ASME B30.4-2020 pdf free download.Portal and Pedestal Cranes Safety Standard for Cableways, Cranes, Derricks, Hoists, Hooks, Jacks, and Slings
SECTION 4-1.1: SITE PREPARATION AND ERECTION
4-1.1.1 Crane Supports (
a) All load-bearing foundations, supports, and rail tracks shall be constructed or installed to support the crane loads and transmit them to the soil or other support medium. In addition to supporting vertical load, foundations and supports, rail supports excepted, should be designed to provide a moment resisting over- turning equal to a minimum of 150% of the maximum crane overturning moment.
(b) Railsshouldbelevelandstraight,unlessspecifically designed forcurves orgrades, and properlyspaced forthe crane trucks in accordance with the manufacturer’s speci- fications. The trackand supportsystem should have suffi- cient rigidity to limit dynamic oscillations and deviations from plumb.
(c) Rails shall be securely attached to the supporting surfaceinamannercapableofresistingthehorizontaland vertical loads specified by the manufacturer. When appli- cable, provision should be made for thermal expansion and contraction.
(d) Splices in rail tracks (bolted or welded) shall have smooth joints.
(e) When required, a designated portion of the track should be arranged and constructed as an out-of- service parking area complete with means needed for supporting the crane against storm wind effects and anchoring it against unwanted movement along the track; the parkingtrackshould be in place before erection commences.
(f) Rails shall be electricallygrounded when theycarry cranes electrically powered from an outside source.
(g) Both ends ofall tracks shall be provided with stops or bumpers adjusted for simultaneous contact with both sides ofthe travel base unless engineered or administra- tive controls are utilized with dedicated track walkers/ spotters while the crane is traveling.
(h) When more than one crane will be operating on a run of track, particular consideration should be given to the number and disposition of parking areas.
(i) The hazard ofearthquake effects appropriate to the site or zone should be considered.
(j) The crane manufacturer or qualified person shall provide maximum resulting loads at the base of the crane, or wheel loads, for use in design of the supports (see para. 4-1.4.1).
4-1.1.2 General Erection Requirements (a) When cranes are erected, the manufacturer’s or a qualified person’s written erection instructions and a list ofthe weights ofeach componentto be erected shall be at the site.
(b) Cranes shall be erected in accordance with the crane manufacturer’s or a qualified person’s recommen- dations. Erection shall be performed under the supervi- sion of a qualified person.
(c) Procedures shall be established before erection work commences to implement the erection instructions and adapt them to the particular needs of the site. The need for temporary guying and bracing during erection shall be established.
(d) Before crane components are erected, theyshall be visually inspected for damage. Damaged members shall notbeerecteduntilrepairedinaccordancewiththemanu- facturer’s or qualified person’s instructions or replaced.
(e) Slings andliftingaccessories shouldbe selectedand arranged to avoid damaging or marring crane members during erection.
(f) Wind velocity at the site at the time of erection should be considered as a limiting factor that could require suspending the erection operation.
(g) Crane pedestals and gantries should be erected plumb to atolerance thatis specified bythe manufacturer.
(h) Cranes required to weathervane when out of service shall be installed with clearance for the boom and superstructure to swing through a full 360-deg arc without striking any fixed object or other crane.
SECTION 4-1.2: STRUCTURAL DESIGN AND CONSTRUCTION
(a) Structural members shall be designed in accordance with the ANSI/AISC 360-16, or other appropriate design standards such as the Aluminum Design Manual or FEM 1.001.
(b) Welding shall conform to ANSI/AWS D1.1 or ANSI/ AWS D14.3, or ISO 15614-1 when welding is to be performed on load-sustaining members. ASME B30.4 pdf download.ASME B30.4-2020 pdf free download
