Auxiliary Equipment Flashcards
A standard grade of 3 inch steel pipe has an outside diameter of 3.5 inches and an inside diameter of 3.068 inches. What is the nominal size of steel pipe having an outside diameter of 4.0 inches and an inside diameter of 3.548 inches?
3.5 inches
A ballast pump, with a capacity of 200 gpm, takes suction on a tank containing 300 long tons of sea water ballast. How much ballast will remain in the tank after pumping for one hour?
254.17 long tons
The distillate pump for a 10000 GPD evaporator, should be rated at a minimum of __________ .
6.9 gpm
The capacity of a particular ballast pump is 200 gallons per minute. Approximately how long will it take to ballast a tank with 68.5 long tons of seawater?
1.5 hours
A centrifugal ballast pump has a capacity of 200 gpm. If suction is taken on a ballast tank containing 200 long tons of seawater, how much water will be remain in the tank after discharging for one hour?
154.16 long tons
The best gasket material to use in cargo fuel oil lines is __________.
oil-resistant sheet packing
Which pipe listed has the largest outside diameter?
A A 3/4” pipe with a standard wall thickness.
B A 3/4” pipe with an extra strong wall thickness.
C A 3/4” pipe with a double extra strong wall thickness.
D All have the same outside diameter.
D All have the same outside diameter.
Which of the listed pipe sizes is not commonly used? A 3/8 inch B 1/2 inch C 5/8 inch D 3/4 inch
C 5/8 inch
Small leaks in gaskets of a flanged pipe joint should be stopped immediately after installation for what reason?
The leak may cause progressive damage to the flange mating surfaces over time.
When comparing globe valves to gate valves, globe valves:
require less force to open against large differential pressures.
Which of the valves listed will be cycled from fully open to fully closed when the handle is turned 90°? A A rising stem gate valve B A globe stop valve C A check valve D A butterfly valve
D A butterfly valve
Which of the following conditions can develop if a valve with a badly scored valve stem is repacked?
A The valve disk will crack.
B Leaking and premature failure of the packing.
C The valve disk will become eroded.
D The valve seat will sustain damage due to fretting.
B Leaking and premature failure of the packing.
Which of the listed materials have been used to manufacture piping available in standard weight, extra strong, and double extra strong wall thickness? A Plastic B Copper C Steel D All of the above
C Steel
Piping cross-sections ranging from 1/8 inch to 12 inches in diameter, are sized by __________ .
nominal inside diameter
A swing check valve is used in a pipeline to __________ .
allow flow in one direction only
To “verify” the position of a fully opened manual valve in an operating system, the operator should operate the valve hand-wheel:
in the closed direction, then open the valve to its previously open position.
A manual process used to remove small irregularities by grinding the contact surfaces together of a valve, is called __________.
lapping-in
Piping cross-sections over 12 inches in diameter are sized by the __________.
outside diameter
The designation ‘schedule 80 extra strong’ refers to __________.
piping wall thickness
Allowances may be made for the expansion and contraction in piping by the use of expansion joints or __________.
bends or loops in the line
To connect two lengths of pipe previously set in place, you should use a pipe __________ .
union
To properly remove packing from a valve stuffing box, you should use a __________ .
packing puller
Pipe thread taps are __________ .
tapered
Enlarging one tube end so the end of another tube of the same size will fit inside is termed __________.
swaging
A non-rising stem gate valve should __________ .
be opened to the end of the last opening turn, then rotate? the handwheel in the closing direction by approximately 1/4 of a turn
The tool used to prepare copper tubing for the installation of fittings is called a __________.
flaring tool
The movement of steam piping, as a result of changes in temperature, is compensated for by the use of __________ .
expansion joints
A gate valve installed in a piping system should be used __________.
in either fully closed or fully opened positions
On vessels using reach rods to manually control the tank valves, one turn of the hand wheel on deck will produce how many turns of the valve stem at the valve?
One turn
Copper coil tubing is best cut with a __________.
Tubing cutter
“Prussian Blue” is commonly used __________ .
when inspecting valve seat contact
After cutting a piece of tubing to be flared, you should __________.
remove inside burrs with a reamer
Fittings used to close the ends of pipe are called ‘pipe _____________’.
caps
The valve which is most suited for regulating the flow through a pipeline is a __________ .
globe valve
A ‘close nipple’ is a piece of pipe that is __________ .
threaded along the entire length
On tankers using manually operated tank valves, the deck hand wheel indicator registers the __________ .
approximate number of turns the tank valve has been opened
A pipe coupling is a fitting having __________.
inside threads on both ends
Excessive leakage and premature failure of valve packing is a result of __________ .
a scored valve stem
Before disconnecting a joint in a pipeline, you should __________.
be sure no pressure exists in the line
A thread die will be easier to start if the end of the shaft to be threaded is slightly __________.
chamfered
An eroded globe valve disk can be repaired by __________ .
taking a light cut in a lathe
Taps and dies used for threading pipe are __________.
tapered
Which of the listed metals offers the best resistance to sea water corrosion? A nickel B steel C aluminum D zinc
A nickel
Before making up a flanged joint, you should __________.
be certain that the flanges line up squarely
A stop-check valve is a type of check valve that __________ .
can only control the amount of flow in one direction
Which CFR provides information that pertains to sea valve inspections during a vessel dry-docking?
46 CFR Part 61
Accidental flooding of the engine room bilges through the bilge system is prevented by __________.
stop-check valves installed in the bilge suction manifolds
Which of the problems listed could happen if you attempted to force open a valve ‘frozen’ in position by using a wrench on the hand wheel?
