FLEXIBLE COUPLINGS : Asbestos Pipe Removal in Cooling Towers

Date: 17/10/11

As part of a Major Life Extension project, the cooling towers at a coal power station are undergoing a total replacement of the water-cooling system and the asbestos piping network covering the base of the towers.

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Asbestos Pipe Removal in Cooling Towers

Flexseal couplings played a vital role in this refurbishment, as after the removal of the lateral asbestos pipes, the project required connecting around 200 new lateral plastic pipes to existing pipe outlets.

The main objective of the project was the replacement of the packing in the 5m deep modular block system used to cool the water. The reasons for this are three-fold:

• To improve the thermal performance of the cooling towers
• To remove the increasing levels of siltation 
• To ensure the structural integrity of the system for the next 20 years

The project also provided an ideal opportunity to remove the 350 tonnes of asbestos pipe that dates back to the original build in the 1960s.

The pictures show a platform around 15 metres above ground, and an enormous network of temporary wooden scaffolds used to support the pipes during installation.

The black surface seen in the images above is the new thin-film plastic packing system. The hot water flows into the cooling tower at a temperature of 27.3 degrees C, flows through the new pipes and out of the sprinklers. It is cooled to 17.8 degrees C whilst filtering through the blocks, before being fed into a canal system underneath, and pumped back into the power generation system. The flow rate per tower is around 6.3 millions gallons per hour, at 0.44bar per pipe.

The project used a number of Flexseal products throughout:

• 8 x AC1362
• 16 x AC2101
• 26 x AC2356
• 26 x AC2756
• 24 x AC3208
• 72 x AC3608
• 156 x SC360

The contractors considered using fibreglass cement as an alternative to couplings, but this is a far more time consuming and complex procedure. The use of couplings also doesn't require a detailed risk assessment with full coshh data.

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