Flowserve Worthington WXB User Manual download pdf (Page 33)

WXB USER INSTRUCTIONS ENGLISH - 07/14

Page 33 of 51

Gaps apply approximately for wear rings

in assembled condition.

6.9 Assembly

To assemble the pump consult the sectional

drawings.

Ensure threads, gasket and O-ring mating faces are

clean. Apply thread sealant to non-face sealing pipe

thread fittings.

6.9.1 Assembly of hydraulic cartridge

Be sure that the casing wear rings

[1500.1,1500.2] are pressed in the stage casings

[1160.1] respectively in the suction casing [1130], the

impeller wear ring[2300.1, 2300.2] are pressed on the

impellers [2200.1, 2200.2]. The rings should be fitted by

tack welding or if necessary by grub screws. The same

applies to the interstage bush [1610] in the diffusers

[1410.1] and the packing seating ring [4133] in the

stuffing box housing [4110].

1) Assembling of the pump is easier in vertical

position (horizontal position is possible too). Use

the reverse procedure as described in the

chapter 6.7.5 Dismantling of hydraulic section.

2) Put the suction casing [1130] with the line bearing

side down on a suitable support. Now insert the

shaft in the suction casing screw it on a vertically

positioned screw.

3) Put the key [6700.1] for the first stage in the shaft

groove. Slide the first impeller [2200.2] from

upwards carefully on the shaft till it touches the

shoulder on the shaft. Adjust the shaft inclusive the

impeller in reference to the suction casing by

turning the shaft in the device. The right position is

reached when the casing wear ring in the suction

casing is even with the impeller wear ring of the

first stage. This visual check is sufficient because

the exact position of the shaft will be committed by

assembling the thrust bearing.

4) Now put from upwards the stage casing [1160.1]

together with the tightly sitting diffuser [1410.1] , o-

ring [4610.7], interstage bush [1610] and casing

wear ring [1500.1] over the shaft [2100] and the

impeller [2200.1] down to the suction casing [1130].

5) Slight the interstage sleeve [2410] on the shaft,

taking care that it catches the key [6700.1]. When it

isn’t the case all parts on the shaft would be

displaced to the thrust bearing and after the pump

is complete assembled it would not turn.

6) Be sure to follow the reverse sequence of all parts

according to the one of dismantling. Watch the

numbers designated at dismantling.

7) After mounting the diffuser of the last stage

[1410.2], put on the cup springs [4263] and finally

the discharge casing [1140] together with the bush

[1600].

The bush [1600] is screwed with

socket head cap screws [6579.3] to the discharge

casing [1140]. Don´t forget the o-ring [4610.6]

8) Slight the balance drum [6230] on the shaft, so that

the groove on it catches the key [6700.1]. Put the

retaining ring [2530] in the groove on the shaft,

slight the ring [1240] over it and fix it with the

socket head cap screws [6579.2].

9) Now assembly the line bearing and thrust bearing

side including mechanical seals. Refer to chapter

6.9.2, 6.9.3 and 6.9.4.

10) Put on the o-rings [4610.9] to the discharge casing

[1140], the o-rings [4610.10] to the last stage

casing [1160.2] and the o-rings [4610.11] to the

suction casing [1130].

11) Now the hydraulic cartridge is fully assembled and

can be put into the casing [1100]. Use the joining

piece for barrel [3121.1] with the help of the stud

[6572.4] for final pulling off the hydraulic cartridge.

By putting the hydraulic

cartridge into the barrel take care of the o-rings

[4610.9, 4610.10, 4610.11].

12) Now tight crosswise the hex nuts [6581.1] of the

studs [6572.1]. For final torque refer to section

6.5, Fastener torques.

The pump can also be assembled by

putting the hydraulic parts piece per piece into

the barrel.

6.9.2 Assembly of shaft seal

Slide on the mechanical seal cartridge to the shaft

[2100] and fix it to the stuffing box housing [4110]

using hex nuts [6581.4] and studs [6572.2].

If the mechanical seal is

equipped with a pumping device, pay attention to the

correct sense of rotation of the same (line bearing

side is different from thrust bearing side).

1) For assembly of shaft seal use the reverse

procedure as described in section 6.7.4

„Dismantling of mechanical seal“. Afterwards follow

the instructions in section 6.9.3 „Assembly of the

thrust bearing side“ or section 6.9.4 „Assembly of

line bearing side“.

2) Replacing the mechanical seal extreme cleanness

is recommended. The sealing faces of the

mechanical seal must be free of scratches or other

damages and have to be cleaned once again

before assembly.

3) Before sliding the rotating parts on the shaft

respectively on the shaft sleeve, the fits must be

sufficiently lubricated with a molykote paste. Take

care that the sealing faces remain clean and no

grease touches them.

4) For those mechanical seals equipped with single

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Flowserve Worthington WXB User Manual Page 33

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