Other sources of local high wind speed to consider are aircraft slipstreams at airports and high-sided vehicles on motorways. You should be aware of the shielding and funnelling effects of high buildings which may cause high wind speeds on days when the wind speed in open areas is low. Wind speed is measured with an anemometer, a device that gets its name from anemos, a Greek word that means the wind. For the same reason, signboards and the like must not be applied even temporarily to the platform. It is very important to realise that wind speed increases with height and may be 50% greater at a height of 20 metres above ground level.Ĭare must be taken when handling building cladding, sheet materials, panels and other such materials which can act as "sails" and seriously affect the stability of a MEWP, especially in gusty wind conditions. Wind speed can be measured using an anemometer. This does not apply to MEWPs intended for indoor use only. An anemometer is an instrument used to measure the speed of the wind, which is a common weather station instrument, or to calculate any form of current gas. Wind forces are assumed to act horizontally at the centre of area of the parts of the MEWP and persons and equipment on the work platform, and shall be taken to be dynamic forces. Under BS EN280:2001+A2:2009 (Mobile elevating work platforms – Design calculations – Stability criteria – Construction – Safety – Examinations and tests) the maximum design wind speed in which a MEWP can work is 12.5 m/s (28 mph). Operation in wind speeds above this maximum may cause instability. The earliest known description of an anemometer was by Italian architect and author Leon Battista Alberti (14041472) in 1450. It is a common instrument used in weather stations. Share this Share on Facebook Share on LinkedIn Share on TwitterĪll MEWPs (except those designed specifically for indoor use) are designed to operate in wind speeds up to a maximum which should be marked on the machine. In meteorology, an anemometer (from Greek (anemos) 'wind', and (metron) 'measure') is a device that measures wind speed and direction.
0 Comments
Leave a Reply. |