Flowserve LNGT - Manual (Page 34)

LNGT USER INSTRUCTIONS ENGLISH 00083107 02-08
Page 34 of 48
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6.9.2 Assembly of the impeller
This procedure describes how to assemble the
impeller to the pump shaft.
ƒ Clean the assembly surfaces of the impeller
[2200] and the pump shaft [2110].
ƒ Position the key [6700] into the pump shaft.
ƒ Slide the impeller over the pump shaft.
ƒ Position the impeller correctly by placing the
retaining rings [2531] in the pump shaft.
6.9.3 Assembly of the sleeves
This procedure describes how to assemble the
sleeves to the pump shaft.
ƒ Clean the assembly surfaces of the sleeves
[2445] and the pump shaft [2110].
ƒ Carefully slide the sleeve over the pump shaft.
ƒ The sleeve should be slipped
over the pump shaft until a clearance of 1
mm remains between the impeller and the
shaft sleeve.
ƒ Fit the set screws [6570] [if necessary, drill new
securing holes in the pump shaft if the set
screws do not fit into the old securing holes].
ƒ Secure the set screws using a center punch.
6.9.4 Assembly of the casing wearing ring[s]
This procedure describes how to assemble the
casing wearing rings in the pump casing.
ƒ Clean the assembly surfaces of the casing
wearing ring [1500] and the pump casing [1213
and 1214].
ƒ Position the cylindrical pin [6811] into the
casing wearing ring.
ƒ Check whether this cylindrical
ring is fully seated in the groove of the lower
half of the pump casing. If required, the groove
should be machined using a pneumatically
driven manual cutter. If the wearing ring is not
fully seated, it may be incorrectly aligned in the
pump casing during assembly and will start to
rub.
ƒ Position the casing wearing ring [1500] on the
impeller [2300]. Make sure that the tapered
side of the ring points towards the outside of
the impeller.
6.9.5 Assembly of the upper half of the pump
casing
This procedure describes how to assemble the
upper half of the pump casing to the bottom half of
the pump casing.
ƒ Clean the assembly surfaces of the bottom and
upper halves of the pump casing [1213 and
1214] and make sure that the inside of the
pump casing is clean.
ƒ Fit the gasketing material [4590] between the
two casing halves. Fitting the gasketing
material between the two pump halves is called
'tapping' the gasket. When tapping the gasket,
the gasket sheet is placed on the upper half of
the pump casing. This gasket sheet should be
secured into place using taper dowel pins
[6810] to prevent it from sliding while tapping.
Then a plastic mallet is used to tap along the
sharp edges of the pump casing. The gasketing
material is sheared and cut off by the sharp
edges.
ƒ Having finished the tapping procedure, you
must now finish cut the gasket. Do this by
positioning the upper half of the pump casing
on the bottom half and cutting the excess
gasketing material from the bore holes using a
small knife. Once again the taper dowel pins
are used to secure the gasketing material and
to correctly position the top and bottom halves
of the pump casing in relation to each other.
When finishing the gasket, you should work
very accurately to prevent leakage.
ƒ Remove the upper half of the pump casing.
ƒ Position the pump shaft [2110] with the shaft
sleeves [2445], the impeller [2200] and the
casing wearing rings [1500] around the impeller
into the bottom half of the pump casing. Make
sure that you check the impeller's direction of
rotation.
ƒ Make sure that the casing wearing ring is
positioned correctly (position the cylindrical
pins [6811] correctly into the recesses).
ƒ Position the upper half of the pump casing on
the bottom half and secure it with locating
dowels.
ƒ Fit the nuts [6581] to the stud bolts [6572] of
the pump casing [1213 and 1214]. To prevent
the cover and sealing from becoming warped,
the nuts should be tightened evenly working
your way from the inside to the outside. Finally,
tighten the nuts to the prescribed tightening
torque.
6.9.6 Assembly of the mechanical seal,
throwers and V-rings (Labyrinth rings).
This procedure describes how to pre-assemble
the mechanical seal, the throwers and V-rings
(Labyrinth ring).