Flowserve ISC2SS User Manual

ISC

Flow Solutions Division

ISC2SS
Dual Stationary Bellows 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

11

M1

6A

Table 1

34 Outboard Bellows Assembly

34A Inboard Bellows Assembly

3B Outboard Mating Ring

3C Inboard Mating Ring

6 Outboard Mating Ring O-ring

6A Inboard Mating Ring O-ring

P Outboard Bellows O-ring

P1 Inboard Bellows O-ring

G Gasket

G1 Inner Gland O-ring

1 Gland Assembly

B Carbon Bushing

1B Gland Drive Ring

1C Inner Gland

1C␣

3C

SL

10A P1

G

RR

11A 6

G1

3B

M

14

1B

P

B␣ 13A CT K

1

13

34

34A

Notes: - Inboard bellows assembly (34A) is interchangeable with outboard bellows assembly (34).

- Inboard mating ring (3C) is interchangeable with outboard mating ring (3B).

- Primary seal O-rings (P, P1, 6, 6A) are all the same size and cross section.

14 Rotor Carrier

RR Retaining Ring

CT Centering Tab

K Centering Tab Cap Screw

SL Sleeve Assembly

10A Drive Ring

M Outboard Vibration Dampener

M1 Inboard Vibration Dampener

9 Sleeve Collar

13 Cup Point Set Screw

13A Quarter Dog Set Screw

11 Sleeve O-ring

11A Rotor Carrier O-ring

9

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 bellows assem­blies 34A and 34

• Inboard and outboard mating rings 3B
and 3C

• All O-rings P , P1 , 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 Mating ring 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.

E Gland drive ring 1B - Inspect for wear or corrosion.

If worn or corroded, contact your Flowserve representative.

1 Registered Trademark of Loctite Corporation

: 63 RMS

A

E

B

D

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 1C (Figure 4)

A Mating ring 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 Drive flats - Inspect for

wear or corrosion. If worn or
corroded, contact your Flowserve
representative.

Required surface

63 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 four

nd

of the 2
P P1 6 and 6A , quantity
one of the 2

largest size O-ring

nd

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 bellows O-ring
6A in the sleeve O-ring groove
behind the surface with drive flats
in the sleeve. (Figure 7)

O-ring

6A

Vibration

Dampener

M1

5

Inboard

Mating

Ring

3C

Drive Flats

Figure 8

Drive

Ring

10A

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)

4.6 Place the inboard bellows
O-ring P1 into the inner
gland 1C . (Figure 9)

4.7 Align the two flats on the
inboard bellows assembly
34A with the two flats on the
inside of the inner gland, and
press the bellows in place
using finger pressure only.

Be careful not to over compress
the bellows assembly.

(Figure 10)

Figure 9

O-ring

P1

Inner

Gland

10 A

Figure 10

Inboard
Bellows

Assmbly

34A

Drive
Flats

6

4.8 Place the inner gland/bellows
assembly face down onto the
sleeve/mating ring assembly.
(Figure 11)

4.9 Install the inner gland O-ring
G1 into the face groove in
the inner gland. (Figure 11)

4.10 Place the rotor carrier O-ring
11A in the smallest diameter
groove of the rotor carrier

14 .(Figure 12)

Figure 11

O-Ring

G1

Inner

Gland

&

Bellows

Assembly

Figure 12

4.11 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
facing up. (Figure 13)

Sleeve

Rotor Carrier

Drive Flats

Retaining

Ring

Groove

Figure 13

Drive Flats

7

4.12 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 14)

Figure 14

Retaining Ring RR

4.13 Insert the outboard vibration
dampener M into the rotor
carrier. Make sure 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 15)

4.14 Assemble the outboard
mating ring 3B into the
sleeve/rotor carrier
assembly, aligning
the drive flats on the
carrier and mating ring.
(Figure 16)

O-ring

6

Figure 15

Vibration

Dampener

M

Figure 16

Mating

Ring

3B

Sleeve / Rotor

Carrier Assembly

8

O-ring

P

Gland

Drive Ring

1B

Figure 17

4.15 Assemble the outboard
bellows O-ring P into the
gland assembly. (Figure 17)

Outboard

Bellows

Assembly

34

Figure 18

4.16 Assemble the outboard
bellows assembly 34 into
the gland assembly, aligning
the drive flats on the gland
assembly and bellows
assembly. (Figure 18)

Figure 19

4.15 Place the gland/bellows
assembly face down onto the
sleeve/outboard mating ring
assembly. (Figure 19)

9

4.16 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. 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 engaging with the
gland. Be sure to keep the
collar aligned. (Figure 20)

Centering

Tabs

CT

Sleeve

Figure 20

Collar

9

4.17 Using 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 bellows. 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)

10

2 Trademark of Minnesota Mining and Manufacturing Company

Figure 21

O-ring

11

Figure 22

Gland Gasket

G

4.18 Install the shaft O-ring 11
into the inside diameter
groove of the sleeve
assembly. (Figure 22)

4.19Adhere the gland gasket G
to the inner gland gasket
surface with a spray
adhesive such as 3M
Super 77

®2

.

5 Static Testing

5.1 Flowserve manufacturing typically tests the ISC at 25 psig. A pressure drop
of less than one psi over a one minute time period at 25 psig using a test
set-up with a maximum fluid volume of one cubic foot 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. 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 help 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.

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]

FIS141

ORG 06/00 USA