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165 Cards in this Set
- Front
- Back
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The specification for simultaneous fueling, loading/downloading of weapons is found in what manual?
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CV and Aircraft Refueling NATOPS manuals.
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Who should leaks in aircraft, hose and connections, or trouble with fueling equipment be reported to immediately?
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The aviation fuels flight deck supervisor.
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How much does a gallon of JP-5 weigh?
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A gallon of JP-5 weighs 6.8 pounds.
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When will the squadron get a bill for the number of gallons of fuel received?
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At the end of a preset time
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When the fuel checker records the amount of fuel in the aircraft before and after fueling, how are the figures logged on the checker cards?
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They are logged in pounds.
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Who maintains the catapult cylinder lubricating system and the MOGAS system on board aircraft carriers?
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The Aviation Fuels Division (V-4).
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With the decline in use of piston engine aircraft, where are the lube oil systems now used?
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Solely to supply lubricating oil to the ship' S ,catapults.
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Who provides the oil used in jet engines?
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It is provided in sealed cans and handled through the Supply Department.
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What is the lube oil system?
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A separate, independent system composed of a storage tank, one or two pumps, valves and piping.
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From where do the lube oil systems pumps take suction?
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From the manifolds connected to the lube oil storage tank and discharge through a manifold to the riser going
to the service tanks. |
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The aviation lube oil system is operated according to what publication?
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ALOSS.
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Why is a 4JG sound-powered phone instaled in the lube oil spaces?
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For constant communications between the pump room operator and catapult personnel during actual pumping
operations to the service tanks. |
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How are the aviation lube oil systems storage tanks filled?
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By pouring from drums, siphoning from drums, or loading from a truck on the dock.
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Why should caution be taken when loading from a truck on the dock?
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To ensure that the pressure from the truck to the lube oil system is not enough to cause damage to hose, piping or pumps.
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Why is a vent not necessary when taking on lube oil?
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The system is vented through the tank to the overflow tank by valves that are locked open.
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The lube tanks are not filled beyond what capacity?
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90 percent.
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What is the DeLava131P156 pump?
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A vertical, single-stage, positive displacement, rotary-screw pump.
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What are the main parts of the DeLaval pump?
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It consists of a power rotor, two idler rotors, the housing, thrust elements, shaft packing, and piping
connections. |
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What device in the pump moves the oil?
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Power rotor.
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What procedure must be followed before starting the pump?
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Carefully clean all external surfaces and then prime the pump by filling the pump case and as much of the
suction line as possible with oil. I" |
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What is done if no priming connection is provided?
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Use the plug on the suction connection is of the pump.
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Once the pump is moving oil satisfactorily, how long should the shaft packing be allowed to leak freely?
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The first 15 minutes; then tighten the gland nuts with your finger until there is only a slight leakage past the
packing. |
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What should be done if the pump fails to discharge after starting?
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Stop the pump, prime again, and restart the pump. If it doesn't pick up oil immediately, start checking for
the trouble. |
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What can be connected at several points along the suction line, while the pump is operating, could help locate the trouble?
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A gage.
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Why should checks for trouble be made quickly and systematically?
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Operating the pump without oil causes rapid wear of the housing and bearings.
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When the lube oil pump is in operation, at what intervals should the suction and discharge pressures be checked?
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Every 10 minutes.
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How often should the shaft packing be inspected to see that it is properly adjusted?
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Once each day.
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What is the purpose of the relief valve on the DeLaval pump?
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To prevent excessive oil pressure build up.
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How are the four flexible, metallic packing rings installed, that are located in the packing box end cover?
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With the joints of abutting rings staggered, and are held in place by a packing gland.
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Why is this packing gland split?
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To allow paking replacement without disturbing the other elements on the pump
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An inspection made while the pump is operating discloses a leakage between the end covers and case or in the piping connections, what could be the cause?
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It may be due to foreign matter on the gaskets, defective gaskets, or loose nuts and bolts.
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What does a low discharge pressure generally indicate?
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That not enough oil is being pumped.
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What is generally the cause of a gradual decrease in discharge pressure over a period of time?
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Pumping oil that contains abrasive particles, which causes the housing and rotors to wear.
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What may be the cause of excessive or unusual noises?
