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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Brookbank, Alternate, Hunter Lift Ltd. However, fatigue design must recognize stress ranges. Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation.
Cb may be conservatively taken as unity.
FTH p threshold value for F sr as given load in Table The use of other materials may require a different bth-12-014 of evaluating the fatigue life of the lifter. Members and connections subjected to fewer than 20, load cycles Service Class 0 need not be analyzed for fatigue.
ASME-BTH – Free Download PDF
Although guards and personnel protective equipment are safety equipment, they were incorporated into this design standard. This Standard does not attempt to address the many variances with respect to evaluating the strength of the connected pieces C The strength of a weld is governed by bth–1-2014 the base material or the deposited weld material as follows: Allowable stresses for design conditions not addressed herein shall be based on the following design factors: Cite the applicable edition of the Standard for which the interpretation is being requested.
The distribution of lifted loads relative to rated load is considered to be as shown in Table C Size px x x x x This is particularly true when evaluating static strength. The minimum center-to-center spacing in a longitudinal direction on any line shall be two times the length of the slot. This can be particularly useful in evaluating an existing lifting device azme its remaining life.
ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available. The width of the slot shall meet the same criteria as the diameter of the hole for a plug weld. The effective width shall be taken as the smaller of the values calculated as follows: A similar distribution was developed for dynamic loading.
The configuration of bolted connections in lifting devices will likely vary greatly from the standard types of connections used in steel construction.
The effects of dust, moisture, and corrosive atmospheric substances on the integrity and performance of a lifter cannot be specifically defined. Bearing enclosures should be designed to exclude dirt and prevent leakage of oil or grease.
Particular care needs to be taken when evaluating the lubrication method since some types of self-lubricating bearings cannot withstand severe loading environments.
Shear forces and bending moments in the pin shall be computed based on the geometry of the connection.
The intent is to provide the owner with the opportunity for more economical designs for the cases where duty service is less severe. Power supplied to lifting magnets from DC generators can be disconnected by disabling the external asms 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. Control panels shall be enclosed and shall be suitable for the environment and type of controls.
If manual application is used, the qualified person needs to provide accessibility to the gears for maintenance. A qualified person shall evaluate the need for fatigue analysis beyond that provided by section and apply such analyses as needed.
It is not intended that highly localized peak stresses that may be determined by computeraided methods of analysis and that may be blunted by confined yielding must be less ssme the specified allowable stresses. An bth-1-20014 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. Participation by federal agency representative s or asm s affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.
Stress range is the algebraic difference between the maximum stress and the minimum stress. Of importance when evaluating the effects of temperature is the temperature of the lifter component rather than the ambient temperature.
When the plates are relatively thick, however, this method can yield excessively conservative results.