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The methods of reeving tackle blocks will vary with the applications. With heavy lift cargo booms, cranes and so forth, where blocks with four sheaves or more are required, a number of lead blocks have to be considered. The Brewer- Titchener engineering department will be happy to assist on such applications.
Method of Figuring "Parts of line"
L
------ =E
P
L = Load lifted in pounds
P = Line pull in pounds
E = Efficiency
For example: To figure "Parts of Line
required when load lifted "L" and line pull "P" are known.
32,000 Ibs.
(load lifted "L")
---------------- = 5.3 ("E")
6,000 Ibs.
(line pull "P")
You can see in the table below that an "E" factor of 5.3 requires 6 "Parts of Line".
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