This Standard serves as a guide to designers, manufacturers, purchasers, and users of below-the-hook lifting devices. Values are given in U. Customary units as the primary units followed by the International System of Units SI in parentheses as the secondary units. The values stated in U. Customary units are to be regarded as the standard. The SI units in the text have been directly softly converted from U.
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This Standard serves as a guide to designers, manufacturers, purchasers, and users of below-the-hook lifting devices.
Values are given in U. Customary units as the primary units followed by the International System of Units SI in parentheses as the secondary units.
The values stated in U. Customary units are to be regarded as the standard. The SI units in the text have been directly softly converted from U. Customary units. This Standard provides minimum structural and mechanical design and electrical component selection criteria for ASME B The provisions in this Standard apply to the design or modification of below-the-hook lifting devices.
Compliance with requirements and criteria that may be unique to specialized industries and environments is outside the scope of this Standard. ASME B The provisions defined in this Standard address the most common and broadly applicable aspects of the design of below-the-hook lifting devices.
Resolution of loads into forces and stress values affecting structural members, mechanical components, and connections shall be performed by an accepted analysis method. 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. Lifting devices manufactured after the effective date shall conform to the requirements of this Standard.
When a lifter is being modified, its design shall be reviewed relative to this Standard, and the need to meet this Standard shall be evaluated by the manufacturer or a qualified person. Other materials may be used, provided the margins of safety and fatigue life are equal to or greater than those required by this Standard.
The design strength of welds shall be as defined in para. When conflicts exist between AWS D 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 the temperature of the component is beyond these limits, special additional design considerations may be required.
These considerations may include choosing a material that has better cold-temperature or hightemperature properties, limiting the design stresses to a lower percentage of the allowable stresses, or restricting use of the lifter until the component temperature falls within the stated limits.
Lifters expected to operate in ambient temperatures beyond this limit shall have electrical components designed for the higher ambient temperature. The paragraph given after the definition of a term refers to the paragraph where the term is first used.
The device may contain components such as slings, hooks, and rigging hardware that are addressed by ASME B30 volumes or other standards section Tension stress is considered to have the opposite algebraic sign from compression stress para. The term applies to both hydraulics, which uses a pressurized liquid such as oil or water, and pneumatics, which uses compressed air or other gases section L10 bearing life: the basic rating or specification life of a bearing para.
Because of its slight movement, it is not termed a running sheave para. Each symbol is defined where it is first used. For rolled shapes, this value may be taken as the clear distance between flanges less the fillet or corner radius, in. N-mm para. Box , Fairfield, NJ www.
The selection of Design Category and Service Class shall be the responsibility of a qualified person representing the owner, purchaser, or user of the lifting device. If not specified by the owner, purchaser, or user, the Design Category and Service Class shall be designated by the qualified person responsible for the design. Load Cycles 0 1 2 3 4 0—20, 20,—, ,—, ,—2,, Over 2,, Lifter components operating at temperatures outside the range specified in para. The selected Service Class establishes allowable stress range values for structural members section and design parameters for mechanical components sections and The design factors are given in para.
This Lifting devices shall be designed by, or under the Standard serves as a guide to designers, manufacturers, direct supervision of, a qualified person. Values are given in U. Customary units as the primary units followed by the This Standard provides minimum structural and International System of Units SI in parentheses as the mechanical design and electrical component selection secondary units. The values stated in U. The SI units Devices. Customary units.
Design of Below-the-Hook Lifting Devices
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