Are used in hard standing areas where there is a light risk of hydrocarbon contamination to the surface water run off, i.e. Car Parks, Roadways, Industrial Estates, Goods Yards etc. These units are designed to treat the influent up to the design nominal size of the Separator.
Excess flows over and above this are allowed to ‘bypass’ the oil retention chamber, ensuring the stored pollutants remain within the separator. A standard set of sixteen models are available, ranging from the NSB3, which drains an area of 1,667 M2, to the NSB 100, which can drain an area of 55,556 M2. Larger models up to NSB 1000 are also available to order.