1、ASME B30.23 INTERPRETATIONSASME B30.23INTERPRETATIONSReplies to Technical InquiriesSeptember 2006 Through January 2010FOREWORDThis publication includes all of the written replies issued between the indicated dates by theSecretary, speaking for the ASME B30 Standard Committee, Safety Standard for Cab
2、leways,Cranes, Derricks, Hoists, Hooks, Jacks, and Slings, to inquiries concerning interpretations oftechnical aspects of ASME B30.23, Personnel Lifting Systems.These replies are taken verbatim from the original letters except for a few typographicalcorrections and some minor editorial corrections m
3、ade for the purpose of improved clarity. Insome instances, a review of the interpretations revealed a need for corrections of a technicalnature. In these cases, a corrected interpretation follows immediately after the original reply.These interpretations were prepared in accordance with the accredit
4、ed ASME procedures.ASME procedures provide for reconsideration of these interpretations when or if additionalinformation is available that the inquirer believes might affect the interpretation. Further, personsaggrieved by an interpretation may appeal to the cognizant ASME committee or subcommittee.
5、ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietarydevice, or activity.I-1ASME B30.23 INTERPRETATIONSInterpretation: 23-3Subject: ASME B30.23-2005, Para. 23-3.2.2(a)(15)Date Issued: September 21, 2006Question(1):Doestherequirementtoengagepower-controlledlower
6、ingatalltimestheplatformis occupied, as stated in para. 23-3.2.2(a)(15), only apply during lowering operations?Reply (1): The intent of the requirement is to ensure that any intentional or unintentionalmotion control actuations will not initiate an uncontrolled lowering motion of the platform.Depend
7、ing upon the control configuration of the crane being considered, the response to yourquestion could be either “Yes” or “No.”Question (2): Can a crane whose hoist drum is controlled by a hoisting clutch, lowering clutch,and foot-operated brake be used to lift personnel if the appropriate clutch is e
8、ngaged duringhoist drum operation?Reply (2): No, with only this hoisting train configuration, the crane does not meet the require-ments ofpara. 23-1.2.2(a) asthe “free fall”has not beenmade “inoperable”; itis simply “notin use.”Question (3): Why do paras. 23-1.2.2 (a) and (f), Hoisting Equipment, se
9、em to prohibit thispractice, but para. 23-3.2.2(a)(15), Hoisting Equipment Operator, appears to allow the practice aslong as the lowering clutch is engaged?Reply (3): Paragraph 23-1.1.1 is a design requirement that a crane must meet prior to beingused for lifting people and para. 23-3.2.2(a)(15) is
10、an operating control requirement placed uponthe operator for while the crane is actually involved in lifting people.Question (4): Can a crane whose hoist drum is controlled by a hoist clutch and torque converterbe used to lift personnel if the clutch and torque converter are used during hoisting and
11、 loweringoperations?Reply (4): Yes, provided the other crane chracteristics, configurations, and operating require-ments that are specified in the Volume are satisfied.Question (5): Can a machine that is capable of “free fall” be used to lift personnel if the“free-fall” capability is not used during
12、 basket operations?Reply (5): No. As stated in Question (2), the free-fall capability must be made “inoperable.”Paragraph 23-1.2.2(a) specifies an “inoperable” free-fall capability that would require the craneto havea controlling devicethat was independentof the cranesmotion controls andthat preclud
13、ed“free fall” if the cranes motion controls were activated.I-2ASME B30.23 INTERPRETATIONSInterpretation: 23-4Subject: ASME B30.23-2005, Para. 23-2.2.1(b), Proof TestingDate Issued: November 15, 2007Background: Paragraph 23-2.2.1(b) states, “At each new job site, prior to hoisting people inthe person
14、nel platform, the platform and rigging shall be proof tested to 125% of the platformsrating.”Question (1): What is meant by term “each new job site”?Reply (1): Paragraph 23-2.2.1(b) tests the integrity of the personnel platform to identify anydamage that may have occurred during transportation and h
15、andling from one job site to another.Question (2): When personnel and lifting equipment are moved from one area work face toanother, are frequent and periodic inspections sufficient in lieu of trial lifts?Reply (2): No. Trial lifts are required in para. 23-3.2.2(a)(9) prior to lifting on each shift
16、andafter any change of setup location, hoist configuration, or operator.Interpretation: 23-5Subject: ASME B30.23-2005, Paras. 23-2.2.1(b)(1) and (b)(3)Date Issued: January 28, 2010Question (1): Paragraph 23-2.2.1(b)(1), Proof Testing (1998), provides in part, “At each new jobsite, prior to hoisting
17、people in the personnel platform, the platform and rigging shall be prooftested to 125% of the platforms rating.” What is the meaning of the phrase?Reply (1): The test for “each new job site” as required in B30.23-2005 para. 23-2.2.1(b)(1) isbased on the physical location of the job. A new job site
18、occurs when the locale change requirestransit of the personnel lifting system beyond the current job site.Question (2): Does ASME B30.23 or any similar standard apply to personnel lifting platformsmounted on the booms of derricks?Reply (2): Yes, for equipment covered in the B30 Standard.Question (3)
19、: Does ASME B30.23-2005 require proof testing of boom-attached personnel liftingplatforms used in construction?Reply (3): Yes. Proof-testing requirements for boom-attached platforms are stated inpara. 23-2.2.1(b)(3) and are not industry specific.I-3ASME B30.23 INTERPRETATIONSInterpretation: 23-6Subj
20、ect: ASME B30.23-2005, Para. 1.2.2(f)Date Issued: June 23, 2010Background: Paragraph 23-1.2.2(f) states: “Hoisting equipment shall have automatic brakessuch that when the equipment operating controls are released, the motion are brought to rest.”Question: Does this pertain to crane swing systems? Nearly all cranes have what is referredto as free swing systems. This allows the boom point to center itself over the load when makinga lift?Reply: The Subcommittee did not consider swing during the development of this languageand will address the issue in the next revision.I-4
