ASME-BTH June 5, | Author: Nanang Komarudin | Category: Strength Of Materials, Engineering, Mechanical Engineering, Science, Nature. Buy ASME BTH 1: DESIGN OF BELOW-THE-HOOK LIFTING DEVICES from SAI Global. ASME BTH Design Of Below-The-Hook Lifting Devices. Be notified when this Standard is updated or amended – Add to StandardsWatch. General.
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The static strength design of a below-the-hook lifting device shall be based on the allowable stresses defined in sections and The shape factors for these shapes are typically 1.
If no desired fatigue life is specified, a qualified person should use the threshold values, FTH, as the allowable stress range, F sr. The qualified person shall consider other factors i. No standards have been found for design factors of pneumatic components.
A lower allowable bearing stress may be required between parts that will move relative to one another under load. C-2where r is the radius of curvature of the edge of the plate.
Tensile stresses in the base metal of all load-bearing structural elements, including shafts and pins, shall not exceed the stress ranges for Stress Category A. This forms the basis for classifying pinned connections as Axme Category E for fatigue design. Since fatiguerelated cracks initiate at points of stress concentration due to either geometric or metallurgical discontinuities, peak stresses created by these discontinuities may need to be considered in the design of a lifter.
In reality, actual use of the lifter may differ, possibly significantly, from the defined load spectra.
Vth-1-2014 allowable stresses specified in these sections do not apply to peak stresses in regions of connections, provided the requirements of section are satisfied. Paragraphs in this Appendix correspond with paragraphs in Chapter 3. Van Every, Tecnomagnete, Inc.
Vacuum Lifting Device Design. This chapter sets forth selection criteria for electrical components of a below-the-hook lifting device. The dimensions used in the formulas for pin-connected plates are illustrated in Fig.
Of importance when evaluating the effects of temperature is the temperature of the lifter component rather than the ambient temperature. 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.
The allowable bending stress for these shapes [eq. Design experience has shown that these allowable bearing stresses also protect the pin against excessive deformation. The allowable bearing stress defined by eq. At these temperatures, the mechanical properties of most materials are greatly reduced over those at ambient.
ASME-BTH – Free Download PDF
A qualified person shall evaluate the need for fatigue analysis beyond that provided by section and apply such analyses as needed. The slip resistance of connections in which the faying surfaces are painted or otherwise coated shall be determined by testing.
Page Location Change 1 Second sentence of last paragraph revised 2, 3 This chapter sets forth design criteria for prismatic structural members and connections of a below-thehook lifting device. A compact section is capable of developing a fully plastic stress distribution before the onset of local buckling in one or more of its compression elements. If the edge of the plate is curved, as illustrated in Fig.
However, the effects of stress concentrations are most important when determining fatigue life. Using these values, eq. The inquirer may also include any plans or drawings that are necessary to explain the question; however, they should not contain proprietary names or information.
Allowable Stress Ranges, ksi MPa.
Such errata shall be used on the date posted. Power supplied to lifting magnets from DC generators can be disconnected by disabling the external power source connected to the generator, or by providing a circuit switch that disconnects excitation power to the generator and removes all power to the lifting magnet. The bearing stress between the pin and the plate in connections that will rotate under load for a large number of load cycles Service Class 1 or higher shall not exceed the value given by eq.
Examples include, but are not limited to, drive systems on slab tongs that hold the load, fasteners that hold hooks onto beams, and sheave shafts.
It shall indicate the presence of the minimum vacuum required for the rated load of bth-1-20144 vacuum lifting device. The limits expressed therein are based on Table B5.
Some manufacturers of heavy equipment such as power generation machinery build lifters to be used for the handling of their equipment. The agreement of the computed BTH design factors with the prior practice was felt to validate the results. The Wire Rope Users Manual, 3rd edition, Table 12 provides information on sizing the wire rope groove with respect to the wire rope to allow for a proper seating surface. Suspended beams exhibit xsme behavior with respect to lateral torsional buckling Dux and Kitipornchai, All motion hazard guards shall a prevent entry of hands, fingers, or other parts of the body into a point of hazard by reaching through, over, under, or around the guard b not create additional motion hazards between the guard and the moving part c utilize fasteners not readily removable by people other than authorized persons d not cause any additional hazards, if openings are provided for lubrication, adjustment, or inspection e reduce bth-1-22014 likelihood of personal injury due to breakage of component parts f be designed to hold the weight of a lb kg person without permanent deformation, if used as a step Wire rope shall be of a recommended construction for lifting service.
However, in no case shall the effective throat thickness be less than the size required to transmit the calculated forces. The effective width shall be taken as the smaller of the values calculated as follows: The design criteria set forth are minimum requirements that may be increased at the discretion of the lifting device manufacturer or a qualified person.