Danger of Hanging Slit Coils by Pipe@@@@HOME@‹ZpŽ‘—ΏŽΊ @‹Zp—pŒκ
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@If slit coils are hung by pipe as in the right figure, there will be high risk of buckling in the pipe, unless the pipe is strong enough.
The stress in the pipe can be calculated as below.
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@Slit coils should be considered to give an independent load to the pipe, even if they are strapped together.
@The maximum stress in the pipe can be calculated by the following formula.

@@@@Bending MomentFMmax=W^Lp~(Lo+Lc^2)~{Lo+(2~Lo~Lc+Lc2)^i4~Lp)}
@@@@Section ModulusF Z=ƒΞ^32~(d24|d14)^d2
@@@@StressFƒΠmax=M^Z

@The results of several case studies are listed in the table below.
Case Study 1 2 3 4 5
Total Load Weight Wikgj 8,000 8,000 10,000 10,000 15,000
Total Load Width Lcimmj 900 1,000 900 1,000 1,000
Pipe Length Lpimmj 1000 1,200 1000 1,200 1,200
iLc|Lpj^2 Lo(mm) 50 100 50 100 100
Pipe Inner Diameter d1immj 100 100 100 100 100
Pipe Outer Diameter d2immj 120 120 120 120 120
Maximum Moment Mmax. 1,100,000 1,400,000 1,375,000 1,750,000 2,625,000
Section Modulus Z 87,789 87,789 87,789 87,789 87,789
Maximum Stress ƒΠmax. 12.5 15.9 15.7 19.9 29.9
Allowable stress after fatigue 6`10 kg^mm2
@In every case in the above table, the maximum stress in the pipe is beyond the allowable limit. It will become more dangerous as fatigue progresses.
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