1) Oil Separators for service station forecourts and
manual (HP) car washes
Design Assumption : No car washing will take place when it is raining. Definition
of “forecourt area” is ground area where hydrocarbons (fuel, oil, etc.) can spill or drip within the containment boundaries of the waste-water gutters used to drain these areas.
Pos 1) Calculating the flow rate of wash water
For the FIRST HP washing device …….. ….. 2 l/sec
for every additional HP washing device …… 1 l/sec
multiplied by factor 2 (constant)
For example :
a site has 3 manual wash bays, therefore,
First HP washing device…… .2 l/sec
Second HP washing device…..1 l/sec
Third HP washing device…… 1 l/sec
…………………………………………….
Total…………………………… 4 l/sec ..x factor 2 = 8 litres/second
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