6 fastener torques, 7 renewal clearances, 8 disassembly – Flowserve MARK 3 GROUP 4 User Manual

Page 34

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MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12

Page 34 of

48

flowserve.com

®

6.6 Fastener torques

Non-metallic gaskets incur creep

relaxation – retighten to the tightening torques

provided.

All torques specified subject to a tolerance of +/- 10%

Bolt size

Torque Nm (lb ft)

Pump feet

fasteners

All other fasteners

M 16 (⅝ in.)

M 20 (¾ in.)

M 24 (⅞ in.)

M 27 (1 in.)

M 30 (1⅛ in.)

M 36 (1⅜ in.)

M 42 (1⅝ in.)

M 48 (1⅞ in.)

170 (125)

340 (250)

590 (435)

770 (570)

1 100 (810)

1 840 (1 350)

2 000 (1 475)

2 240 (1 650)

84 (62)

165 (120)

285 (210)

375 (275)

540 (400)

900 (660)

1 410 (1 040)

2 060 (1 500)

IMPELLER NUT

TIGHTENING TORQUE

FRAME 4K

Nm

lbf.ft.

400

300

TIGHTENING TORQUE FOR STAINLESS STEEL

STUDS

WITH LUBRICATED THREADS

THREAD SIZE

TIGHTENING TORQUE

Nm

ft. lb.

M10x1.5 (3/8–16UNC)

13

10

M12x1.75 (1/2–13UNC)

27

20

M16X2 (5/8-11UNC)

60

45

M20x2.5 (¾-10UNC)

100

75

6.7 Renewal clearances

As wear takes place between the impeller and casing

the overall efficiency of the pump set will decrease.

To maintain optimum efficiency it is recommended

that the impeller be adjusted to maintain the impeller

axial clearance as detailed in section 6.11 to

clearance as detailed in table 3.5. Typically doubling

the clearance can reduce performance by 5%

depending on pump size and operating condition.

6.8 Disassembly

Refer to section 1.6,

Safety

, before dismantling

the pump.

Before dismantling the pump for

overhaul, ensure genuine Flowserve replacement

parts are available.

To disassemble the pump consult the sectional

drawings, see section 8,

Parts list and drawings

.

6.8.1

Rotor unit

The following procedure is recommended for

removing and disassembling the back pull-out

element (rotating assembly).

Note that the replacement gaskets and

similar consumable materials should be available

since they will be required for reassembly.

a) Isolate motor and lock off electrical supply in

accordance with local regulations.

b) Isolate suction and discharge valves.

c) Remove coupling guards and disconnect the

coupling halves.

d) Drain pump casing. Remove any auxiliary piping

if applicable.

e) Disconnect stuffing box, cooling water and

auxiliary piping.

f) Drain the oil from the bearing frame [3130] if

bearing frame is being dismantled.

g) Place the sling around the bearing frame [3130]

and carefully take up the weight without straining

the casing. Refer to Section 3 to determine hoist

and sling requirements.

h) Release the thrust bearing housing [3240] hold

down bolts and jam nuts. While rotating the

pump shaft [6] by hand, tighten the three jacking

screws evenly until the impeller [2200] lightly

clamps the stuffing box head [4110] in place.

This will simplify withdrawal of the rotating

element from the casing.

Excessive clamping force could

damage bearing races.

Rotating the shaft helps to clear away solids

which may be trapped between the impeller and

stuffing box head.

i) Remove the bolts connecting the rear support

foot [3134] to the baseplate.

j) Remove the frame to casing bolts

k) Withdraw the rotating element from the casing.

6.8.2

Stuffing box

6.8.2.1 Shaft seal - mechanical seal

Refer to any special instructions supplied with the

mechanical seal.

a) Remove seal cover screws and pull off seal cover

complete with the stationary seal ring which is

held in place by the O-ring seal.

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