52 



UNITED STATES COAST GUARD 



Why is a stop-check valve such as that 

 sketched required to be fitted on a pump 

 room bilge suction when the bilges are 

 pumped by the cargo pumps or cargo 

 stripping pump? 



If a case is marked as sketched, what 

 is the meaning of "A," "B," and "C"? 



What means are required to evacuate 

 the oil from a flooded pump room? 



When a vessel has a gas-free cer- 

 tificate reading "safe for men-safe for 

 hot work" : 



(a) What is the maximum vapor 

 content in the tank's atmosphere? 



(b) What residues may be present 

 in the tank? 



A vessel load? frozen ice cream which 

 comes aboard packed in dry ice. What 

 precautions would be necessary in stow- 

 ing and discharging such cargo? 



After the bales for port "A" had been 

 discharged at that port, how would you 

 protect the cartons for port "B" 

 damage from the rolling or 

 of the ship enroute to port 

 shoring material was not at 



against 

 pitching 

 "B", if 

 hand? 



Note: The separation between "A" and "B' 

 is thwartship. 



X)KOMAMA-*-B 



201/300 ► c 



What are the three necessary condi- 

 tions that must be maintained in a re- 

 frigerated compartment in order to 

 have good cargo turnout? 



What are the duties of the senior 

 deck officer during oil transfer opera- 

 tions? 



Why is it important that the ventila- 

 tion ducts in pump rooms extend below 

 any floor plates so that air is circulated 

 through the lowest part of the pump 

 room? 



A vessel is fitted with insulating mats 

 which enable her to make a refrigerated 

 space in the square of a 'tween deck 

 whose wings and ends are refrigerated. 

 In using such mats, would you consider 

 the tightness of the bottom mats or the 

 top mats of the space as being more im- 

 portant? 



What inspection is required prior to 

 making repairs involving riveting, weld- 

 ing, burning, etc., on a tank vessel? 



What provisions are made in the bilge 

 system of a vessel to protect the pipes 

 from becoming clogged or the pumps 

 being damaged? 



How can the possibility of clogging 

 the bilge suction be reduced when carry- 

 ing granular cargo such as grain, coal, 

 rock ballast, etc? 



In supervising the stowage of bagged 

 cargo in a hold : 



(a) When would you stack the 

 bags as in "A"? 



(b) When as in "B"? 



FO^ B Ma^^i^ 







^^ ^ ^m ^s iK ,x,^xi!- ^iw *\*» *»;* '> f- 



