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THE EFFECTS OF WIND ON CRANES AND THEIR LOADS

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THE EFFECTS OF WIND ON CRANES AND THEIR LOADS ... (iii): Wind effects must be considered during A/D ops for mobile and tower cranes 1926.1410(c)(1): ... – PowerPoint PPT presentation

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Title: THE EFFECTS OF WIND ON CRANES AND THEIR LOADS


1
THE EFFECTS OF WIND ON CRANES AND THEIR LOADS
Houston Business Roundtable Feb. 12, 2013
  • Matt Gardiner, P.E.

2
PRESENTATION OVERVIEW
Houston Business Roundtable
  1. Wind Effects
  2. Standards Regulations
  3. Wind Related Accidents
  4. Lift Planning Considerations
  5. Questions

3
1
Wind Effects
4
About wind
1
WIND EFFECTS
  • Wind speeds are measured at 33 feet above ground
  • Wind speed increases with height
  • Gusts can be a bigger problem than sustained
    winds
  • Look for obstructions to wind
  • Look for potential areas that funnel or redirect
    wind

5
How does wind affect a lift?
1
WIND EFFECTS
  • Wind applies forces directly to the load (sail
    effect)
  • Wind applies forces directly to the crane
  • Drift can cause tip-overs or side-loading
  • Drift can eliminate clearances with boom or other
    obstructions
  • Drift (inward) can cause backward instability
  • Wind on load can cause load control issues

6
2
Standards Regulations
7
2
OSHA Regulations
STANDARDS REGULATIONS
  • Crane manufacturers, OSHA and ASME provide wind
    requirements
  • 1926 Subpart CC
  • 1926.1403(h)(12) and 1926.1435(b)(4)(iii) Wind
    effects must be considered during A/D ops for
    mobile and tower cranes
  • 1926.1410(c)(1) Power line drift from wind when
    working inside Table A distances
  • 1926.1417(h) Equipment securement requirements
    from storm warnings
  • 1926.1417(n) Capacity adjustment requirements
    due to wind
  • 1926.1431(k)(8)(i) Personnel hoisting
    requirements 20 mph at the platform?
  • 1926.1435(e)(6)(v) and 1926.1437(e)(3) Wind
    indicators required on tower cranes and cranes on
    barges
  • 1926.1437(m)(1)(ii) Load charts must consider
    40 mph winds for cranes on barges
  • 1926.1437(n)(1)(i) Rated capacity reduction
    requirements (as applicable) due to wind for
    cranes on barges

8
2
ASME Standards
STANDARDS REGULATIONS
  • ASME B30.5 - 2011
  • 5-3.1.3.2.1(h)(2) Site Supervisor responsible to
    ensure potential effect of wind is addressed
  • 5-3.2.1.5(b)(5) The effect of wind on the load
    and crane has to be noted and considered
  • 5-3.4.5.4(g) For operations within a FULLY
    ERECTED/EXTENDED BOOM LENGTH of Table 5-3.4.5.1-1
    (same as OSHA Table A), horizontal and vertical
    power line drift due to wind shall be added to
    the minimum clearance distance in the Table
  • Also requires consultation with utility owner to
    get specific clearances

9
4
LIFT PLANNING CONSIDERATIONS
10
What does the manufacturer say?
4
LIFT PLANNING CONSIDERATIONS
  • Most manufacturers recommend capacity reductions
    above 20 mph
  • Most manufacturers set maximum allowable wind
    speeds for operations
  • Always consult the operations manual for
    instructions

11
What is the wind forecast?
4
LIFT PLANNING CONSIDERATIONS
  • Check with reliable sources (NWS, NOAA, official
    stations)
  • Look for peak projected sustained and gust speeds
    AND wind direction(s)
  • Speeds tell you how much force can be applied
  • Direction tells you how the crane and load will
    be loaded by wind
  • Remember that wind forecasts are at a height of
    33 feet and your cranes and loads may be much
    higher

12
Food for thought
4
LIFT PLANNING CONSIDERATIONS
  • Will the wind generate enough force to
    significantly move the load?
  • Will the wind generate enough force on the
    cranes boom to jeopardize stability?
  • Can the wind cause load control problems?
  • Are there nearby buildings that can funnel or
    redirect wind flow?
  • Has the Operations Manual been consulted for
    limitations?
  • Is there anything nearby that can be affected by
    wind that could interfere with the lift?
  • Are there any on-site weather stations or
    anemometers?

13
References
4
LIFT PLANNING CONSIDERATIONS
  • OSHA Regulations
  • ASME Standards
  • Crane Manufacturer (Operations Manual)
  • Cranes and Derricks, by Howard Shapiro

14
5
QUESTIONS?
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