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Compact tower worksheet

Wind turbine tower manufacturers: sourcing brief

This sourcing brief keeps tower steel, flanges, and transport on their own lines before wind turbine tower manufacturers are asked to quote. GridAxis Sourcing prepares the questions. It does not design foundations, and it does not treat a turbine family brochure as a tower drawing.

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Lines to keep separate

  • Turbine: rated power and rotor diameter
  • Tower: hub height, sections, flange
  • Controller: voltage and communication
  • Parts: fasteners and brackets
Tower sections and flange sketch on a procurement table

Documents to request with the tower

Ask wind turbine tower manufacturers for files that name the quoted sections. A turbine datasheet does not set plate thickness or bolt circle.

  1. Outline with hub height in m and section count.
  2. Base and intermediate flange dimensions, including bolt circle.
  3. Coating description and any inspection note the buyer requires.
  4. Packed length and weight per section for the US destination.
  5. Statement of what is excluded: foundation, guys, erection, electrical.

Decisions still open after a tower price arrives

Tower choices and the limit of this brief
Choice Record on the RFQ Leave with others
Freestanding tube, guyed mast, or lattice The type, hub height in m, and whether guys are supplied. Soil, foundation, and structural review.
Tower sold with the turbine One line or two, so steel is not hidden inside a machine unit price. Whether that package meets the site setback.
Interface to the nacelle Upper flange and the rotor diameter it must clear. Loads from survival wind speed in m/s, calculated by the engineer.
Unit price versus delivered scope Coating, hardware, freight, and duty basis beside the steel price. No stored pair of quotes, so no savings figure is published.

Compare freestanding tube, guyed mast and lattice proposals against the same hub height and turbine interface. Ask each bidder to state anchor requirements, section dimensions, packed weights, lifting points and access provisions. A guyed proposal needs an explicit anchor footprint; a proposal without guys still needs its foundation loads reviewed. The buyer's engineer decides which arrangement is suitable. Write that decision into the RFQ instead of letting the factory infer it from a turbine name.

Rated power in kW and cut-in wind speed in m/s stay on the turbine line even when the tower is the page you are filling. Controller enclosure rating and any SCADA point stay on the controller line. The inquiry catalog and the procurement note hold the machine fields. Application notes explain why the site context changes hub height.

Submit the tower scope

Include hub height, section plan, flange notes, quantity of towers, destination, and requested timing. Add currency and a per-unit or whole-order budget if you have a ceiling. Preference may be high-end, mid-range, budget, or not yet decided.

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