The design provisions of this Standard are considered applicable when the temperature of the lifter structural or mechanical component under consideration is within the range of 25☏ to l5OF (-4☌ to 66☌). Welding of lifters fabricated from metals other than steel shall be performed in accordance with a suitable welding specification as determined by a qualified person, provided the quality and inspection requirements are equal to or greater than those required by this Standard. When conflicts exist between AWS D14.1/D14.1M and this Standard, the requirements of this Standard shall govern. Other materials may be used, provided the margins of safety and fatigue life are equal to or greater than those required by this Standard.Īll ferrous and nonferrous metal used in the fabrication of lifting device structural members and mechanical components shall be identified by an industry-wide or written proprietary specification.Īll welding designs and procedures for lifters fabricated from steel, except for the design strength of welds, shall be in accordance with the requirements of AWS D141/D14.1M The design strength of welds shall be as defined in para. The design provisions of this Standard are based on the use of carbon, high-strength low-alloy, or heat- treated constructional alloy steel for structural members and many mechanical comIxnents. The analysis techniques and models used by the qualified person shall accurately represent the loads, material properties, and device geometry stress values resulting from the analysis shall be of suitable form to permit correlation with the allowable stresses defined in this Standard. The allowable stresses and stress ranges defined in this Standard are based on the assumption of analysis by classical strength of material methods (models), although other analysis methods may be used. Resolution of loads into forces and stress values affecting structural members, mechanical components, and connections shall be performed by an accepted analysis method. Customary units.Īll below-the-hook lifting devices shall be designed for specified rated loads, load geometry, Design Category (see section 2-2), and Service Class (see section 2-3).
The SI units in the text have been directly (softly) converted from U.S. Customary units are to be regarded as the standard. Customary units as the primary units followed by the International System of Units (SI) in parentheses as the secondary units.
Lifting devices shall be designed by, or under the direct supervision of, a qualified person.Ī dual unit format is used.
ASME BTH-1-2017 pdf free download.Design of Below-the-Hook Lifting Devices.
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