A Over compression of the packing
B Bending of the valve stem
C Rapid corrosion of the valve disc
D Cracking of gaskets upstream of the valve
B Bending of the valve stem
Pipe threads are cut with a taper to __________ .
provide a leak-proof fit
According to 46 CFR Part 56, carbon steel bolts rather than alloy steel bolts may be used to make up a flange if the normal operating __________ .
pressure does not exceed 300 psi
Valves used in the machinery space piping systems, and constructed with threaded valve stems, must be __________.
right-hand closing (clockwise)
A thread chaser is a hand tool that should only be used for __________.
restoring damaged threads
Which of the following descriptions should be included when identifying the length for pipe nipples?
A Standard, extra-strong, double extra-strong, and schedule 80
B Close, short, long, and tank
C Cast, wrought, stainless, and brass
D Fully threaded, half threaded, long, and short
B Close, short, long, and tank
Coast Guard Regulations (46 CFR Part 56) require all power- operated valves, other than those opened against spring force, to have an energy storage system. That energy storage system shall be capable of __________ .
cycling all connected valves from the initial valve position to the opposite position and return
As routine maintenance, the bilge manifold valves are periodically removed and examined. Prior to resecuring the valve bonnets, the valve __________.
A bonnet flange gaskets should be renewed if they were cut or torn
B stem packing should be renewed if the packing has hardened
C disks and seats should be checked and lapped if necessary
D all of the above
D all of the above
The emergency bilge suction valve is typically used __________.
if the bilges become flooded and they cannot be emptied by any other means
The aft starboard bilge well is clogged, and back flushing has not been successful. The next practical solution would be to __________.
properly and safely empty the well with a portable pump then manually muck it out
Which of the valves listed should be used either in the fully opened or the fully closed position? A a gate valve B a globe valve C any check valve D any needle valve
A a gate valve
The purpose of annealing any metal is to make the metal __________.
softer
Steam supply piping to deck machinery is insulated in order to __________ .
reduce heat loss from the system
Joints in pipelines must be properly aligned before they are connected because __________ .
excessive strain on the joints will result if they are misaligned
If used for regulating fluid flow through a piping system, which of the valves listed could be damaged? A Plug valve B Globe valve C Gate valve D Needle valve
C Gate valve
When cutting external threads on a steel pipe with a die, you should __________.
continue turning until the end of the pipe has gone through the die and is flush with the die face
An inverted gate valve (stem pointing downward) may be subject to wear sooner than a similar valve installed in the upright position because __________ .
sediment collects in the bonnet
Gate valves should not be used for throttling as __________.
cutting of the disc will result
Compared to globe and angle valves, gate valves __________.
operate with little or no pressure drop when fully opened
Which of the following statements concerning butterfly valves is correct?
A Special tools are required for lapping or grinding.
B It is impossible to throttle flow with a butterfly valve.
C To close the valve, it is only necessary to turn the handle a quarter of a turn.
D The butterfly valve should never be used in a freshwater system.
C To close the valve, it is only necessary to turn the handle a quarter of a turn.
When comparing globe valves to gate valves, globe valves:
require less force to open against large differential pressures.
If one of the bilge system manifold valves does not properly seat, the __________.
bilge system will lose vacuum and prevent the other bilges from being pumped out
Which of the valves listed below is best suited for throttling service?
Globe
If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?
A The wearing rings are excessively worn.
B The suction strainer is clogged.
C The discharge valve is clogged.
D The shaft is worn.
B The suction strainer is clogged.
Which of the following actions should be taken FIRST if a bilge well of a multiple suction bilge system is unable to be pumped out?
A Open the bilge pump for inspection.
B Remove each of the suction manifold valves.
C Remove only the suction manifold valve to the affected bilge well.
D Attempt to pump out another bilge well to determine if the entire system is affected.
D Attempt to pump out another bilge well to determine if the entire system is affected.
An emergency bilge suction is required for __________ .
machinery space bilges
Which of the following is the minimum internal diameter of the main bilge suction piping permitted by Coast Guard Regulations (46 CFR Part 56) on a vessel over 150 gross tons? A 1 1/2 inches. B 2 1/2 inches. C 3 1/2 inches. D 4 1/2 inches.
B 2 1/2 inches.
A pneumatic pressure tank is installed in a sanitary system to __________.
reduce excessive cycling of the sanitary pump
Traps in plumbing drains are designed to help prevent __________.
escape of odors into the living quarters
The flame screens installed on tank vents that may contain combustible gases, are designed to prevent explosions by which of the following?
A absorbing any flammable vapors in the vicinity
B allowing the escape of flammable vapors
C preventing flammable vapors from entering the tank
D dissipating the heat of an external flame
D dissipating the heat of an external flame
The process of grinding, shredding, or reducing the size of sewage particles is known as __________.
maceration
A vessel is in compliance with federal regulations regarding the discharge of sewage by __________.
A pumping the sewage ashore to an approved container
B holding all sewage onboard
C treating sewage in an approved system
D all of the above
D all of the above
Sewage treatment systems aboard U.S. inspected vessels must be approved by the __________ .
U.S. Coast Guard
Which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush water at ambient air pressure and temperature?
Type III
Short cycling of the potable water system’s pump is prevented by using __________ .
a hydro-pneumatic pressure tank
A recirculating line is provided in the potable hot water system to __________ .
maintain the desired temperature range throughout the system
Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water? A Hydrochloric acid B Chlorine C Sulfuric acid D Zinc chromate
B Chlorine
When shifting suction from one fresh water tank to another, if the fresh water pump loses suction you should__________ .
vent the pump casing
Distilled water from an evaporator is normally discharged into a potable water tank __________ .
after passing through a solenoid operated dump valve energized by an alarm monitor
A salinity indicator is used to determine the __________.
location of salt water contamination
Zinc anodes are installed in a marine sea water heat exchanger cooling system to __________ .
control electrolysis
