OlioSep™ sizing
Oil/water separator sizing for repair garages
Enter the number of service bays that drain to the separator. You get the flow it needs and the OlioSep™ size we would quote.
Washing vehicles with detergents? Detergents can emulsify oil, and a gravity separator cannot break a stable emulsion. Say so in the request below and we will check what treatment you need.
Bay-by-bay sizing
| Bays | Calculated flow (US GPM) | OlioSep™ size | Model |
|---|---|---|---|
| 1 | 19.81 | 25 GPM | ER-840025 |
| 2 | 34.07 | 50 GPM | ER-840050 |
| 3 | 48.33 | 50 GPM | ER-840050 |
| 4 | 62.59 | 75 GPM | ER-840075 |
| 5 | 76.85 | 100 GPM | ER-840100 |
| 6 | 91.11 | 100 GPM | ER-840100 |
| 7 | 105.37 | 150 GPM | ER-840150 |
| 8 | 119.63 | 150 GPM | ER-840150 |
| 9 | 133.89 | 150 GPM | ER-840150 |
| 10 | 148.15 | 150 GPM | ER-840150 |
| 11 | 162.41 | 200 GPM | ER-840200 |
| 12 | 176.67 | 200 GPM | ER-840200 |
| 13 | 190.93 | 200 GPM | ER-840200 |
| 14 or more | 205+ | Larger unit, separators in parallel or custom | |
Method: the practice used in Québec (CMMTQ technical sheet PL-15, from the former Québec Plumbing Code): 1.25 L/s (19.81 US GPM) for the first bay, plus 0.9 L/s (14.26 US GPM) for each additional bay, rounded up to the next OlioSep™ size. It is accepted practice, not a code formula: your municipality, your engineer or the manufacturer's recommendation take precedence.
Industrial process, stormwater or anything other than a repair garage: use the full sizing request below.