Asme Bth Design of Below-The-hook Lifting Devices – Download as PDF ealveDesign Slltellvegrooves· shall be smo~)lh and free from surface ineg:u. Buy ASME BTH 1: DESIGN OF BELOW-THE-HOOK LIFTING DEVICES from SAI Global. ASME BTH Design Of Below-the-hook Lifting Devices Describes minimum structural and mechanical design and electrical component selection criteria.
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Asme Bth-1-2008 Design of Below-The-hook Lifting Devices
Skip to main content. Log In Sign Up. Design of Below-the-Hook Lifting Devices. March 6, The next edition of this Standard is scheduled for publication in There will be no addenda issued to this edition.
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ASME BTH 1 FREE EBOOK
As a consequence, industry has for quite some time bty a need for a comprehensive design standard for below-the hook lifting devices that would complement the safety requirements of ASME B However, members of the construction community expressed the need for design criteria more suitable to their operating conditions, including a lower design factor, and the necessity to address other failure modes such as fracture, shear and buckling, and design topics, such as impact and fasteners.
The two Design Categories provide different design factors for determining allowable static stress limits.
Five Service Classes, based on load cycles, are provided. The Service Class establishes allowable stress range values for lifter structural members and design parameters for mechanical components. Users are encouraged to consult it. Meads, Vice Chair J. Boyd, Ase Boeing Co. Dahlin, Walker Magnetics Group K. Downs, Downs Crane and Hoist Co. Duerr, 2DM Associates, Inc. Edmundson, Morris Material Handling M. Hampton, Space Gateway Support A. Meads, Bradley Lifting Corp. Bradley, Alternate, Bradley Lifting Corp.
Schaltenbrand, Consulting Engineer R. Stemp, Lampson International P. Verenski, Hunter Frew J. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests.
As such, users of this Standard may interact with the Committee by requesting interpretations, proposing revisions, and attending Committee meetings. Corre- spondence should be addressed to: Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard.
Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. 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. Interpretations can only be rendered in response to a written request sent to the Secretary of the BTH Standards Committee.
The request for interpretation should be clear and unambiguous. Cite the applicable paragraph number s and the topic of the inquiry. Bbth the applicable edition of the Standard for which the interpretation is being requested.
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.
The inquirer may also include any plans or drawings, which are necessary to explain the question; however, they should not contain proprietary names or information. Requests that are not in this format may be rewritten in the appropriate format by the Committee prior to being answered, which may inadvertently change the intent of the original request.
ASME procedures provide for reconsideration fre any interpretation when or if additional information that might affect an interpretation is available. This after its date of issuance. Lifting devices manufactured Standard serves as a guide to designers, manufacturers, after the frre date shall conform to the requirements purchasers, and users of below-the-hook lifting devices.
When a lifter is being modified, its design shall be Commentary: This Standard has been zsme in reviewed relative to this Standard, fgee the need to meet response to the need to provide clarification of the this Standard shall be evaluated by the manufacturer or intent of ASME B It is not the intent of this Standard to requested interpretations of the construction structural require retrofitting of existing lifting devices.
Although always implied, this provi- mechanical btb and electrical component selection sion now explicitly states that the design of below-the- criteria for ASME B This requirement has been established in recog- The provisions in this Standard apply to the design nition of the impact that the performance of a lifting or modification of below-the-hook lifting devices.
Com- device has on workplace safety, the complexity of the pliance with requirements and criteria that may be design process, and the level of 11 and training unique to specialized industries and environments is required to competently design lifting devices. Values are given in U.
The values stated in U. Customary units are to be regarded as the standard. The SI units Commentary: As such, this Standard should be used in U.
The design criteria set forth are minimum presented wherever possible in a manner that is dimen- requirements that may be increased at the discretion of sionally independent, thus allowing application of these the lifting device manufacturer or a qualified person.
Customary prohibited, modeling of the device and interpretation of units are the primary units used in this Standard. All below-the-hook lifting devices shall be designed for specified rated loads, load geometry, Design Resolution of loads into forces and stress values affecting The design provisions of this Standard are based on structural members, mechanical components, and con- the use of carbon, high strength low-alloy, or heat treated nections shall be performed by an accepted analysis constructional alloy steel for structural members and method.
[PDF] ASME BTH Design of Below the Hook Devices – Free Download PDF
Other materials byh be used, provided the margins of safety and fatigue life are Commentary: The design provisions in Chapters 3 lifter to its intended service. An extended discussion of and 4 are based on practices and research for design the basis of the Design Categories and Service using carbon, high-strength low-alloy, bt heat-treated Classes can be found in Chapters 2 and 3 Commen- constructional alloy steels. Some of the equations pre- taries.
Both ferrous and nonferrous A proprietary specification shall accurately represent the loads, material properties, is one developed by an individual manufacturer. All welding designs and procedures, except for the Commentary: The design presumption that the actual stresses due to the design strength of welds shall be as defined in para. When loads will asmee computed using classical methods. Consideration of the effects of stress concentrations gree Commentary: This require- strength of a lifter component see Commentary for ment is in agreement with CMAA 70 and those estab- para.
The allowable stresses for tions are most important when determining fatigue life. This is particularly true when evaluating temperature of the component is beyond these limits, static strength.
This paragraph presents a list of defi- The design provisions for electrical components are nitions applicable to the design of below-the-hook lifting considered applicable when ambient temperatures do devices. Lifters expected to operate in used wherever possible. The defined terms are divided ambient dree beyond this limit shall have elec- into general terms para.
The temperature limits stated are Standard. Historically, tension brittle fail- ures have occurred during hydrotest in pressure vessels fabricated from low carbon steel at temperatures as Flaws in steel plate material were ambient temperature: With tighter produc- surrounding the lifting device para.
This attachments, used for attaching loads to a hoist lower temperature limit is also consistent with rree para. Data from asje ASME design: Some materials decline by as much as design factor: At fracture after a sufficient number of ffree cycles these temperatures, the mechanical properties of most para.
Of importance when evaluating the effects of temper- lifting attachment: A lifter may move briefly trunnions, bgh similar appurtenances para. Likewise, a load sapplied: Pressurized fluid systems are not covered by this load, rated: Tension stress is considered to have the that does not vary along its length para. The paragraph given after the definition of a symbol sheave: Some symbols may have different definitions within this sheave, equalizing: Because of its slight movement, it is not termed a running sheave para.
The symbols used in this Standard are sheave, running: Where notation did not exist, means para. A p cross-sectional area, in.