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Cold oil, dirty strainers, air in the oil, vaporization of the oil because of increased temperature, or
misalignment of the coupling. |
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What can excessive friction in the pump or in the driving unit cause?
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It can cause the driving unit to be overloaded.
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The MOGAS is operated according to what publication?
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CFOSS
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What is hydraulics?
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The study of the behavior of fluids in their application to engineering problems.
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Who discovered the fundamental law underlying the whole science of hydraulics?
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The French scientist, Pascal, in the seventeenth century.
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What does Pascal's law state?
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Any pressure or force applied to a confined liquid will be transmitted equally and undiminished in all
directions, regardless of the size or shape of the container. |
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What liquids are handled in the MOGAS system?
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Seawater and gasoline.
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What is the weight of a cubic foot of seawater?
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64 pounds.
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What is the weight of a cubic foot of gasoline?
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45.8 pounds.
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The MOGAS system on the ship is like a giant U-tube, what forms the bottom of the tube?
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The saddle storage tank containing seawater and gasoline.
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What forms the sides of the tube?
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The seawater piping forms one side, and the gasoline piping forms the other.
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What is the purpose of the design of MOGAS tanks?
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To keep the gasoline storage tanks entirely full at all times.
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A MOGAS storage tank is actually a combination of how many tanks?
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Two tanks - an outer tank and a draw-off tank - and a cofferdam.
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What is the cofferdam normally filled with to protect against fire or explosion?
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Nitrogen (N2) or Carbon Dioxide (CO2).
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What is installed between the tank and manhole cover plate?
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A Buna-N-Cork to prevent leakage.
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Where does a pressure gage line extend from the outer tank?
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From the top of the outer tank to a pressure gage located in the pump room.
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How is the outer tank interconnected with the draw-off tank?
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By a sluice pipe which extends from near the top of the outer tank and terminates in a diffuser at the bottom
of the draw-off tank. |
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Why is the top of the sluice pipe flared?
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To reduce friction.
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What is the draw-off tank?
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Smaller than the outer tank, it is the tank from which gasoline is drawn when servicing or off-loading fuel.
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Why is the draw-off tank provided with an independent stripping system?
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To remove water and sludge from the bottom of the tank.
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The suction line is fitted with a shut-off valve and extends at what height off the bottom of the tank?
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Three- fourths of an inch off the bottom at the lowest part of the tank.
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Where does the discharge line terminate?
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24 inches off the bottom of the outer tank, and overboard.
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What is a drain tank?
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A small tank located inside the outer storage tank.
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What does the drain tank store?
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Contaminated MOGAS/water that is filter/separated out of the MOGAS.
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When the cofferdam is charged with CO2, what percentage of inertness must be maintained?
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At 35% to reduce fire and explosion hazards.
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What is cofferdam normally kept charged with?
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Nitrogen to 3psi at 50% inertness.
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What is the purpose of the nitrogen supply line?
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For purging and charging the cofferdam, the line terminates in a loop, which completely encircles the outer tank.
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Where does an air escape riser, fitted with a shut-off valve, extend?
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From the top of the cofferdam and vents to atmosphere at the 02 level.
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What does the bypass line, installed around the shut-off valve, contain?
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A sure-relief valve (set at 4psi), a pressure gage, and a portable inertness analyzer connection.
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Why is a fixed eductor installed in the cofferdam?
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To remove any seawater or gasoline that might escape fi'om the storage tanks.
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Where are the controls for the eductor located?
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In a watertight box on the pump room deck.
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What is the purpose of two static-head liquid-level gages installed in each cofferdam?
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Electric sensors to indicate the presence of leakage into the compartment.
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When does the storage tank diffuser reduce turbulence?
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When gasoline or seawater enters the storage tanks.
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Where are the diffusions mounted on the gasoline storage tanks?
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On the bottom around the end of each sluice pipe and seawater supply riser.
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How is the diffuser designed?
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A perforated cylinder with an open bottom, and has a top plate with an opening for the gasoline or seawater
supply pipe. |
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What happens as gasoline or water enters the diffuser in a single stream?
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The single stream is broken into smaller streams as it passes through the holes in the cylinder. This helps to
reduce turbulence. |
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What types of gages are currently used in the gasoline tanks to determine the amount of gasoline within
the tanks? |
The water filled, static-head type and the TLI.
