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Page Title: Safe Work Areas
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Figure 3-2.–Safe work areas. 5.  Do  not  mix  lines  of  different  materials  or constructions.  This  is  an  unsafe  practice  because unequal  stretch  results  in  unequal  loading. 6. Shiphandlers and linehandlers should be made aware the new aramid line is a low-stretch line and that it does not neck down appreciably when put under a strain. The strain should be carefully controlled to avoid excessive tension. This is best accomplished by having linehandlers check the line frequently until they have the feel of it. 7. As with all other lines, it is recommended you use chafing gear where aramid lines pass through chocks. If the cover of any strand of the aramid line is abraded to the extent that the inner fibers are visible but not damaged, the strand or entire line may be served with marline  or  synthetic  cord.  If  the  inner  fibers  are damaged, you must cut out that section of the line and re-splice  it. The three following safety rules for line-handling must be heeded regardless of the line fiber material: 1.   Never stand in the bight of a line or in the direct line of pull when the line is being pulled or under tension. See figure 3-2 for an example of bight areas. 2. Never continue to increase the load on a line after the rigs have been two-blocked or tightened. Many injuries  and  fatalities  have  occurred  when  operators have  not  observed  this  rule. 3.   Remember: A safety observer is a must in every case where lines are being worked. Before using new three-strand synthetic fiber line, it should be faked down on deck and allowed to relax for 24 hours. The shorter the line, the less time the relaxing process takes; for example, a length of less than 50 feet will relax in 1 hour. When wet, synthetic line shrinks slightly but does not swell or stiffen. When the line is tensioned, the water squeezes out; and under working loads, it appears as vapor. Because line under tension develops friction and, thus, heat, the water has a beneficial cooling effect. Nylon differs from natural fiber line in that it stretches under load, yet recovers to its normal size when tension is removed. With plain-laid and cable-laid nylon, a stretch of one-third of its length is normal under safe working loads. A stretch of 40-percent of its length is the critical point, and it parts at 50-percent stretch. With  double  braided  nylon,  the  critical  point  is  reached when the line is stretched 27 percent; it parts when the stretch is 30 percent. This elongation at times may be a disadvantage, but it can be reduced by doubling up the lines by passing bight. Nylon line can stand repeated stretching  with  no  serious  effect. Sharp, cracking noises, caused by readjustment of the strands, are heard when applying a load to new cable-laid hawsers. Nylon line that has been under 3-5

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