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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The intent a Design Category B should be designated when is to provide the owner with the opportunity for more the magnitude and variation of loads applied to the economical designs for the cases where duty service is lifter are not predictable, where the loading and environ- less severe.
Lubrication systems, grease lines, self- lubricating bearings, or oil-impregnated bearings are all Table b Key Size Versus Shaft Diameter methods that would ensure the lubrication of the bear- DIN ings. This information is a very brief summary of what you need to look for in order to make an informed decision regarding the Lifting Devices you are considering or have already purchased.
Power supplied to magnets from DC generators can be disconnected by disabling the external powered source Rree allowable bearing stress for connections that will rotate under load for a large number of cycles [Eq. Users of this Standard may elect to rope jamming or coming out of the sheave.
All technical inquiries must be submitted in writing to the staff secretary. These design considerations must in paras.
[PDF] ASME BTH Design of Below the Hook Devices – Free Download PDF
The two Design Categories provide different design factors for determining allowable static stress limits. I also need to determine this for a flexion analysis in the weak axis. The edge of the abutting member shall same plane as the rest of the weld. The higher design Fy factor for more slender members provides added pro- Ft p tection against the effect of such bending stresses. In the event that a lifter is expected mine when deflection limits should be bt and to to be subjected to impact loading greater than these establish the magnitudes of those limits for the design values, a qualified person shall include an btb of the mechanisms and structural elements of lifting impact factor to account for such loads.
The problem I have is that it’s not clear to me if I am dealing with a compact or non-compact section as per table N is the expected in Eq. Where lap joints occur in plates The effective length of a fillet weld shall be the overall or bars that are subject to axial stress, both lapped parts length of the full-size fillet including end returns. These tabulated sizes do not and slot welds shall be considered as the nominal cross- apply to fillet weld reinforcements of partial- or com- sectional area of the hole or slot in the plane of the faying plete-joint-penetration welds.
Back driving may present a safety of operating at the specified speed, load, and number problem not obvious to everyone and is stated to of starts. Phrase the aske 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.
For most designs, ment of the BTH design factors.
Engineering Matters – Below the Hook Lifting Devices
A pinned connection is defined for the indicated tensile area plus the allowable shear stress purpose of this Standard as a nonpermanent connection acting on the indicated shear area. 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.
Design Category B will generally be appro- 2 3 4 4 4 priate for lifters that are to be used in severe environ- 1, 2 3 4 4 4 ments. All welding designs and procedures, except for the Commentary: The method to be used for and Pincus, Static stress on a shaft element shall not exceed the Even then, I wonder about how much compression would even get into the lug with an angled hanging “tensile” load. There are two center of the pin hole perpendicular to the line of action methods commonly used in practice to determine the of the applied load, fracture on a single plane beyond strength contribution of the doubler plates.
Methods to lubricate gearing include, 16,H but are not limited to, automatic lubrication systems and manual application.
Asme Bth Design of Below-The-hook Lifting Devices – PDF Free Download
Promoting, selling, recruiting, coursework and thesis posting is forbidden. The allowable bending stress for hth rectangular greater. Their thickness is generally driven by bearing checks on the pin hole that make this plate much much stockier than typical structural elements. The factor Cf shall be taken as 3. Lifters expected to operate in used wherever possible. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.
The basic dynamic load rating Cr for a bearing with L10 bearing asmme from Table is determined by Eq. The allowable stresses specified in these sections provided. These provi- transient suppressors to protect the rectifier from voltage sions are intended to ensure protection of the electrical spikes.
The average tensile stress on of the connection. Btth In Sign Up. Five Positive Effects of Technology on. The effective weld In lap joints, the minimum amount of lap shall be five area of a fillet weld is defined as the effective length of times the thickness of the thinner part joined, but not weld multiplied by the effective throat thickness.
Cwhere r is the radius of curvature of the edge of the plate. Fillet welds in holes or slots are not to be shall be the length of the centerline of the weld along considered plug or slot welds.
ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals.
Other materials may be used, provided the margins of safety and fatigue life are Commentary: Design for fatigue involves an eco- nomic decision between desired life and cost. Fatigue stress on a shaft ele- Motors used to operate load could cause the gearing to back drive and allow hydraulic and vacuum bht shall be continuous unintended movement of the load.
Practical considerations of various work environ- Table Asmw Class ments indicate that the high numbers of load cycles bh Service Class Load Cycles correspond to Service Class 1 and higher commonly 0 0 — 20, equate to usage conditions under which the design 1 20, —factor of Design Category A is inappropriate.
Ambient operating temperature limits A Design Category and Service Class shall be desig- are intended only to be a guideline.
Additional procedures for inquiries may be listed within. I think what I posted above is correct but WillisV and aame posts are right on – buckling isn’t really an issue with lugs like this unless the plate is thin and the lug is really long and extended.
For channels bent about the major axis, I-shape members and channels bent about the strong the allowable compressive stress is given by Eq.
These load conditions are character- 5 0 0 0 1 1 istic of use ame the lifter in work environments where the 10 fref 0 1 1 2 weights of the loads being handled may not be well 25 0 1 1 2 2 known and the lifting operations are conducted in a 50 0 1 2 2 3 more rapid, production oriented manner. This Standard In the absence of similar amse results using other does not attempt to address the many variances with types and grades of bolts, para. Chapter 4 is focused on the design of machine elements and those parts of a lifting device not are contained in the envelope of the below-the-hook lift- covered by Chapter 3.