Wilo -SCP Einbau- Und Betriebsanleitung Seite 52

English
6.1.2 Neck ring
To prevent the entry of pump liquid from delivery
side of impeller to suction side, neck ring is provi-
ded. Fine running clearence is provided between
neck ring and impeller neck. Periodic restoration
of this clearence is necessary for satisfactory per-
formance of the pump. For two stage pumps these
neckrings are located in the bottom half of the
casing by half-spigot (tung and groove) and its
rotation is restricted by flat face of the top casing.
For rest of the single stage pumps plain neck rings
with neck ring pins in bottom casing for locking
are used. The neck ring pin is press fitted in the
neck ring.
6.1.3 Sealing system
To prevent leakage along the shaft at the point of
For gland pack version pumps
No. Part description
1 Shaft
2 Impeller
3 Impeller key
4 Sleeve
5 Neck ring
6 Sleeve nut
7 Spacer Sleeve
8 Stuffing box bush
9 Logging ring
10 Gland
11 Gland packing
12 Thrust collar
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emergence from the pump casing, gland packing
or mechanical seals may be fitted in the stuffing
box situated at each end of the casing.
Gland Pack
For SCP pumps plaited cotton impregnated with
oil and colloidal graphite is used.
Mechanical Seal
For SCP pumps Burgmann made MG1 or M7
mechanical seals are used.
6.1.4 Rotating element
The rotating element of SCP pump consist of fol-
lowing parts
No. Part description
13 O-ring
14 Bearing end cover (D.E.)
15 Bearing (D.E.)
16 Bearing housing (D.E.)
17 Bearing end cover (N.D.E.)
18 Bearing (N.D.E.)
19 Lock washer
20 Lock nut
21 Bearing housing (N.D.E.)
22 Coupling key
23 Water thrower
24 Neck ring pin
WILO SE 10/2019