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 limits expressed therein are based on Table B5. Duerr, 2DM Associates, Inc. Sheaves shall be guarded to prevent inadvertent wire rope jamming or coming out of the sheave. The appropriate limits for various compression elements common to structural members wsme given in Table When reinforcement is not removed: Fabricators that utilize personnel and procedures that bth-12014 qualified under earlier editions of AWS D When conflicts exist between AWS D In order to inhibit unintentional operation of the lifter, one of the following options should be considered: Barton, Doc Magnet G.
The design factor requirement of 1. Interpretations can only be rendered in response to a written request sent to the Secretary of the BTH Standards Committee at go.
Members other than cylindrical members subject to biaxial bending with no axial load shall be proportioned to satisfy eq. Even if a threaded fastener is used as the pin, the connection is still considered a pinned connection and shall be designed as such. Future Committee meeting dates and locations can be found on the Committee Page at http: The allowable stress for members with compact sections provides a lower bound design factor of Nd with respect to the amse moment.
The allowable bearing stress for connections that will rotate under load for a large number of load cycles [eq. Design experience has shown that these allowable bearing stresses also protect the pin against excessive deformation.
Additional design considerations include, but are not limited to, jams and excessive torques. It is not practical to define a general acceptable slip resistance for such connections. If magnetic contactors are included within the aame assembly, they shall be rated in accordance with para. C-2where r is the radius of curvature of the edge of the plate. FTH p threshold value for F sr as given load in Table The strength equations for the plates are empirical, based on research Duerr, Clips shall be tightened evenly to the recommended torque.
Many shapes commonly used in lifting devices have shape factors that are significantly greater than 1. FSR shall be the smaller of the toe crack or root crack allowable stress range.
Table B may assist in determining the required Service Class based on load cycles per day and service life desired.
A qualified person shall evaluate the need for fatigue analysis beyond that provided by section and apply such analyses as needed. Control systems utilizing magnetic contactors shall have sufficient size and quantity for starting, accelerating, reversing, and stopping the lifter. 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 a pinhole is located at a point where significant stresses are induced from member behavior such as tension or bending, the interaction of local and gross member stresses must be considered.
This issue is discussed further in paras.
ASME-BTH – Free Download PDF
Equation bth–1-2014 based on a mean slip coefficient of 0. In the second method, the load is assumed to be shared among the individual plates in proportion to their thicknesses i. The provisions of this section are based on AISC ASME BTH-1— incorporated editorial revisions and two new mechanical design sections for grip ratio and vacuum-lifting device design. Groove welds may be either complete-joint-penetration or partial-joint-penetration type welds.
In reality, actual use of the lifter may differ, possibly significantly, from the defined load spectra.
The Committee selected the upper temperature limit bgh-1-2014 a reasonable maximum temperature of operation in a summer desert environment.
Connections in devices designed for Service Classes 1 through 4 shall be machined as required to avoid the notches that result from flame cutting. The design strength of welds shall be as defined in para. The fatigue life of a lifting device that will be used in a manner such that the standard load spectra are not representative of asem expected loading can be evaluated using eq.
CL hole be other than to require that the strength of the byh-1-2014 pieces within the connection provide a design factor bth–2014 at least 1. A qualified person or manufacturer must assure that the Design Category and Service Class specified for a particular lifter are appropriate for the intended use so as to provide a design with adequate structural reliability and expected service life.
Customary units Fyksi p Load Cycles 0 1 2 3 4 0—20, 20,—, ,—, ,—2, Over 2, For I-shape members and channels bent about the major axis and with unbraced lengths that fall in the ranges defined by either eq.
Multiple bulbs may be provided to avoid confusion due to a burned-out bulb.