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For inspection purposes only. Consent of copyright owner required ...

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Separator Range<br />

The use <strong>of</strong> an oil/water separator is <strong>required</strong> wherever there is<br />

the risk <strong>of</strong> hydrocarbon pollutants causing contamination at the<br />

point <strong>of</strong> discharge, i.e. an open ditch, river/stream, stormwater<br />

or foul sewer. Normally the interceptors are made <strong>of</strong> GRP or<br />

PVC, which need to be installed on a reinforced concrete base,<br />

filled with water and then encased in concrete. This can be a<br />

slow and expensive method <strong>of</strong> installation.<br />

Our interceptors are manufactured from precast concrete, and<br />

are normally installed on a bed <strong>of</strong> cl804 stone and backfilled<br />

with the excavated material. This results in considerable<br />

savings on time and materials. Our service also includes<br />

delivery to site and <strong>of</strong>f-loading into position.<br />

Design<br />

In principle, we design to four basic classifications; Full<br />

Retention, Bypass, Class I and Class II. Classes I and II<br />

pertain to the Eurocode ISEN858 (Separator Systems for Light<br />

Liquids Pt. 1)<br />

Our designs comply with the requirements <strong>of</strong> the EPA<br />

Wastewater Treatment Manuals:-<br />

- Preliminary Treatment: Part 5: Oils, Grease and Fats<br />

- Primary Secondary and Tertiary Treatment: Part II<br />

- IS EN858 Part1<br />

All <strong>of</strong> our products are engineered to the customerʼs<br />

requirements, using established design parameters. The<br />

designs are based on flow speeds, retention times,<br />

temperature and the settlement characteristics <strong>of</strong> the target<br />

materials. The tank structures are designed to BS8110,<br />

BS8007 and the Dramix Design Guidelines for Steel Fibre<br />

Reinforced Concrete Structures.<br />

Description <strong>of</strong> basic type - Class I & II<br />

The European Standard EN 858-1 refers to two classes <strong>of</strong><br />

separator and the performance results achieved under<br />

standard test conditions.<br />

Class 1 Separator<br />

This type <strong>of</strong> unit is <strong>required</strong> where the hydrocarbon pollutant<br />

* Licence from Local Authority is <strong>required</strong><br />

CARLOW PRECAST<br />

Concrete Engineering<br />

concentration in the liquid discharging from the separator must<br />

be 5 mg/l or less, or where discharge is to sensitive waters.<br />

Class I units contain a coalescing filter which prevents<br />

passage <strong>of</strong> oil droplets, found in suspension in the liquid,<br />

through the system. Class I units also contain an emergency<br />

closure device. In the event <strong>of</strong> a major spillage, exceeding the<br />

max. oil storage capacity <strong>of</strong> the separator, the closure device<br />

will shut-<strong>of</strong>f the outlet flow. The pollutants are contained within<br />

the separator, thus preventing downstream contamination.<br />

Class II Separator<br />

This type <strong>of</strong> unit is <strong>required</strong> where the allowable hydrocarbon<br />

concentration is less than 100 mg/l. They are used where the<br />

effluent quality requirements are less stringent, but there is still<br />

a need to protect the environment by shutting the system down<br />

in the event <strong>of</strong> a spillage. Class II separators are also provided<br />

with an emergency closure device.<br />

Full Retention Separators<br />

Full retention separators are used in areas where there is a<br />

high risk <strong>of</strong> hydrocarbon/oil spillage. The full flow <strong>of</strong> the<br />

drainage system is treated, normally equivalent to rainfall <strong>of</strong><br />

65mm/hr.<br />

Bypass Separators<br />

Bypass separators fully treat all flows generated by rainfall<br />

rates up to 6.5mm/hr. This covers 99% <strong>of</strong> all rainfall events.<br />

Flows above this rate are allowed to bypass the separator. This<br />

type <strong>of</strong> separator is applicable to low risk areas such as car<br />

parks, motorways etc.<br />

<strong>For</strong>ecourt Separators<br />

<strong>For</strong>ecourt separators are designed specifically for filling<br />

stations, in order to retain the maximum spillage from a tanker<br />

compartment <strong>of</strong> up to 7,600litres<br />

<strong>For</strong> <strong>inspection</strong> <strong>purposes</strong> <strong>only</strong>.<br />

<strong>Consent</strong> <strong>of</strong> <strong>copyright</strong> <strong>owner</strong> <strong>required</strong> for any other use.<br />

Separator Selection<br />

The flowchart below will provide a guide to the selection <strong>of</strong> the<br />

correct separator type for a particular drainage application.<br />

15 Year Guarantee & Manufacturers All Risk Insurance<br />

Email: separators@carlowprecast.com Direct Line: R.O.I. 059 915 9550 / U.K. 0870 493 1408<br />

EPA Export 24-08-2012:23:55:54

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