Since their inception, the reliability
and mean time between failure of mechanical seals fitted to pumps have been inconsistent.
Operational experience shows that seal performance varies relative to application,
pump type and manufacture. A significant amount of research in seal face materials,
hydraulic and thermal face distortion, face lubrication, seal cooling, etc.,
has been carried out by a number of mechanical seal makers and, while Large strides
in technology and seal performance have been achieved, the ultimate breakthrough
which will give consistent high reliability mechanical seals has still to be
made. As a contribution towards achieving this step change in operation, the
pump maker should recognize those design and manufacturing aspects of pump design
that affect the seal performance and, where necessary, alter pump design philosophy
to ensure the pump to seal interface is idealised not only from the standpoint
of the pump, but also from that of the mechanical seals. Here followed some requirement
for the pump.
A. Radial runout of shaft < 0.03mm
B. Coaxiality of shaft and sealing chamber > 0.02mm
C. Verticality of shaft and sealing face < 0.05mm
D. Axial float <0.01 mm
E. Amplitude of vibration of the shaft during running <10um |
