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.

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

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.

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.

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

surfaces on ID of drive ring.

Figure 2

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 -

No greater than 0.001" TIR

1 Registered Trademark of Loctite Corporation

Figure 3

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