SPP id: Version 14 > / 141101 / Replaces 140530 / en /
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Series
2.15
INSTRUCTIONS
November 2014
Page
ISO
G
USER'S MANUAL – AHLSTAR
Preventive maintenance
COPYRIGHT © SULZER PUMPS FINLAND OY
ORIGINAL INSTRUCTION
Maintenance of shaft seals
Mechanical seals do not normally require any preventive maintenance actions during their operation. If any problems
occur, the whole seal package is normally renewed. For longer-term shutdown, it is recommended that the sealing
space be flushed, preferably using clean water, if possible.
3.3 Dynamic seal
Dynamic seal, ring type (DS11, DS12)
The expeller (604.21) design of the dynamic seal prevents the leakage of pumped liquid through the stuffing box
during operation. During shut-down, the leakage is prevented by the static seal design (435.21).
Maintenance of shaft seals
Dynamic seals do not normally require any preventive maintenance actions. During the first years of operation, the
static seal (435.21) can yet wear so much that some leakage can occur during stoppages. The static seal is again
functional when sliding the thrust ring (475.21) away from the volute casing so long that the leakage stops. The
thrust ring must always be secured with the nuts (920.21) during operation. This adjustment can be done several
times during the lifetime of the static seal. The wear allowance of the static seal is about half of its thickness. If the
seal has worn more or otherwise damaged, it must be replaced with a new one.
Dynamic seal, plate type (DS13, DS14)
The expeller (604.21) design of the dynamic seal prevents the leakage of pumped liquid through the stuffing box
during operation. During shut-down, the leakage is prevented by the static seal design (435.21).
Maintenance of shaft seals
Dynamic seals do not normally require any preventive maintenance actions. During the first years of operation, the
static seal (435.21) can yet wear so much that some leakage can occur during stoppages. The static seal is again
functional when sliding the thrust ring (475.21) towards the volute casing so long that the leakage stops. The thrust
ring must always be secured with the grub screws (904.21) during operation. This adjustment can be done several
times during the lifetime of the static seal. The wear allowance of the static seal is about half of its thickness. If the
seal has worn more or otherwise damaged, it must be replaced with a new one.
4 Bearing
unit
4.1 Grease lubrication
All the grease-lubricated bearings have been lubricated before the shipment. The pump has one cylinder roller
bearing unit (deep groove ball bearing on shaft size 7) and two single row angular contact ball bearings (O-system,
Table 3).
Table 3, Pump bearings
Shaft size
Impeller side
Coupling side
1
NUP 307 ECJ
7308 BECBM
2
NUP 309 ECJ
7310 BECBM
3
NUP 311 ECJ
7312 BECBM
4
NUP 313 ECJ
7314 BECBM
5
NUP 317 ECJ
7318 BECBM
6
NUP 320 ECJ
7322 BECBM
7 6324 7326
BCBM
SKF designation. If bearings by other manufacturers are used, the corresponding bearing types are required.