Richter RG4 stationary, double - Manual (Page 3)

Series SCK Mechanical seal RG-4, stationary, double, liquid sealed Page 3
9220-064-en Revision 10
TM 7827 Edition 03/2010
2 Safety, transport and storage
The relevant sections in the adjacent installation and
operating manuals apply to safety, transport and
storage.
This installation and operating manual is only valid in
conjunction with the installation and operating
manuals of
SCK long-life grease and oil bath lubrication
9220-050-en
2.1 Intended use
Double mechanical seals for plastic-lined pumps of
the series SCK are suitable for the use of aggressive,
toxic, pure and inflammable media.
The instructions contained in the operating manual or
contractual documentation are to be observed, if
necessary consult the manufacturer.
All the important features are documented in the data
sheet included in the scope of delivery.
3 Product description
For a product description of the pump, see the
installation and operating manual for the SCK series.
The sectional drawing shows a stationary, double
mechanical seal RG-4, liquid sealed. See Section 7. All components which come into contact with the
process medium are either lined with plastic or are
made of other resistant materials, e.g. silicon
carbide.
4 Commissioning / Shutdown
4.1 Initial commissioning
See installation and operating manual for the series
SCK.
4.2 Mechanical seals
The design and material combination are specified in
the data sheet.
The proper condition of the components and
the protective facilities must be ensured to
prevent any risk from escaping medium.
The regulations and recommendations of the
mechanical seal manufacturer must always be
observed.
4.2.1 Use in an explosive area
Use in an explosive area means that only
mechanical seals may be employed which
permit observation of temperature.
The operating manual of the respective mechanical
seal manufacturer is an integral part of this general
operating manual.
This permits, amongst other things, the calculation of
the expected surface temperature at the mechanical
seal. The suitability for the permissible temperature
class as per ATEX is hereby given.
CAUTION:
The permissible temperature class of the complete
unit (pump, mechanical seal, coupling, motor) is
determined by the lowest temperature class of the
individual components.
Example: Pump T4, mechanical seal T3,
coupling T4, motor T4
In both cases the unit may only be used in
atmospheres which may ignite above the temperature
class T3, i.e. >200 °C (>392°F).
4.2.2 Stationary, double mechanical seal
RG-4, liquid sealed
A pump fitted with a double mechanical seal must
not be filled with a product before the
pressurisation system provided has been started
up.
Otherwise damage could occur, e.g. opening of the
wetted sealing gap, before start-up.
To guarantee safe operation, the pressure of the
sealing medium must be 1-2 bar above the pressure
of the process medium at the mechanical seal at
Q=0 m
3 /h. To guarantee safe operation, the pressure
of the sealing medium must be 1-2 bar above the
pressure of the process medium at the mechanical
seal at Q=0 m
3 /h.The required sealing pressure can
be determined as follows:
2/3 of the delivery pressure at Q = 0 m 3 /h
+ supply pressure
+ 1 - 2 bar safety margin