IOM/CPHM/DEC19/01
ISSUE DATE:14-12-2019
Page
23 |48
REVISION NO.1
CAUTION:
1. If helicoil insert is damaged replace impeller nut with new one.
2. Spare impeller nut if ordered always supplied with helicoil insert.
6.2.15 For pumps with mechanical seal arrangement, follow the instructions given
below. (Applicable for internally fitted seals only).
a. Mount the deflector (236) on the shaft.
b. Replace the quenching bush for mechanical seal cover (360) (Throttle bush) if it is
worn out.
c. Place
the
mechanical seal cover
(231)
along with stationary seal
seat/insert/mating ring and gasket (516) and tighten the nuts on studs for
mechanical seal cover on casing cover evenly.
CAUTION:
1)
Tightening of nuts should be done evenly and across corner so that seal face
shall be square to the shaft.
2)
Lapped end of seal seat/insert/mating ring should face the rotating part of the
Mechanical seal.
3)
Insert casing cover (220) in proper position in bearing housing. Tighten the nuts
on the studs of the casing cover.
4)
Mount the rotating part of mechanical seal on the shaft sleeve (315) after
pushing on it. Tighten grub screws provided on rotating element of mechanical
seal after resting seal against step on sleeve.
5)
Mount shaft sleeve key (320) on shaft and push the sleeve (315) along with the
mechanical seal with care till the face of the rotating part touches the stationary
seal seat/insert/mating ring.
6) Fit stuffing box bush (350) into casing cover.
7) Put gasket (515) on shaft sleeve step in proper position.
8)
Fix the impeller on shaft with impeller nut along with the helicoil mid grip insert
and gradually tighten it.
6.2.16 General assembly procedure rotating unit for all pumps:
a) Slide complete, back pullout assembly into pump casing (105).
b) Tighten all nuts on casing studs firmly and evenly.
6.2.18 In case of pumps with gland packing, insert gland packing (430) and lantern ring
(227) in order of 2 rings first then lantern ring and finally 3 rings. Joint should be
staggered.
6.2.19 Put the gland in two halves (229), clamp them with gland bolts (574). Tighten gland
stud nuts.
6.2.20 Fit the constant level oiler (443) and the breather cap (444) in case of pumps with oil
lubrication bearings.
