Marsh Hydroil™ Bypass separators

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

Operating principle

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

Inlet
Oil skimmer plate
Coalescer
Outlet

5. Access turret

6. Level alarm dip pipe

7. Air vent

FLOW PATH

hydroil bypass oil separator flow

Benefits

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

Specifications

Specifications table
Model	Max flow (litre/sec)	Drainage area (m2)	Silt storage (litres)	Oil storage (litres)	Width +/-50mm	Length +/-50mm	Height +/-50mm	Connection size	Inlet invert	Outlet invert
NSBP 3	30	1700	300	45	1354	2254	1834	160	900	950
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	1050
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 Twin wall	1350	1450
NSBP 65	650	36829	6500	975	2622	4303	3172	600 I/D Twin wall	1350	1450
NSBP 70	700	39620	7000	1050	2622	4578	3172	600 I/D Twin wall	1350	1450
NSBP 75	750	42495	7500	1125	2622	4908	3172	600 I/D Twin wall	1350	1450
NSBP 80	800	45330	8000	1200	2622	5415	3172	600 I/D Twin wall	1350	1450
NSBP 100	1000	56660	10000	1500	3128	4702	3678	600 I/D Twin wall	1525	1625
NSBP 125	1250	70820	12500	1875	3128	5741	3678	TBC*	TBC*	TBC*
NSBP 130	1300	73658	13000	1950	3128	6028	3678	TBC*	TBC*	TBC*
NSBP 150	1500	84990	15000	2255	3128	6780	3678	TBC*	TBC*	TBC*

*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%.