Choosing the right Prowinch hoist

Selecting a suitable hoist for the job required is critical. In your search for the correct hoist, it's wise to utilize the standards of ASME HST-1 for Electric Chain Hoists or ASME HST-4 for Overhead Electric Wire Rope Hoists. These standards will assist you in finding important information to consider for the correct selection of your hoist, helping you optimize vertical lifting requirements involving various material handling or freely suspended loads.

Hoist Duty Service Classification

The performance of internal components is a direct result of the conditions a hoist is subjected to. To choose the correct hoist, first consider the demands the hoist will be under. Also, keep in mind the potential wear on gears, bearings, rope, sheaves, electrical equipment, brake linings, load and lift limit, and other factors. Careful consideration of the hoist duty service classifications described in this standard will enable the user to evaluate the application and purchase a hoist designed for optimum performance. The purchase of the right Prowinch hoist will help you get the job done.

Typical areas of application

H1: Heavy load use and utilities and infrequent use: Hoists are 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.

H2: Light machine shop, fabricating service, and maintenance with randomly distributed loads and utilization. Rated loads infrequently handled. A total running time is less than 12.5% of the work period.

H3: General machine shop, fabricating, assembly, storage, and warehousing. Loads and utilization are infrequent. Total running time is less than 25% of the work period.

H4: High-volume handling of heavy loads, frequently approaching rated load, such as steel warehousing, machine and fabricating shops, mills, and foundries, with a total running time of less than 50% of the work period. Manual or automatic cycling 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.

H5: Bulk handling of material in combination with buckets, magnets, or other heavy attachments. Equipment is often enclosed, and cab operated. Usage is typically 100% and approaching continuous operation. The user must specify the exact details of the process, including the weight of the attachments for proper selection of the unit.

Hoist Duty Class Typical Areas of Application Operational Time Ratings at K = 0.65 Life Expectancy 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

These standards must be applied together with ASME B3016 and ASME B30.17. Also, please refer to ASME B3016 and ASME B30.17 for marking, construction, installation, inspection, testing, maintenance, and operation.