ASME BTH 1 2020

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ASME BTH-1 – 2020 Design of Below-the-Hook Lifting Devices

Published By	Publication Date	Number of Pages
ASME	2020	85

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Description

BTH-1 provides minimum structural and mechanical design and electrical component selection criteria for ASME B30.20 below-the-hook lifting devices. The provisions in this Standard apply to the design or modification of below-the-hook lifting devices. Compliance with requirements and criteria that may be unique to specialized industries and environments is outside of the scope of this Standard. Lifting devices designed to this Standard shall comply with ASME B30.20, Below-the-Hook Lifting Devices. B30.20 includes provisions that apply to the marking, construction, installation, inspection, testing, maintenance, and operation of below-the-hook lifting devices. BTH-1 addresses only design requirements. As such, this Standard should be used in conjunction with B30.20, which addresses safety requirements. BTH-1 does not replace B30.20. The design criteria set forth are minimum requirements that may be increased at the discretion of the lifting device manufacturer or a qualified person. Key changes to this revision of BTH-1 include: • Addition of chapter of requirements for Lifting Magnet Design with additional commentary found in a corresponding new Nonmandatory Appendix • Addition of design requirements for new Design Category for specialized application in industries that require lifting designs based on a specified larger Design factor • Addition of new requirements for Member Properties • Updated Table 3-2.2-1 Limiting Width-Thickness Ratios for Compression Elements BTH-1 and B30.20 are to be used in conjunction with equipment described in other volumes of the ASME B30 series of Safety Standards. Careful application of these Safety Standards will help users to comply with applicable regulations within their jurisdictions, while achieving the operational and safety benefits to be gained from the many industry best-practices detailed in these volumes. Intended for manufacturers, owners, employers, users and others concerned with the specification, buying, maintenance, training and safe use of below-the-hook lifting devices with B30 equipment, plus all potential governing entities.

