4.
OPTIONS
IOM manual CTI & CTH centrifugal pumps
34
4.10.
External quench – 4Q
This option is similar to the lubricated seal option and is recommended when there is a
potential risk of dry running, or where the product tends to solidify or crystallize when in
contact with air. There is however an added value to this option, as circulating quench liquid
removes heat from the mechanical seal. It is recommended to use a thermos-siphon
circulation method in the quench circuit.
NOTE! Max pressure in the quench circuit is 0,5 bar.
Additional / different parts:
Available for pump sizes C, D and E
Art. no
Q-ty
Description
5-xxx-1141
1
Pump back cover for external quench
5-xxx-1241
1
Pump back casing for external quench
5-xxx-1251
2
Connection joint
5-xxx-159
1
Lip seal
5-xxx-16Z
1
Pump shaft for external quench
4.11.
Mechanical seal options
Apart from different materials that can be used for static and dynamic seal faces as well as
elastomers (see 6.1 “Pump code”) we offer a range of different special execution mechanical
seals:
2P – in this potion the O-ring of the static part of the mechanical seal is replaced
by an OP-ring (square O-ring). This increases friction between the O-ring and the
back casing thus lowering chances of static part rotation when seal faces stick
together.
2K – this option refers only to SiC/SiC mechanical seals. Standard seals have seal
faces of the same hardness therefore there is potential risk of them sticking
together due to adhesion phenomena. 2K offers seal faces of different hardness
(J/D) thus eliminating this risk. Additionaly seal is equipped with OP-ring.
