Proper Bushings and Seal Technology Ensure VTP Reliability
Vertical turbine pumps (VTPs) are used in a wide range of industries, including pulp and paper as well as water and wastewater. And the shafts on these pumps extend deep under the ground — in some cases 2,000 feet. Because of the often harsh and remote conditions in which these pumps operate, their reliability is paramount.
However, in order for VTPs to be reliable, the bushings and seal technology installed in them must survive for long periods.
A recent article in Pumps & Systems magazine examines the operating and maintenance challenges of VTPs and how users can solve them with a combination of technology for prolonged pump life.
What Does VTP Reliability Look Like?
Proper VTP operation and mechanical seal life rely on several factors, including:
- Selecting the correct mechanical seal
- Ensuring that these long shafts are supported and any movement is limited
- Keeping the seal cool and clean
“The removal and reinstallation expenses for VTPs can be significant for long-set pumps that must be disassembled and reassembled on-site. Proper repair engineering, techniques and attention to dimensional integrity pay dividends in extended operational life for the machine.”
Some of the maintenance challenges associated with VTP reliability and shafts include addressing the requirement of withstanding the short-lived and harsh conditions that come with the operations of this equipment. This includes often starting up in dry-run conditions. Dry running causes VTPs to overheat and damage traditional bushings and seals. Another issue is shaft deflection, which causes premature packing or mechanical seal wear, results in flush water leakage, and can lead to difficulty in controlling the flush water usage.
These concerns can be mitigated with shaft stabilization and by selecting the ideal seal technology that can withstand deflection will improve stuffing box/seal chamber reliability.
Check out the full article on PumpsandSystems.com to learn more about sealing reliability for VTPs and their shafts.