ANSI ASME B20.1 INTERPRETATIONS-2012 Interpretations to B20.1 - Safety Standard for Conveyors and Related Equipment (Includes Interpretations 11 through 24).pdf

1、ASME B20.1 INTERPRETATIONSASME B20.1-2015 INTERPRETATIONSReplies to Technical InquiriesNovember 2012FOREWORDThis publication includes all of the written replies issued between the indicated dates by theSecretary, speaking for the ASME B20 Standards Committee, Safety Standard for Conveyors andRelated

2、 Equipment, to inquiries concerning interpretations of technical aspects of ASME B20.1,Safety Standard for Conveyors and Related Equipment.These replies are taken verbatim from the original letters except for a few typographical andeditorial corrections made for the purpose of improved clarity. In s

3、ome few instances, a reviewoftheinterpretationrevealedaneedforcorrectionsofatechnicalnature;inthesecases,acorrectedinterpretation follows immediately after the original reply.These interpretations were prepared in accordance with the accredited ASME procedures.ASME procedures provide for reconsidera

4、tion 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.ASME does not “approve,” “certify,” “rate,” or “endorse” a

5、ny item, construction, proprietarydevice, or activity.I-1ASME B20.1 INTERPRETATIONSInterpretation: 20-24Subject: ASME B20.1-2012, Para. 6.1.1(a)(7), Return Idlers on Inclined Portion of Belt ConveyorDate Issued: November 14, 2012Question (1): The Standard refers to “inclined conveyors.” Does this me

6、an all conveyors(inclined, declined, and flat) or only inclined conveyors?Reply (1): Paragraph 6.1.1 applies to all belt conveyors fixed in place in all positions andrequiring guarding of nip points and shear points. While para. 6.1.1(a)(7) is a reference to a typicallocation, the requirement is tha

7、t nip points and shear points are to be guarded. See definitionsfor guarded and guarded by location.Question (2): What is the intent and extent of return guarding required in ASME B20.1-2012?Reply (2): See Reply (1).Question (3): Is there a minimum height after which guard return idlers for in-plant

8、 conveyorsno longer need to be guarded (e.g., at 2 ft, no more guarding required)?Reply (3): There is no minimum height requirement. See definitions for guarded and guardedby location.Question (4): Is there a minimum height after which guard return idlers for overland conveyorsno longer need to be g

9、uarded (e.g., at 2 ft, no more guarding required)?Reply (4): There is no minimum height requirement. See definitions for guarded and guardedby location.Question (5): What about idlers inside of truss work?Reply (5): See Reply (1).Question(6):Whataboutidlersthatneedstobeaccessedwhilethebeltisrunning(

10、e.g.,invertedVee training idlers)?Reply (6): See Reply (1). See also para. 5.4.I-2ASME B20.1 INTERPRETATIONSASME B20.1-2009 INTERPRETATIONSReplies to Technical InquiriesJanuary 2007 Through April 2007FOREWORDThis publication includes all of the written replies issued between the indicated dates by t

11、heSecretary, speaking for the ASME B20 Standards Committee, Safety Standard for Conveyors andRelated Equipment, to inquiries concerning interpretations of technical aspects of ASME B20.1,Safety Standard for Conveyors and Related Equipment.These replies are taken verbatim from the original letters ex

12、cept for a few typographicalcorrections and some minor editorial corrections made for the purpose of improved clarity. Insome few instances, a review of the interpretation revealed a need for corrections of a technicalnature; in these cases, a corrected interpretation follows immediately after the o

13、riginal reply.These interpretations were prepared in accordance with the accredited 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

14、 by this interpretation may appeal to the cognizant ASME Committee or Subcommittee.ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietarydevice, or activity.I-1ASME B20.1 INTERPRETATIONSInterpretation: 20-22Subject: ASME B20.1-2000, Para. 6.21.2(b)Date Issued: J

15、anuary 31, 2007Question (1): Does the term “interlocked” mean that the conveyor housing must be constructedwith a “door interlock device” as defined in the ASME A17.1 Safety Code for Elevators andEscalators?Reply (1): No. The term “interlocked,” as used in B20.1-2000, is a verb, which describes theo

16、bjective to be accomplished. It is not meant or intended to require A17.1 type “door interlockdevice.”Question (2): Can the conveyor housing be constructed with a different device, or combinationof devices, that also achieve the level of safety defined in para. 6.21.2(b)?Reply(2): Yes.Anydevicethat

