UNDERWAY REPLENISHMENT NWP 4-01.4 - Historic Naval Ships ...

NWP 4-01.4(see Figure 6-5). When using one of the STREAM rigswith all-tensioned wires, the wire rope outhaul is fairledthrough a block at the top of the kingpost at the deliverystation, reeved through a fixture secured (after passing)at the receiving station (see SURF, paragraph 6.6.5),and attached to the outboard side of the trolley. Thewire rope inhaul is attached to the inboard side of thetrolley. The outhaul hauls the trolley to the receivingstation; the inhaul hauls it back to the delivery station.STREAM inhaul and outhaul winches can be operatedin two modes: speed control and tension control. TheNavy standard hauling winch incorporates the inhauland outhaul in one winch bed.6.6.2.1 Speed Control (Used during rigging andunrigging). Just like most cargo winches, inhaul andouthaul winches operated in speed control respond tothe movement of the control handle only. The furtherthe control handle is moved, the greater the speed of thewinch. (If installed, ensure that the ASD is ON and operatingbefore paying out winches in speed control.)When the winch operator moves the control handle inthe “pay out” direction, the winch runs out more wire.When he moves the handle in the “haul in” direction,the winch reels in wire. When the handle is in “neutral”(hands-off position), the internal brake sets and thewinch drum should not move.WARNINGNever move the sliding block while theinhaul winch is in speed control.6.6.2.2 Tension Control. In tension control, theinhaul and outhaul winches respond not only to the movementof the control handle but also to a tension-sensingmechanism in the winch. In tension control, the internalbrake is released at all times. When the winch operatorswitches the winch to tension control and his control handleis in “neutral,” the winch immediately hauls in, applyingand maintaining a minimum tension of about 1,000 lb(454 kg) to 1,500 lb (680 kg) in the wire rope.CAUTIONInhaul and outhaul winches when put intension control immediately haul in to put1,000 lb (456.5 kg) to 1,500 lb (680 kg) oftension on the wire ropes. The bitter ends ofthe inhaul and outhaul must always beproperly secured and personnel must beclear of the lines before switching winchesto tension control.The tension-sensing mechanism measures tension inthe wire rope, either directly from the wire rope, orthrough pressure changes in the hydraulic fluid.Moving the control handle in the “increase tension” directionincreases tension in the wire; moving the controlhandle all the way in the “increase tension”direction applies about 4,500 lb (2,041 kg) to 5,000 lb(2,268.5 kg) of tension in the wire.The difference in the amount of tension in the inhauland outhaul wires is what causes the trolley to move inthe direction of higher tension. The operation of theinhaul and outhaul is illustrated in Figure 6-5.6.6.2.3 Tension Control Compensates for ShipMotion. The major reason for tension control in theinhaul and outhaul winches is to prevent a tightline conditioncaused by ship movement during transfer. Thewinch attempts to maintain the tension “ordered” by theposition of the control handle — either minimum tensionor some increased tension in one of the wincheswhen moving the trolley — by responding to the tensionmeasured by the tension-sensing mechanism. Theinhaul and outhaul winches either pay out or haul inwire rope in an attempt to maintain the “ordered” tensionas the distance between ships changes.6.6.3 STREAM Transfer Station. A STREAMtransfer station includes as major equipment a kingpost, asliding block, and a STREAM transfer head. The slidingblock is driven by chains or hydraulic pistons up and downon a track inside the kingpost (see Figure 6-6). Inside thesliding block and transfer head are sheaves through whichthe highline and inhaul are reeved. Since the sliding blockcarries the transfer head, its movement controls the verticaltravel of the transfer head, highline, trolley, and suspendedload. The sliding block is lowered close to the deck for riggingSTREAM, raised to the top of the kingpost to lift aload from the deck and transfer it, and lowered far enoughto bring the empty cargo hook close to the deck for pickingup the next load. This feature provides good load control.6.6.4 Trolley. The STREAM trolley is used in allSTREAM rigging (see Figure 6-7).6.6.4.1 Trolley Support Arms. Where provided,trolley support arms serve as a support to the STREAMtrolley when it is placed against the transfer head. Theyprovide the transfer station with a means of control forthe trolley when the highline is in the detensioned mode.6.6.5 Standard Underway ReplenishmentFixture. On all-tensioned wire rigs, the SURF is usedto fairlead the tensioned outhaul at the receiving station.It is furnished by the delivery station and hauled by6-11 ORIGINAL