1.1 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Operating Instructions Part 1 – Driving

Serial number

3 112 278 en

12.09.2006

Important note

Duplications of any kind and excerpts from this document are not subject to the revision service. Original documents of Deutsche GROVE GmbH are marked with the blue serial number of the truck crane on the cover sheet.

Duplications and printouts from data carriers on which Deutsche GROVE GmbH has delivered this document are also not subject to the revision service.

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Dissemination or duplication of this document as well as utilization and disclosure of its contents are prohibited unless expressly permitted. Infringement will incur liability for compensation. All rights pertaining to registration of patent or utility model are reserved.

Checking wind surface

Additional page Wind surface of the load

Before crane operation, you must check the actual wind surface of the load to be lifted and, if necessary, calculate and observe a reduced wind speed.

The permissible wind surface of the load Aper is 1 m2 per t lifting capacity. The actual wind surface of the load AL depends on the wind resistance coefficient cw.

If the actual wind surface is greater than 1 m2 per t lifting capacity or the cw value is greater than 1.2, then maximum permissible wind speed (1) must be reduced. You can find exact specifications on the cw value in relevant standards (e.g. DIN 1055) or corresponding books of tables. If you cannot determine a cw value, then calculate the reduced wind speed vred with a cw value of 2.4.

s

Formula:

vred = v per

1 2 , ⋅ A per -----------------------------

c w

⋅ AL

vred Reduced permissible wind speed in m/sec vper Permissible wind speed in m/sec according to the Lifting capacity table cw Wind resistance coefficient of the load AL Actual wind surface of the load in m2/t Aper Permissible wind surface of the load in m2/t

Example of the calculation of a reduced wind speed:

Assume the lifting capacity per lifting capacity table is 16 t. From this can be calculated a permissible wind surface of Aper = 16 t * 1.0 m2 / t = 16 m2 . In addition, the following apply: –permissible wind speed per lifting capacity table vper = 9 m/s, –actual wind surface of the load AL = 20 m2, e.g. a concrete element with the dimensions 2 m x 10 m, –Wind resistance coefficient of the load cw = 1.3 (for cw values see DIN 1055). These data allow the calculation of a reduced wind speed of:

In this case, crane operation would only be allowed up to a wind speed of 7.7m/s.

vred 9m s ⁄ × 1 2 , 16m

⋅ 2 1 3 , ⋅ 20m

= 2 --------------------------------- = 7 7 , m s ⁄