ASME B30.5-2007 pdf free download.Mobile and Locomotive Cranes Safety Standard for Cableways, Cranes, Derricks, Hoists, Hooks, Jacks, and Slings
5-1.1.2 Load Ratings — Where Structural Competence Governs Lifting Performance
(a) Load ratings for some radii are limited by the stability of the crane. However, in some of the operating ranges the rating may be limited by factors other than stability, such as the conditions described below.
(1) The loads that will produce a condition of tip- ping increase rapidly and reach extreme values as the minimum operating radius and tipping fulcrum of the machine are approached. At some radii, these loads are of such magnitude that they cannot be fully taken into account in the crane structure design without excessive weight, which would severely limit performance and ratings at the longer radii where most work is done. Hence, load ratings at some radii may be based on structural competence of the machine rather than stability.
(2) A nonsymmetrical mounting requires a higher loading to produce a condition of tipping in a direction otherthanthatofleaststabilityonwhichtheloadratings are established. Therefore, if the crane specification includes additional ratings for directions other than the least stable, such ratings may also be governed by struc- turalcompetence ratherthanstability.Forsuchspecified additional ratings, the work area shall be indicated; for those ratings that might be governed by tipping loads, the applicable percentage factors in para.
5-1.1.(a) shall not be exceeded. (b) For all operational applications, the crane load ratings established by the manufacturer shall not be exceeded (refer to para. 5-3.2.1).
5-1.1.3 Load Rating Chart(a) A durable rating chart(s) with legible letters and figures shall be provided with each crane and attached in a location accessible to the operator while at the controls. The data and information to be provided on these charts shall include, but not be limited to, the following:
(1) A full and complete range of manufacturer’s crane load ratings at all stated operating radii, boom angles, work areas, boom lengths and configurations, jib lengths and angles (or offset), as well as alternate ratings for use and nonuse of optional equipment on the crane, such as outriggers and extra counterweights, which affect ratings.
(2) A work areachartfor which capacities arelisted in the load rating chart (see Fig. 11). 1
(3) Whereratings arelimitedby structural,hydrau- lic, or factors other than stability, the limitations shall be shown and emphasized on the rating charts.
(4) In areas where no load is to be handled, the work area figure and load rating chart shall so state.
(5) Recommended reeving for the hoist lines shall be shown.ASME B30.5 pdf download.ASME B30.5-2007 pdf free download
