RDL
the lower casing when fixing the studs (902.1). For pumps sizes 400 up to 800 assembly procedure for D.E. changes. Mount
spacer ring (504) on the shaft. Mount heated the internal ring of bearing on the shaft (120ºC, 30 minutes). Mount the external
ring of bearing inside the bore of the bearing housing (use uniform pressure) and mount the set in the shaft. Lock the set with
lockwasher and bearing nut. Lubricate the two bearings properly.
Mount bearing covers (360.1) and (360.2) fixing them with screws (901.2). For pumps sizes 600 up to 800 mount the bearing
brackets (330) on the lower casing positioning them to the studs (902.8) and fixing them with the nuts (920.8). Assure that the
contact surfaces between the lower and upper casing are free of dirt. Install studs (902.3), (902.2) and (902.5), if any.
Mount rotating element inside the lower casing according to following steps:
a) Place the bearing housings on the correct position of the studs (902.1).
b) Mount the wear rings in the lower casing.
c) Remove gland covers (452) and lantern rings (458) towards the bearing housings in order to not cause any trouble during
assembly.
d) Leave neck rings (457) already positioned towards of shaft seal chamber.
e) Unfasten rope which maintains the rotating element suspended during assembly.
Center the impeller in the lower casing according to the specific description below. Apply silicone sealing adhesive (598 HB of
Loctite), on the contact surface of lower casing.
Place the upper casing, lifting it through its hooks and guiding it by the studs (902.2), (902.3) and (902.5). Place the guide pin
(560.1). Uniformly tighten in a crosswise pattern the nuts (920.2), (920.3) and (920.5), if any.
Fix the bearing housings through the nut (920.1) observing that the bearing housing be leveled.
Place the studs (902.4) and execute shaft seal according to fig. 6 and instructions of chapter 11.2.2.
Install grease nipple on the bearing housings. Place the sealing rings (420) close to the bearing housings.
Centering impeller in the casing
After placing the rotor in the lower casing and fixed the bearing housings it is important to center the impeller.
The clearance between the impeller and the internal walls of spiral on both sides must be the same. Unequal clearance will
cause higher axial thrust and excessive load on the fixed bearing N.D.E., reducing its useful life, or even damaging it.
For centering, loosen the correct shaft nut (921) to which the set must be dislocated. Tighten the shaft nut on the opposite side
and the set (sleeves and impeller) will dislocate until the shaft nut was unscrewed. When centering is ready tighten the nuts
with key nail type or hook type. Mark the shaft with manual drilling machine, using the existents holes of the shaft nut. Mount
and tighten the grubscrews (904.1) which will seat on the shaft and will lock the nuts.
Note:
Before assembling, lubricate internal diameter with Molykote paste G, the following parts: impeller, protective sleeves, spacer
sleeves and shaft nuts.
7.7.2 Assembly sequence for pumps with mechanical seal
See specific instruction for detailed assembly of mechanical seals.
To Next Page
Loading...
