Which step is NOT generally taken when gas-freeing a tank? ______.A.Washing the tank interior with sea waterB.Application of degreasing solventsC.Removal of corrosion products and sludgeD.Fresh air ventilation
Which step is NOT generally taken when gas-freeing a tank? ______.
A.Washing the tank interior with sea water
B.Application of degreasing solvents
C.Removal of corrosion products and sludge
D.Fresh air ventilation
相关考题：
A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the following conditions does this indicate?A.The tank is safe to enterB.The tank is especially dangerous to enterC.Carbon monoxide(一氧化物) is presentD.Water vapor present when the tank was sealed has oxidized(使氧化)
When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it ______.A.one meter from the tank bottom and one meter below the tank topB.one half the ullage of the tank and one meter below the tank topC.one half the ullage of the tank and one meter above the tank bottomD.at three meter intervals from the tank top to the bottom
When inspecting a tank barge to see that it has all the required fire extinguishers and other safety items aboard，which of the following is the best source for determining what is required?A.The supervisor in charge of the dock to which the barge is tied upB.Part 38 of the Rules and Regulations for Tank VesselsC.The Certificate of Inspection of the bargeD.The local fire marshal
You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE?A.Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleanedB.The hoses to portable cleaning machines should be disconnected before the machines are removed from the tankC.The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residueD.Steam cleaning and water washing are both capable of generating electrostatic charges within a tank
Which statement about the free surface effect is TRUE ________．A.It increases in direct proportion to the length of the tank times the breadth squaredB.It decreases at increased angles of heel due to pocketing when a tank is 90% fullC.It decreases in direct proportion to increasing specific gravity of the liquid in the tankD.In practice，the correction is considered to be a virtual reduction of KG
The fitting at the end of a cargo line in a tank that allows suction to be taken close to the bottom of a tank is a ______．A.Suction endB.StrainerC.Bell-mouthD.Vacuum valve
When referring to quantity of barite in a P-tank，ullage is the ______．A.Distance of the barite surface above the tank bottomB.Percentage of barite in the tankC.Distance of the barite surface below the tank coverD.Total weight of barite in UPC（ullages per centimeter）
You are planning to use a crude oil washing system．What precaution must be taken with the tank as the source for the washing machines ________．A.It must be debottomed and the level lowered by at least one meterB.The oil in the source tank must be sampled for compatibilityC.The source tank must have been crude oil washed at least once in the past 150 daysD.The inert gas system must lower the oxygen content to a maximum of 12% oxygen in the tank
Frames to which the tank top and bottom shell are fastened are called ______．A.floorsB.intercostalsC.stringersD.tank top supports
When cleaning a tank by the Butterworth process，you should begin to pump out the slops ______．A.At the end of the drop scheduleB.When the process is startedC.When the process is finishedD.When the tank is clean
Frames to which the tank top and bottom shell are fastened are called ______.A.intercostalsB.stringersC.tank top supportsD.floors
单选题The shut off valve at the gasoline tank which can be operated from outside the tank space （）.Acontrols the amount of gasoline to the engineBshuts off the gasoline supply at the tankCis used if the gasoline tank leaksDAll of the above
单选题When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.Aone meter from the tank bottom and one meter below the tank topBone half the ullage of the tank and one meter below the tank topCone half the ullage of the tank and one meter above the tank bottomDat three meter intervals from the tank top to the bottom
单选题Your vessel is taking on bunkers from a shore side facility, if oil begins flowing from one tank vent, which of the following actions should be taken FIRST?（）AOpen the intake valve to an adjacent tankBSet out drip pans and sawdust and begin to mop up the spillCSignal the shore control point to shutdownDClose the valve on the tank vent line
单选题A tank which carries liquid is dangerous to the stability of a vessel when it is（）.Alow in the vesselBcompletely emptyCcompletely fullDslack
单选题You are loading a cargo tank on your container ship. The tank displays the red label shown. Which statement is TRUE? （）AThe tank contains propyleneBThe tank's volume is 1077 cubic feetCThere are three tanks in the shipmentDThe tank contains an oxidizing material
单选题Fuel oil tank vents are fitted with a screen which will stop（）.Aoil from flowing out of the tank ventBair from entering the tank ventCvapors from leaving the tank ventDflames on deck from entering the tank vent
单选题What additional precautions should be taken when making temporary repairs to a ship that is operating when hydrogen sulfide is present?（）ASeal off all tank and compartment ventilationBRemove all bulk materials from the P-tanksCProvide respiratory protection and monitoringDAll of the above
单选题When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，the atmosphere must be sampled（）.Aone meter from the tank bottom and one meter below the tank topBone half the ullage of the tank and one meter below the tank topCone half the ullage of the tank and one meter above the tank bottomDat three meter intervals from the tank top
单选题Which of the actions listed should be taken FIRST to control an oil fire in a fuel oil tank?（）ACommence draining that tank as quickly as possibleBSeal off all vents to that tankCActivate the CO2 system to that tankDShut off the steam heating coils
单选题What action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?（）AThe tank must be gas freedBThe tank must be ballastedCThe tank must be vented to the atmosphereDThe bypass valve must also be closed
单选题Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?（）AThe tank must be gas freedBThe tank must be ballastedCThe tank must be vented to the atmosphereDThe bypass valve must also be closed
单选题Which step is NOT generally taken when gas-freeing a tank?（）.AWashing the tank interior with sea waterBApplication of degreasing solventsCRemoval of corrosion products and sludgeDFresh air ventilation
单选题A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?（）AThe tank is safe to enterBThe tank is especially dangerous to enterCCarbon monoxide is presentDWater vapor present when the tank was sealed has oxidized
单选题When inspecting a tank barge to see that it has all the required fire extinguishers and other safety items aboard，which of the following is the best source for determining what is required? （）AThe supervisor in charge of the dock to which the barge is tied upBPart 38 of the Rules and Regulations for Tank VesselsCThe Certificate of Inspection of the bargeDThe local fire marshal
单选题Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.Aonly when fully loadedBif one or more tanks are fullCwhen transferring cargoDonly when the barge is being towed
单选题A rectangular fish tank has a base 2 feet wide and 3 feet long. When the tank is partially filled with water, a solid cube with an edge length of 1 foot is placed in the tank. If no overflow of water from the tank is assumed, by how many inches will the level of the water in the tank rise when the cube becomes completely submerged?A1/6B1/2C2D3E4