Fuel/Oil Separators

Fuel/Oil Separators


The efficient solution for oil or fuel contaminated wastewater

Fuel/Oil Separators or interceptors (the terms can be used interchangeably) are used to protect water bodies and sewer systems from light fluids¹.  MACTRAP Fuel/Oil separation systems intercept mineral oils and fuels collected in wastewater from sources such as petrol stations, car washes, vehicle repair garages and industry.  These oil and fuel separators are amongst the safest and most effective light fluid capture systems available.

Fuel/Oil Separators can be used:

  • For the treatment of rainwater contaminated with light fluids from surfaced areas.
  • As a retaining system for light fluids where light fluids are handled.
  • For the treatment of dirty water contaminated with light fluids.
  • For the treatment of waste water produced by vehicle wash bays.
¹ Light fluids refers to fluids of mineral origin with a density of ≤ 0.95 g/cm3, which are insoluble or only slightly soluble in water, and which are non-saponifiable.

Wastewater enters the separator and the heavier sludge and sediment sink to the bottom of the chamber while at the same time the light fluids rise to the surface. Cleaned wastewater exits the separator without allowing any of the separated sludge or light fluids to leave the separating chamber.

Coalescence Separators

Coalescence Separators operate on the same principle as Fuel/Oil Separators. A coalescence filter is integrated into the system to catch droplets of oil too small to separate from the wastewater. Fine droplets of oil are trapped by the filter where they combine with other fine droplets until they reach buoyancy, and rise to the surface.

Self activated closure lock

Both the fuel/oil and the coalescence separators are equipped with a self-activated closure lock which completely closes the outlet of the separator when the separator reaches its maximum fuel/oil storage volume. This prevents the escape of light fluids into the drainage system.

Alarm units

To reduce the chances of the separator shutting down due to overcapacity in the fuel/oil storage chamber, an alarm unit can be installed which monitors the fuel/oil level.  MACTRAP recommends the installation of these alarm units in high fuel/oil applications.


MACTRAP manufactures fuel/oil separators in New Zealand and they are available in sizes from 250L to 6000L

The Polymer material used is resistant to bioethanol and biodiesel and particularly durable.

We provide a 30-year inground warranty for impermeability, fitness for use and structural stability.


Our KESSEL Coalescence Separators are available with nominal sizes NS3 to NS15.

Emergency float switch. This emergency system prevents the leakage of light liquids into the sewer pipe.

Optional, automatic layer thickness measuring of the oil and sludge layer thickness in coalescence and fuel/oil separators.


Coalescence Separator


Oil Storage


Total Volume


NS3 – 99 503.10 (B) (D) EX 215 1800
NS6 – 99 506.10 (B) (D) EX 380 4300
NS6 – 99 506.10 (B) (D) EX 470 5800
NS10 – 99 510.10 (B) (D) EX 267 2600
NS10 – 99 510.10 (B) (D) EX 380 4300
NS10 – 99 510.10 (B) (D) EX 470 5800
NS15 – 99 515.10 (B) (D) EX 470 5800


Treatment Capacity


Data Sheet


MTFO250 (S) (A) (D) 252 Data Sheet 250L
MTFO500 (S) (A) (D) 515 Data Sheet 500L
MTFO750 (S) (A) (D) 726 Data Sheet 750L
MTFO1000 (S) (A) (D) 946 Data Sheet 1000L
MTFO1500 (S) (A) (D) 1550 Data Sheet 1500L
MTFO2000 (S) (A) (D) 1980 Data Sheet 2000L
MTFO2500 (S) (A) (D) 2460 Data Sheet 2500L
MTFO3000 (S) (A) (D) 2940 Data Sheet 3000L
MTFO6000 (A) (D) 5670 Data Sheet 6000L

Covers & Risers

Mactrap separators are available with Class D Vehicular lids in cast iron, and Class A Pedestrian lids in HDPE.

Flexible coupling allows easy installation into the surrounding medium.

The risers and covers are fully sealed.

The riser mounts are pre-welded and the riser flanges and screw on lids are provided separately. The riser flanges and screw on lids are installed once the exact height of the installation is known. The risers can be cut on site to the required height.

Surrounding concrete or other medium must be engineered for the appropriate loading.

Further Information

Wash Bay Brochure

Support • Information • Design • Sizing

Need Help?