ASME BTH-1-2014 PDF
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 inclusion of lateral forces in this paragraph is intended to refer to calculated lateral forces that occur as a result of the intended or expected use of the lifter.
The appropriate limits for various compression elements common to structural members are given in Table Pinned connections that must accommodate large angles of rotation under load or that will rotate under load for a large number of load cycles should be detailed with a small pin-to-hole clearance to minimize wear and play in service. Consideration should be given to conditions such as surface temperatures, contamination, torsion, and bending loads of the vacuum pad, tested vacuum pad performance, and surface conditions of interfacing materials.
Compression elements that are more slender than are permitted for noncompact shapes may fail by local buckling at stress levels below the yield stress.
The values stated in U. Material Thickness of Thicker Part Joined, in. Paragraphs in this Appendix correspond with paragraphs in Chapter 2. Intermittent groove welds are not permitted. Design experience has shown that these allowable bearing stresses also protect the pin against excessive deformation. The joint details in this table include all of the details shown in AWS D The design factor in the elastic range [eq.
Equation applies to cylindrical members. Paragraphs in this Appendix correspond with paragraphs in Chapter 1. Duerr, Vice Chair M. Customary units Fyksi p Thus, static strength may reasonably be computed based on average stresses. Even if a threaded fastener is used as the pin, the connection is still considered a pinned connection and shall be designed as such.
A similar distribution was developed for dynamic loading. Such methods effectively compute average stresses acting on a structural or mechanical element. The effective throat of a fillet weld shall be the shortest distance from the root to the face of the weld. The design of lifting attachments may be addressed by existing industry design standards. The allowable bearing stress, Fp, on the contact area of milled surfaces, fitted bearing stiffeners, and other steel parts in static contact is 1.
The guard needs to be placed close to the running sheave to ensure that the wire rope cannot get jammed or lodged between the sheave and the guard. The minimum throat thickness is determined by the thicker part joined. It is the responsibility of a qualified person to determine when higher design factors are required and to determine the appropriate values in such cases.
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If magnetic contactors are included within the static assembly, they shall be rated in accordance with para. They are intended to be used with cranes, hoists, and other lifting equipment.
Size px x x x x If sufficient lift data are known or can be assumed, the equivalent number of constant amplitude load cycles can be determined using eq. An in-depth discussion of axial—bending interaction and the derivation of these formulas may be found in Galambos Allowable Stress Ranges, ksi MPa.
Other control requirements such as limit switches, master switches, and push buttons are covered in section This Standard does not attempt to address the many variances with respect to evaluating the strength of the connected pieces C This stress distribution exists in the elastic range only.
The design factor requirement of 1. Definitions of the dimensions used in Table The allowable tensile strength through the pinhole, Pt, shall be calculated as follows: As with the Design Category A design factor, this agreement between the design factor calculated on the basis of the load spectra shown in Tables C The component temperature of each part of the lifter must be considered when the device is operating in an environment outside the limits defined in para.
At these temperatures, the mechanical properties of most materials are greatly reduced over those at ambient. The fatigue stress amplification factor, KA, bhh-1-2014 on Same Class shall be selected from Table For cumulative damage analysis of a varying amplitude load spectrum, an equivalent number of constant amplitude load cycles can be calculated using eq.
Fatigue stress on a shaft element shall not exceed the following values: The basic dynamic load rating Cr for a bearing with L 10 bearing life from Table Typical characteristics of the application for this Design Category include rough usage and lifts in adverse, less controlled conditions.
Bolted connections subjected to cyclic shear loading shall be designed as slip-critical connections unless the shear load is transferred between the connected parts by means of dowels, keys, or other close-fit elements.
ASME-BTH – Free Download PDF
The illustrations in Fig. BoxFairfield, NJ www. The value of Vp shall consider the altitude where the lifting device will be used.
These returns shall be in the same plane as the rest of the weld.