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FAQ's - Separators

This section provides answers to many frequently asked questions on separators.
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Separators
	What is the difference between Full Retention and Bypass units? Full Retention Separators treat the full flow that can be delivered by the drainage system, (normally equivalent to a flow generated by a rainfall intensity of 50mm/hr). Bypass Separators treat all flows up to 5mm/hr. This covers up to 99% of all rainfall events. Flows above this rate are allowed to bypass the separator.

Separators

Where can they be discharged to?

Separators (by design) fall into two categories, depending on where they can discharge to:

Class I separators are able to discharge to a surface water drain, or a soakaway.

Class II separators must usally discharge to a foul sewer; each subject to environmental regulator - EA / SEPA / NIHS or water authority consent.

Separators
	Are they a complete unit? All Klargester Separators are supplied as complete units.

Separators

Do they come with covers?

We do not supply manhole covers and frames with our separators.

Manhole covers and frames to cover a particular application can be purchased from any good builders merchant.

Separators

Should an alarm be fitted?

Pollution Prevention Guideline number 3 (PPG3) issued by the EA states that an oil level alarm is recommended.

However, in 2006 this is likely to change when the new issue of PPG3 is expected to state that alarms are required. Please contact Klargester for clarification if required.

Separators
	What pipework/inverts can we supply? Please consult our product data sheets that are available free or visit our Download Centre

Separators

What maintenance is involved?

Periodic desludging is required approximately every 6 months, depending on usage.

An oil level alarm system can be purchased which gives an alarm condition when the separator is at 90% of its capacity, thereby giving opportunity to arrange desludging before the total capacity is reached.

Klargester strongly recommend that (at minimum) a manual 6-monthly check should also be part of a maintenance schedule.

Separators

How do I vent the unit?

Each Separator has a vent exit pipe mounted in the neck of the tank itself. This pipe will require extending out to an appropriate above-ground atmospheric venting point, but this secondary equipment is not supplied with the Separator unit.

Venting arrangements must meet local requirements and comply with HS(G)41 for filling stations or British Standard Code of Practice BS8301 for other applications.