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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No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Wire rope clips attached with U-bolts shall have the U-bolt over the dead end of the wire rope and live rope resting in the clip saddle. Lifting devices often are constructed with discontinuities or geometric stress concentrations such hth-1-2014 pin and bolt holes, notches, bth-1–2014 corners, and shaft keyways that act as initiation sites for fatigue cracks.
Both ferrous and nonferrous materials, including the constructional steels, may same used in the mechanical components described in Chapter 4. The allowable stress for members with compact sections provides a lower bound design factor of Nd with respect to the plastic moment.
Consideration of the effects of stress concentrations is not normally required when determining the static strength of a lifter component see Nonmandatory Appendix C, para. The average tensile stress on the net area through the pinhole shall not exceed the limits defined in para.
Interpretations can only be rendered in response to a written request sent to the Secretary of the BTH Standards Committee at go. The joint details in this table include all of the details shown in AWS D The slip resistance defined in this Standard is based on faying surfaces that are free of loose mill scale, paint, and other coatings. Fasteners shall be installed by an accepted method as determined by the lifting device manufacturer or a qualified person.
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When designing a pin for a connection in which doubler plates are used to reinforce the pinhole region, the assumption of loading to the pin shall be consistent with the assumption of how the load is shared among the main center plate and the doubler plates. Suspended beams exhibit different behavior with respect to lateral torsional buckling Dux and Kitipornchai, This lower temperature limit is also consistent with recommendations made by AISC Jankowski, Walker Magnetics T.
In one method, the strength of each plate is computed and the values summed to arrive at the total strength of the detail. An extended discussion of the basis of the Design Categories and Service Classes can be found in Nonmandatory Appendices B and C commentaries for Chapters 2 and 3, respectively. The design strength of welds shall be as defined in para.
Paragraphs in this Appendix correspond with paragraphs in Chapter 5. Means for discharging the inductive energy of the magnet shall be provided. Description Stress Category Table This Standard does not attempt to address the many variances with btg-1-2014 to evaluating the strength of the connected pieces C 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 design criteria set forth are minimum requirements that may be increased at the discretion of the lifting device manufacturer or a qualified person.
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. The wording of this section permits the use of an additional impact factor at the discretion of a qualified person if it is anticipated that the device will be used under conditions that may result in unusual dynamic loading.
As an example, consider the lifting beam shown in Fig. Regardless of the method used, the required member and connection design factors must be provided.
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.
Please help us to share our service with your friends. The cross-sectional radius of the groove azme form a close-fitting saddle for the size of the wire asmee used, and the sides of the grooves should be tapered outwardly to assist entrance of the wire rope into the groove.
The corrected bending endurance limit, Sec, for the shaft material is Sec p 0. Table B may bt-h1-2014 in determining the required Service Class based on load cycles per day and service life desired. The values stated in U.
Flaws in steel plate material were the primary cause of these failures. Equation and the coefficients given in para. Paragraphs in this Appendix correspond with paragraphs in Chapter 2. Below-the-hook lifters are not stand-alone machines.