Articles & Case Studies

Heat exchangers for Severn Trent Water

Posted: Monday 9th February 2009

HRS Group, who are one of Europe’s leading suppliers of heat exchangers and ancillary equipment to the wastewater treatment industry, have recently supplied four sets of corrugated tube in tube heat exchangers to Severn Trent Water. Three of the heat exchanger sets are being used at the Claymills site to heat digester sludge and are each providing 450kW of heating. The fourth one is for the Barston Site. All four have been supplied to replace existing heat exchangers. Severn Trent are happy with the HRS units which are performing very well, with no blocking or maintenance down time.

This project was very challenging for HRS. Severn Trent was taking out three existing sludge heaters which were not performing efficiently. This meant that the pipe work was already set. In addition there was an extremely tight space to fit the new HRS units into. HRS worked very closely with the Severn Trent digester team and GTS, who were responsible for installing the units and built the new pipe work interconnecting the heat exchangers, to ensure that the replacement heat exchangers would fit.

At the Barston site, HRS replaced a spiral heat exchanger, which kept blocking up due to raggy sludge catching around the studs within the spiral channels. The spiral heat exchanger needed to be opened and cleared weekly, adding downtime and high running costs.

The existing hot water and sludge pumps were also being retained at both the Claymills and Barston sites so HRS had to ensure that they designed exchangers with low pressure drops, which could be met by the pumps.

HRS is presently working with the Severn Trent digester team to identify and replace problem heat exchangers on other sites. Many of the existing spiral heat exchangers need a lot of maintenance due to blocking. In each instance HRS personnel visit the site to measure up the space available and check the location of the existing pipe work. The new units complete with framework are then designed with the correct duty and with connections in the right orientation to match up with the existing pipe runs.

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