Hoist Selection

Hoist shall be selected in accordance with ASME HST-1 for Electric Chain Hoists or ASME HST-4 for Overhead Electric Wire Rope Hoists, where you will find important information to consider for the correct selection of your Hoist for vertical lifting service involving material handling or freely suspended loads.

Hoist Duty Service Classification

Service conditions have an important influence on the performance of wearing parts of a hoist such as gears, bearings, rope, sheaves, electrical equipment, brake linings, load and lift limit devices, and wheels. Careful consideration of the Hoist duty service classifications described in this Standard will enable the user to evaluate the application and to obtain a hoist designed for optimum performance and minimum maintenance.

Hoist Duty Class Typical Areas of Application Operational Time Ratings at K = 0.65 Life Expentacy hr
Uniformly Distributed Work Periods Infrequent Work Periods
Max. On Time min/hr Max. Nº Starts /hr Max. On Time from Cold Start min/hr Max. Nº Starts /hr
H1 Powerhouse and utilities, infrequent handling. Hoists used primarily to install and service heavy equipment, where loads frequently approach rated load, and where the hoist is idle for 1- to 6-month periods between periods of operation. 7.5 (12.5%) 75 15 100 1,250
H2 Light machine shop, fabricating service, and maintenance. Loads and utilization randomly distributed. Rated loads infrequently handled. Total running time not more than 12.5% of the work period. 7.5 (12.5%) 75 15 100 2,500
H3 General machineshop, fabricating, assembly, storage, and warehousing. Loads and utilization randomly distributed. Total running time not more than 25% of the work period. 15 (25%) 150 30 200 5,000
H4 High-volume handling of heavy loads, frequently near rated load in steel warehousing, machine and fabricating shops, mills, and foundries, with total running time not more than 50% of the work period. Manual or automatic cycling operations of lighter loads with rated loads infrequently handled such as in heat treating and plating operations, with total running time frequently 50% of the work period. 30 (50%) 300 30 300 10,000
H5 Bulk handling of material in combination with buckets, magnets, or other heavy attachments. Equipment often cab operated. Duty (100%) cycles approaching continuous operation are frequently necessary. User must specify exact details of operation, including weight of attachments. 60 (100%) 600 N/A N/A 20,000

The requirements of this Standard shall be applied together with the requirements of ASME B3016 and ASME B30.17. Please also refer to ASME B3016 and ASME B30.17 for requirements pertaining to marking, construction, and installation; inspection, testing, and maintenance; and operation.