cap screws
into the collar while engaged
with the gland. Be sure to
keep the collar aligned and
be careful not to rotate the
gland.
4.20Using firm hand pressure,
press down on the collar to
be even with the end of the
sleeve assembly. This will in
turn press down the gland
and inner gland, compressing
the springs. While holding the
collar even with the end of
the sleeve assembly, tighten
the quarter dog set screws
into the holes in the sleeve
until snug.
Be careful not to distort the
sleeve by over tightening
the quarter dog set screws.
Figure 21
Centering
Tabs
CT
Figure 22
Note: if the collar cannot be
pressed down to be even with
the end of the sleeve, the
gland or inner gland drive pins
may not be aligned. If this is
the case, do not attempt to
rotate the gland or inner gland
to align the pins. The gland
and/or inner gland should be
disassembled and re-aligned
prior to proceeding further.
10
O-ring
11
Figure 23
4.21Install the shaft O-ring 11
into the inside diameter
groove of the sleeve
assembly. (Figure 23)
4.22Adhere the gland gasket G
to the inner gland gasket
surface with a spray adhesive such as 3M Super 77®2.
(Figure 23)
Gland Gasket
G
5Static Testing
5.1 Flowserve manufacturing typically tests the ISC at 25 psig. A pressure drop
of less than one pound at 25 psig is acceptable. To static test the seal, bolt
or clamp the seal to a pump seal chamber or other device which will hold the
inner gland up against the gland. WARNING: Failure to do this will result in
the inner gland unseating from the gland under pressure, possibly resulting
in damage to the inner gland O-ring and also causing a personal safety risk.
Secure the cup point set screws to the stub shaft or equipment shaft to prevent
deformation of the centering tabs due to axial loads. Apply pressure at either
of the tangential barrier fluid ports, while plugging the opposite port. If the
seal does not pass the static pressure test, disassemble the seal and inspect
for O-ring damage, as this is the most common cause of static test failure.
6Installation
6.1 Refer to the ISC Installation Instructions, FIS120, for proper seal installation.
2 Trademark of Minnesota Mining and Manufacturing Company.
11
TO REORDER REFER TO
B/M #
.
F.O
The information and specifications presented in these repair instructions are believed to be accurate, but are not guaranteed by Flowserve as to
completeness or accuracy. Although Flowserve Corporation can provide general application guidelines, it cannot provide specific information
for all possible applications. The purchaser/user must therefore assume the ultimate responsibility for the proper selection, installation, operation
and maintenance of Flowserve products. Because Flowserve Corporation is continually improving and upgrading its product design, the
specifications, dimensions and information contained herein are subject to change without notice.
Flowserve CorporationFlow Solutions Division
Primary Worldwide Flow Solutions Division Locations Licensees, authorized agents, and affiliated companies located worldwide
United States
Kalamazoo, MI
Phone 616-381-2650
Fax 616-381-8368
Edmonton, Alberta
Phone 780-463-7958
Fax 780-450-1241