This Rigger's Handbook is dedicated to Theodore C - Igor Chudov

YOUR SLING AND RIGGING SPECIALIST
RATIO FOR RATIO FOR
NUMBER BRONZE ANTI-FRICTION
OF PARTS BUSHED BEARING
OF LINE SHEAVES SHEAVES
1 .96 .98
2 1.87 1.94
3 2.75 2.88
4 3.59 3.81
5 4.39 4.71
6 5.16 5.60
7 5.90 6.47
8 6.60 7.32
9 7.27 8.16
10 7.91 8.98
11 8.52 9.79
12 9.11 10.6
13 9.68 11.4
14 10.2 12.1
15 10.7 12.9
16 11.2 13.6
17 11.7 14.3
18 12.2 15.0
19 12.6 15.7
20 13.0 16.4
21 13.4 17.0
22 13.8 17.7
23 14.2 18.3
24 14.5 18.9
HOW TO FIGURE LINE PARTS
HEADQUARTERS: 55 James E. Casey Drive • Buffalo, NY 14206 PHONE: 716.826.2636 FAX: 716.826.4412 www.hanessupply.com
137
Wire Ropes
To help figure the number of parts of line to be used for
a given load or the line pull required for a given load, the
following ratio table is provided with examples of how to
use it:
1
PART
OF LINE
2
PARTS
OF LINE
3
PARTS
OF LINE
USING THE RATIO TABLE RATIO FORMULA
TOTAL LOAD TO BE LIFTED
SINGLE LINE PULL IN POUNDS
Example:
To find the number of parts of line needed
when weight of load and single line pull is
established.
Sample Problem:
72,480 lbs. (load to be lifted)
8,000 lbs. (single line pull) = 9.06 RATIO
Refer to ratio 9.06 in table or number nearest
to it, then check column under heading
"Number of Parts of Line"... 12 parts of line to
be used for this load.
= RATIO
4
PARTS
OF LINE
5
PARTS
OF LINE
Example:
To find single line pull needed when weight of
load and number of parts of line are
established.
Sample Problem:
68,000 lbs. (load to be lifted)
6.60 (ratio of 8 part line)
= 10,300 lbs. (single line pull)
10,300 lbs. single line pull required to lift this
load on 8 parts of line.