Oil Separators

Carlow Precast interceptors are manufactured from steel reinforced precast concrete 70N and are normally installed on a bed of cl804 stone and backfilled with the excavated material. This results in considerable savings on time and materials. Our service also includes delivery to site and offloading into position.

Design

In principle, we design to four basic classifications; Full Retention, Bypass, Class I and Class II. Classes I and II pertain to the Eurocode ISEN858 (Separator Systems for Light Liquids Pt. 1). All our separator range are certified to EN858 Part 1.

The use of an oil/water separator is required wherever there is the risk of hydrocarbon pollutants causing contamination at the point of discharge, i.e. an open ditch, river/stream, stormwater or foul sewer.

Normally the interceptors are made of GRP or PVC, which need to be installed on a reinforced concrete base, filled with water and then encased in concrete. This can be a slow and expensive method of installation.

Our designs comply with the requirements of the EPA Wastewater Treatment Manuals:

Preliminary Treatment: Part 5: Oils, Grease and Fats Primary Secondary and Tertiary Treatment: Part II IS EN858 Part1

Class 1 Separator

This type of unit is required where the hydrocarbon pollutant concentration in the liquid discharging from the separator must be 5 mg/l or less, or where discharge is to sensitive waters.

Class II Separator

This type of unit is required where the allowable hydrocarbon concentration is less than 100 mg/l. They are used where the effluent quality requirements are less stringent.

Full Retention Separators

Full retention separators are used in areas where there is a high risk of hydrocarbon/oil spillage. The full flow of the drainage system is treated, normally equivalent to rainfall of 65mm/hr.

Bypass Separators

Bypass separators fully treat all flows generated by rainfall rates up to 6.5mm/hr. This covers 99% of all rainfall events.
Flows above this rate are allowed to bypass the separator. This type of separator is applicable to low risk areas such as car parks, motorways etc.

All of our products are engineered to the customer's requirements, using established design parameters. The designs are based on flow speeds, retention times, temperature and the settlement characteristics of the target materials. The tank structures are designed to BS8110, BS8007 and the Dramix Design Guidelines for Steel Fibre Reinforced Concrete Structures.

Description of basic type - Class I & II

The European Standard EN 858-1 refers to two classes of separator and the performance results achieved under standard test conditions.

Separator Selection

The flowchart below will provide a guide to the selection of the correct separator type for a particular drainage application.

Carlow Precast can supply and install the following range of Separators:

Bypass Separators (4.0 - 84L/sec)* Full Retention Separators (3.0 - 60L/sec)* Forecourt Separators (10,000L) Wash Down Separators (3.0 - 80L/sec)* Silt Traps Grease Traps * Larger flow rates and/or special parameters available on request

Advantages of Carlow Precast Separators

Certified to EN858 Part 1 Ease of Installation Manufactured from Concrete 70N Delivered to Site & Installed Suitable for Traffic Loading Speed of Installation Reduced Civil Costs - no expensive concrete backfill 15 Year Structural Guarantee

Forecourt Separators

Forecourt separators are designed specifically for filling stations, in order to retain the maximum spillage from a tanker compartment of up to 7,600litres.