17、willmeetthe performancecriteriaofpara. 6.21.2(b)isacceptable.Interpretation: 20-23Subject: ASME B20.1-1993, Paras. 5.9 and 6.1, Meaning of “Guarded”Date Issued: April 10, 2007Question (1): A belt conveyor is installed in an area where only authorized personnel (technicalandmaintenance)areallowed.Noo

18、peratorsorpublichaveaccessinthearea.Doesthisinstallationsatisfy the intent of para. 5.9.2(a)?Reply (1): ASME does not “approve,” “rate,” or “endorse,” any item, construction, proprietarydevice, or activity. Therefore, the Committee cannot respond to that question. See the definitionfor “guarded by l

19、ocation.”Question (2): Is it correct to say that nip and shear points need not be guarded if they arealready guarded by location?Reply (2): Definition for “guarded” is as follows:Page 5, Definitions: guarded shielded, fenced, enclosed, or otherwise protected by means ofsuitable enclosures, covers, c

20、asing, shields, troughs, railings, or by nature of location so as toreduce foreseeable risk of personal injury.The B20 Standard is performance oriented and does not consider any one methodology ofsafeguarding a hazard to be preferable over another. While slightly different terminology is usedsuch as

21、 “to prevent inadvertent physical contact” or “to reduce the risk of accidental contact,”the standard for safeguarding a nip or shear point hazard is the same. The B20 Standard doesnot support the concept that “redundant” or “secondary” safeguarding is necessary.Question (3): With respect to guardin

22、g of nips and shear points in para. 6.1.1(a) relating to beltconveyors at these typical locations:(a) at terminals, drives, take-ups, pulleys, and snub rollers where the belt changes direction(b) where belts wrap around pulleys(c) at the discharge end of a belt conveyor(d) on transfers and deflector

23、s used with belt conveyors(e) at take-upsIs it correct to say that nips and shear points need not be guarded if they are already guardedby location?Reply (3): See response to Question (2).I-2ASME B20.1-2006ASME B20.1-2006 INTERPRETATIONSReplies to Technical InquiriesFebruary 2004 through July 2006FO

24、REWORDThis publication includes all of the written replies issued between the indicated dates by theSecretary, speaking for the ASME B20 Standards Committee, Safety Standard for Conveyors andRelated Equipment, to inquiries concerning interpretations of technical aspects of ASME B20.1,Safety Standard

25、 for Conveyors and Related Equipment.These replies are taken verbatim from the original letters except for a few typographicalcorrections and some minor editorial corrections made for the purpose of improved clarity. Insome few instances, a review of the interpretation revealed a need for correction

26、s of a technicalnature; in these cases, a corrected interpretation follows immediately after the original reply.These interpretations were prepared in accordance with the accredited ASME procedures.ASME procedures provide for reconsideration of these interpretations when or if additionalinformation

27、is available that the inquirer believes might affect the interpretation. Further, personsaggrieved by this interpretation may appeal to the cognizant ASME Committee or Subcommittee.ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietarydevice, or activity.I-1ASME

28、 B20.1-2006Interpretation: 20-20Subject: ASME B20.1-2003, Section 6.17.2Date Issued: February 24, 2004Question (1): It was noticed that this paragraph was the only conveying method in Section 6 thatincludes the statement “Public Use Intended.” What is the definition of “Public Use Intended”?Reply (1

29、): Section 6.17.2, “Tow Conveyors Public Use Intended” covers a unique type of towconveyor used in commerical stores where shopping carts are towed from one floor to another. Sincethe general public is intended to use/interface with the conveyor, special safety considerations havebeen included in Se

30、ction 6.17.2 to address that unusual situation.Question (2): These questions apply if the above interpretation is that the definition of “PublicUse” would include the trained employee workforce. Tow Conveyor systems are often suppliedin a continuous moving, creeping mode to allow workers to perform

31、various assembly functionsas the cart travels through the work zone. This often necessitates workers crossing the TowConveyor path to access both sides of the cart for assembly purposes. Tow Conveyor speedsthrough the assembly process vary from 0.5 ft/min to 0.75 ft/min. In addition, some systemsope

32、rate in an index and dwell mode. In this mode, workers perform various tasks with the cartstationary at the workstation. After a predetermined amount of time, the conveyor restarts andindexes at a higher rate of speed. This speed varies from 60 ft/min to 90 ft/min. Both of theabove modes have audibl

33、e and visual warnings prior to system start and include appropriatesigns and warnings. What is the intent or interpretation regarding physically restricting peoplefrom the path of the towed vehicle?Reply (2): Section 6.17.2 is not applicable to industrial/commercial tow conveyors used in assemblyapp

