Flowserve MARK 3 GROUP 4 User Manual

Page 39

MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12

Page 39 of

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the box and still insert the gland. In this case, omit

the last ring of packing and install the gland. The

last ring of packing should be installed after the

pump has been in service and sufficient space is

available.

Install the gland halves [4120], tighten the gland

nuts [6581] only finger tight.

ew packing has to be run-in and it is

good practice to start the pump with the stuffing box

gland quite loose. Packing that is too tight in the

box will cause undue friction, creating heat which

will glaze the packing and possible score the shaft

sleeves. To be effective, the packing must remain

soft and pliable. If stuffing box friction is so great

that the pump shaft cannot be turned by hand, the

box is not properly packed.

6.10.9.2 Mechanical Seal

Refer to any special instructions supplied with the

mechanical seal.

a) Before the mechanical seal can be installed, the

pump must be assembled with the correct

impeller running clearances (ie: all assembly

steps above). A scribe mark is then placed on

the circumference of the sleeve to mark the end

of the box. This mark is used to locate the seal

position referenced by the mechanical seal

drawing provided.

b) After scribing the sleeve, remove the rotating

element from the casing. Do not adjust the

bearing housing.

c) Remove the impeller nut [2912], impeller [2200],

impeller key [6710] and stuffing box head [4110].

Assemble the mechanical seal components,

including gland plates, gaskets and rotating parts

over the sleeve. Locate the seal relative to the

scribed markings on the shaft sleeve [2445] as

indicated by the seal manufacturers’ instruction.

d) Remove lubricating compound from the impeller

nut and shaft threads. Re-assemble components

in accordance with original assembly procedure

with the exception that Loctite 242 is applied to

the impeller nut [2912] threads. Torque the

impeller nut to the specified value, see section

6.6.

e) Assemble the mechanical seal gland plate and

gasket and fasten using gland studs [6572].

Secure with nuts [6581] and tighten each by

hand. Further tighten the nuts in accordance with

section 6.6. Rotate the shaft to ensure that it

turns freely without rubbing or binding.

f) Re-assemble the rotating element into the

casing. Do not adjust the thrust bearing housing.

6.10.10 Final assembly

a) Lift the assembled pump onto the baseplate,

position the casing feet over the tapped holes in

the baseplate and clamp them.

b) Loosen the bolts that attach the rear support foot

[3134] to the bearing frame [3130]. The rear

support foot is designed with shim allowance

measured vertically. Level the unit and align with

the piping. Tighten the bolts attaching the casing

feet to the baseplate in accordance with the

specific torque specified, see section 6.6. Do not

distort casing or frame.

c) Install the pump coupling or sheave as required.

d) Refer to Section 4, Installation and Section 5,

Preparation for Operation.

e) It is recommended that the pump not be packed

until required. Refer to stuffing box packing

procedure in this section. Protect the stuffing box

bore and seal area with clean dry rags.

Gland packing must not be used when pumping

hazardous liquids.

6.11 Impeller axial clearance adjustment

This procedure should not be used on units

with mechanical seals if the design is such that a

liquid seal cannot be maintained when the rotor is

moved axially against the wear plate.

Unless seal is a cartridge design it may not be

possible to adjust the shaft unless the pump is

dismantled.

Refer to any special instructions supplied with

the mechanical seal

NEVER ATTEMPT TO CHANGE THE

CLEARANCE WHEN THE PUMP IS RUNNING.

If the coupling has limited axial adjustment capability,

the pump and driver must be uncoupled prior to

adjusting the clearance in order to permit free

movement.

A new impeller gasket [4590.3] must be installed

whenever the impeller has been removed from the

shaft.

6.11.1 Installation and clearance setting for

impellers on Mark 3 Group 4 pump

The impeller could have sharp edges, which

could cause an injury. It’s very important to wear

heavy gloves.

a) Install impeller [2200], see section 6.10.6.