Giant screw pump to be replaced at major sewage treatment works
ECS Engineering Services is to install a replacement screw pump at Wessex Water’s Avonmouth wastewater recycling, bioresources and renewable energy park, helping secure the capabilities of the facility for decades to come.
Avonmouth wastewater recycling, bioresources and renewable energy park serves a population of about 1,000,000 people in Bristol and the surrounding towns and villages. One of its key pieces of process plant is a very large screw pump which has been in operation for around 40 years. However, it had become badly worn and effectively reached the end of its useful service life.
ECS was asked to inspect the screw pump and make some proposals for its overhaul or replacement. Jake Laughton, the ECS engineer who led the inspection says: “Much of the pump is in a serviceable condition and can be retained, however, the screw itself has reached the end of its life and needs to be replaced.”
At 21 tonnes, 20 metres long, 3.1 metres in diameter and able to pump 3,645 litres of water a second, the screw is simply enormous. ECS has arranged to have a new screw fabricated in Holland by long-standing partner company, Landustrie.
“We have incorporated some important innovations,” says Jake, “including a stainless steel lower bearing, made by Spaans Babcock. This does not need an oil or grease feed, so is both ecologically sound and reduces the maintenance requirements – features that will pay dividends in the long run.”
The design team has evaluated the loading on the pump when it is in use and optimised all the new parts to lengthen the pump’s working life and maximise its efficiency and reliability.
Jamie Wesley, Operations Director at ECS states, “To be involved with machines of this size showcases the excellent capabilities available here at ECS.”