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What does the water-filled static-head gasoline gage provide?
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An accurate means of determining the amount of gasoline in the saddle-type storage tanks.
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What items are necessary for the actual gaging of the tanks?
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The differential pressure gage, water-filled connecting lines, and the upper and lower in-tank reservoirs
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What happens when the storage taoks are full (100%) ofseawater?
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A constant differential presure exists between the upper and lower in-tank reservoirs, and the different pressure gage reads zero
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What happens as the storage tank is filled with gasoline?
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A varying differential pressure is developed between the upper and lower in-tank reservoirs.
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How is the varying differential pressure, created by the difference in specific gravities of the two liqui nsmitted to the gage panel?
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Through the water-filled connecting lines.
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What are the basic units of the differential pressure gage?
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The bellows, torque tube, and dial mechanism.
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What is a flow indicator?
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Provides visual identification of the flow of seawater through a pipeline.
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What are the in-tank reservoir connecting lines?
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Gasoline tight, cylindrical tanks with a nontight flanged cover.
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Why are the connecting lines purged with seawater?
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To prevent gasoline from entering the pump room through the lines.
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What is the Bow-limiter valve?
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A globe-type needle valve used to reduce seawater pressure to the desired pressure
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What does the seawater pressure gage indicate?
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The pressure of the seawater supply, and is located between the flow-limiter valve and the purge valve.
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What is the Boat for the TLI used in MOGAS systems constructed of!
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Hycel, a material designed to float on water and sink in fuel.
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What is the purpose of the seawater system?
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Supplies seawater to the outer tank to force gasoline up to the transfer pump. It provides a means for flush
and draining the storage tank, and limits the amount of pressure that can be applied to the tanks at maximum pump capacity. |
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How is seawater supplied directly from the sea?
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Through a sea chest located in the cofferdam around the storage tanks. A steel grating is installed in
opening of the ship's bottom to prevent large objects from being drawn into the system. |
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What is used for cleaning out the sea chest in the event of clogging?
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Steam and it is also used to remove remaining gasoline vapors.
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Where is the motor-driven, centrifugal seawater pump located?
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In the MOGAS pump room, and the motor is in the adjacent pump motor room.
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What is the pump suction line fitted with?
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A basket strainer, a one-way check valve, and a compond gage.
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Where is the discharge header connected?
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To the outer tank seawater supply riser and the seawater expansion tank fill line.
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What is the purpose of the 500-gallon expansion tank?
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It is kept full of seawater and its purpose is to keep the MOGAS tanks full at all times by compensating
contraction of the MOGAS. |
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What is installed around the overflow line at the shell connection to keep the line clear during ic ditions?
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Steam-heating coils.
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What device is designed to break the syphoning effect of the overflow loop in the overboard discharge line
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The vent line.
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What pressure is required at the gasoline pump suction to prevent tbe gasoline pumps from becom lor locked?
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About 0.5 to Ipsi.
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How is a positive pressure maintained on the gasoline pump suction?
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As gasoline is drawn from the tank, it is automatically replaced with seawater.
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When MOGAS passes through spaces, how is it carried?
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In double-walled piping that consists of two concentric pipes.
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What is the purpose of the inner pipe?
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It is made of copper nickel and carries the fuel.
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What is the purpose of the outer pipe?
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It is made of steel and serves as an armor casing. It also serves to contain a protective jacket of inert nitrogen
gas at 3psi around the inner piping. |
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What is the range of the pressure gage that is installed in the pump room to indicate the pressure in the double-walled piping?
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0 to 15psi.
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What will be the indication that the outer casing is pierced?
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The nitrogen gas will leak out and the resUlt will be a drop in pressure.
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If a rupture should occur in the fuelUne inside the steel casing, what will be indicated on the gage?
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There will be an increase in pressure.
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Why are expansion bellows provided in the outer casing of the MOGAS double-walled piping?
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To avoid strains in the casing due to unequal expansion, which may result in leakage of the nitrogen.
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What serves to hold the inner piping in the center of the outer piping and still allows for movement caused by expansion and contraction between the two pipes?
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Brass liners soldered to the outside of the inner piping and steel spacers welded to the inside of the outer are
placed at intervals of about 5 feet. |
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Where is an inert gas connection, for charging the outer piping, provided?
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At the lower or inboard end of the double-walled piping.
