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ASME B30.4-2020 pdf download

ASME B30.4-2020 pdf download.Portal and Pedestal Cranes.
Effective Date. The effective date ofthis Volume of the B30 Standard shall be 1 yr after its date of issuance. Construction, installation, inspection, testing, mainte- nance, and operation of equipment manufactured and facilities constructed after the effective date of this Volume shall conform to the mandatory requirements of this Volume. (b) Existing Installations. Equipment manufactured and facilities constructed prior to the effective date of this Volume of the B30 Standard shall be subject to the inspection, testing, maintenance, and operation re- quirements of this Standard after the effective date. Itis notthe intentofthis Volume ofthe B30 Standard to requireretrofittingofexistingequipment. However, when an item is being modified, its performance requirements shall be reviewed relative to the requirements within the current volume. The need to meet the current require- ments shall be evaluated by a qualified person selected by the owner (user). Recommended changes shall be made by the owner (user) within 1 yr. SECTION VI: REQUIREMENTS AND RECOMMENDATIONS Requirements ofthis Standard are characterized byuse ofthe word shall. Recommendations ofthis Standard are characterized by the word should. SECTION VII: USE OF MEASUREMENT UNITS This Standard contains SI (metric) units as well as U.S. Customaryunits.Thevalues statedinU.S. Customaryunits areto beregardedas thestandard. TheSI units areadirect (soft) conversion from the U.S. Customary units. SECTION VIII: REQUESTS FOR REVISION The B30 Standards Committee will consider requests forrevisionofanyofthevolumeswithintheB30 Standard. Such requests should be directed to Secretary, B30 Standards Committee ASME Standards and Certification Two Park Avenue New York, NY 10016-5990 Requests should be in the following format: Volume: Cite the designation and title of the volume. Edition: Cite the applicable edition of the volume. Subject: Cite the applicable paragraph number(s) and the relevant heading(s). boom point: the outward end of the boom. boom stop: a device or structure designed to limit boom travel to its highest allowable position. brake: a device, other than a motor, used for retarding or stopping motion by means of friction or power. bumper: an energy-absorbing device for reducing impact when a moving boom or crane reaches the end of its permitted travel. This is also known as a buffer. cab: the operator’s compartment on the crane. clutch: a means for engagement or disengagement of power.
counterweight: weight used to supplement the weight of the crane in providing stability for lifting loads; it rotates with the superstructure. drum: the cylindrical member around which the rope is wound for lifting or lowering the load or boom. gantry: a movable structural frame consisting ofcolumns andbracingcapableofsupportingacranewithitsworking and dynamic loads. heavy service: service that involves operating at 85% to 100% ofrated load orinexcess of10 liftcycles perhouras a regular specified procedure. in-service: the condition ofa crane readyfor or engaged in work; an operator is at the controls. jib: an extension attached to the boom point to provide added boom length for lifting specified loads. The jib may be in line with the boom or offset to various angles in the vertical plane of the boom. level luffing boom: a type of luffing boom arrangement where the load stays at a constant elevation during luffing of the boom. lightservice:servicethatinvolvesirregularoperationwith loads generally about one-half or less of the rated load limit switch: a device that is actuated by the motion of a part ofa power-driven machine or equipment to alter or disconnect the electric, hydraulic, or pneumatic circuit associated with the machine or equipment.wing (slew): rotation ofthe superstructure formovement ofloads inahorizontal directionabouttheaxis ofrotation. travel truck: the assembly that includes a pivot, frame, axle(s), and wheel(s) on which a crane rides on rails. two-blocking: the condition in which the lower load block or hook assembly comes in contact with the upper load block or boom point sheave assembly. unattended: a condition in which the operatorofa crane is not at the operating controls. weathervaning:wind-inducedswingingofacrane’ssuper- structure, when out of service, so as to expose minimal surface area to the wind.

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