A Bypass Oil Separator is used in a ‘low risk’ environment where there is no requirement to provide full treatment for the flow; for example a car park where the risk of a significant spillage is small.
Designed and tested to BS EN858 parts 1&2, Marsh Hydroil bypass separators are manufactured from virgin unfilled resin offering exceptional durability, impact resistance and are guaranteed to be watertight and of uniform thickness. These combined properties ensure that the full range of separators stand up to the most rigorous conditions during their service life.
Internal working components, such as coalescing filters, weirs, oil skimmer plates, and their configurations offer the most modern and efficient oil/water separation capability available to the market today.
A wide choice of inlet and outlet positions are available on the units – detailed requirements should be provided at time of order (standard inlet and outlet positions will otherwise be fitted).
Configuration and components are shown for illustration purposes only
Marsh Hydroil bypass separators are designed to treat 10% of peak flow.
The drainage areas served by each separator are determined in accordance with both BS EN858 parts 1&2, but also with reference to a formula provided by the Environment Agency, where NSB=0.0018xA (catchment area in m2). Flows from higher rainfall rates are allowed to bypass the main separation chamber.
|Model||Max flow (litre/sec)||Drainage area (m2)||Silt storage (litres)||Oil storage (litres)||Width
|Connection size||Inlet invert||Outlet invert|
|NSBP 4||45||2550||450||67.5||1354||2254||1834||160 O/D||900||950|
|NSBP 6||60||3400||600||90||1354||2254||1784||200 O/D||900||950|
|NSBP 8||80||4530||800||120||1354||2254||1784||200 O/D||900||950|
|NSBP 10||100||5660||1000||150||1354||2914||1784||315 O/D||900||950|
|NSBP 15||150||8510||1500||225||1354||4184||1784||315 O/D||900||1000|
|NSBP 18||180||10198||1800||270||1818||2398||2418||400 O/D||1050||1150|
|NSBP 20||200||11370||2000||300||1818||2398||2418||400 O/D||1050||1150|
|NSBP 25||250||14185||2500||375||1818||3198||2418||400 O/D||1050||1150|
|NSBP 30||300||17000||3000||450||1818||3758||2418||500 O/D||1185||1285|
|NSBP 40||400||22650||4000||600||1818||4878||2418||500 O/D||1185||1285|
|NSBP 45||450||25325||4500||675||1818||5438||2418||500 O/D||1185||1285|
|NSBP 50||500||28330||5000||750||1818||5998||2418||500 O/D||1185||1285|
|NSBP 60||600||33996||6000||900||2622||4028||3172||600 I/D
|NSBP 65||650||36829||6500||975||2622||4303||3172||600 I/D
|NSBP 70||700||39620||7000||1050||2622||4578||3172||600 I/D
|NSBP 75||750||42495||7500||1125||2622||4908||3172||600 I/D
|NSBP 80||800||45330||8000||1200||2622||5415||3172||600 I/D
|NSBP 100||1000||56660||10000||1500||3128||4702||3678||600 I/D
*Pipework and inverts sized on application
> The dimensions given on this page are for guidance only.
> For precise tank sizes and configurations, please contact Marsh Industries.
> Number of access shafts will be built to suit site specifications and to maintain safe access for emptying.
> All dimensions in mm.
> Due to production processes, dimensions of finished units are within a tolerance of +/-2.5%.