Flowserve ISC1EX User Manual

ISC

Flow Solutions Division

ISC1EX
Single Elastomer Bellows

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 10 G 1B P B 13 A CT K

Note: Rotary unit (R) consists of

elastomer bellows rotary unit
and single coil spring.

R

3 M 13 91

Table 1

R Rotary Unit

3 Mating Ring

P Mating Ring O-ring

11 Shaft O-ring

G Gasket

1 Gland Assembly

1B Gland Drive Ring

B Carbon Bushing

CT Centering Tab

K Centering Tab Cap

Screw

10 Sleeve

M Bellows Vibration

Dampener

9 Sleeve Collar

13 Cup Point Set Screw

13A Quarter Dog

Set Screw

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

• Rotary unit R

• Mating ring 3

• All O-rings P 11

• Gland gasket G

• Bellows vibration dampener M

• Centering tabs CT and cap screws K

• Cup point and quarter dog set screws 13 13A

2

© Copyright 2001 Flowserve Corporation

Reconditionable Seal Parts

• Gland assembly 1

• Sleeve 10

• 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 listed areas 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 critical area
listings for finish requirements). 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

: 63 RMS

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.

E

D

A

D Bushing - Inspect for wear, breakage, or

loosened bond with gland. Replace using
Loctite®1 7471 Primer T and Loctite RCTM/640

B

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.

E Gland drive ring 1B - Inspect for wear or corrosion, especially at drive flat

surfaces on ID of drive ring.

Figure 2

C

3.3 Sleeve Assembly 10 (Figure 3)

A O-ring surfaces - Inspect for wear,

nicks, scratches, or corrosion.

Required surface finish

: 63 RMS.

B Elastomer boot sealing surface -

Inspect for wear, nicks,
or corrosion.
Required surface finish:
55 to 80 RMS

C Drive end roundness -

C

No greater than 0.001" TIR

1 Registered Trademark of Loctite Corporation

Figure 3

B

A

3

3.4 Sleeve Collar 9 (Figure 4)

A Threaded holes - Inspect for thread

damage and re-tap as necessary.

B ID bore roundness - no greater than

0.002" TIR

A

C Set screws - Replace cup point and dog

point set screws with those
included with the repair kit. Make sure the

B

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)

• Pac-Ease

• Ethyl alcohol or acetone and clean, lint free towel for cleaning seal faces

4.2 As part of the assembly of the seal, there is a blind fit of the drive flats.
It may be helpful to mark the locations of the 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.

TM2

lubricant (included in repair kit)

Figure 4

4.3 Arrange O-rings by
diametrical size. There
are two sizes: one of the
largest size (O-ring P ,
and one 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.

4.4 Place the mating ring
O-ring P in the gland
assembly in behind the
gland drive ring 1B .
Place the bellows
vibration dampener M
into the groove at the
front surface of the gland
drive ring. (Figure 5)

4

2 Trademark of Flowserve Corporation

Vibration

Dampener

M1

Gland

Drive Ring

1B

Figure 5

O-ring

P

Mating

Ring

3

Lubricate Here

Figure 6

Figure 7

4.5 Align the two flats on the
mating ring 3 with the two
flats on the inside of the
gland drive ring in the
gland assembly, and press
the mating ring into place
using finger pressure only.
(Figure 6)

4.6 Lubricate the elastomer
boot drive surface of the
sleeve 10 and the inside
diameter of the elastomer
boot on the elastomer
bellows rotary unit using
Pac-Ease lubricant.
(Figure 7)

Caution: Do not use
silicone lubricant or other
types of lubricant, as this
may cause slippage
between the sleeve and
the elastomer boot during
operation of the seal.

Figure 8

Rotary

Unit

Single

Coil

Spring

4.7 Install the single coil
spring onto the sleeve
assembly. The spring
should seat over the small
shoulder on the sleeve.
(Figure 8)

4.8 Slide the elastomer
bellows rotary unit onto
the sleeve/coil spring
assembly, but do not
compress. Ensure that
the coil spring is seated
on the small lip of the
elastomer bellows rotary
unit. (Figure 8)

5

4.9 Place the gland/mating
ring assembly face down
over the sleeve/rotary unit
assembly. Do not com­press. (Figure 9)

4.10 Place the sleeve collar 9
onto the gland assembly
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 screw at this time.
Install the centering tabs
CT and flat head cap
screws into the collar while
engaged with the gland.
(Figure 10)

Centering

Tabs

Sleeve

Collar

Figure 9

Figure 10

4.11 Using firm hand pressure
press down the gland
assembly/collar until the
elastomer boot is fully
seated on the step of the
sleeve. This will result in
the collar being pressed
slightly beyond the end of
the sleeve (approx.
Release the gland
assembly/collar until it is
even with the end of the
sleeve, and tighten the
quarter dog set screws
until they are snug. Be
careful not to distort the
sleeve by over tightening
the quarter dog set screws.
(Figure 11)

6

1

/16").

Figure 11

4.12 Install the shaft O-ring 11
into the inside diameter
groove of the sleeve
assembly. (Figure 12)

O-Ring

11

Figure 12

4.13 Apply an even coat of

®3

3M

Super 77 spray
adhesive, free of bubbles
and nodules, to the gland
gasket G . Adhere the
gasket to the gland gasket
surface. (Figure 12)

Gland Gasket

G

5 Static Testing

5.1 The ISC single elastomer bellows seal may be static tested at pressures up
to 150 psi prior to installation on the equipment. Flowserve manufacturing
typically tests the ISC at 25 psig. To static test the seal, bolt it to a single
seal test barrel or to the equipment. Secure the cup point set screws to the
stub shaft or equipment shaft to prevent deformation of the centering tabs
due to axial loads. The seal may be pressureized through either of the
tangential flush ports. 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.

3 Trademark of Minnesota Mining and Manufacturing Company.

7

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]

FIS142

ORIG 03/01 USA