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222 STRENGTH OF .MATERIALS.
Strength of Chains.
The following table gives approximately the weight of
wrought iron chains, in pounds per foot and kilograms per
meter ; and also their strength, with six as factor of safety.
Chains ought to be tested with twice the load given in the
table. Never lose sight of the fact that a chain in use will wear
and consequently become reduced in strength; also, that a
chain is no stronger than its weakest link.
Diameter
Load
Weight in
Load Weight in Kilo-
in Inches. in Pounds. Per Foot. in Kilograms. grams per Meter.
_3_ 280 0.42 125 0.625
X 500 0.91 225 1.35
H 1125 1.5 510 2.22
% 2000 2.5 900 3.72
% 4500 5.8 3050 8.63
l 8000 10 3600 14.88
Strength of Iron Wire Rope.
The following table gives approximately the strength of
iron wire rope, with six as a factor of safety.
Diameter in Inches. Load in Pounds. Load in Kilograms.
n
1000
2500
3500
453
1134
1588
Wire ropes should not be bent over pulleys of very small
diameter. When used for hoisting, the diameter of pulley ought
at least to be 40 times the diameter of rope. For further
information on wire rope see manufacturers’ catalogues.
Strength of Manila Rope.
The size of manila rope is measured by the circumference,
therefore so-called three-inch rope is about one inch in diameter.
New manila rope of three inches circumference will usually
break for a load of 7,000 to 9,000 pounds. For common use
such ropes may be loaded as given in the following table, and
the diameter of the pulley ought to be at least eight times the
diameter of the rope.
Size of Rope. Safe Load in Pounds. Safe Load in Kilograms.
3 ins. circumference.
4 «
5 " "
500
800
1300
227
363
590
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