Flowserve ISC2PP User Manual

ISC

Flow Solutions Division

ISC2PP
Dual Pusher Seal

Repair Instructions

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.

1 Nomenclature

Figure 1

Table 1

SL 6A P3

11 10A

M1

3 Outboard Stator

3A Inboard Stator

3B Outboard Mating Ring

3C Inboard Mating Ring

C Outboard Springs

C1 Inboard Springs

SC Outboard Stator Carrier

SC1 Inboard Stator Carrier

P Outboard Dynamic O-ring

P1 Inboard Dynamic O-ring

P2 Outboard Stator O-ring

P3 Inboard Stator O-ring

6 Outboard Mating Ring O-ring

6A Inboard Mating Ring O-ring

G Gasket

G1 Inner Gland O-ring

SC1

P1

C1

3C 3A

Notes: - Inboard stator (3A) is interchangeable with outboard stator (3).

RR M

1CP

13 9

3B KCT13AB

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.

1 Gland Assembly

B Carbon Bushing

1B Inner Gland

14 Rotor Carrier

RR Retaining Ring

CT Centering Tab

K Centering Tab Cap Screw

SL Sleeve Assembly

10A Drive Ring

M Outboard Vibration Dampner

M1 Inboard Vibration Dampner

9 Sleeve Collar

13 Cup Point Set Screw

13A Quarter Dog Set Screw

11 Shaft O-ring

11A Rotor Carrier O-ring

2

© Copyright 2000 Flowserve Corporation

2 Disassembly

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

3 Inspection 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)

A Dynamic O-ring surface - Inspect for wear,

fretting, nicks, scratches, or corrosion.

Required surface finish

B Gasket surface - Remove the old gasket

and clean the gasket surface. Inspect for
nicks, scratches, or corrosion.

C Pipe 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.

D Bushing - 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)

A O-ring surfaces - Inspect for wear,

nicks, scratches, or corrosion.

Required surface finish

B Drive Ring 10A - Inspect for

wear or corrosion, especially
at drive flat surfaces on
ID of drive ring.

C Drive flats for rotor

carrier - Inspect for
wear, rounding of
edges of flats, or
corrosion.

D Drive end roundness

: 63 RMS.

No greater than

0.001" TIR

3.4 Inner Gland 1B (Figure 4)

A Dynamic O-ring surface - Inspect

for wear, fretting, nicks, scratches,
or corrosion.

finish:

B Gland O-ring surface - Inspect

for wear, nicks, scratches,
or corrosion.

finish:

63 RMS.

C Gasket surface - Remove

old gasket and clean surface.
Inspect for nicks, scratches,
or corrosion.

D Anti-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)

A O-ring surfaces - Inspect for

wear, nicks, scratches,
or corrosion.

surface finish

B Pumping vanes - Inspect for

wear, damage, or corrosion.

C Drive flats - Inspect for wear

or corrosion.

4

Required

: 63 RMS.

Figure 5

A

B

C

3.6 Sleeve Collar 9 (Figure 6)

A Threaded holes - Inspect for thread

damage and re-tap as necessary.

B ID bore roundness -

no greater than

A

0.002" TIR

Figure 6

C Set 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.

4 Seal Assembly Instructions

4.1 Tools Required

•3/32", 1/8" hex key wrenches (Sizes < 2.625"); 1/8", 3/16" hex key

wrenches (Sizes 2.625" and larger)

• Silicone grease (included in repair kit)

• 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
P P1 P2 P3 6 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

5 Static 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.

6 Installation

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 Corporation Flow Solutions Division

Primary Worldwide Flow Solutions Division Locations Licensees, authorized agents, and affiliated companies located worldwide

United States

Kalamazoo, MI
Phone [phone]
Fax [phone]

Edmonton, Alberta
Phone [phone]
Fax [phone]

Canada

Scarborough, Ontario
Phone [phone]
Fax [phone]

Singapore Japan

Phone [phone]
Fax [phone]

Printed in U.S.A.

Tlaxcala
Phone [phone]
Fax [phone]

Sao Paulo
Phone [phone]
Fax [phone]

Netherlands

Roosendaal
Phone [phone]
Fax [phone]

Osaka
Phone [phone]
Fax [phone]

www.flowserve.com

ISO 9000

Certified

Argentina

Villa Martelli
Phone [phone]
Fax [phone]

GermanyBrazilMexico

Dortmund
Phone [phone]
Fax [phone]

Australia

Marayong NSW
Phone [phone]
Fax [phone]

FIS137

ORG 06/00 USA