There two broad categories of pumps used in the industries: the pumps with mechanical seals and sealless magnetic drive pumps.
Mostly the mechanical seal pumps are used and selected because of a lack of knowledge regarding mag drive pumps.
Some of the important factors of comparison are:
1) Sealing of the fluid being pumped:
2) Wearing of the seal and maintenance:
3) Mode of driving or pump design:
4) Type of fluids being pumped or application:
Global Pumps are a major distributor of Techniflo magnetic drive pumps in Australia and New Zealand.