PDF Catalog

PDF Pages	PDF Title
4	CONTENTS
6	FOREWORD
7	ASME BTH STANDARDS COMMITTEE ROSTER
8	CORRESPONDENCE WITH THE BTH COMMITTEE
10	ASME BTH-1–2020 SUMMARY OF CHANGES
12	Chapter 1 Scope, Definitions, and References 1-1 PURPOSE 1-2 SCOPE 1-3 NEW AND EXISTING DEVICES 1-4 GENERAL REQUIREMENTS 1-4.1 Design Responsibility 1-4.2 Units of Measure 1-4.3 Design Criteria 1-4.4 Analysis Methods 1-4.5 Material
13	1-4.6 Welding 1-4.7 Temperature 1-5 DEFINITIONS 1-5.1 Definitions — General
14	1-5.2 Definitions for Chapter 3 1-5.3 Definitions for Chapter 4 1-5.4 Definitions for Chapter 5
15	1-5.5 Definitions for Chapter 6
16	1-6 SYMBOLS 1-6.1 Symbols for Chapter 3 Figures Figure 1-5.5-1 Magnetic Lifters
18	1-6.2 Symbols for Chapter 4
19	1-6.3 Symbols for Chapter 6 1-7 REFERENCES
21	Chapter 2 Lifter Classifications 2-1 GENERAL 2-1.1 Selection 2-1.2 Responsibility 2-1.3 Identification 2-1.4 Environment 2-2 DESIGN CATEGORY 2-2.1 Design Category A 2-2.2 Design Category B 2-2.3 Design Category C 2-3 SERVICE CLASS Tables Table 2-3-1 Service Class
22	Chapter 3 Structural Design 3-1 GENERAL 3-1.1 Purpose 3-1.2 Loads 3-1.3 Static Design Basis 3-1.4 Fatigue Design Basis 3-1.5 Curved Members 3-1.6 Allowable Stresses 3-1.7 Member Properties
23	3-2 MEMBER DESIGN 3-2.1 Tension Members 3-2.2 Compression Members 3-2.3 Flexural Members
24	Table 3-2.2-1 Limiting Width-Thickness Ratios for Compression Elements
26	3-2.4 Combined Axial and Bending Stresses
27	3-2.5 Combined Normal and Shear Stresses 3-2.6 Local Buckling 3-3 CONNECTION DESIGN 3-3.1 General
28	3-3.2 Bolted Connections 3-3.3 Pinned Connections
29	3-3.4 Welded Connections
30	Table 3-3.4.2-1 Minimum Effective Throat Thickness of Partial-Penetration Groove Welds
31	3-4 FATIGUE DESIGN 3-4.1 General 3-4.2 Lifter Classifications 3-4.3 Allowable Stress Ranges 3-4.4 Stress Categories 3-4.5 Tensile Fatigue in Threaded Fasteners Table 3-3.4.3-1 Minimum Sizes of Fillet Welds
32	3-4.6 Cumulative Fatigue Analysis 3-5 OTHER DESIGN CONSIDERATIONS 3-5.1 Impact Factors Table 3-4.3-1 Allowable Stress Ranges, ksi (MPa)
33	3-5.2 Stress Concentrations 3-5.3 Deflection
34	Table 3-4.4-1 Fatigue Design Parameters
48	Chapter 4 Mechanical Design 4-1 GENERAL 4-1.1 Purpose 4-1.2 Relation to Chapter 3 4-2 SHEAVES 4-2.1 Sheave Material 4-2.2 Running Sheaves 4-2.3 Equalizing Sheaves 4-2.4 Shaft Requirement 4-2.5 Lubrication 4-2.6 Sheave Design 4-2.7 Sheave Guard 4-3 ROPE 4-3.1 Relation to Other Standards Figure 4-2.6-1 Sheave Dimensions
49	4-3.2 Rope Selection 4-3.3 Environment 4-3.4 Fleet Angle 4-3.5 Rope Ends 4-3.6 Rope Clips 4-4 DRIVE SYSTEMS 4-4.1 Drive Adjustment 4-4.2 Drive Design 4-4.3 Commercial Components 4-4.4 Lubrication 4-4.5 Operator Protection 4-5 GEARING 4-5.1 Gear Design 4-5.2 Gear Material 4-5.3 Gear Loading Figure 4-2.7-1 Sheave Gap
50	4-5.4 Relation to Other Standards 4-5.5 Bevel and Worm Gears 4-5.6 Split Gears 4-5.7 Lubrication 4-5.8 Operator Protection 4-5.9 Reducers 4-6 BEARINGS 4-6.1 Bearing Design 4-6.2 L10 Bearing Life 4-6.3 Bearing Loadings Table 4-5.3-1 Strength Factors for Calculating Load Capacity (American Standard Tooth Forms)
51	4-6.4 Sleeve and Journal Bearings 4-6.5 Lubrication 4-7 SHAFTING 4-7.1 Shaft Design 4-7.2 Shaft Alignment 4-7.3 Operator Protection 4-7.4 Shaft Details 4-7.5 Shaft Static Stress Table 4-6.2-1 L10 Bearing Life
52	4-7.6 Shaft Fatigue Table 4-7.5-1 Key Size Versus Shaft Diameter (ASME B17.1) Table 4-7.5-2 Key Size Versus Shaft Diameter (DIN 6885-1) Table 4-7.6.1-1 Fatigue Stress Amplification Factors
