72 



UNITED STATES COAST GUARD 



A vessel displacing 8,000 tons making 

 5 knots brings up on her anchor in one 

 hundred feet. The chain has a breaking 

 strength of 320,000 pounds. Will the 

 stress on the chain exceed the breaking 

 strength? 



Note: 



Use formula 



F = W^xVZ 



g 2S 



where "F" = stress in pounds 



' = displacement of the vessels in pounds 

 = acceleration due to gravity. 32.16 

 ' = speed in feet per second 

 = distance in which the vessel is stopped. 



"W 

 "G" 

 • •V 

 "S" 



Describe the effect of wind on a 

 vessel backing. 



Are there any rules which specify 

 the size of mooring lines which a vessel 

 must use? 



If a man falls overboard 300 feet for- 

 ward of the stern of a vessel making 15 

 knots: 



(a) How long would it take for 

 him to reach the stem (and the danger 

 of the propeller striking him)? 



(b) What orders would you give to 

 prevent the propeller striking him? 



Bringing up on her anchor chain at 3 

 knots, will a vessel exert a greater 

 stress on her chain in light or loaded 

 condition? Why? 



Describe a fire warp and how it is 

 used. 



On a vessel where it is necessary to 

 stow the chain in the locker, prescribe 

 the precautions necessary to avoid in- 

 jury to the men tiering the chain. 



What care should be taken to prevent 

 eye injury or other injuries to a man 

 while handling the brake of a windlass 

 in letting go the anchor? 



A vessel is moored stern to a quay, 

 bow anchored to two anchors with a 

 slight spread. Both anchor cables and 

 lines are taut. A strong wind comes up 

 athwart the mooring as illustrated. How 



may the leads of the lines and cables be 

 improved? 



How should a windlass be fitted to 

 prevent injury to personnel while en- 

 gaging or disengaging the wild cat, han- 

 dling lines, etc. ? 



The after holds of many vessels are 

 sounded from the shaft alley. Why are 

 these sounding pipes fitted with spring 

 loaded self-closing valves? 



When a vessel is fitted with a gang- 

 way that does not have self-adjusting 

 treads, how do you protect people from 

 injury to their legs by slipping through 

 the steps when the gangway is nearly 

 horizontal? 



What may be the result of permitting 

 a centrifugal or rotary pump to run dry 

 when pumping inflammable or combus- 

 tible oils? 



In washing the holds of a freight 

 vessel the strainers become plugged and 

 it is impossible to pump out the water 

 by means of the bilge pump. A portable 

 pump is rigged on deck, 35 feet above 

 the tank top of the hold and hose lead 

 both down the hold and over the side, 

 but the pump fails to pump the water 

 out of the hold. Under these circum- 

 stances, what would you do to pump out 

 the water ? 



On a deeply loaded vessel in heavy 

 weather taking green seas aboard, what 

 prevents water going into the tanks 

 through the gooseneck vents on deck? 



What inspection and maintenance 

 would you give gooseneck vents? 



What is the purpose of equalizing 

 valves fitted where tanks are divided 

 by a longitudinal bulkhead? How would 

 you maintain such valves and in what 

 position should they be kept? 



Describe the precautions which you 

 would regard as necessary for personnel 

 engaged in painting with spray guns. 



Describe the precautions necessary in 

 painting with red-lead or lead based 

 paints. 



