QED Passive Skimmers

Passive Skimmers have been designed for product-only (LNAPL) recovery applications in sites where active pumping systems are not applicable due to existing conditions or extreme low permeable formations. The floating intake head follows the groundwater fluctuations in the recovery well, allowing only the free-floating phase (LNAPL) to be captured without taking water and stored in the built-in reservoir for further manual transfer to a tank.

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Key Features

Available for 2” (50 mm) and 4” (100 mm) extraction wells, with different reservoir capacities
SOS-P (Passive Selective Product Skimmer)
- Reduces product level to a sheen
- Floats on product water interface
- Centering disks prevents float from contacting sidewalls of well
SPG-P (Passive Specific Gravity Product Skimmer)
- Viscous products 200-1000 Centistokes
- Hydrocarbon has a specific gravity less than .85
- Floats slightly above product-water interface

Benefits

Simple systems for extreme low recovery applications
Choice of floating inlet types
Multiple Canister sizes
Stainless steel product recovery canisters

Specifications

Model No.

2 in. SOS – 301079

2 in. SOS – 301080

4 in. SOS – 301032

4 in. SOS – 301033

Canister Volume

600 cc

900 cc

3,000 cc

6,000 cc

Well Diameter

5 cm

10 cm

Float Travel Range

30 cm

46 cm

Overall Length

165 cm

194 cm

177 cm

217 cm

Maximum Fluid Depth Required

98 cm

128 cm

95 cm

137 cm

LNAPL Fluid Density

< 1.0 SG

Kinematic Viscosity @ 50 ˚F (10 ˚C)

200 centistokes

Recommended Initial LNAPL Layer

> .64 cm

Residual LNAPL Layer

Sheen

Suitable Types of LNAPL

Gasoline, jet fuel

Materials

Stainless steel, Viton®, PVC, brass, closed cell foam.

Measurement principle

Ultrasonic cross correlation (flow velocity)
Hydrostatic (depth measurement)

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Key Features