Smiths john crane 93AX Installation, Operation & Maintenance Instructions Manual

Separation seal

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Foreword
This manual relates to matters affecting the operation of the Type 93AX
separation seal within compressor machinery. It covers areas directly
associated with the installation, removal, operation and maintenance
of the separation seal. For other related subjects, such as the correct
operation of associated systems or guidance when conducting hazard
analysis (as may be required under the European ATEX Directives), consult
with the compressor equipment supplier and their documentation.
The Type 93AX separation seals are robust in operation. However, any
incorrect handling or assembly fitting can easily lead to seal damage.
Therefore, John Crane's Type 93AX separation seals may only be installed,
commissioned and maintained by a fully trained and authorised plant
machinery specialist. This person must pay close attention to these
instructions, the John Crane seal installation drawing, compressor
equipment supplier's manuals and documentation and all relevant
regulations. Failure to do this relieves the manufacturer John Crane from
any liability or warranties. It is strongly recommended that the seals are
fitted by John Crane trained and approved technicians.
If there are any seal problems that need an urgent response, please
contact your local John Crane sales representative.
Safety Instructions
The safety notes refer to the gas seal arrangement supplied. They can
never be exclusive and must be used in conjunction with the relevant
safety regulations for the machine, auxiliary equipment, plant and
sealed fluid.
WARNING SYMBOLS
The following symbols are used in this instruction manual to highlight
information of particular importance:
Danger - Mandatory instructions designed to prevent
personal injury or extensive damage.
ATTENTION
Special instructions and/or information to avoid damage
to the seal and/or its surroundings.
NOTE
Information for easy installation and efficient operation.
*Please comply with additional warning signs on the system
Prior to any installation, removal, operation and
maintenance of the gas seals, all personnel involved
in these activities must have read and understood this
document before the commencement of any work. If
there is not adequate understanding, contact John
Crane for further advice.
All personnel involved in the installation, operation and
maintenance of the separation seal must have adequate
training and understanding with regards to:
• The separation seals being used
TYPE 93AX
SEPARATION SEAL
Installation, Operation & Maintenance Instructions
• The equipment being worked on, including any
relevant auxiliary equipment and systems
• All tooling and equipment associated with fitting and
removing seals
• The environment in which work is being carried out
• Health, safety and environmental issues associated
with the above points including all relevant local
site, national and international health, safety and
environmental procedures and regulations.
Any working practice that compromises safety must
be avoided.
All personnel involved in the installation, removal,
operation and maintenance of the gas seals must be
authorised by the responsible party to work on the
equipment that the gas seals are fitted to.
At all times, adequate personal protection equipment
should be worn/used. This equipment needs to be
suitable for the environment and surroundings that a
person is working within.
At all stages in work relating to the gas seal, reference
must be made to the John Crane installation drawing,
this document and the compressor equipment supplier's
manuals and documentation and all relevant regulations.
Separation seal cartridge disassembly is not required
for normal operation and maintenance and must never
be undertaken other than by a John Crane trained
technician approved for the seal type being worked
on. Where seals require inspection and refurbishment,
please contact John Crane.
Modifications and/or alterations of the separation seal
in any way are not permitted without the authority of
John Crane. Failure to obtain this authority relieves
the manufacturer John Crane from any liabilities or
warranties.
In the event of an operating problem, the machinery
must be immediately switched off and made safe.
Problems must be solved promptly.
A small controlled gas flow (commonly called the seal
leakage) will occur within the gas seal during normal
seal operation. In cases of a worn or defective seals,
the leakage volumes will increase. This leakage may be
hazardous, toxic and or explosive.
Attention is also drawn to the fact that, on its own,
separation seal leakage may not be dangerous. However,
if it was to combine with other gases, liquids and/or
substances with increased or decreased pressure and
temperature or be subjected to heat and/ or an ignition
source, then the mixture may become hazardous, toxic
and/or explosive.
All leakage will need to be collected and directed
to a safe location by the equipment and systems
1

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Summary of Contents for Smiths john crane 93AX

  • Page 1 TYPE 93AX SEPARATION SEAL Installation, Operation & Maintenance Instructions Foreword • The equipment being worked on, including any relevant auxiliary equipment and systems This manual relates to matters affecting the operation of the Type 93AX • All tooling and equipment associated with fitting and separation seal within compressor machinery.
  • Page 2 TYPE 93AX SEPARATION SEAL Installation, Operation & Maintenance Instructions that the separation seals are fitted to. This needs to Any lifting equipment used for the installation occur under all circumstances including when the and extraction of the gas seals must be adequate separation seals ARE and ARE NOT working normally.
  • Page 3 TYPE 93AX SEPARATION SEAL Installation, Operation & Maintenance Instructions damaged, they should be replaced with a correct part from the spares/ applied sparingly, and only at the seal bore/compressor shaft interface. installation kit, in accordance with the installation drawing. On certain For any O-ring situated on the outside diameter only of the seal cartridge separation seal designs, tolerance rings are located within the seal sleeve (outside diameter of the retainers of the seal stator), sparingly lubricate...
  • Page 4 TYPE 93AX SEPARATION SEAL Installation, Operation & Maintenance Instructions Prior to any attempt to rotate the shaft, the separation need to be adjusted by appropriate machining to achieve the correct rotor to stator working position. Once correctly adjusted, fit shims seal installation plates and associated screws must or spacers into the compressor or to seal cartridge as shown on the be removed.
  • Page 5: Commissioning Procedure

    TYPE 93AX SEPARATION SEAL Installation, Operation & Maintenance Instructions Commissioning Procedure Dynamic Operation 1. Commence normal start up procedure as defined by the compressor Once the separation seals have been installed into the equipment supplier’s manual and documentation. Periodically record compressor and prior to commissioning of the separation the separation seal supply gas consumption or leakage rate during seals, all commissioning procedures as required by the...
  • Page 6: Service Life

    TYPE 93AX SEPARATION SEAL Installation, Operation & Maintenance Instructions be carried out to ensure this is the case and where chemicals which have been specified in the contract of performance trends are exceeding these conditions, seal supply should be allowed to come into contact with corrective actions should be implemented prior to the separation seals.
  • Page 7: Appendix I. Returning Seals To John Crane

    TYPE 93AX SEPARATION SEAL Installation, Operation & Maintenance Instructions Transportation of the tolerance ring are in the direction of the compressor shaft. When replacing tolerance ring, it should always be installed with the dimples ATTENTION It is essential that the separation seals are suitably in the correct direction and the gap in the same location as originally packaged and always transported in the purpose-built supplied.
  • Page 8 TYPE 93AX SEPARATION SEAL Installation, Operation & Maintenance Instructions 13. When the adhesive is fully set, remove any excess adhesive from the seal bore that interferes with seal fitting. ATTENTION It is essential the tolerance ring is fully located in the appropriate groove.

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