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Case Studies
The Problem
A power generation company required support to improve seal performance on a hydroelectric turbine in the UK.
The mechanical seal was changed from a split radial to a split axial design in 2002 as part of major turbine upgrade programme. However, the replacement seal had never performed as anticipated.
Problems included high leakage rates and an unreliable seal support system.
The Solution
In 2008, the company took the decision to change the seal.
Their preference was to revert to the original radial seal design. However, the original seal had been scrapped and the manufacturer was no longer in existence.
.
NASH was invited to put forward a proposal to manufacture a replacement radial seal.
The aim was to follow the original design as far as possible, but with a modified housing to suit the existing adapter ring as this could not be removed.
Dimensional details were taken from a similar seal on a sister plant and this, combined with information provided by the company, enabled NASH to design and manufacture a split radial seal for retrofit during a planned outage later in the year.
The Benefits
NASH had the knowledge and experience to provide a unique, engineered mechanical seal solution that will restore the water turbine to previous levels of reliability.