ASME B30.3-2019 pdf download
ASME B30.3-2019 pdf download.Tower Cranes.
Temporary Construction TowerCranes (Less Than 5 yr) (1) The design out-of-service wind velocity shall be appropriate to the installation site as given in ASCE/SEI 7. Reductions for the short-term duration of a temporary installation can be taken into account per ASCE/SEI 37. (2) The manufacturer shall furnish recommenda- tions on permitted crane configurations at the various wind velocity levels specified in ASCE/SEI 7 for the geographical region. (3) Out-of-service stability requirements may be satisfied by using stabilizers or ballast when necessary, but rail clamps shall not be used for this purpose on rail traveling cranes. (b) PermanentlyMountedTowerCranes(LongerThan 5 yr) (1) The design out-of-service wind velocity shall be appropriate to the installation site as given in ASCE/SEI 7. (2) The manufacturer shall furnish recommenda- tions on permitted crane configurations at the various wind velocity levels specified in ASCE/SEI 7 for the geographical region. (3) Out-of-service stability requirements may be satisfied by using stabilizers or ballast when necessary, but rail clamps shall not be used for this purpose on rail traveling cranes. SECTION 3-1.2: SITE PLANNING (a) Prior to erection, a qualified person shall prepare a siteplan,includingdrawings,thatdefinesthefollowingfor each crane: (1) location ofthe crane base support, indicating the centerline ofthe towerand elevation ofthe top ofthe base support (2) orientation of the base tower, if applicable, for climbing (3) lengths ofthe jib or luffing boom, counterjib, and tail swing High strength bolts used in connections shall be installed and tensioned in accordance with the crane manufacturer’s or a qualified person’s instructions. (g) Bolt tensioning and torquing devices used in the crane erection shall be calibrated in accordance with the device manufacturer’s instructions. (h) Before installing fasteners such as bolts, nuts, or pins, they shall be visually inspected for cracks, necking down, thread deformation, and difficulty in threading a nut by hand. The existence of any of these conditions is reason for rejection of the fastener for further use. Nondestructive testing should be considered to determine ifcracks are present in connecting material. Proper size and grade markings shall be verified and the fastener rejected if these are not present and legible. (i) Crane components shall be loaded for shipping using rigging, blocking, and truck securement methods defined by the manufacturer or a qualified person. Soft- eners shall be used where appropriate to minimize the possibility of damage to crane components. (j) Before crane components are erected, they shall be visuallyinspectedbyadesignatedpersonfordamagefrom shippingandhandling.Damagedstructuralmembersshall notbe erected until evaluated bya qualified person and, if necessary, repaired or replaced in accordance with the manufacturer’s or a qualified person’s instructions. (k) Slings and lifting accessories shall be selected and arranged so as to avoid damaging crane components during erection and dismantling. The attachment points,liftingslings,andaccessoriesshallbeinaccordance with the manufacturer’s or a qualified person’s instruc- tions.
Lifting devices specified and provided by the manu- facturer shall be used unless an alternate method is approved by the manufacturer or a qualified person. Rigging components used shall be in accordance with ASME B30.9, B30.10, B30.20, and B30.26, as applicable. (l) Prior to and during erection/dismantling opera- tions, consideration shall be given rails shall be level and straight in accordance with the manufacturer’s or a qualified person’s specifica- tions, unless designed for curves or grades. Rails shall be spaced for the crane bogies in accordance with the manu- facturer’s or a qualified person’s specifications. (-d) the track and supportsystem shall have suffi- cientrigiditytolimitdynamicoscillations,lateraldisplace- ment, and deviations from plumb to within the manufacturer’s allowable limits. (-e) rails shall be electrically grounded. (-f) both ends ofall rail runways shall be provided with stops or buffers adjusted to ensure simultaneous contact with both rail travel bogies. Stops attached to rails shall be in accordance with the manufacturer’s or a qualified person’s specifications. (2) For cranes mounted to steel structures, (-a) the base tower section should be installed with the steel framework to ensure proper alignment. Use of shims is not permitted to achieve plumbness unless they are approved by and installed in accordance with the manufacturer’s or a qualified person’s instruc- tions. (-b) when templates are used to position steel frame attachments, theyshould be rigid and builtto toler- ances thatplace all tower leg bearing surfaces in the same horizontal plane. (-c) the base section or template shall be oriented as specified in the erection plan. (-d) before erecting the crane, a qualified person shall inspectthe installed steel structure to ensure confor- mity with the design of the support system. (k) Cranes shall be erected to a freestanding height no greaterthan thatspecified bythe crane manufacturer or a qualified person. A reduction in the freestanding height should be considered when erected in seasonal high wind zones as specified byASCE/SEI 7.
