AS 4991-2004 pdf download.Lifting devices.This Standard specifies general requirements for the design, testing, marking and correct care and use of lifting devices that can be fitted directly or indirectly to the hook or any other coupling device on a crane, hoist or winch, as defined in AS 2549, without affecting its integrity.
AS 4991 does not cover lifting equipment such as slings, lifting gear, workboxes and items covered by other Australian Standards.
1.2 LOAD DESIGNATIONS
AS 4991 has been prepared to interf’ace with the design methodology for cranes and the design methodology for lifting tackle. Cranes are specified by virtue of a group classification (C classification) and ‘rated capacity’. Lifting tackles (slings, shackles. etc.) are specified by virtue of a ‘working load limit’ (WLL), which is varied by factors according to the manner and geometry of their application.
AS 4991 allows lifting devices to be specified by either a ‘rated capacity’ or a WLL. Items. such as bins that have a capacity that includes a ‘tare’ as well as a ‘payload’ and ‘gross load’, are described and marked with tare and gross load.
1.3 NEW DESIGNS AND INNOVATIONS
This Standard does not preclude the use of materials, designs, methods of assembly, procedures, and the like, that do not meet a specific requirement of the Standard, or are not mentioned in it, but which can be shown to give equivalent or superior results to those spec I fled.
1.4 INTERPRETATIONS
Questions concerning the meaning. the application or effect of any part of this Standard may be referred to the Standards Australia Committee on Cranes. The authority of the Committee is limited to matters of interpretation and it will not adjudicate in disputes.
1.5 REFERENCED DOCUMENTS
The documents referred to in this Standard are listed in Appendix A.
1.6 DEFINITIONS
For the purpose of this Standard, the definitions in AS 2549 and those below apply.
For examples of lifting equipment, see Appendix B.