GROUNDWORKS & DRAINAGE; STRUCTURAL ELEMENTS 41
lead times and can therefore be taken from initial order to commissioning within tight construction schedules.
Glass reinforced plastic (GRP) vs polyethylene
There are two main materials in the construction of pumping station chambers – glass reinforced plastic (GRP) and polyethylene. GRP was once the more popular material, but polyethylene has seen a gradual growth in the market. Both are durable; however, polyethylene is not only recyclable, but has additional benefits such as resistance to chemical corrosion, resilience to ground pressures, and strength against site abuse.
Differences in the manufacturing processes of GRP and polyethylene chambers also bring variations in product lead-times, repeatability and cost. GRP chambers are a manual and labour- intensive process with greater potential for human error, compared to the more automated process of polyethylene chamber construction that guarantees reliability through consistent manufacturing standards. Evidence of design integrity and certification by a recognised test house,
such as British Board of Agrément (BBA), can help in the search for high-quality pumping station providers. Finite Element Analysis (FEA) is also an important factor when choosing a manufacturer, providing evidence of a product’s ability to function over time and withstand a range of forces, such as hydrostatic ground pressures. There are several factors to be considered when choosing a pumping station in each particular project’s case. These include the flow rate of the development being served; the distance the media must be pumped to the nearest sewage system; how high the pump can lift the medium (head lift); the potential loss of power and pressure needed for pump operation (‘rising main friction loss’), as well as power requirements and medium storage requirements. Selecting a pumping station with maximum efficiency and operational life is a job for professionals who have experience in optimising the decision process. Take the time to select a company that offers a selection service that you can rely upon, providing support from concept to commission and beyond, with after sales and monitoring systems for long- term reliability.
Package pumping stations are single, complete, preformed units that consist of the chamber, pumps, pipework, valves, control panel and level controls
ADF MARCH 2023
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