•
If you cannot tighten the packing to obtain less than the specified leakage rate, then replace the packing.
6.3.3 Dynamic-seal maintenance
WARNING:
Dynamic seals are not allowed in an ATEX-classified environment.
About the dynamic seal
Dynamic seal parts do not wear substantially to affect operation and do not require maintenance unless
the service is particularly abrasive or corrosive.
Repeller
The dynamic repeller prevents pumpage leaks through the stuffing box when the pump operates under
published acceptable conditions.
Static seal
A static seal prevents leakage when the pump is shut down. A static seal is either of the following:
•
a lip seal
•
an elastomeric-face seal
•
graphite packing
The only maintenance that the lip seal and the elastomeric-face seal require is replacement when leak-
age becomes excessive.
The graphite packing should be installed as stuffing-box packing and is designed to run dry.
6.4 Disassembly
6.4.1 Disassembly precautions
WARNING:
•
Failure to disconnect and lock out driver power may result in serious physical injury or
death. Always disconnect and lock out power to the driver before performing any installa-
tion or maintenance tasks.
•
Electrical connections must be made by certified electricians in compliance with all
international, national, state, and local rules.
•
Refer to driver/coupling/gear manufacturer's installation and operation manuals
(IOM) for specific instructions and recommendations.
•
Risk of serious personal injury. Applying heat to impellers, propellers, or their retaining
devices can cause trapped liquid to rapidly expand and result in a violent explosion. This
manual clearly identifies accepted methods for disassembling units. These methods must
be adhered to. Never apply heat to aid in their removal unless explicitly stated in this
manual.
•
Handling heavy equipment poses a crush hazard. Use caution during handling and wear
appropriate Personal Protective Equipment (PPE, such as steel-toed shoes, gloves, etc.)
at all times.
6.4 Disassembly
76
Model CV 3196 i-FRAME Installation, Operation, and Maintenance Manual