ASME B30 21 INTERPRETATIONS-1992 Interpretations to B30 2-1994 Manually Lever Operated Hoists《B30 2-1994的说明 手动操作杆式提升机》.pdf
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1、ASME B30.21-1994 Interpretations Replies to Technical Inquiries December 1989 - December 1992 FOREWORD This publication includes all of the written replies issued between the indicated dates by the Secretary, speaking for the ASME B30 Committee, Safety Standards for Cableways, Cranes, Derricks, Hois
2、ts, Hooks, Jacks, and Slings, to inquiries concerning interpretations of technical aspects of ASME B30.2 I, Manually Lever Operated Hoists. These replies are taken verbatim from the original letters except for a few typographical corrections and some minor editorial corrections made for the purpose
3、of improved clarity. In some few instances, a review of the interpretation revealed a need for corrections of a technical nature: in these cases a corrected interpretation follows immediately after the original reply. These interpretations were prepared in accordance with the accredited ASME procedu
4、res. ASME pro- cedures provide for reconsideration of these interpretations when or if additional information is available which the inquirer believes might affect the interpretation. Further, persons aggrieved by this interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME d
5、oes not “approve,” “certify.” “rate,” or “endorse” any item. construction, proprietary device, or activity. I ASME B30-23A 95 0757b70 0574344 790 m 830.21 Interpretations 21-1 Interpretation: 21-1 Subject: ASME B30.21-1989 Date Issued: December 15, 1992 Question (1): Does the Standard prohibit a lev
6、er operated hoist from being used as a sling or load binder? Reply (I): The B30.21 Standard does not specifically prohibit the use of a lever operated hoist as a sling or load binder. The requirements for the use of the hoist are stated in Section 21-0. I - Scope, and in the text, and particularly i
7、n Sections 2 I - 1.7, 2 1-2.6, and 2 I -3.6 - Operation . These requirements, in particular, and the others found in the B30.21 Volume must be met when the hoists are used as a sling or a load binder. Section 21-0.1 - Scope of B30.21 Within the generd scope defined in Section 1, B30.21 applies to ma
8、nually lever operated hoists utilizing chain (see Fig. I), wire rope (see Fig. 2), and web strap (see Fig. 3) for the purpose of lifting, pulling, and tensioning applications, comprising hoists of the following types: (a) ratchet and pawl operation (b) friction brake operation Lever operated hoists
9、of other types than those detailed in this volume shall be used only in accordance with Hoists used for lifting personnel require special considerations and are not included in this Volume. Specially insulated hoists used for handling electrically energized power lines require special considcrations
10、 and are not included in this Volume. recommendations of the hoist manufacturer. 21-1.7.2 Before Operating Hoist (k) Hoists shall not be operated by other than hand power of one operator. 21-1.7.3 Handling the Load (a) The hoist chain shall not be wrapped around the load. (g) Hoists shall not be ope
11、rated until the load block, chain, and hoist body are directly in line with the direction of loading to avoid side pull. (h) The hoist body or frame shall not bear against any object or the supporting structure. (r) The operator should not leave a loaded hoist unattended unless specific precautions
12、have been instituted and are in place. 21-2.6.2 Before Operating Hoist (k) Hoists shall not be operated by other than hand power of one operator. 21-2.6.3 Handling the Load (a) The hoist wire rope shall not be wrapped around the load. (f) Hoists shall not be operated until the load block, wire rope,
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