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

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␣

10A P1

11A 6

B␣ 13A CT K

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

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

Figure 2

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

Figure 4

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.

Required

: 63 RMS.

Figure 5

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