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Why is the outer piping provided with a relief valve?
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To avoid excess pressure and the relief valve is set at 15psi.
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What system is provided in all MOGAS distribution risers?
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An automatic pressure-regulating system.
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Where is the pressure regulator typically installed on LHAs?
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After the filter.
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How does the automatic pressure-regulating valve, located in the pressure regulator, operate?
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Through changes of pressure in the throat of the venturi, located downstream of the valve.
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If a fluid flowing through a tube reaches a constriction or narrowing of the tube, what happens to the speed of the fluid?
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The fluid flowing through the constriction increases and its pressure decreases.
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What happens if the fluid flows beyond the constriction into a tube the same size as that of the original?
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The speed of flow decreases and the pressure increases.
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How can the pressure regulating system be installed either horizontally or vertically in the riser?
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It is entirely hydraulic in operation, using line pressure to open and close the valve.
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How is the main valve in the automatic pressure-regulating system designed?
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It is of a modified globe design, employing a well-supported and reinforced diaphragm.
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What is the automatic pressure-regulating system pilot valve? .
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It is a direct-acting, spring-load~ valve designed with a large diaphragm and effective working area to ensure
sensitive control and accurate regulation of the required delivery presure |
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Where is the automatic pressure regulating system pilot valve located?
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It is located in the actuating line between the ejector strainer and the venturi throat.
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Where is the ejector strainer assembly installed?
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In the actuating line between the main valve and the pilot valve. It consists of an ejector nozzle with a 1/16
inch orifice protected by a 60-mesh monel strainer to prevent clogging of the nozzle. |
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How does the ejector strainer assembly, in the automatic pressure-regulating system, speed up the operation of the main valve?
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By speeding up the evacuation of fluid trom the cover chamber.
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What device prevents chatter of the main valve in the automatic pressure regulating system?
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The ejector strainer assembly
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How does the ejector strainer assembly in the automatic pressure regulating system prevent chatter of the main valve?
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By reducing the violence with which pump discharge pressure is admitted to the main valve cover chamber.
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Where is the control valve of the automatic pressure regulating system located?
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In the ejector bypass line, and is normally held closed by a compression spring.
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What is the function of the control valve in the automatic pressure regulating system?
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To close the main valve quickly when there is a sudden buildup in downstream pressure
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The re-circulating line on the delivery side of the venturi tube returns what percent of the capacity ba he booster pump?
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It delivers 5% back to the booster pump.
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What action restricts the flow through the ejector strainer assembly?
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The pressure under the pilot valve diaphragm reaches a point where it is greater than the setting of the pilot
valve spring, the pilot valve begins to close. |
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What action will cause a momentary decrease in venturi throat pressure
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An increase in the rate of flow.
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What action will increase the suction lift of the ejector?
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An increase in the ejector strainer assembly flow.
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How is the pilot valve pressure adjustment made?
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By turning the adjusting screw to vary spring compression on the diaphragm.
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How is the control valve adjustment made?
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By turning the adjusting screw clockwise to increase the pressure.
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What is the desired delivery pressure at the throat of the venturi?
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The desired delivery pressure is 22psi.
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At what intervals should the regulating valve completely be dismantled and thoroughly cleaned?
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It should be done at 6- month intervals
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When are all gages used in the pressure-regulating valve system removed, cleaned, and calibrated?
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It is done every 12 months.
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How are the MOGAS pumps on LPHs rated?
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They are centrifugal pumps with a rated capacity of 50 gpm at 90 psi and are typically called transfer pumps
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What is the function of the Sylphon packless globe valve?
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It is used to stop the hazardous leakage of gasoline past the packing in the ordinary valve by providing a ml
bellows (Sylphon), which prevents liquid ftom escaping through the valve stem opening. |
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Where are Sylphon packless globe valves used?
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In the pump room on the drainage piping ftom the centrifugal pumps, on other small diameter pipeli
carrying gasoline or nitrogen, and on steaming-out connections. |
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The double-walled piping, cofferdam, and gasoline tank, (when deballasted), are required to be made ill h what percentage of inertness?
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50 % inert gas concentration at 3psi
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The pressure relief valve for the double-walled piping is set at what pressure?
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It is set at 14psi.
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The pressure relief valve for the cofferdam is set at what pressure?
