Flowserve MARK 3 GROUP 4 - Manual (Page 39)

MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12
Page 39 of 48 flowserve.com
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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.
f) Install the gland halves [4120], tighten the gland
nuts [6581] only finger tight.
N 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.