NSTM 581 Anchoring Flashcards
When hauling in anchor chain from __ fathoms, do not exceed ____ speed
60 fathoms, half speed
Pay out the anchor chain to ___ fathoms and free-fall the anchor when anchoring in less than ___ fathoms
15 fathoms, 15 fathoms
Anchoring should not be done in depths > ___ fathoms
> 100 fathoms
Anchoring system is designed on a __kt wind and a __kt current in __fathoms of water, in firm sand with the current bow head on
70 kt wind, 4 kt current, in 40 fathoms of water
Chain size reflects a safety factor of __, all of which equal the chain tension at the ship’s ____
5, ships bolster
Distance between 2 targets points on the Short side of the nomograph is ___ inches
6 in
Distance between the 2 target points on the long side is __ inches
8 in
Diagonal distance between extreme target points is __ inches
10 in
Do not anchor on a slope greater than __ degrees
40 degrees
The bail lock pin on the chain stopper may be secured by ______________
figure eighting the lanyard on the pin / bringing the bail against the pin
In depths > 15 fathoms, pay out anchor using the windlass until __ fathoms from seabed and free-fall the anchor
15 fathoms
Operate the hydroelectric drive to bring the fluid up to operating temp ___*F, before hoisting anchor with capstan
140*F
Before using electromechanical windlass, ensure wildcat locking head is __________
disengaged
Most common cause of anchors NOT free-falling is fouling of the ___________
wildcat and capstan shaft bushings
Presence of bronze in lubricants indicates ________.
bushing wear
Lead line is marked to a depth of ___ fathoms, and a __or__lb lead weight.
25 fathoms, 7 or 14 lb lead weight
Overhaul all anchors, chain and appendages every __ yrs
12 yrs
Windlasses are designed to meet: hoist anchor chain from __ fathoms at __ fathoms pr min
60 fathoms, 6 fathoms pr min
Windlasses are designed to meet: hoist anchor and chain from ____ fathoms (at no specific speed)
100 fathoms
Wildcat handbrake shall stop and hold the anchor and chain with 15-30 out in not more than ____ fathoms; 45 out in not more than ___ fathoms; 60 out in not more than __ fathoms.
15-30 out, 2 fathoms
45 out, 3 fathoms
60 out, 4 fathoms
Electric motor for the electrohydraulic drive is usually a ____ speed, _____ current, _______type cage.
single speed, alternating current, squirrel type cage
Before cross connecting hydraulic power units, inspect all ______ for metallic particles
filters
The slower speed on the windlass electric drive is used to house the anchor in the hawse pipe and to hoist the anchor and chain from _____ fathoms
100 fathoms
Manually operated hydraulic pumps handle up to ____lb anchors and ____ inch chain
2,000 lb anchors and 1-3/8 inch chain
the electric brake is designed to hold ___% of the drive motor rated torque
150%
The speed ratio on the windlass gear box is selected to reduce motor speed to hoist the anchor from ___ fathoms at ____ fathoms pr min
60 fathoms, 6 fathoms per min
For anchor chains ____ and larger, hydraulic cylinders are used to assist in operating the hand brake
3-1/2 inch and larger
For new construction, wildcats fit anchor chain sizes in __ inch increments. Commercial ships that have been converted might fit ___ inch increment chain sizes.
New- 1/8 inch, Commercial- 1/16 inch
Inspect the windlass _______ (periodicity)
weekly
Verify the wildcat handbrake is set for releasing the _______ stoppers
chain stoppers
Do not allow more than ____fathoms of chain to run free without stopping.
15 fathoms
What is the max depth for a drop test?
65 fathoms
anchor holding power for a standard navy stockless is ____ times the anchor weight
7.1
A ___ degree fluke angle has higher holding power in mud. A ___ degree fluke angle has a higher holding power in firm sand.
50* - mud, 30* - firm sand
Anchors below ___ lbs are used as boat anchors.
150 lbs
Link length for anchor chain is ___ x’s the nominal diameter. Link width is ___ x’s the nominal diameter
Link length 6 x’s diameter , Link width 3.6 x’s diameter
Shot length is ___ fathoms
15 fathoms
Minimum bend radius for 3-1/2 inch chain is ____ inches.
24.5 inches
