QED Environmental Systems, Inc

- Automatic Skimmer Pump System

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The AutoSkimmer Pump System automatically recovers LNAPL layers and pumps on demand when the pump is filled. Combining the industry-leading AutoPump with the rugged SPG floating inlet, the AutoSkimmer delivers higher LNAPL flows for wells with very high floating layer recovery rates. The system can then be switched to even higher flow, total fluids pumping by removing the floating inlet. When site conditions call for this approach, nothing beats the AutoPump/SPG inlet combination; both of these technologies have been proven in the field for many years around the world. The AutoPump mechanism means that the pump cycles only when it is filled with LNAPL, reducing air consumption without adding any additional controls or sensors. The SPG inlet includes selectable side inlet ports for versatility in fine-tuning LNAPL intake when the floating layer is reduced in thickness.

  • High flow, automatic operation for recovery wells with high LNAPL recovery rates.
  • Versatile design allows floating inlet removal for conversion to total fluids pumping after the LNAPL later is largely eliminated.
  • Air-powered, intrinsically safe.
  • Built-in ON/OFF control with internal float.
  • Proven reliability and durability.

Choosing the Right AutoSkimmer Pump System
Specific gravity and viscosity are two of the most important properties of hydrocarbons (LNAPL) as far as their mobility in the subsurface. At the same time that these parameters affect the migration of the plume, they also play a very important role in the selection of the right skimmer for the cleanup application.SPG Inlet

SPG Float

The SPG (specific gravity) inlet uses a float with a controlled specific gravity that causes it to float on water but not in the LNAPL. The SPG float has its fluid inlet port positioned near the top so that it is always above water. If the LNAPL layer gets too thin, the SPG inlet will also be above the LNAPL layer and cease recovery of hydrocarbons until more enters the well. To accommodate a range of final LNAPL layer thickness, the SPG float has multiple, variable inlet ports that can be opened or plugged to adjust the level of the inlet port. Why isn’t the SPG always set for the thinnest possible LNAPL layer? The reason is that any float in a small diameter well has a tendency to occasionally stick as liquid levels move up and down, so setting the inlet port too low increases the chance of allowing water to be pumped instead of pumping only LNAPL. So, a trade-off must be made between achieving desired final LNAPL layer thickness and prevention of pumpingwater.

SOS Inlet

SOS Float

The SOS inlet uses a float with an inlet port inside a hydrophobic, or water-rejecting, screen. The hydrophobic screen prevents water from being taken in and pumped to the surface, even if the float occasionally sticks or drags as the liquid level fluctuates. While this is a distinct advantage of the SOS inlet over the SPG type, the SOS inlet screen is more subject to plugging due to potential debris or slimes present in the well. The SOS inlet works best on fresh gasoline and jet fuel spills, and less so on weathered diesel.

  • AutoSkimmer Model: Short AP4-SPG4
  • Maximum LNAPL Recovery Rate: 320 gpd (1,211 Lpd)
  • Float Range: 16 in. (41 cm)
  • Overall Length: 78 in. (198 cm)
  • Minimum Liquid Column: 52 in. (132 cm)
  • Pressure Range: 5-120 psi (0.4-8.5 kg/cm2)
  • High Pressure Option
  • 5-120 psi (0.4-8.5 kg/cm2)
  • Flow Range: 0-0.19 gpm (0-0.72 Lpm)
  • Minimum Well ID: 4 in. (10 cm)
  • Maximum OD: 3.8 in. (9.7 cm)
  • Maximum Depth
  • 200 ft. (60.9 m)
  • Air Supply Pressure (min/max): 40/100 psi (2.7/6.9 bar)
  • LNAPL Fluid Density: < .85 SG
  • Kinematic Viscosity
  • 1-1000 cSt
  • LNAPL Lens Recommended min Starting Thickness
  • > 3 in. (> 7.6 cm)
  • LNAPL Lens Thickness After Skimming
  • 0.8-3.0 in. (2-7.6 cm)
  • Suitable Types of LNAPL: Gasoline, kerosene, etc.
  • Materials: Brass, Tygon, etc.
  • Fitting Type: Quick-connect
  • Hose or Tubing: Available

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