Flowserve Worthington WXB User Manual download pdf (Page 40)

WXB USER INSTRUCTIONS ENGLISH - 07/14

Page 40 of 51

7.6.4 Dismantling of mechanical seal

1) Secure the mechanical seal by putting the mounting

plates into the groove of the shaft sleeve. Loose the

grub screws, and disconnect the seal piping.

Drain the seal system, if

applicable.

2) Loose hex nuts [6581.4] and pull off mechanical seal

cartridge from the shaft. [2100]

7.6.5 Dismantling of hydraulic cartridge

1) Start at the line bearing side first following chapter

6.7.2 and 6.7.4.

2) As next step dismantle the thrust bearing side

following chapter 6.7.3 and 6.7.4.

3) The further dismantling has to be executed from the

thrust bearing side. Remove the o-ring [4610.4] and

draw the stuffing box housing [4110] out of the

discharge casing [1140].

4) Open the hex nuts [6581.1] of the studs [6572.1] and

dismantle the pump stage by stage beginning at

thrust bearing side.

5) First off all loose the socket head cup screws

[6579.2] at the balancing drum [6230]. Then remove

the clamping ring [1240], which is fixing the retaining

ring [2530]. Now pull the balance drum [6230] from

the shaft.

6) Now take the cup spring [4263] and the diffuser last

stage [1410.2]out of the pump.

7) Start to dismantle the pump stage by stage. All parts

of a stage (impeller [2200.1, 2200.2], diffusers

[1410.2, 1410.1], the captive rings [2530.2] and

stage casing [1160.1] have to be numbered to

assure a reassemble in original sequence. The

availability of a crane to secure the heavy parts

would be very helpful, to avoid that they will fall on

the shaft and damage or bend it.

8) Support the stage casing which is next to the

discharge casing. Lift the discharge casing inclusive

the bush [1600], which is fixed on it and also the

diffuser of the last stage [1410.2] which is close in

the casing. When necessary remove the bush from

the discharge casing by loosen the socket head cap

screws [6579.3]. By removing the o-ring [4610.6] out

of the discharge casing with the help of a sharp tool

also the diffuser can be removed.

9) Now remove the captive rings [2530.2] and draw off

the impeller [2200.1] with the impeller wear ring

[2300.1] from the shaft. Then take the key [6700.2]

out of the groove and support the next stage casing

[1160.1] which is closer to the suction casing and lift

the last stage casing inclusive diffuser [1410.1] and

casing wear ring from the pump.

10) As next step remove the interstage sleeve [2410] ,

the impeller [2200.1] with the impeller wear ring

[2300.1] and the captive rings [2530.2] from the

shaft. Now take again one key [6700.1] from the

shaft and support the next stage casing. Remove

the next stage casing still you have reached the

suction casing [1130].

11) Remove the impeller first stage [2200.2] with the

impeller wear ring [2300.2]. Then you can draw the

shaft out off the suction casing. Pull out the suction

casing [1130] from the casing [1100]. In the suction

casing you can find the casing wear ring for the first

stage [1500.2].

Pumps equipped with an inducer

have a separate stage casing in front of 1st

stage impeller.

7.7 Examination of parts

1) Check the casing wear ring and the impeller wear

ring against any wear. The diametrical clearance

between the rings must not exceed twice the

value in new condition.

2) Check all parts against corrosion and erosion.

3) Carefully check the coupling against any wear.

Rotate the angular contact bearing by hand, to

check against abnormal sound. Check the

bearing cages against any wear and the outer

and inner race against running marks. Check the

runout of the shafts. TIR (Total Indicated Runout)

shall not exceed 0.04 mm/m (0.0005 in./ft) of

length. TIR shall not exceed 0.08 mm (0.003 in.)

over total shaft length.

7.7.1 Gap between particular parts

The diametrical gap between casing wear rings

[1500.1, 1500.2] and impeller wear rings [2300.1,

2300.2] in assembled condition is:

Pump

size

Material

Diametrical

gap

diametrical gap between

balance drum [6230] and

bush [1600] mm (in.)

2 WXB

Steel rings

mm (in.)

0,4 (0.016)

0,3

(0.012)

Stainless

rings

mm (in.)

0,5 (0.019)

3 WXB

Steel rings

mm (in.)

0,45 (0.017)

0,4

(0.016)

Stainless

rings

mm (in.)

0,55 (0.022)

4 WXB

Steel rings

mm (in.)

0,45 (0.017)

0,35

(0.014)

Stainless

rings

mm (in.)

0,55 (0.022)

6 WXB

Steel rings

mm (in.)

0,45 (0.017)

0,4

(0.016)

Stainless

rings

mm (in.)

0,55 (0.022)

The diametrical gap between diffuser [1410.1] or

interstage bush [1610] and interstage sleeve [2410] is

0,25 mm (0.010 in.).

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Flowserve Worthington WXB User Manual Page 40

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