Coast Guard Deck Operations

Question 1

How does spontaneous combustion occur on boat?

Answer 1

Think oil soaked rag, hot, begins to oxidize, boom! -store in closed/sealed metal container

Question 2

Fire Tetrahedron?

Answer 2

Question 3

3 ways fire spreads

Answer 3

1) Radiation (heat rays no need to touch directly can lead to combustion)
2) Conduction: direct contact
3) Convection: parts of the burned mass is vaporized, can move and heat up other spots

Question 4

Class A and solutions

Class B and solutions

Answer 4

Class A: Common combustible shit (wood, cloth)-quenching/cooling (water)-removes heat

Class B: Flammable gas/liquids-smothering-removes O2

Question 5

Class C

Class D

Answer 5

Class C: electrical-CO2/dry chemical-remove O2 and a bit of heat

Class D: Combustibe metals (Na, Mg, K)-water and sand-remove heat

Question 6

3 ways to apply water

Answer 6

1) straight (solid stream)-A/D (NO for B since atomize liquid or C since conductor electricity)
2) high velocity fog-great for A and B (smothers and since fine particles won’t get violent reaction in B), C (since atomized not conductor…just stay 4 feet away) and D (may explode though)!
3) low velocity fog-larger surface area use when can get close

Question 7

When to use Acqueous Film Foam

Size Fire Exting (smallest?)

Answer 7

Class B

(it conducts electricity so no for C)

I-V (I smallest)

Question 8

How does CO2 work?

Answer 8

smothers (it’s heavier than air)

doesnt remove o2 so can get it back!

-5 feet distance optimal

Question 9

Potassium Bicarb use

Answer 9

Class B: heat shield, not cooling

Question 10

VHF/FM vs MF/HF

how long to hail again?

Answer 10

VHF/FM: line of sight, less static

MF/HF: long (200 miles, travel earth), static

-2 minutes

Question 11

What is in all liferafts?

Answer 11

1) instruction manual/card
2) ladder
3) jacknife
4) buoyant line min 100 ft/another painter
5) int/ext light
6) 2 paddles
7) pump
8) handles to right ship (underside)
9) 2 sea anchors

Question 12

Requirements Flares?

Answer 12

Question 13

Emergency Sound Signals

1) abandon ship!
2) Fire! Emergency!

3) Emergency is over

Answer 13

Question 14

3 types MSD (marine sanitation devices)

Answer 14

Type I: converts shit to ok stuff

Type II: converts but bigger (only big ships)

Type III: storage (vast majority) no magic

Question 15

Cold Front vs Warm Front

Answer 15

Think of one replacing the other

Cold Front worse…cold air replacing warm…forces warm air up, get crazy clouds, BAM (dropping baro pressure)

Question 16

Rotation Cyclone? (area of low baro pressure)

Rotation Anticyclone (high pressure)

Thunder and lightning distance?

Answer 16

low pressure: counterclockwise and inwards around low pressure in Northern Hemisphere (opposite south)

high pressure Anti: clockwise (and towards the high) in North

See Lightning, Hear Thunder, divide by 5—miles from you

Question 17

2 types fog, which worse

Answer 17

1) Advection: Horizontal movement (warm air moving over cold land, get condensation…unaffected by sun, can happen day or night) BAD
2) Radiation: night/early morning: land cools quicker, allows some air near land to hit dew point and condense, sun burns it off

Question 18

2 most common line fabrics

Answer 18

Nylon (stretchy but sinks)

Polyethylene/glycol: 50% strength nylon but floats and lighter

Question 19

Knot or splice weakest point of line. by how much?

why bitter end?

the line attached?

Answer 19

Square (46%)>bowline (37%)>short splice (15%)>eye splice (5-10%)

working end/running end (used to go around the bitt)

standing end

Question 20

overhand vs underhand loop

How to determine mech advantage?

Answer 20

overhand= bitter end over standing end

underhand: bitter end under standing end

Count the number of number of fall (rope) near moveable block