15
PROCEPTOR®
TECHNICAL MANUAL
3.4 OIL SEPARATORS
3.4.1 SIZING GUIDELINES
STEP 1: Determine the Flow Rate
Determine peak flow rates (Q): add up all fixtures (e.g., hose bibs) and other sources of liquid discharge to oil separator and
establish peak flow rate.
If fixture quantity and/or volume are unknown, assume worse case scenario by establishing peak flow rate based on drain size
connecting to oil separator. (For example: 4 in drain at 1/4 in/foot or 2mm/100mm = 110 gpm (US))
STEP 2: Determine the Retention Time Required
In order to meet the 10 mg/l effluent discharge regulation enforced by most pre-treatment authorities, Proceptor requires the
following retention times (HRT):
• 10 minutes retention for non-emulsified oil
with
the use of a coalescer
• 30 minutes retention for non-emulsified oil
without
the use of a coalescer
• 60 minutes retention for light emulsified oil (mechanical mixing)
STEP 3: Calculate the Size of the Proceptor
Multiply the peak flow rate
(Q)
by the hydraulic retention time
(HRT)
to determine the volume of the separator
(V)
V = Q x HRT
STEP 4: Choose a Proceptor Size
Choose the Proceptor size equal or closest to the value of V. Please refer to Oil Separator Sizing Chart in Section 0.
For example:
1 Spills containment 10 US gpm of potential flow from spills
Scenario 1: 10 US gpm x 10 min. = Proceptor OMC 100 US gallon
wit
h a coalescer
Scenario 2: 10 US gpm x 30 min = Proceptor OMC 300
without
coalescer
2 Mechanics shop rinsing floor lightly with soap and using two (2) 1/2” hose bibs = 2 X 5 US gpm = 10 US gpm (30 psi)
Scenario 1 (if continuous flow exist for more than 60 minutes): 10 US gpm x 60 min. = Proceptor OMC 750 US gallon
Scenario 2 (if it is a batch flow where wash time is less than 60 minutes): Wash time = 30 minutes, 10 US gpm x 30 min.
wash time = Proceptor OMC 300 without coalescer
If flow rate is unknown, assume worse case scenario by establishing peak flow rate based on size of drain size connecting
to the oil separator. For example: 4in drain at 1/4 in/foot = 110 gpm).