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It is set at 7psi
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What is required when using carbon dioxide in place of nitrogen?
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Purge to 35% inertness minimum
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What constitutes the inert gas regulating valve?
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A dome and body separated by a rubberized diaphragm.
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What is the function of the inert gas regulating valve?
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It actuates the poppet valve in the valve body by forcing down the valve stem.
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What happens when the regulating valve is being adjusted?
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Nitrogen gas ftom the high -pressure side of the valve is admitted to the dome chamber through an orifice
controlled by two needle valves. |
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What is the purpose of the portable inertness analyzer?
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It is an electrical instrument used to indicate the presence of inert gas and combustible vapors in
atmosphere in voids surrounding the gasoline storage tanks and double-wall piping when the service system is being purged. |
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What is a milliammeter, on the inertness analyzer, used to indicate?
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The analyzer current in milliamps.
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What does the galvanometer on the inertness analyzer indicate?
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The pressure of inert gas in percentage of inertness.
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What is used on the inertness analyzer to set the analyzer current to 150 milliamps?
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The current potentiometer.
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What is the purpose of the sensitivity potentiometer?
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It is used to calibrate the analyzer.
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Why is a sample dryer, which has only a bottom hose connection, filled with calcium chloride?
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The calcium chloride absorbs moisture from the sample.
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What is the vapor absorber filled with to absorb fuel vapors from the sample?
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It is filled with activated carbon.
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What is used to pump samples througl),the portable inertness analyzer?
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An aspirator bulb and hoses.
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What must be done to the analyzer to prepare it for use 'in an enclosure
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Turn the unit on, adjust the current to 150 milliamps, and allow 2 minutes for the analyzer to reach operating
temperature. |
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When should the batteries in the portable inertness analyzer be replaced?
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When the current adjustment rheostat does not bring the indicating needle to 15O milliamps.
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When should the calcium chloride and the activated carbon be replaced?
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Examine both after every 50 analysis. Replace the calcium chloride if it is glazed or hard. Reactivate or
replace the activated carbon. |
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How is carbon dioxide stored?
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In steel cylinders at pressures from 700 to 100Opsi; depending on variations oftemperature.
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What happens as gas is released through the opened cylinder valve?
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The pressure is gradually lowered until all the CO2 turns into gas.
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How much will the contents of CO2 in cylinders expand?
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It will expand 450 to 500 times in volume when it is released.
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What is carbon dioxide used for the protection of and fire-fighting in?
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The gasoline pump room, motor room, access trunk, and fuel filter rooms.
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Where are carbon dioxide cylinders located?
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In motor rooms and in compartments on the second deck directly above the filter rooms.
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Where are the pull boxes located?
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Inside the fifth deck access trunk, the fire pump room and on the starboard side of the hangar deck across
from the MOGAS pump room access. |
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What is done to operate the emergency pull box?
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Release the friction catch to allow the cover plate to drop, break the glass and pull out the handle until the red
portion of the pull cable can be seen. |
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How long after the carbon dioxide system is activated will the CO2 actually be discharged?
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It will be discharged after a I5-second delay.
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Where does the released carbon dioxide flow?
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Through the piping to the fuel spaces, where it is discharged through diffusing horns and spread as a
smothering blanket, eventually filling the compartment. |
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What does pressure from the carbon dioxide do to set off alarms?
|
It throws electric switches to actuate a carbon dioxide warning bell in the space, a visual alarm outside the
space at the access, and to stop the exhaust ventilation system, fun motors |
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When gasoline is taken aboard, what is'the maximum allowable capacity required on board when the ship is alongside a pier?
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The maximum allowable capacity is 80%.
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How is gasoline received aboard ship?
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Through the starboard main deck filling connections.
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What is normally the maximum allowable tank top pressure when filling MOGAS tanks?
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The maximum allowable tank top pressure is 23psi.
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What log must be maintained when gasoline is being received aboard?
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The re-fueling log.
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When the tanks are being filled with MOGAS, at what capacity should pumping be stopped?
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It should be stopped at 75% full.
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Why should the tank top valve be closed immediately when the liquid'ievel drops below the sight glass?
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To prevent N2 inert gas from entering the draw-off tank.
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After off-loading of gasoline, what is required to ensure proper flushing?
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flush with three complete changes of seawater.
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