Offset Type

ATECO – OFFSET TYPE Series, designed for use on storage tanks where there is a need to draw off product from just below the surface of liquids stored in bulk.


This unit safeguards the quality of product drawn off from the tank and substantially reduces settling times. Although the ATECO SWING Series Floating Suction Unit was riginally designed specifically for use in tanks storing aviation fuel where a water and sediment free product is essential, their application has gradually extended throughout other industries.

Jet fuel quality is maintained by regular filtration and checks at all points and stages in its transfer to the airfield. The floating suction unit is but one of a large number of safeguards to ensure fuel quality and safety in air transport. Not only is water contaminated fuel a hazard to jet engine operation, but its presence also promotes the growth of bacteria and fungi which in turn can contaminate and block filters, and cause the fuel to be hazy and out of specification.

Sediment in finished fuel can suspend on the hydrocarbon/water interface and be sucked into the fuel upon transfer. By minimizing water, sediment and bacteria, the ATECO SWING Series Floating Suction Unit can help provide a consistent high quality fuel and reduce the time required for filtering, hydrotreating or increased settling time between shipments. It can also help jet, diesel and aviation fuel meet color, filterability and haze specifications.

The AKTEK ATECO SWING X5 Series Floating Suction Unit is ideal for use in crude storage applications where water is present. Bacteria are becoming more prevalent in crude oil due to down-hole water injection and water reuse practices in separation facilities. More water to the crude unit backs out crude from the refinery. Increased sediment and bacteria can upset downstream equipment. These conditions may result in a loss in refinery production. The floating suction unit can help provide a consistent high quality fuel by minimizing water, sediment and bacteria which results in an increase in refinery production.

SWING JOINTS: Aluminum , Steel, or special alloys for chemical and other applications ; Flanged dual ball bearings type with O-Ring seals or central type with bronze or Ni-Resist bushings.

PIPE OR TUBING: Aluminum, steel or special alloys for chemical and fuels, treatment plant decant applications ; lenghts and sizes are dependent on particular installation requirement; available in 2” throught 36” pipe or tubing

BELLMOUTH: Low velocity conical configuration with baffle plate and anti-vortex plate. Basic styles : Model X5-A with 90° bell-mouth elbow; Model X5-C with 45° bellmouth elbow and inverted bellmouth for skimming units.

FLOATS: Stainless Steel or Aluminium and alla re pressure tested. 

BAFFLES AND STOP LEG: Aluminium , steel, iron or special alloys for chemical and other applications ; designed to break
suction 9” above tank bottom ( or as specified )

INSPECTION CALBE: 3/16” uncoated Stainless Steel ( Ground to Arm )

Key Benefits

  • Sizer Range 3”-36”.
  • Choice of Material Available.
  • Top Center of Bottom Outlet
    Configurations are Available.
  • Durable Construction.
  • Configurations make it suitable for
    vertical and Horizontal Tanks
  • Use of High Quality Swivels.
  • Single-Double-Trible Arm.
  • Iron Swivels are Nickel Plated
    For Superior Corrosion Resistance.
  • Efectively Bufflet to Avoid Vortex Formation.

Design Features

  • To ease installation, all component parts of the Floating Suction Unit can pass through a standard tank shell manhole.
  • The arm can not lock in a vertical position – this can be important if the tank diameter is less than the height a stainless steel restraining chain is attached to the upper end of the pipe.
  • The Floating Suction Unit is installed in a fixed position, air is not trapped in the arms during tank filling – at the highest point a hole is drilled in the pipe to allow air to escape.
  • Long life and trouble free operation is maintained due to the use of swivel joints specifically designed for submerged service.
  • At low level, the Floating Suction Unit is located on supports – this avoids the pipe work resting in any sediment on the bottom of the tank.
  • The floatation chambers are designed such that if one is punctured the remaining one can keep the unit floating.
  • The Floating Suction Unit can be installed and operated in a fixed roof, external floating roof and an internal floating roof tank.
  • Because the product is always taken from the top surface and is less likely to be contaminated, this decreases the maintenance of filters in the draw-off lines.
  • The Floating Suction Unit is custom designed, taking into consideration the specification of the stored product and operational requirements of the tank.

Ateco Tank Leaflet
Ateco Tank Sample Project
Ateco Tank Metarial Specification
Ateco Tank Summary Specification
Ateco Tank Typical Drawings
Ateco Tank General Specification