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
