Electric Chain Hoist : Reference

Calculation formulas for the chain hoist selection

Max. No. of starts per hour, Duty factor and Load ratio should be studied besides specifications of the chain hoist.

(1)
(1)	•Calculation Example No. of starts are total of inching, thus it is calculated by assuming the No. of inching for lifting or lowering.
(2)
(2)	•Calculation Example
(3)
(3)	•Calculation Example When a 0.4t load is suspended on a 1-ton rated load electric chain hoist for a one-way trip, with a no-load return trip. (Lifting sling is 0.3t) Load condition is Medium, and the mean operating time per day will be within two hours. , One size up chain hoist must be selected in case it is used over the time.

	No. of inching per lifting or lowering
	No. of transfer per hour
	Lifting height
	Hoisting speed
	Each transfer time ratio to the total operating time
	Each load ratio to the rated load