Wind Energy

The lattice masts installed by ISTOS RENEWABLES have been developed by experienced engineers. The static sufficiency has been studied in accordance with:

• Eurocode 3: Design of steel structure (ΕΝ 1993)

• Eurocode 1: Actions on structures (ΕΝ 1991)

Strength*

MODEL	Height	Material	Strength against wind gust at the top of the mast*	Ice thickness**
N-500	42m	S-355	97m/s	No Ice
			60m/s	12.5mm
			45m/s	25mm
	60m	S-355 with reinforcement brackets	79m/s	No Ice
			49m/s	12.5mm
			37m/s	25mm
	80m	S-355 with reinforcement brackets	68m/s	No Ice
			42m/s	12.5mm
			31m/s	25mm

MODEL	Height	Material	Strength against wind gust at the top of the mast*	Ice thickness**
	42m	S-355 with reinforcement brackets	122m/s	No Ice
			75m/s	12.5mm
			56m/s	25mm
	60m	S-355 with reinforcement brackets	100m/s	No Ice
			61m/s	12.5mm
			46m/s	25mm
	80m	S-355 with reinforcement brackets	85m/s	No Ice
			51m/s	12.5mm
			39m/s	25mm

Technical Specifications

• Weight of a 4m section: 60 kg (approx)

• Steel grade: S355 for 60mm tubes (with tensile test certificate by accredited lab)

• Treatment: electrolytic zinc plating after welding

• Final treatment: electrostatic paint in colours UV resistant and compliant with Civil Aviation Agency demands (Red & White).

Design & Development

For the realization of the strength study, a 3D F.E. model of the lattice mast was constructed, on which were placed the restrictions and the loads (gravity, ice and wind).

Stresses were calculated and evaluated (Nastran solver) to determine the static sufficiency of the structure.

Apart from the lattice elements and wire-ropes as an assembly, simulations of significant parts (component analysis) have been carried out, like as guy-wire adaptor plates, base of erection. By this way, the risk of ignoring a weak point is eliminated.

Construction and Quality Control

• The construction of our Lattice masts is carried out in our local factory based on our construction standards under our full supervision.
• The tubes and welds of our lattice masts are subjected to quality control by an accredited laboratory