Oil Water Separator - Klargester has a specialist team who provide technical assistance in selecting the appropriate Separator for your application

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Courtesy of Kingspan Environmental Ltd

Klargester Separators - EN858 compliant, with full Environment Agency Approval (PPG3)

To specify a nominal size Klargester Bypass Separator, the following information is needed:-

  • The calculated flow rate (NS) or the drainage area served. Our designs are based on the assumption that any interconnecting pipework fitted elsewhere on site does not impede flow into or out of the separator
  • The required discharge standard. This will decide whether a Class 1 or Class 2 unit is required
  • The drain invert inlet depth
  • Oil alarm system available
  • Pipework type, size and orientation

Bypass Separator NSB Range

Bypass separators are used when it is considered an acceptable risk not to provide full treatment, for very high flows, and are used, for example, where the risk of a large spillage and heavy rainfall occurring at the same time is small .e.g.

  • Surface car parks
  • Roadways
  • Lightly contaminated commercial areas

Operation

100% of the liquid, up to the unit's designated flow passes through both chambers of the unit. The separation chamber retains the lighter than water pollutants, oils and petrol which rise to the surface. These pollutants are stored within the separator. The separated water discharges from the unit by gravity. If the flow rate rises above NS rating i.e. up to 10 x the NS rating (peak flow) the excess flow is diverted by a bypass arrangement and discharged without passing through the separation chamber. This ensures that excess flows will not cause 'wash out' of stored pollutants.

Features

  • Light and easy to install
  • Comprehensive range
  • Independently tested and performance sampled, certified by the BSI
  • Class 1 and Class 2 designs
  • Inclusive of silt storage volume
  • Rapid availability
  • Fitted inlet/outlet connectors
  • Vent points within necks
  • Extension access shafts for deep inverts
  • Maintenance from ground level

Performance

Klargester are the first UK manufacturer to have the required range certified to NSB in the UK. The NSB code denotes the flow at which the separator operates and is only able to be applied to products which have been independently tested and certified. The British Standards Institute (BSI) have tested the required range of Klargester separators and have certified their performance in relation to their flow and process performance.

Each bypass separator design includes the necessary volume requirements for:

  • Oil separation capacity
  • Oil storage volume
  • Still storage capacity
  • Coalescer (class 1 units only)

The unit is designed to treat 10% of peak flow. The calculated drainage areas served by each separator are indicated according to the formula given by PPG-3 NSB= 0.0018A(m²). Flows generated by higher rainfall rates will pass through part of the separator and bypass the main separation chamber.

Class 1 separators are designed to achieve a concentration of 5mg/litre of oil under standard test conditions.

Class 2 separators are designed to achieve a concentration of 100mg/litre of oil under standard test conditions.

Full Retention Separator NS Range

Full retention separators are used in high risk spillage areas such as:

  • Fuel distribution depots
  • Vehicle workshops
  • Scrap Yards

Operation

Contaminated water enters the unit, the internal design and configuration ensures that the liquid is retained for a sufficient period to ensure quiescent conditions within the separator. Lighter than water pollutants, such as oils and petrol, rise to the surface of the water and are retained within the separator.

Separated liquid discharges. An automatic closure device seals off the outlet when the retained oil reaches the pre-determined level. Retained oil must be emptied from the unit once the level of oil is reached and the closure device is operated.

To specify a nominal size Klargester Full Retention Separator, the following information is needed:-

The calculated flow rate (NS) or the drainage area served. Our designs are based on the assumption that any interconnecting pipework fitted elsewhere on site does not impede flow into or out of the separator
The required discharge standard. This will decide whether a Class 1 or Class 2 unit is required
The drain invert inlet depth The difference between the drain invert depth and the minimum invert (F) above rounded up to the nearest half metre, is the length of extension shaft(s) needed

  • Oil alarm system available
  • Pipework type, size and orientation

Performance

Klargester are the first UK manufacturer to have the required range certified to NS in the UK. The NS code denotes the flow at which the separator operates and is only able to be applied to products which have been independently tested and certified. The British Standards Institute (BSI) have tested the required range of Klargester separators and have certified their performance in relation to their flow and process performance.

