FRBH, FRBHX AND FRBHS USER INSTRUCTIONS ENGLISH 71569178 20-08
Page 47 of 60
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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 [4121], tighten the gland nuts
[6580] 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.
6.10.11.2
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 [6700] and stuffing box head [4100].
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 nut in
accordance with information below.
MINIMUM IMPELLER NUT
TIGHTENING TORQUE
FRAME
Ft. lbs.
Nm.
1
100
140
2
300
400
3
300
400
4
550
750
e) Assemble the mechanical seal gland plate and
gasket and fasten using gland studs [6573].
Secure with nuts [6580] and tighten each by hand.
Further tighten the nuts in accordance with Table
in 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.
g) Set the deflector [2540] at the line bearing cover
[3260] so that they do not contact when the shaft
is rotated. Lock in place with the setscrews
provided.
6.10.12
Final assembly
a) Lift the assembled pump onto the baseplate and
position the casing feet over the tapped holes in
the baseplate.
b) On all sizes except the 18FRBH-274, loosen the
bolts that attach the read support foot [3134] to
the bearing bracket [3130]. Level the unit and
align with the piping. Tighten the bolts attaching
the casing feet to the baseplate in accordance
with Table 6.6 using for tightening torques. 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.
6.11
Impeller axial clearance adjustment
6.11.1
FRBH and FRBHX Units
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.
