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

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

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

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<strong>NWP</strong> 4-<strong>01.4</strong>TYPE IVA, CLASS 2SCREW-PIN ANCHOR SHACKLESHACKLE SIZEIS DETERMINEDBY MEASURINGACROSS THISPOINTTYPE IVA, CLASS 3SAFETY ANCHOR SHACKLETYPE IVB, CLASS 2SCREW-PIN CHAIN SHACKLETYPE IVB, CLASS 3SAFETY CHAIN SHACKLEScrew-pin shackles are used in applications where it is or might be necessary to break down the shackle quickly.Safety anchor shackles are used in areas where there will be little chance that the rig must be taken apart quickly,such as stress wires, trolleys, and saddles. The safety shackle is also used for places where there is a possibility thata screw-pin type shackle might work loose. A screw-pin shackle may be used when a safety shackle is not availablebut then the screw-pin must be seized.Figure 2-6. Anchor and Chain Shackles2-16 ORIGINAL

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