Pumps

Question 1

___________ compressors are most widely used in the CG.

Answer 1

Reciprocating

Question 2

Low: _________ Discharge pressure of 150 psi or less.

Answer 2

Ship’s Service Air (SSA)

Question 3

Medium: ________ _______ Discharge pressure of 151 psi to 1000 psi.

Answer 3

Start Air (SA) or Diesel Start Air (DSA).

Question 4

High: _____ ______ used in the Coast Guard. Discharge pressure of above 1000 psi.

Answer 4

Not commonly

Question 5

Hydraulic _______: Used on some oil-pressurized compressors to protect the compressor in the event of a potentially damaging oil pressure drop.

Answer 5

unloaders

Question 6

_________ drained compressor separators shall be drained once per watch, or every 4 hours, whichever comes first.

Answer 6

Manually

Question 7

A stop valve can only be installed between the compressor and _________ if the compressor is fitted with a relief valve.

Answer 7

receiver

Question 8

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.

Answer 8

large

Question 9

The centrifugal pump is a non-positive displacement-type pump and not _____ ______

Answer 9

Self priming

Question 10

Centrifugal force is the force that tends to throw an object ______ from a center of rotation.

Answer 10

Outward

Question 11

Volute: This type of casing uses a gradually widening _____ channel which changes velocity into pressure.

Answer 11

spiral

Question 12

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.

Answer 12

more

Question 13

Shafts are usually made of a cold, _____ ______ or other hardened steel.

Answer 13

rolled steel

Question 14

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.

Answer 14

60

Question 15

When handling a mechanical seal, make sure you wear ______ ______

Answer 15

latex gloves.

Question 16

There are numerous methods to removing a bearing outlined in Naval Ships Technical Manual, Chapter 244.
• Arbor press
• ________ _______

Answer 16

Bearing puller

Question 17

The _______ should be perpendicular to the axis within .002 inches.

Answer 17

impeller

Question 18

P6 has A _______, portable fuel tank (capacity 2.5 gallons, provides 4-6 hours of operation)

Answer 18

removable

Question 19

P6 suction • A ______ long, 3-inch diameter suction hose with quick-disconnect fitting and screen.

Answer 19

15-foot long

Question 20

Fill the P-6 fuel tank to a______ of 2 inches below the top.

Answer 20

maximum

Question 21

P6 instructions are attached to the flashlight to the laminated instruction card with a ______ length of cord.

Answer 21

2-foot

Question 22

Do not operate P-6 Pump without water for more than _________

Answer 22

2 minutes

Question 23

The P-6 Pump fuel should be filled with ____ octane or higher

Answer 23

86

Question 24

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.

Answer 24

inches long

Question 25

_____ _____ of the P-6 Pump should be 1400 RPM and full throttle speed should be 3900 RPM.

Answer 25

Idle speed

Question 26

P-6 spark plug gap is adjusted to ___ thousandths.

Answer 26

30

Question 27

The P-100 _____ _____ ______ is a Bosch type timed at 13 plus or minus 1 degree top dead center.

Answer 27

fuel injection pump

Question 28

The P-100 pump is a _____ ______, single-stage, centrifugal pump complete with a compound pressure gauge, drain valve, and primer connection.

Answer 28

single-suction

Question 29

The P-100 pump has a 3-inch _____ _______ connection for the suction, and a 21⁄2-inch male- threaded connection for the discharge.

Answer 29

male-threaded

Question 30

The P-100 comes with _____ rubber, 10 feet in length, 3-inch diameter NH threads sections of hose. Typically three hoses per pump assembly.

Answer 30

Hard

Question 31

The P-100 has an _______ _______ jacketed 10 feet in length and 2 1⁄2 inches in diameter with clamped, flanged couplings.

Answer 31

Insulated synthetic

Question 32

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.

Answer 32

vari-nozzles

Question 33

There are two types of eductors used in the Coast Guard. They are the ______ type and the Peri-jet.

Answer 33

Navy “S”

Question 34

Refueling a running P-100 pump in an ________ _______ only. A second person will stand by with a fire extinguisher during this evolution.

Answer 34

emergency situation

Question 35

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.

Answer 35

lubricating oil

Question 36

The primer line shut-off valve should be _______ just prior to starting the P-100 pump.

Answer 36

opened

Question 37

Once the P-100 pump has started, the ______ valve should be shifted to the prime position blocking the main exhaust opening.

Answer 37

exhaust

Question 38

The P-100 pump be flushed with _____ _____ after shutdown a minimum of 10 minutes.

Answer 38

fresh water

Question 39

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).

Answer 39

5 and 60

Question 40

The following ______ _____ are coupled with air compressors: Diesel engine, Gas engines and Electric Motors.

Answer 40

prime movers

Question 41

Three types of _____ __________are centrifugal, rotary and reciprocating.

Answer 41

air-compressors

Question 42

151 to 1000 psi is the ________ _______ pressure for start air or diesel start air.

Answer 42

normal operating

Question 43

In ____ ______ compressors the compression cycle is completed in 1 revolution of the crankshaft.

Answer 43

two stage

Question 44

Strip and Disc are the two most common types of _____ used in air compressors.

Answer 44

Valves

Question 45

To reduce the risk of _______ the rapid operation of manual valves should be avoided.

Answer 45

explosion

Question 46

The normal duration of a blow-down on an air-compressor is 10 to 20 _______.

Answer 46

seconds

Question 47

The shutoff head is the_______ pressure that a pump can produce.

Answer 47

maximum

Question 48

The two classifications of centrifugal pumps are _____ _____ and multi-stage.

Answer 48

single-stage

Question 49

Touching the mated surfaces of a mechanical seal may cause _____ face failure.

Answer 49

Carbon

Question 50

Line, radial, and ______ bearings give radial positioning to the rotor.

Answer 50

Shaft

Question 51

An elastomer or “spider” helps _____ starts decrease.

Answer 51

Hard

Question 52

A measurement _________ 0.002 inches would indicate excessive radial run-out.

Answer 52

exceeding

Question 53

_____ alignment readings must be taken within 30 minutes of shutting down machinery.

Answer 53

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