Delivery and cargo handling of flat blanks for wind turbine towers

Below is the brief description of delivery preparation process for flat blanks, the most important component of wind turbine tower.


1. Shipment of flat blanks from the shipyard warehouse.

By means of gantry crane, at the shipyard warehouse ready-made flat blanks are loaded on 50 mt flat cars and shipped to the wharf. Representatives of shipping terminal are obligatory present during loading of flat blanks at the shipyard warehouse. The scope of their responsibilities includes counting the blanks and inspection for surface defects (oil stains, scores, dents, mechanical damage). Should any of these defects be detected, damaged products are returned to the shipyard for finishing or detect removal.

2. Storage of flat blanks in the port.

At the port warehouse flat blanks are stored in the open area and stockpiled duly separated with 100x100 mm wooden bars, the number of which should conform to the requirements of storage conditions for flat rolled steel and its length.

During storage period special storage conditions are strictly observed by the port staff, such as not allowance of ingress of oil to the parts or any mechanical damage.

3. Preparation for loading of blanks to the vessel.

Before loading of parts to the vessel, they should be accepted on the wharf by the independent surveyor. His tasks include counting the blanks, inspection for surface defects (oil stains, dents, mechanical damage). If defects are discovered, the damaged blanks are removed and returned to the shipyard.

All the necessary lashing and dunnage materials are supplied to the wharf in sufficient quantities to provide flat blanks fixing in vessel’s holds. All the fixing devices comply with the normative technical requirements and have test certificates confirming their strength parameters.

4. Fixing of vessels for shipment of flat blanks.

For shipment of flat blanks we typically use vessels with vertical boards of the hold, deck-pillars, counters or twin-decks (vessels with box-type holds).

5. Loading of flat blanks onto the vessel.

No more than 2 sets can be lifted simultaneously and their weight should not exceed the crane capacity. Depending on the type of the cargo, mobile, stationary and floating cranes are engaged. 

The scheme of sets stowage in holds and their height is determined depending on the type of vessel and holds.

On the pier wooden bars are put on top of each bundle, so that in the hold each next bundle is placed on another only upon tier of separation.

6. Securing flat blanks in the hold of the vessel.

After all the flat blanks are properly placed and stowed in the holds, all sets (or only upper sets) should be duly secured  -  up to vessel’s Master satisfaction.

Securing is done with bars, “SIGNOD” belts and ropes – at the discretion of vessel’s authorities. Also all butt ends sets are wedged with wooden bars.

If clearance between tiers is small, standard bars are used; if the clearance is rather big, a cage of the required shape is made up from bars. Bars are also put along the edges of blanks to avoid their damage.

Then the cargo is tied up with ropes, lanyards or belts; for final securing of securing wedges are put in the stockpiles.  




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