Les grandes stations de pompage

Large pumping plants

Société DEGREMONT

Abstract

Degrémont is specialised in large treatment works for sewage water and drinking water. Especially for large drinking warer plants, Degrémont has to supply raw and/or treated water pumping plants. Numerous criteria have to be taken into consideration while designing a pumping plant, like for instance:

- water temperature, with influence on viscosity, outer condensing on pipes,

- dissolved salts and gas content,

- suspended solids, among them big materials, like larger pieces of wood used during construction in a 4 m³/s pumping plant of the Yang Tse river in ChongQing, China, where we had to clean once again a 200 m inlet pipe containing pieces of wood as big as 0.6 x 0.15 x 0.15 m.

These materials were linked to a poor cleaning of the pipe, but under some circumstances some problems con be linked to the raw water itself. In Cisadane, Indonesia, plastic bags are very commonly found in the raw water due to urban pollution. These plastic bags caused 6 large pumps to be stopped for cleaning after as little as 6 hours duty. The solution was long and difficult to find , the customer has to install manuaI screens that he first did not consider ; these screens were initially cleaned by drivers until a scraper was installed.