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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Handrails should be constructed of I'k-inch diameter steel or aluminum Schedule 40 <br />lor equivalent) pipe, with a minimum top rail height of 42 inches. <br /> <br />Galvanized steel grating is recommended for placement over bay openings in <br />structures and replacement of various timber walkwoys. It should hove a rough or <br />serrated wolking surface and an open design to permit drainage of water and other <br />fluids. The grating is intended to provide sure footing for operation of gates and other <br />operation and maintenance work in various weather conditions. <br /> <br />Gate Hoists. A common problem throughout the canal system is a difficulty in gate <br />operation. Although this difficulty is due partly to disrepair of the gates, it is also a <br />result of problems with the gate hoists themselves. Corrections to this problem are <br />based on the following two criteria: <br />I. Where gate hoists are present Iy inoperable or where operation requires <br />considerably more than 40 Ibs. effort on the crank or handwheel, it is <br />recommended that the hoist be rehabilitated or replaced os necessary; <br />2. Gates which require frequent operation or operation in emergency situations <br />should, where possible, be power-operated. <br /> <br />Repair/Replacement of Gate Hoists. All gates should operate with no more <br />than 40 Ibs. effort on the cronk or handwheel, and should be repaired or replaced, <br />depending upon the degree of difficulty of their operation. In order to provide <br />reliable and convenient operation, the following recommendations ore mode <br />concerning gate hoist replacements: <br />I. All new radial ond check gate hoists should be drum and coble hoists with <br />handwheel operators; <br />2. All new slide and sluice gate hoists should be one or two-speed crank- <br />operated hoists with threoded stems, and should be compatible with the <br />portable power unit to be discussed below; <br />3. Where practical, all of the existing "jack" type hoists (e.g. the slide gate <br />hoists at the Horse Creek flume wasteway) should be replaced with crank- <br />operated hoists and threaded stems, os discussed in Item 2 above. This will <br />provide continuity throughout the system as well os easier and more reliable <br />operation; <br />4. All new hoists should have stern covers and enclosed gears, and should be <br />operable with identical handwheels or cronks, depending on hoist type. <br /> <br />17 <br />