Pumps Flashcards
___________ compressors are most widely used in the CG.
Reciprocating
Low: _________ Discharge pressure of 150 psi or less.
Ship’s Service Air (SSA)
Medium: ________ _______ Discharge pressure of 151 psi to 1000 psi.
Start Air (SA) or Diesel Start Air (DSA).
High: _____ ______ used in the Coast Guard. Discharge pressure of above 1000 psi.
Not commonly
Hydraulic _______: Used on some oil-pressurized compressors to protect the compressor in the event of a potentially damaging oil pressure drop.
unloaders
_________ drained compressor separators shall be drained once per watch, or every 4 hours, whichever comes first.
Manually
A stop valve can only be installed between the compressor and _________ if the compressor is fitted with a relief valve.
receiver
Centrifugal pumps are the most commonly found displacement type of pumps and are used to pump various fluids, where, ______ volume of flow at low pressure is required.
large
The centrifugal pump is a non-positive displacement-type pump and not _____ ______
Self priming
Centrifugal force is the force that tends to throw an object ______ from a center of rotation.
Outward
Volute: This type of casing uses a gradually widening _____ channel which changes velocity into pressure.
spiral
Diffuser: This type of casing serves the same purpose as the volute, but is ______ efficient. It directs more fluid to the outlet by the use of stationary vanes.
more
Shafts are usually made of a cold, _____ ______ or other hardened steel.
rolled steel
Mechanical seals should be replaced if the leakage rate exceeds 5 drops of fluid per minute (for newly installed seals) or _____ drops of fluid per minute for seals already in service.
60
When handling a mechanical seal, make sure you wear ______ ______
latex gloves.
There are numerous methods to removing a bearing outlined in Naval Ships Technical Manual, Chapter 244.
• Arbor press
• ________ _______
Bearing puller
The _______ should be perpendicular to the axis within .002 inches.
impeller
P6 has A _______, portable fuel tank (capacity 2.5 gallons, provides 4-6 hours of operation)
removable
P6 suction • A ______ long, 3-inch diameter suction hose with quick-disconnect fitting and screen.
15-foot long
Fill the P-6 fuel tank to a______ of 2 inches below the top.
maximum
P6 instructions are attached to the flashlight to the laminated instruction card with a ______ length of cord.
2-foot
Do not operate P-6 Pump without water for more than _________
2 minutes
The P-6 Pump fuel should be filled with ____ octane or higher
86
Fold the P-6 Pump’s 20-foot discharge hose into a tight, flat coil approximately 10 ______ _____. The coupling needs to hang free from the end of the flat coil approximately 8 inches.
inches long
_____ _____ of the P-6 Pump should be 1400 RPM and full throttle speed should be 3900 RPM.
Idle speed
P-6 spark plug gap is adjusted to ___ thousandths.
30
The P-100 _____ _____ ______ is a Bosch type timed at 13 plus or minus 1 degree top dead center.
fuel injection pump
The P-100 pump is a _____ ______, single-stage, centrifugal pump complete with a compound pressure gauge, drain valve, and primer connection.
single-suction
The P-100 pump has a 3-inch _____ _______ connection for the suction, and a 21⁄2-inch male- threaded connection for the discharge.
male-threaded
The P-100 comes with _____ rubber, 10 feet in length, 3-inch diameter NH threads sections of hose. Typically three hoses per pump assembly.
Hard
The P-100 has an _______ _______ jacketed 10 feet in length and 2 1⁄2 inches in diameter with clamped, flanged couplings.
Insulated synthetic
The two styles of _____ _____ used in the Coast Guard are the Elkhart and Akron. Both are available in 11⁄2-inch and 21⁄2-inch sizes.
vari-nozzles
There are two types of eductors used in the Coast Guard. They are the ______ type and the Peri-jet.
Navy “S”
Refueling a running P-100 pump in an ________ _______ only. A second person will stand by with a fire extinguisher during this evolution.
emergency situation
Check the engine and pump for freedom of movement and prime the engine with ________ ______ by slowly pulling on the recoil starter three times while pressing the decompression lever each time prior to starting the P-100 pump.
lubricating oil
The primer line shut-off valve should be _______ just prior to starting the P-100 pump.
opened
Once the P-100 pump has started, the ______ valve should be shifted to the prime position blocking the main exhaust opening.
exhaust
The P-100 pump be flushed with _____ _____ after shutdown a minimum of 10 minutes.
fresh water
Tighten the P-100 packing screw using a 6-inch long, 9/16-inch end wrench until drip rate is between ____ __ ____drops per minute – do not over-torque (24 in-lb torque).
5 and 60
The following ______ _____ are coupled with air compressors: Diesel engine, Gas engines and Electric Motors.
prime movers
Three types of _____ __________are centrifugal, rotary and reciprocating.
air-compressors
151 to 1000 psi is the ________ _______ pressure for start air or diesel start air.
normal operating
In ____ ______ compressors the compression cycle is completed in 1 revolution of the crankshaft.
two stage
Strip and Disc are the two most common types of _____ used in air compressors.
Valves
To reduce the risk of _______ the rapid operation of manual valves should be avoided.
explosion
The normal duration of a blow-down on an air-compressor is 10 to 20 _______.
seconds
The shutoff head is the_______ pressure that a pump can produce.
maximum
The two classifications of centrifugal pumps are _____ _____ and multi-stage.
single-stage
Touching the mated surfaces of a mechanical seal may cause _____ face failure.
Carbon
Line, radial, and ______ bearings give radial positioning to the rotor.
Shaft
An elastomer or “spider” helps _____ starts decrease.
Hard
A measurement _________ 0.002 inches would indicate excessive radial run-out.
exceeding
_____ alignment readings must be taken within 30 minutes of shutting down machinery.
Hot
