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Case Study - Can a skimmer be installed in a waste water sump under a highway

 

Background:

In an area of heavy traffic there is a risk of oil, diesel and fuels from general traffic and accidents getting into the drainage system and polluting run off water.  To prevent this pollution, a Vikoma skimmer was installed in a sump, 10m below ground level to collect oil and discharge to a road tanker.  With a high oil content (98%), the volume of liquid collected is kept to a minimum, keeping road tanker costs much lower than other solutions where significantly more water is collected by the tanker.

Oil on sump - Lude oils, hydraulic oil and Naphtha.

Sump area classification - Zone 2.

Problem - The drainage sump is located 10m below ground level and there is a large volume of traffic in the area and this leads to a risk of spillage, diesel and oil etc. polluting run off water.

Objective:

Customer objective 1: The recovered oil must be able to be pumped directly to a road tanker for disposal.

Feedback: Skimmer system designed so that the recovered oil can be discharged directly into a road tanker.

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Customer objective 2: The skimmer must have a high recovery capability in case of a major spill.

Feedback: Skimmer capacity of over 9m3/hr. 

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Customer objective 3: The recovered oil must have a minimal water content.

Feedback: 98% oil with typically 2% water achievable.

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Customer objective 4: The skimmer must operate safely and reliably within the confined space of the sump in the presence of hydrocarbon vapours.

Feedback: Skimmer certified to zone 2 for hazardous operating areas.

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Customer objective 5: The skimmer must pass through a 600mm x 750mm access hatch to the sump.

Feedback: A modular skimmer was designed capable of being dismantled and put in teh sump and reassembled.

Solution:

Vikoma installed a T9 floating oil skimmer system located in a sump 10m below ground.  The skimmer was powered by a electro-hydraulic powerpack unit.  The recovered liquid, with 98% oil content is discharged to a road tanker.

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