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Marsh Hydroil™ Bypass separators

For areas at ‘low risk’ of oil contamination

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).

Typical applications

  • Car parks
  • Roadways
  • Industrial estates
  • SuDS

Configuration and components are shown for illustration purposes only

Marsh Hydroil bypass oil separator

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.

KEY

  1. Inlet
  2. Oil skimmer plate
  3. Coalescer
  4. Outlet
  5. Access turret
  6. Level alarm dip pipe
  7. Air vent

FLOW PATH

hydroil bypass oil separator flow

Marsh Hydroil bypass oil separator

  • Designed and tested to meet latest UK and European standards
  • Corrosion resistant
  • Tank shells guaranteed for 25 years with a design life of 50 years
  • Heavy duty shells enable installation in all ground conditions
  • Easy access turrets for maintenance and servicing (Turret guards optional)
  • Various alarm types available (Required by EN858-1)
  • Variable invert depths and inlet/outlet configurations ­­­to suit individual site conditions
  • Vented turrets dissipate excessive fumes and vapours

Model Max flow (litre/sec) Drainage area (m2) Silt storage (litres) Oil storage (litres) Diameter Length Height Connection size Inlet invert Outlet invert
NSBP 3 3 1700 300 45 1200 2100 1840 160 900 950
NSBP 4.5 4.5 2550 450 67.5 1200 2100 1840 160 900 950
NSBP 6 6 3400 600 90 1200 2100 1840 160 900 950
NSBP 8 8 4530 800 120 1200 2110 1840 160 900 950
NSBP 10 10 5660 1000 150 1200 2760 1840 160 900 950
NSBP 15 15 8510 1500 225 1200 4030 1840 200 900 950
NSBP 18 18 9940 1800 270 1800 2380 2440 200 900 1000
NSBP 20 20 11370 2000 300 1800 2620 2440 200 900 1000
NSBP 25 25 14185 2500 375 1800 3180 2440 250 900 1000
NSBP 30 30 17000 3000 450 1800 3740 2440 250 900 1000
NSBP 40 40 22650 4000 600 1800 4860 2440 315 900 1000
NSBP 45 45 25325 4500 675 1800 5420 2440 315 900 1000
NSBP 50 50 28000 5000 750 1800 5980 2440 315 900 1000
NSBP 60 60 32333 6000 900 2500 4006 3140 315 900 1000
NSBP 70 70 36665 7000 1050 2500 4566 3140 315 900 1000
NSBP 75 75 41000 7500 1125 2500 4886 3140 315 900 1000
NSBP 80 80 45330 8000 1200 2500 5126 3140 315 900 1000
NSBP 100 100 56660 10000 1500 3000 4674 3640 315 900 1000
NSBP 125 125 70820 12500 1875 3000 5713 3640 315 900 1000

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

Marsh oil separator brochure
Marsh Hydroil brochure
Marsh oil separator manual
Marsh Hydroil manual
Marsh oil separator CE certificate
Marsh Hydroil CE Certificate