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Figure 5
where a lower quality requirement applies, such as discharges to the foul sewer (but check first with your sewer provider).
Both classes can be produced as full retention, bypass or forecourt separators. Full retention separators/interceptors treat the full flow that can be delivered by the drainage system. The full flow is normally equivalent to the flow generated by a rainfall intensity of 65 mm/hour. They can be used in car parks, roadways, fuel distribution depots, vehicle workshops and forecourts. A bypass separator/interceptor is a tank
used in low risk areas, such as a car park or roadway, and they are designed to treat the first 10% of surface water runoff. In cases where a large spillage might be likely to occur, it is not acceptable to use a bypass separator. Full retention separators/interceptors are used
where there is a risk of regular contamination with oil and a foreseeable risk of significant spillages, such as vehicle maintenance areas and retail fuel forecourts. Forecourt separators/interceptors are full retention separators specified to retain on site the maximum spillage likely to occur at a petrol filling station. They are required for both safety and environmental reasons, and will treat spillages occurring during vehicle refuelling and road tanker delivery. It is important to install a forecourt separator/
interceptor of an appropriate size. On a forecourt where tanker deliveries are received, a separator/ interceptor with an oil storage capacity of 7,600 litres will meet the requirements of BS EN 858-2, clause 4.3.6. If a smaller unit is proposed, the size should be determined by undertaking a
Figure 6
risk assessment incorporating catchment size, potential spillages during delivery, and other risks such as safety issues. If the compartment size of the tanker that delivers to your site is greater than 7,600 litres, your separator/interceptor should be sized accordingly. Prior to installing an oil separator/interceptor, the Environment Agency should be contacted to ensure that the correct category of equipment is being installed (see Figure 6 above). In this series, we have introduced DSEAR
and given a brief insight into the risk assessment and reduction process. A simplified process flow chart of this can be seen in Figure 7 below. It is not comprehensive or inclusive of all factors considered as part of the risk assessment process; such an assessment must be undertaken by competent and qualified persons only and in accordance with the regulations
Marcus Rees is fire risk consultant and lead DSEAR assessor at the FPA. For more information, view page 3
For further information or advice on this topic, please email
fireriskassessments@thefpa.co.uk
Figure 7
www.frmjournal.com MAY 2020 51
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