25 Jan AN AMERICAN NATIONAL STANDARD. ASME BTH-1– (Revision of ASME BTH-1–). Design of. Below-the-Hook. Lifting Devices. Buy ASME BTH 1: DESIGN OF BELOW-THE-HOOK LIFTING DEVICES from SAI Global. ASME BTH Design of Below the Hook Lifting Devices Reduced – Download as PDF File .pdf), Text File .txt) or read online.

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The value of Cr may be taken as 1. All technical inquiries must be submitted in writing to the staff secretary. The intent is to provide the owner with the opportunity for more economical designs for the cases where duty service is less severe. Typical characteristics of the application for this Design Category include lifts at slow speeds aame a well-maintained lifting device under the control of a lift supervisor and experienced crane operator.

Other motors used to operate a lifting device may be 30 min or 60 min intermittent duty, provided they can meet the required duty cycle of the lifter without overheating.

Fasteners shall be installed by an accepted method as determined by the lifting device manufacturer or a qualified person. If a pinhole is hth 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.

The qualified person shall consider other factors i. Means for discharging the inductive energy of the magnet shall be provided. A qualified person needs to consider the same operating and abnormal scenarios used in the design of the structural components, including environment, same and asmw cycles, when incorporating commercial components into the lifting device.

This Standard provides minimum structural and mechanical design and electrical component selection criteria for ASME B The width of the slot shall meet the same criteria as the diameter of the hole for a plug weld.

The values for use in eq. BoxFairfield, NJ www.

Paragraphs in this Appendix correspond with paragraphs in Awme 1. Unintended loss of power shall not disconnect the pad s from the vacuum preservation method. Equation is applicable only to sections with a compression flange that is solid, approximately rectangular in shape, and that has an area not less than the tension flange. The vertical load in the pinhole produces shear stresses above the hole.


Groove welds loaded perpendicular to the axis of the weld shall be designed for tension or compression forces. Barton, Doc Magnet G. The slip resistance defined in this Standard is based on faying surfaces that are free of loose mill scale, paint, and other coatings.


Such proposals should be as specific as possible, citing the paragraph number sthe proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. The system shall be designed to protect against pressures exceeding the rating of the system or any component. Are you an Engineering professional?

Welded connection design shall provide adequate access for depositing the weld metal. Due to the very broad range of lifting devices that may fall under the scope of this Standard, defining actual deflection limits for different types of devices is not same.

ASME BTH – Structural engineering other technical topics – Eng-Tips

Note that the term in brackets in eq. Means for lubricating sheave bearings shall be provided. This Design Category should not be used in any environment where severe conditions or use are present. The joint details in this table include all of the details shown in AWS D The paragraph given after the definition of a term refers to the paragraph where the term is first used.

To prevent premature wearing of the wire rope, the sheave surfaces need to be smooth and tapered to allow the wire rope to easily slip into and seat in the sheave rope groove.

The maximum fillet weld size is based on the thickness of the connected parts. The design of lifting attachments may be addressed by existing industry design standards.

The minimum partial-penetration groove weld effective throat thickness is given in Table C-1 to be established is the reliability index. The resulting table was cross referenced to CMAA 70 to verify that it does not significantly deviate. The provisions axme in this Standard address the most common and broadly applicable axme of the design of below-the-hook lifting devices. Dahlin, Walker Magnetics J.


Initiating at weld root subject to tension extending into and through weld. Errata to codes and standards may be posted on the ASME Web site adme the Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards.

N is the expected number of constant amplitude stress range cycles and is to be provided by the owner. Allowable stresses or allowable loads in bolts are established as the ultimate tensile strength, the ultimate shear strength, or slip resistance divided by the appropriate design factor. Likewise, a lifter that handles very hot items may have some components axme become btu due to contact.

The effective weld area for either type is defined as the effective length of weld multiplied by the effective throat thickness.

This issue is discussed further in paras. Along with these technical bht, the nonmandatory Commentary for each chapter was moved to its own respective Nonmandatory Appendix.

Customary units are to be regarded as the standard. These design considerations must be evaluated and accounted for by the lifting device manufacturer or qualified person.

If sufficient lift data are known asem can be assumed, the equivalent number of constant amplitude load cycles can be determined using eq. As a consequence, industry has for quite some time expressed a need for a comprehensive design standard for below-the-hook lifting devices that would complement the safety requirements of ASME B However, the effects of stress concentrations are most important when determining fatigue life.

Asmee, pneumatic fluid power components may be selected in accordance with para.