ASME HST-1 pdf download.Performance Standard for Electric Chain Hoists.
(a) ASME HST-1 establishes performance requirements for electric chain hoists for vertical lifting service involving material handling of freely suspended (unguided) loads using load chain of the roller or welded link types with one of the following types of suspension:
(1) lug
(2) hook or clevis
(3) trolley
(b) This Standard is applicable to hoists manufactured after the date on which this Standard is issued. It is not applicable to
(1) damaged or malfunctioning hoists
(2) hoists that have been misused or abused
(3) hoists that have been altered without authorization of the manufacturer or a qualified person
(4) hoists used for lifting or supporting people
(5) hoists used for the purpose of drawing both the load and the hoist up or down the hoist’s own load chain(s)
(6) hoists used for marine and other applications as required by the Department of Defense (DoD)
The requirements of this Standard shall be applied together with the requirements of ASME 830.16. Please also refer to ASME B30.16 for requirements pertaining to marking, construction, and installation:
inspection, testing, and maintenance; and operation.
SECTION 1-0.2: DEFINITIONS
abnormal operating conditions: environmental conditions that are unfavorable, harmful, or detrimental to the operation of a hoist, such as excessively high or low tempera. ture. exposure to weather, corrosive fumes, dust laden or moisture laden atmospheres, and hazardous locations.
ambient temperature: the temperature of the atmosphere surrounding the hoist.
beam: an overhead standard structural or specially fabricated shape, on which the trolley operates.
brake: a device, other than a motor, used for retarding or stopping motion by means of friction or power.
brake, holding: a friction brake for a hoist that Is automatically applied and prevents motion when power is off
(a) Select a hoist class from Table 1-1.3.1 based on the general descriptions given in Column 2.
(b) Select a hoist with a rated load equal to or greater than maximum load to be lifted.
(c) Using the information in Columns 3 through 6. select the hoist speed that will meet the operational time ratings for hoist duty class.
(d) Determine value of K. If K is greater than 0.65. select a hoist with a higher rated load rating and recalculate Kto make sure it is equal to or less than 0.65.
(e) lfthe requirements ofthe operational time values In Table 1-1.3-1 and K equal to or less than 0.65 cannot be met, contact the manufacturer.
SECTION 1-1.5: SPECIFICATION OF LIFT, HEADROOM, AND REACH
1-1.5.1 Lift
Most electric chain hoists are manufactured with standard lifts of 10 ft (3.1 m). 15 ft (4.6 m), and 20 ft (6.1 m). One of these standard lifts will normally be adequate for the particular requirement. It is recommended that the purchaser specify the required lift on his/her inquiry or bid request.
1-1.5.2 Headroom
Headroom should be specified if it is important to the application.
1-1.5.3 Reach
Reach should be specified if important to the application.
SECTION 1-1.6: SPEEDS: HOIST AND TROLLEY
Hoisting equipment is available over a wide range of hoist and trolley speeds. Listed in Table 1-1.6-1 are typical speed ranges commonly available. Hoist and trolley speeds may vary ±10% from the specified speed.
NOTE: Table 1-1.6-1 is to be used as a guide only and is not intended to restrict either the manufacturer or buyer from offering or specifying speeds outside the ranges shown, nor should it be inferred that speeds above or below the range shown are not compatible with the required class of hoist
SECTION 1-1.7: TROLLEYS
Hoist trolleys are available in plain, hand-chain-operated, and motor-driven types. Selection of each type depends upon the application.
1-1.7.1 PLain TroLLeys
This type is recommended where trolley motion is infrequent or relatively short. Due to the required force to manually operate this type of trolley.
ASME HST-1 pdf download