53	4-7.7 Shaft Displacement 4-8 FASTENERS 4-8.1 Fastener Markings 4-8.2 Fastener Selection 4-8.3 Fastener Stresses 4-8.4 Fastener Integrity 4-8.5 Fastener Installation 4-8.6 Noncritical Fasteners 4-9 GRIP SUPPORT FORCE 4-9.1 Purpose 4-9.2 Pressure-Gripping and Indentation Lifter Support Force 4-10 VACUUM LIFTING DEVICE DESIGN 4-10.1 Vacuum Pad Capacity
54	4-10.2 Vacuum Preservation 4-10.3 Vacuum Indicator 4-10.4 Unintended Operation 4-11 FLUID POWER SYSTEMS 4-11.1 Purpose 4-11.2 Fluid Power Components Figure 4-9.2-1 Illustration of Holding and Support Forces
55	4-11.3 Power Source/Supply 4-11.4 Fluid Pressure Indication 4-11.5 Fluid Pressure Control 4-11.6 System Guarding
56	Chapter 5 Electrical Design 5-1 GENERAL 5-1.1 Purpose 5-1.2 Relation to Other Standards 5-1.3 Power Requirements 5-2 ELECTRIC MOTORS AND BRAKES 5-2.1 Motors 5-2.2 Motor Sizing 5-2.3 Temperature Rise 5-2.4 Insulation 5-2.5 Brakes 5-2.6 Voltage Rating 5-3 OPERATOR INTERFACE 5-3.1 Locating the Operator Interface 5-3.2 Unintended Operation
57	5-3.3 Operating Levers 5-3.4 Control Circuits 5-3.5 Push Button Type 5-3.6 Push Button Markings 5-3.7 Sensor Protection 5-3.8 Indicators 5-4 CONTROLLERS AND AUXILIARY EQUIPMENT 5-4.1 Control Considerations 5-4.2 Control Location 5-4.3 Control Selection 5-4.4 Magnetic Control Contactors 5-4.5 Static and Inverter Controls 5-4.6 Lifting Magnet Controllers 5-4.7 Rectifiers
58	5-4.8 Electrical Enclosures 5-4.9 Branch Circuit Overcurrent Protection 5-4.10 System Guarding 5-5 GROUNDING 5-5.1 General 5-5.2 Grounding Method 5-6 POWER DISCONNECTS 5-6.1 Disconnect for Powered Lifter 5-6.2 Disconnect for Vacuum Lifter 5-6.3 Disconnect for Magnet 5-7 BATTERIES 5-7.1 Battery Condition Indicator 5-7.2 Enclosures 5-7.3 Battery Alarm
59	Chapter 6 Lifting Magnet Design 6-1 PURPOSE 6-2 DESIGN REQUIREMENTS 6-2.1 General 6-2.2 Application and Environmental Profile 6-3 SELECTION AND DESIGN 6-3.1 Components 6-3.2 Magnetic Circuit 6-3.3 Effective Magnet Contact Area
60	6-3.4 Flux Source
61	6-3.5 Flux Path 6-3.6 Release Mechanism 6-3.7 Encapsulation Compound 6-3.8 Multiple Magnet Systems 6-3.9 Environmental Considerations
63	NONMANDATORY APPENDICES NONMANDATORY APPENDIX A COMMENTARY FOR CHAPTER 1: SCOPE, DEFINITIONS, AND REFERENCES A-1 PURPOSE A-2 SCOPE A-3 NEW AND EXISTING DEVICES A-4 GENERAL REQUIREMENTS
64	A-5 DEFINITIONS
65	A-6 SYMBOLS A-7 REFERENCES
67	NONMANDATORY APPENDIX B COMMENTARY FOR CHAPTER 2: LIFTER CLASSIFICATIONS B-1 GENERAL B-2 DESIGN CATEGORY
68	Table B-3-1 Service Class Life B-3 SERVICE CLASS
69	NONMANDATORY APPENDIX C COMMENTARY FOR CHAPTER 3: STRUCTURAL DESIGN C-1 GENERAL
70	Table C-1.3-1 Design Category A Static Load Spectrum Table C-1.3-2 Design CategoryADynamic Load Spectrum Table C-1.3-3 Design Category B Static Load Spectrum
71	Table C-1.3-4 Design CategoryBDynamic Load Spectrum C-2 MEMBER DESIGN
73	Figure C-2.6-1 Selected Examples of Table 3-2.2-1 Requirements C-3 CONNECTION DESIGN
74	Figure C-3.2-1 Block Shear
75	Figure C-3.3.1-1 Pin-Connected Plate Notation Figure C-3.3.2-1 Stiffened Plate Lifting Beam
76	C-4 FATIGUE DESIGN
77	C-5 OTHER DESIGN CONSIDERATIONS
78	NONMANDATORY APPENDIX D COMMENTARY FOR CHAPTER 4: MECHANICAL DESIGN D-1 GENERAL D-2 SHEAVES
79	D-3 ROPE D-4 DRIVE SYSTEMS D-5 GEARING
80	D-6 BEARINGS D-7 SHAFTING D-8 FASTENERS D-9 GRIP SUPPORT FORCE D-10 VACUUM LIFTING DEVICE DESIGN D-11 FLUID POWER SYSTEMS
81	NONMANDATORY APPENDIX E COMMENTARY FOR CHAPTER 5: ELECTRICAL DESIGN E-1 GENERAL E-2 ELECTRIC MOTORS AND BRAKES E-3 OPERATOR INTERFACE
82	E-4 CONTROLLERS AND AUXILIARY EQUIPMENT E-5 GROUNDING
83	NONMANDATORY APPENDIX F COMMENTARY FOR CHAPTER 6: LIFTING MAGNET DESIGN F-3 SELECTION AND DESIGN