ASME B30.21 pdf download.Manually Lever Operated Hoists.
Volume B4.21 includes provisions that apply to the construction, installation, operation, inspection, and mamtenance of ratchet and pawl and friction brake type manually lever operated chain, wire rope, and web strap hoists used for lilting, pulling, and tensioning applications. (See Figs. I through 3.)
The requirements for a hoist that is used for a special purpose, such as lilting personnel, or drawing both the load and the hoist up or down the load chain, rope, or web strap when the hoist is attached to the load, and a specially insulated hoist used for handling energized electrical power lines are not included in this volume.
SECTiON 21-0.2: DEFINITIONS
alnwrmal operatin’ conditions: environmental conditions that arc unfavorabic, harmful, or detrimental to or for the operation of a hoist, such as excessively high or low ambient temperatures, exposure to weather, corrosive fumes, dust laden or moisture laden atmospheres, and hazardous locations.
administrative or regulatory authorih’: governmental agency or the employer in the absence of governmental jurisdiction.
ambient temperature: the temperature of the atmosphere surrounding the hoist.
appointed: assigned specific responsibilities by the employer or the employer’s representative.
blxk, load: the assembly of hook or shackle, swivel, bearings, sheaves, sprockets, pins, and frame suspended by the load chain, wire rope, or web strap. This shall include any appurtenances reeved in the load chain, wire rope, or web strap (see Fig. 4).
brake: a dcv icc for retarding and stopping motion of the load (see load controlling mechanism).
chain, load: the load-bearing chain in a hoist.
chain, roller: a series of alternately assembled roller links and pin links in which the pins articulate inside the bushings and the rollers are free to turn on the bushings.
(7) supporting structure or trolley, if used, for evidence of damage
(8) labels, required by para. 21-1.1.4, for legibility and replacement
(9) end connections of load chains for evidence of wear, corrosion, cracks, damage, and distortion including overtravel restraints
(1W the hoist and hoist mounting for evidence of missing items
21-1.3.4 Hoists Not in Regular Service
(a) A hoist that has been idle for a period of one month or more, but less than one year, shall be given an inspection conforming with the requirements of para. 21-1.2.2 before it is placed in service.
(1’) A heist that has been idle for a period of one year shall be given an inspection conforming with the requirements of para. 21-1.2.3 before it is placed in service.
SECTION 21-1.4: TESTiNG
21-1.4.1 OperatIonal Tests
All new hoists shall be tested by the hoist manufacturer, All altered or repaired hoists, or heists that have not been used within the preceding 12 months, shall be tested before being placed in service by, or under the direction of, a designated person to ensure compliance with this volume, including the following:
(a) All functions of the hoist shall be checked with the hoist suspended in the unloaded state. (Some hoists may require a nominal load or pull on the load hook to test the lowering motion.)
(b) After testing in the unloaded state, a load of at least 100 lb (46 kg) times the number of load-supporting parts of chain shall be applied to the hoist in order to check proper load control.
21-1.4.2 Load Test
(a) New hoists shall be tested by the manufacturer with a test load of at least 125% of the rated load.
(b) A hoist in which load-suspension parts have been altered, replaced, or repaired should be statically or dynamically load tested.
(1) A qualified person shall determine the need to load test the hoist.
(2) A written report of the test should be prepared and pLaced on file.
(3) The test load shall not be less than 100% of the rated load of the hoist or more than 125% of the rated load of the hoist unless otherwise recommended by the hoist manufacturer or a qualified person.
ASME B30.21 pdf download
