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shapes) outer wires 22 in a manner that creates a mechanical formed by outer wires 22a of strand 10a is maintained. Rope spread the load.illustrated Movementin Replaces Feedwater in system determine how creating to spreadathe load to theso that 30 isHeaters rotation-resistant. In to the embodiment seal 26 thereby tight barrier liquids, chemiinside the building was facilitated Coal-fired Power Plant launch pad foundation. However, cals or other gels cannot penetrate to inner wires 16. The com- figures 19 to 23, wire rope 30 is formed using four compacted the use of air-casters and a called upon toToextract NASA was uncertain about the amount strands. produce through rotation resistant wire ropes, a plurality paction of strand 10 deforms center wire 12 Barnhart and innerwas wires light-slide system. President two old feedwater and replace of load the foundation couldinwithstand. of strands 10 are helically-laid around Barnhart a center (not shown) 16. Lubricant 20 is pressed between and generally fills all of heaters Alan Barnhart planas coal-firedthat power Still24 another challenge was12 deciding mayplant be aninadditional wire or characterized may be emptythe space spaces between center wire and innerthem wires at 16,abetween as less expensive but more tedious than Sioux City, Iowa. Weighing approxihow to erect the lifting structure inner wires 16, and between inner wires 16 and outer wires 22. shown in figures 22 and 23. It will be appreciated by one alternative innovamately each, the new in feedwater beneath the illustrates launch structure, which of skilled the art that wire rope plans. 30 mayThrough compriseitsthree, four Figure 22 an embodiment rope 80 30tons having tive strategy, Barnhart completed the heaters were feet long andstrands 6 feet inarranged also strands can rotate around pad.respectively or more in a spiraled arrangement. four 10a, 10b, the 10c,launch and 10d and 40 havsc ope of its wor k in thr ee d a ys , diameter. The old heaters that23 needed Thisa would that the lifting towers Figure illustrates rope 30 after compaction. Rope 30 ing spiralmean arrangement. Strands 10a, 10b, 10c, and 10d would require two elevations, one at to be extracted from the building were reducing the originally planned plant include a center wire 12a surrounded by twenty-four inner undergoes a compaction process such as, for example, swag124 feet and one at 103 feet – a 21 foot slightly heavier and shorter. The evacuation time by 75 percent. wires 16a surrounded by sixteen outer wires 22a. Strands ing or roller die compaction that further compacts rope 30. difference between jacking points. heaters were originally placed in the Under $150,000: PSC Crane and 10a, 10b, 10c, and 10d have been stranded and compacted After compaction, rope 30 undergoes a black oxide coating Barnhart used Modular Lift Towers building during its construction, when Rigging’s Move and Installation of and are closed together to produce rope 30. As shown in fig- treatment. Any black oxide coating method may be used, and hydraulic jacks to lift and secure the roof was off; however, for several a Diesel Generator Package ure 22, when rope 30 is formed, the mechanical seal 26a such as, for example, cold applied, low temperature, stanthe structure while innovatively taking reasons, the roof could not be opened up Last winter, PSC Crane & Rigging dard high temperature or other appropriate black oxide advantage of the launch pad’s rota- for the replacement. successfully completed a very complex coating method now known or that may be known in the T h e c u s t o m e r ’ s o r i g i n a l p l a n rigging job that began with off-loading tional ability for positioning purposes. future. In order to eliminate the problem of flaking that can Already concerned about the maze of required a high-capacity crane that and transferring an 8 megawatt occur when the blackening is done through a powder coat duct work, piping and steel, Barnhart would have driven up the cost of the Wartsila generator from a rail car onto treatment, the blackened finished of rope 30 occurs through crews also had to worry about high job. Barnhart proposed a less expensive a nine-line Goldhofer trailer. PSC then a black oxide chemical conversion process. winds and lightning prevalent in the alternative that used its 800 ton hauled the 332,000 pound generator – This process may which be adversely affected the black spring. On several occasions, the job capacity Demag TC 3000 measured 44 feetiflong, 10 feetoxide 10 lattice boom chemical is contaminated by zinc contained in inner was shut down at the first sight of truck crane. Both the extraction of the inches wide and 14 feet 2 incheswires high 16. – Therefore, itofisthe important inner wiresPower 16 containing zinc a milethat to the Indian Plant near lightning because nobody involved old heaters and the installation are not exposed chemicals used Rensselaer, Ohio.in the black oxide treatalong to a the wanted to take chances with such an new ones required movement ment. As described hereinabove, this opening is accomplished by first The existing in the buildexpensive, highly technical apparatus. circuitous path through the building to compacting each strand 10. The compaction of strand 10 causes a After successfully completing the and from a hole in an exterior wall ing’s brick façade, which measured theabove flattening (plasticlittle deformation and10shaping) of outer more than feet wide, had towires be grade. project, Barnhart and NASA concluded more than 100 feet 22 and outer wires 22 to butt up (wedge) against one anenlarged before the generator could as 2 cause inches. the launch structure weighed about 5 Clearances were as tight other thereby forming tight mechanical seal 26 and preventing To adjust to inconsistencies in pass through. PSC used a 500 ton J&R million pounds, of which Barnhart thethe liquid black oxideLift-NLock chemical from coming into contact with gantry system equipped flooring throughout building, lifted about 2.5 million pounds. wires 16. The finish theRotator visibility Figure 23: Cross-sectional view of the four strands of secondt embodiwith a 400 ton decreases J&R Power toof Barnhar en gin eerinner s developed a blackened $150,000-$750,000: Barnhart rope 30 for use in theatrical stage productions. WRN ment after compaction. Wire Rope News & Sling Technology
August 2006
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