Bow crane procedures for deploying workboat

Section III. Operating instructions - TM-55-1930-209-14P-13_62

TM-55-1930-209-14P-13 Water Purification Barges (1930-01-234-2165) Equipment Montoring System Manual
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TM 55-1930-209-14&P-13 f. On forward weather deck, visually check exposed hardpiping and flexible hydraulic lines for cracks or leaks. Check crane base (Figure 3-7) to ensure that it is secure and make sure forward weatherdeck is clear of any material that might obstruct bow crane movement. Inspect hold-down bolts for damage and check for tightness. If tightening is required, tighten to 350 foot pounds. CAUTION The anti-2-block horn must be activated. This system is an emergency switch that prevents the hook block from hitting the boom nose. g. On deckhouse top, inside watertight control box, make sure anti-2-block system HORN ON/OFF switch (Figure 3-4) is ON. Make sure that warning light is OFF. h. Push START button on START/STOP control station inside watertight control box. High pitched whine of hydraulic pump indicates that crane is ready for use. WARNING S Sheave block must be installed before using bow crane winch to lift loads of more than 10,000 lb. Maximum lift for crane winch with sheave block installed must not exceed 20,000 lb. i. Install sheave block when using bow crane winch to lift loads in excess of 10,000 lb. j. Using crane control levers (Figure 3-2 for Barge 1 and Figure 3-3 for Barges 2 and 3), deploy crane from traveling position and exercise crane, without load, as follows: Extend all booms to their maximum length and slew crane around in one complete circle. During these movements, check for any change in pitch of hydraulic pump noise and any jerky, sticking or uneven movements of any part of the crane. Note such symptoms and check crane carefully before using. 3-12 Bow crane procedures for deploying workboat WARNING Non-Commissioned-Officer-in-Charge (NCOIC) must control boat movement by supervising crane operator and crew members on control lines. Crane operator cannot see all portions of workboat movement. To control crane movement, NCOIC uses hand signals (Figure 3-5) or walkie-talkies to direct crane operator. a. Turn crane counterclockwise and extend boom over center of workboat in its cradle on deckhouse top. b. Make sure two seawater drain plugs on bottom of workboat hull are installed with properly fitting gaskets. Make sure plugs and gaskets are tight. c. Take boat lifting harness from storage in cabin and attach to three lifting points on workboat; two eyes on bottom of stern mooring bitts and one eye under cabin floor. Open aft cabin top hatch to allow front lifting harness to reach crane hook without damaging cabin top. d. Place lifting harness ring in crane winch hook and use crane winch to take up slack in harness. e. Attach at least two control lines to boat to prevent swinging, twisting, and yawing when crane lifts boat from cradle. f. Check crane winch hook and harness alignment to make sure it will lift boat vertically. g. When ready, release tension on three tiedown straps (Figure 3-8) on each side of cradle and station crewmembers on control lines. Using crane winch, lift boat about 6 inches vertically from cradle. 3-10

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