Project Description

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Mater Hospital, Surface Water Case Study

BMS Design Details: The Mater Hospital is one of the largest hospitals in Ireland.  FIMA Developments were the main Groundworks Contractor on the project for the main contractor, John Sisk and Sons Ltd.  The BMS Stormbreaker Defender Vortex Silt/Oil/Debris Seperator proved an ideal solution for the project to remove any oil/silt/debris before the surface water flowed into an existing on site attenuation system.  BMS unsurpassed ability to custom manufacture large tanks allowed the design and manufacture of a very large vortex silt/oil separator for flows of up to 250 l/s.  The 250 l/s Stormbreaker Defender involved transport in the early hours of the morning as an oversized load with an escort.  The Stormbreaker Defender is part of BMS surface water a ‘one stop shop’ for all surface water products from design to installation including attenuation, interceptors, holding tanks (incl. chemical resistant), Stormbrake Outlet Flow Control, rainwater harvesting tanks/filters & vortex silt/oil/debris separators, fully fitted pumping stations, our plug & play vehicle wash water recycling system; the Recyclone and much more.

To further enhance our surface water product offering BMS now offer free design of your surface water management system from first principles using specialist software and even install your system for you or provide supervision.  Highlighting BMS ‘one stop shop’, BMS also supplied a small full retention interceptor, a Stormbrake Outlet Flow Control and a non return valve for fitting alongside the Stormbreaker Defender.

Supply Details:

Stormbrake Outlet Flow Control

(a) 1 No. 5 l/s BMS Stormbrake


(a) 1 No. BMS PF3 Class 1 Full Retention Interceptor (NSF 5.6 / Max Flow 5.6 l/s / 2,000 l Capacity)

Vortex Silt/Oil Seperator

(a) 1 No. BMS 250 l/s Stormbreaker Defender

(a) 1 No. 150 mm non return valve (NRV)

Construction/Installation Details: BMS designed, manufactured and delivered all of the above.

Operation/Maintenance Details:

The Stormbreaker Defender is very easy to maintain.  Depending on the flow and pollutant loading on site the containment chamber of the Defender can be cleaned by suction tanker by an appropriately licensed contractor.  The easy access sediment and floatable containment chambers should be monitored periodically for pollutant loading.  Similarly any silt and oil in a BMS Full Retention Interceptor can be removed by suction tanker.


Vortex Silt/Oil Seperator: A hydrodynamic vortex separator system designed to separate grit/floating pollutants, oil, debris and contaminated settling solids from Stormwater.  They are usually used up stream of attenuation/holding ponds as a means of pollutant removal.  Full details of how a Vortex Silt/Oil Separator like the BMS Stormbreaker Defender functions can be found on the Stormbreaker Defender Page.

Project Gallery

Project Gallery

250 l/s BMS Stormbreaker Defender Vortex Oil/Silt Seperator on its way to the Mater Hospital

Project Details


Dec 2012


FIMA Developments Ltd (Groundworks Contractor)


Malachi Cullen & Associates, Old Bridge House, Strand Street, Athlone, Co. Westmeath, Ireland.


FIMA Developments were the main groundworks contractors during a major redevelopment of the Mater Hospital, Dublin.  Part of the upgrade involved installing a new car park.  FIMA needed a solution that could remove silt/oil from a large surface water flow of up to 250 l/s before connecting it to an existing on site attenuation system.


€15,000 +