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ASME BTH-1-2023

Design of Below-the-Hook Lifting Devices
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ASME BTH-1-2023

Design of Below-the-Hook Lifting Devices

PUBLISH DATE 2023
ASME BTH-1-2023
The purpose of ASME BTH-1-2023 is to set forth the minimum structural, mechanical design, and electrical component selection criteria for below-the-hook lifting devices.
What is ASME BTH-1-2023 Used For? ASME BTH-1-2023, titled "Design of Below-the-Hook Lifting Devices," is used as a comprehensive guide for:
  • Designers and Manufacturers: It provides the technical framework for engineering new below-the-hook lifting devices or modifying existing ones, ensuring they are built with the required safety factors, material strength, and load-bearing capacities.
  • Purchasers and Users: It helps in specifying, buying, and verifying that lifting devices comply with globally recognized safety and performance best practices.
  • Compliance with ASME B30.20: It complements the ASME B30.20 standard (Below-the-Hook Lifting Devices), which covers the safety requirements for the marking, construction, installation, inspection, testing, maintenance, and operation of these devices. ASME BTH-1 focuses specifically on the design aspects.

Key Design Criteria Covered The standard defines critical parameters that must be considered during the design process, including:
  • Design Categories (A or B): These are based on the predictability of the magnitude and variation of loads, and the severity of the loading and environmental conditions.
  • Service Classes: These are based on the expected number of load cycles (fatigue life) for which the device is designed.
  • Allowable Stresses: It provides formulas and methods for calculating allowable stresses in materials, welding designs, and connections (like bolts and pins).
  • Load Geometry and Rated Load Capacity: It clarifies the requirements for establishing a device's maximum safe working load.

Examples of Below-the-Hook Lifting Devices "Below-the-hook lifting devices" are equipment used to connect a load to a hoist, crane, or other lifting equipment. They include, but aren't limited to:
  • Structural and mechanical lifting devices (e.g., spreader beams, lifting beams).
  • Vacuum lifting devices.
  • Lifting magnets (operated close proximity or remotely operated).
  • Scrap and material handling grapples.
SDO ASME: American Society of Mechanical Engineers
Document Number BTH-1
Publication Date Oct. 16, 2023
Language en - English
Page Count
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