KSB 25 - Supplementary Operating Manual; General; Technical Data; Removing the Shaft Seal

1 Supplementary Operating Manual
4 of 12
Double Mechanical Seals
1 Supplementary Operating Manual
1.1 General
This supplementary operating manual accompanies the installation/operating
manual. All information contained in the installation/operating manual must be
observed.
Table1: Relevant operating manuals
Type series Reference number of the installation/operating
manual
Etaprime L 2753.81
Etaprime B 2753.82
1.2 Technical data
Design details
The shaft is sealed by 2 unbalanced single bi-directional mechanical seals to EN12756
in back-to-back arrangement, with barrier fluid system.
Seal size/ material variant
Table2: Material variant
Shaft unit
Mechanical seal
Outboard (433.02) Inboard (433.01)
Seal size Material variant
1)
Seal size Material variant
25 KU028S-M7-N Q1BVGG KU028S-M7-G49 Q1Q1K9GG-G
35 KU038S-M7-N KU038S-M7-G49
Material code
Table3: Material code
Item Description Code Materials
1 Primary ring Q1 SiC, silicon carbide, sintered without
pressure
2 Mating ring B Resin-impregnated hard carbon
Q1 SiC, silicon carbide, sintered without
pressure
3 Secondary seal V Fluoroelastomer (Viton)
K9 Perfluoroelastomer
4 Spring G CrNiMo steel
5 Other
components
G CrNiMo steel
1.3 Removing the shaft seal
1.3.1 Removing the shaft seal - shaft units 25/35
ü Dismantle the pump as described in operating manual 2753.81 or 2753.82.
ü The back pull-out unit has been placed in a clean and level assembly area.
1. Take hexagon nut 920.95, disc 550.95 (shaft unit 25 only), safety device 930.95,
impeller 230 and discs 550.02/.04 off shaft 210.
2. Take key 940.01 out of the shaft keyway.
3. Take spacer sleeve 525 (shaft unit 35 only) off shaft 210.
4. Remove fitting 720.13/.14 and joint ring 411.13/.14.
5. Undo hexagon nut 920.02 at seal cover 471. Abut the seal cover against the
bearing bracket or motor, as applicable.
1) For units with closed thermosyphon system: material variant Q1Q1K9GG