Each full retention separator design includes the necessary volume requirements for:

  • Oil separation capacity
  • Oil storage volume
  • Still storage capacity and incorporating a Coalescer (class 1 units only)
  • Coalescer
  • Automatic closure device

Klargester full retention separators treat the whole of the specified flow.

Features

  • Light and easy to install
  • Comprehensive range
  • Independently tested and performance sampled, certified by the BSI
  • Class 1 and Class 2 designs
  • Inclusive of silt storage volume
  • Rapid availability
  • Fitted inlet/outlet connectors
  • Vent points within necks
  • Extension access shafts for deep inverts
  • Maintenance from ground level
  • Washdown Separators

Features

  • Light and easy to install
  • Comprehensive range
  • Inclusive of silt storage volume
  • Rapid availability
  • Fitted inlet/outlet connectors
  • Vent points within necks
  • Extension access shafts for deep inverts
  • Maintenance from ground level
  • Washdown Separators

This unit can be used in areas such as car wash and other cleaning facilities that discharge directly into a foul drain, which feeds to a municipal treatment facility.

If emulsifiers are present the discharge must not be allowed to enter a NS class 1 or class 2 unit.

Operation

As contaminated water passes through the separation chamber, it is retained long enough to allow immiscible hydrocarbon pollutants, such as oils and petrol to accumulate on the surface of the water and settleable solids to sink to the bottom of the unit.

Our design uses a maximum of 6 minutes retention time, at the flow rate given. The separator waste is able to discharge safely without the risk of oil pollution to the municipal plant. It is generally accepted that greatest separation efficiency for oil is gained by using a single chamber separator as the pollutants have more time to separate.

The nature of silt varies depending on either the ground or surface receiving the flow. These aspects should be considered when selecting the size of unit in relation to the flow being treated.

Performance

Separators serving wash-down areas such as car wash and other cleansing facilities must discharge directly into a foul drain, which feeds to a municipal treatment facility.

Such wash-down facilities must not be allowed to discharge directly into either surface water or any oil/water separator discharging into a surface water as they utilise emulsifiers, soaps and detergents, which can dissolve and disperse the oils and upset the separation process.

Forecourt Separator

Features

  • Light and easy to install
  • Comprehensive range
  • Inclusive of silt storage volume
  • Rapid availability
  • Fitted inlet/outlet connectors
  • Vent points within necks
  • Extension access shafts for deep inverts
  • Maintenance from ground level

Performance

Operation ensures that the flow cannot exit the unit without first passing through the coalescer assembly.

In normal operation, the forecourt separator has sufficient capacity to provide storage for separated pollutants within the main chamber, but is also able to contain up to 7,600 litres of pollutant arising from the spillage of a fuel delivery tanker compartment on the petrol forecourt. The separator has been designed to ensure that oil cannot exit the separator in the event of a major spillage, subsequently the separator should be emptied immediately.

Installation

The unit should be installed on a suitable concrete base slab and surrounded with a concrete backfill. Structural grade units can also be supplied suitable for installation within a granular backfill (i.e. pea gravel). Please specify unit required when ordering. If the separator is to be installed within a trafficked area, then a suitable cover slab must be designed to ensure that loads are not transmitted to the unit.

The separator should be installed and vented in accordance with Health and Safety Guidance Note HS(G)41 for filling stations, subject to Local Authority requirements.

Forecourt Separators

The separator is designed for installation in petrol filling station forecourts and similar applications where there is a requirement for the separator to contain the spillage from a road tanker. The function of the separator is to intercept hydrocarbon pollutants such as petroleum and oil and to prevent their entry into the drainage system, thus protecting the environment against hydrocarbon contaminated surface water run-off and gross spillage.

Applications

The forecourt separator is designed for installation in petrol filling station forecourts and similar applications. The function of the separator is to intercept hydrocarbon pollutants such as petroleum and oil and prevent their entry to the drainage system, thus protecting the environment against hydrocarbon contaminated surface water runoff and gross spillage.

  • Car wash
  • Tool hire depots
  • Truck cleansing
  • Construction compounds cleansing points

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