SPX TG H15-50, Instruction Manual, Page: 26 / 110

26 A.0500.351 – IM-TGH/07.02 EN (10/2015)
Performance
Maximum performance such as viscosity, temperature and working pressure depends on the make of
the mechanical seal and the used materials.
The following basic values can be taken into consideration.
Maximum temperatures of elastomers
Nitrile (P): 110°C
FPM (Fluorocarbon): 180°C
PTFE (solid or PTFE wrapped): 220°C
Chemraz
® : 230°C
Kalrez
®*
: 250°C
* Kalrez
®
is a registered trademark of DuPont Performance Elastomers
Maximum viscosity for GS and GG type
3000 mPas: For single mechanical seals of light construction e.g. Burgmann MG12
5000 mPas: For mechanical seals of strong torque construction (consult manufacturer).
The maximum allowed viscosity between the sliding faces of the mechanical seal depends on the
nature of the liquid (Newtonian, plastic etc.), the sliding speed of the seal faces and the mechanical
construction.
Maximum viscosity for GD type back-to-back double seal
In contrast to single mechanical seals (GS) or double seals in tandem arrangement (GG) the sliding
faces of the GD mechanical seal are lubricated by a barrier fluid under pressure which allows high
viscous liquids to be pumped.
Second sealing box type GG and GD maximum temperature and pressure
Maximum temperature of the second mechanical seal box: 250°C
Maximum allowable pressure of the second mechanical seal box: 16 bar.
Note! The pressure before the first mechanical seal at pumped medium side is lower than the
discharge pressure.
Food applications
Special demanded Burgmann M7N (SiC-SiC seal faces and FDA approved FPM o-rings) seals can
be used in food applications. Each one of these special demanded Burgmann M7N seals have a
“confirmation for FDA-requirements” like the one in the “Declaration of Compliance for food contact
materials” (see last pages of this manual).
3.16.3.2 Cartridge mechanical seals
In TopGear H ranges Universal Cartridge mechanical seals could be built in from pump size
H6-40 to H360-150.
Several functions and more complicated constructions e.g. gas seals, API conformity etc. are
possible. Contact your local supplier if you have a special application or special questions.
The end plate or the gland of the cartridge mechanical seal must be adapted to the built in
dimensions of the TopGear pump. See figure next page.