ASME B30.20-2010 pdf download
ASME B30.20-2010 pdf download.Below-the-Hook Lifting Devices.
(c) Horizontal Surface Lifts. The rated load shall not be greater than 50% of the UPC for horizontal surface lifts.
(d) Vertical Sutface Lifts. The rated load shall not be greater than 25% of the UPC for vertical surface lifts.
(e) Load Type. These factors are for clean, flat, dry, nonporous loads, and shall be increased as required by the surface conditions of materials to be lifted.
(fi Vacuum Reserve’ System. The vacuum lifting device shall incorporate a vacuum reservoir of sufficient size to prevent the vacuum level under the pads from decreasing more than 10% in 4 mm with power off on a clean, dry, and nonporous load. The vacuum lifting device shall be designed so that when in operation, all available vacuum reservoirs of the machine shall be channeled to the vacuum pads in use during a “vacuum-power-off” condition.
(g) Vacuum Lifter Structural Design. The manufacturer shall verify that vacuum lifting devices are designed by or under the direct supervision of a qualified person. The design shall be in accordance with ASME BTH-1 and shall consider the stresses resulting from the application of rated load plus the weight of the vacuum lifting device.
Vacuum lifting devices shall be designed to ASME BTH-1 Design Category B (static strength criteria) and the proper Service Class (fatigue life criteria) selected for its number of load cycles unless a qualified person representing the owner, purchaser, or user of the lifting device determines and can demonstrate that ASME BTH-1 Design Category A is appropriate.
Design Category A shall only be designated when the magnitude and variation of loads applied to the vacuum lifter are predictable and do not exceed the rated capacity, where the loading and environmental conditions are accurately defined, service is not severe, and the anticipated number of load cycles does not exceed Service Class 0.
(Ii) Welding. All welding shall he in accordance with ANSI/AWS D14.1 and ASME BTH-1.
(i) Power Disconnects
(1) Hoisting equipment using an externally powered vacuum lifter shall have a separate vacuum lifter circuit switch of the enclosed type with provision for locking, flagging, or tagging in the open (off) position. The vacuum lifter disconnect switch shall be connected on the line side (power supply side) of the hoisting equipment disconnect switch.
(2) Disconnects are not required on externally powered vacuum lifters operating from a 120 V AC single-phase power source.
(7) Alterations. Vacuum lifters may be altered or rerated, provided such alterations are analyzed and approved by the equipment manufacturer or a qualified person. A rerated lifter or one whose components have been altered shall conform to this para. 20-2.2.2 and be tested according to para. 20-2.3.8. The new rated load shall be displayed in accordance with para. 20-2.2.1(a).
20-2.3.1 Inspection Classification
(a) Initial Inspection
(1) New and reinstalled vacuum lifters shall be inspected by a designated person prior to initial use to verify compliance with applicable provisions of this Volume.
(2) Altered or repaired vacuum lifters shall be inspected by a designated person. The inspection may be limited to the provisions affected by the alteration or repair, as determined by a qualified person.
(b) Inspection Intervals. Inspection procedure for vacuum lifting devices in regular service is divided into three general classifications, based upon the intervals at which inspection should be performed. The intervals, in turn, are dependent upon the nature of the critical components of the vacuum lifting device and the degree of their exposure to wear, deterioration, or malfunction. The three general classifications are designated as every lift, frequent, and periodic, with respective intervals between inspections as defined below.
(1) Every Lift Inspection. Visual examination by the operator before and during each lift made by the vacuum lifting device.
(2) Frequent inspection. Visual examinations by the operator or other designated persons with records not required.