34、lications. Those applications are addressed in Section 6.17.1.Question (3): What is the definition of a ramp, or what constitutes a ramp (or as stated in Section7.17.2.2, “incline or decline”)? As an example, is a ramp defined by a particular degree of angle orlength of a ramp as a minimum guideline

35、 or starting point?Reply (3): “Ramp” as used in the B20 Standard is generic, i.e., a “sloping floor, walk, or roadwayleading from one level to another” (Websters Collegiate Dictionary). As stated in the Foreword, theB20 “Standard describes what end result should be achieved without the limiting spec

36、ifications usuallygiven by a design and without the inclusion of finite material selection or dimensions.”Interpretation: 20-21Subject: ASME B20.1-2003, para. 5.11.2(c)(2)Date Issued: July 24, 2006Background: In a system of slider bed conveyors, there are conveyor subsystems with inter-tiedcontrolst

37、otransportbaggagethroughtheairport.Thebagstransferthroughmanydifferentsubsystems.Each subsystem is powered from an independent motor control panel (MCP) and has an independentand unique emergency stopcircuit, with emergency stop push buttonslocated throughout each subsys-tem.Whenonesubsystememergenc

38、ystops,othersubsystemsaresignaledtostopbycomputercontrols.For example, see the following:(a) Subsystem A transfers bags to subsystem B.(b) Subsystem B is emergency stopped.(c) Subsystem A is stopped by control system because subsystem B is emergency stopped.(d) Even though subsystem B is emergency s

39、topped, we may need to bring bags to the transferpoint, so a switch is used to allow subsystem A to run, but the emergency stop on subsystem Bis not affected and still operational.Question: Are other subsystems required to stop through the emergency stop circuit, or can theyjust be programmed to sto

40、p by the computer controls, which can be overridden if needed to transportbags to the transfer point?Reply: Paragraph 5.11.2(c)(2) only addresses the “conveyor concerned,” which may be a singleconveyor or subsystem. The provision does not nor is it intended to address the operation of adjacentconvey

41、ors.I-2Replies to Tech n cal In q u ries December 2001 through May 2003 FOREWORD This publication includes all of the written replies issued between the indicated dates by the Secretary, speaking for the ACME B20 Standards Committee, Safety Standard for Conveyors and Related Equipment, to inquiries

42、concerning interpretations of technical aspects of ACME B20.1, Safety Standard for Conveyors and Related Equipment. These replies are taken verbatim from the original letters except for a few typographical corrections and some minor editorial corrections made for the purpose of improved clarity. in

43、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 ACME procedures. ACME procedures pr

44、ovide for reconsideration of these interpretations when or if additional information is available that the inquirer believes might affect the interpretation. Further, persons aggrieved by this interpretation may appeal to the cognizant ACME Committee or Subcommittee. ACME does not “approve,” cerhfy,

45、“ “rate,“ or “endorse” any item, construction, proprietary device, or activity. 1-1 ASME 820.1-2003 20-17, 20-18 Interpretation: 20-17 Subject: ACME B20.la-1997 Date Issued: December 17, 2001 Question: Section 9-5.6.2 Inspection Records states that ”Where system function would be seriously hindered

46、or adversely affected by the required time delay, or where the intent of the warning may be misinterpreted, a clear, concise, and legible warning sign shall be provided. The warning sign shall indicate that conveyors and allied equipment may be started at any time, that danger exists, and that perso

47、nnel must keep clear.” Does the use of these signs, in a case where the facility has a Lockout - Tagout policy, relieves of the code requirements to have audible or visual warning prior to equipment startup? Reply: ACME and its Committees do not ”approve, rate, or endorse any item, construction, pro

48、prietary device, or activity.“ However, with regard to Section 5.11 and specifically paragraphs 5.11.2)(1) and 5.11.2(b)(2), the following should be clarified. The requirements of 5.11.2(b) only apply to conveyors that, when started, would cause injury to a person doing her/his normal job function,

49、for example a person working in and out of the path of an automotive assembly line. That requirement is not intended to apply to automated conveyor systems that starthtop on a regular basis usually governed by material flow criteria. Personnel are protected from such automated systems by following the other applicable General Safety Standards of Sections 5 and 6. For persons involved in “service or maintenance” related to conveyors and related equipment/systems, the control of hazardous energy is governed by Section 5.11.4, which references the OSHA regulation. Interpretation: 20-18