Document X8wL8ZjZ9V3jx51vXRYm508Rx
FILE NAME: National Safety Council (NSC) DATE: 1966 Apr DOC#: NSC043 DOCUMENT DESCRIPTION: Excerpt - NSC - National Safety News
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i& A -JI Accident Prevention in the Industrie I Kitchen
New Sarety Tool from Aero space Research-. The Fault Tree An rilysis
An, in this issue: Industrial Conference Report Safeguarding Dump Trucks * Summary o- 1965 Accident Experience " Sewer Rise Cleaning Safety
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f . GOOD INVESTMENTEN SAFETY
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CIRCLE 15 ON READER CARD 6
in old National Safety Councilr Practices Pamphlet Number "Fiber Rope." Even here no chanical testing as such is rec mended except that "scaffold, other rigging involving human I ty should be tested with a load least three times that which it w carry in service. However, this! should not be more than t' feet off the ground when the t is made."
Your opinion of the above pr cedure, especially on the ro~ stretching aspect, would be ; cerely appreciated.
Answer: We are assuming tlf' you are referring to manila ror The 5th edition of our Accictg Prevention Manual gives the lowing breaking strengths and 'P loads for manila rope:
Diameter
Va"
W 1"
Average Breaking Strength
(lbs.)
2,650 lbs, 5,400 lbs. 10,500 lbs.
S a fe Work) Load (20 P C an t of Minii B re a k in g Stre
] , "
530 lbs 1,080 lbs
2,100 lbs. '3
The manual does not recommerf strain testing of fiber rope, fp the reason that such testing m i
itself damage the rope and weak'' it further. However, if it were ie.. sible to cut off a short sectionfr the end of the suspected rope an test it to destruction, it would the be feasible to apply the usual s~
ty.' -factar,-. of five to the strain' which TEehrope broke.
The^mahual recommends visp inspection every 30 days under-6 dinary conditions, and daily insp,
tion if exposed to acids or cans To quote:
"Inspection should mean exan tion of the entire length of the for wear, abrasions, broken or fibers, displacem ent of yarns strands, variation in size or rou ness of strands, discoloration, rotting. To inspect the inner fi the rope should be untwisted in eral places to see whether the inn yams are bright, clear, and unspott . . . A rope that has lost its feel pliability or stretch, or in which fibers have lost their luster and pear dry and brittle, should be placed by new rope."
So far as our old, discontinu
Safe Practices Pamphlets are co
cemed, we prefer that they not
used for reference purposes.
National Safety News, April 1