John Crane
1648.2648. and 3648
Type 48
seiies Seals
Installation
Instructions
Safety Instructions
1.
The following designations are used in the installation instructions to
highlight instructions of particular importance.
MOTE:
Refers to special information on how to install or
operate the seal most efficiently.
IATTERITIORI
I
Refers to special information or instructions directed
towards the prevention of damage to the seal or its
surroundings.
n
Refers to mandatory instructions designed to prevent
personal injury or extensive damage to the seal or its
surroundings.
2.
Installation, removal and maintenance of the seal must be carried out
only by qualified personnel who have read and understood these
installation instructions.
3.
The seal is designed exclusively for sealing rotating shafts. The
manufacturer cannot be held liable for use of the seal for purposes
other than this.
4.
The seal must only be used in technically perfect condition, and must
be operated within the recommended performance limits in accordance
with its designated use and the instructions set out in these
instructions.
Before Starting the Equipment
'1.
Check the pump at the coupling for proper alignment of the driver
or motor.
2.
Ensure that the gland plate nutslbolts are securely tightened according
to the pump manual instructions, and all screws are securely
fastened.
3.
Complete the assembly of the pump, and turn the shaft (by hand if
possible) to ensure free rotation.
4.
Consult all available equipment operating instructions to check for
correctness of all piping and connections, particularly regarding seal
recirculation/flush, heating or cooling requirements, and services
external to the seal.
-1
This mechanical seal is designed to operate in a liquid, so
the heat energy it creates is adequately removed,
therefore, the following check should be carried out not
only after seal installation, but also after any period of
equipment inactivity.
Foreword
This instruction manual is provided to familiarize the user with the seal and
its designated use. The instructions must be read and applied whenever
work is done on the seal, and must be kept available for future reference.
1-
These instructions are for the installation and operation of a
seal as used in rotating equipment. The instructions will help
to avoid danger and increase reliability. The information
'
required may change with other types of equipment or
installation arrangements. This manual must be read in
conjunction with the instruction manuals for both the pump
and any ancillary equipment.
If the seal is to be used for an application other than that originally intended
or outside the recommended performance limits, John Crane must be
contacted before its installation and use.
Any warranty may be affected by improper handling, installation, or use of
this seal. Contact the Company for information as to exclusive product
warranty and limitations of liability.
If questions or problems arise, contact your local John Crane
SaleslService
Engineer or the original equipment manufacturer, as appropriate.
-1
John Crane mechanical seals are precision products and
must be handled appropriately. Take particular care to avoid
damage to lapped sealing faces and to flexible sealing rings.
Do not excessively compress the seal before or during
installation.
5.
If the pumped fluid is hazardous or toxic, appropriate precautions
must be taken to ensure that any seal leakage is adequately contained.
Further information on sealing hazardous or toxic fluids should be
obtained from John Crane prior to seal installation.
6.
Fluorocarbon components should never be burned or incinerated as
the fumes and residues are highly toxic.
If fluorocarbons are
accidentally heated above
400'C1750'F, they can decompose,
therefore, protective gloves should be worn as hydrofluoric acid may
be present.
7. PTFE components should never be burned or incinerated as the
fumes are highly toxic.
1-1
Dry-running
-
often indicated by a squealing noise from
the seal area
-
will cause overheating and scoring or other
damage to the sealing surfaces, resulting in excessive
leakage or a much shortened seal life.
Before start-up, ensure that all personnel and
assembly equipment have been moved to a safe
distance so there is no contact with rotating parts on
the pump, seal, coupling, or motor.
WARNING: Seal installation should be handled only by
qualified personnel. If questions arise, contact
the local John Crane
SalesfSenrice Engineer.
Improper use
andfor installation of this product
could result in injury to the person
andlor harmful
emissions to the environment, and may affect any
warrantv on the oroduct. Please contact the
company for information as to exclusive product
warranty and limitations of liability.
5.
Check that the seal chamber fluid lines are open and free of any
obstruction, and ensure that the seal chamber is properly vented and
filled with liquid
-
refer to the pump instruction manual.
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