ASME B30.7 pdf download BASE- MOUNTED DRUM HOISTS
lf adopted for governmental use，the references toother national codes and standards in the specific vol-umes may be changed to refer to the correspondingregulations of the governmental authorities.
The use of cableways, cranes, derricks, hoists,hooks,jacks，and slings is subject to certain hazards thatcannot be met by mechanical means but only by theexercise of intelligence,care,and common sense. It istherefore essential to have personnel involved in theuse and operation of equipment who are competent,careful,physically and mentally qualified，and trainedin the safe operation of the equipment and the handlingof the loads. Serious hazards are overloading, droppingor slipping of the load caused by improper hitchingor slinging，obstructing the free passage of the load,and using equipment for a purpose for which it wasnot intended or designed.
The Standards Committee fully realizes the im-portance of proper design factors,minimum or max-imum sizes,and other limiting dimensions of wirerope or chain and their fastenings，sheaves，sprock-ets,drums,and similar equipment covered by theStandard,all of which are closely connected withsafety. Sizes，strengths，and similar criteria are de-pendent on many different factors，often varying withthe installation and uses. These factors depend onthe condition of the equipment or material; on theloads; on the acceleration or speed of the ropes，chains,sheaves,sprockets, or drums; on the type of attachments;on the number, size, and arrangement of sheaves or other parts; on environmental conditions causing corrosion orwear; and on many variables that must be consideredin each individual case.The rules given in the Standardmust be interpreted accordingly, and judgment used indetermining their application.
Some of the provisions of this Standard requirecompliance with information found in manuals or otherdocuments supplied by the manufacturer with the equip-ment. The information includes recommendations，re-quirements，and instructions (e.g.，“the reeving shallbe checked for compliance with the recommendationsof the manufacturer”‘).
Compliance with the provisions should not precludethe possibility of consulting a qualified person.Thisis true particularly when: the’equipment has beenaltered,repaired, or modified; the manuals or documentssupplied by the manufacturer are no longer available;or the manufacturer or a successor is no longer inbusiness and the manuals are no longer available.However,the purpose of consulting a qualified personshall not be to avoid contacting the manufacturer andusing the information supplied by the manufacturer.The Standards Committee wilil be glad to receivecriticisms of this Standard’s requirements and sugges-tions for its improvement，especially those based onactual experience in application of the rules.
Suggestions for changes to the Standard should besubmitted to the Secretary of the B30 Committee,ASME，Three Park Avenue，New York,NY 10016-5990,and should be in accordance with the followingformat:
a ) cite the specific paragraph designation of thepertinent volume;
(b) indicate the suggested change (addition,deletion,revision,etc.);
(c) briefly state the reason and/or evidence for thesuggested change;
(d) submit suggested changes to more than one para-graph in the order that the paragraphs appear in thevolume.
The B30 Committee will consider each suggestedchange in a timely manner in accordance with itsprocedures.
Section l: Scope
This Standard applies to the construction, installation,operation, inspection,and maintenance of jacks; power-operated cranes，monorails，and crane runways; power-operated and manually operated derricks and hoists;lifting devices，hooks，and slings; and cableways.