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Pump Room > Tanks > Flashcards

Tanks Flashcards

1
Q

4 types of JP5 storage tanks

A
  • Wing tanks
  • deep- centerline tanks
  • double bottom tanks
  • peak tanks
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2
Q

Wings tanks

A

Deep tanks located in a FWD and AFT row along the hull on the port and STBD side of the ship.

  • normally 2 rows of wing tanks on each side of ship.
  • top of the tank is the 4th deck and bottom is shell of the ship.
  • each port tanks has an identical tank but on STBD side of ship.
  • the twin tanks are filled as one unit to preserve lost and trim of ship
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3
Q

Deep-center line tanks

A

Originally for AVGAS but converted to JP5.

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4
Q

Double bottom tanks

A

Has a bottom and an inner bottom .

  • top of double bottom is the deck of the bilge.
  • bottom of double bottom tank is the shell of the ship .
  • they are shallow tanks
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5
Q

Peak tanks

A
  • deep tanks that are located in the extreme bow and stern of the ship below the waterline
  • only the bow is used for JP5 presently.
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6
Q

TLI’s used are marked with what

A

The tanks number

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7
Q

Sounding caps are what kind of fitting

A

X-ray fittings and must be closed after each use

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8
Q

Wing and deep center line tanks are used for ?

A

Service tanks

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9
Q

Storage tanks and piping inside the tanks are sandblasted and coated with

A

A protective coating to minimize rust formations

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10
Q

Air escape riser does what ?

A

Vents the tank to the atmosphere

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11
Q

Air escape vent line extends where

A

Extends from the top of tank to an air escape main that runs FWD and AFT just below the main deck .

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12
Q

What is the purpose of the Air escape riser ?

A

Prevents a build up of pressure when tanks are being filled .
- prevents a vacuum from forming when tank is being emptied.

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13
Q

The air escape piping penetrates the skin of the ship and into where ?

A

The open atmosphere

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14
Q

The air escape screen is how many mesh?

A

60-mesh

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15
Q

Overflow lines extends where ?

A

Top of the storage tank to the over flow tanks

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16
Q

Overflow line is larger why?

A

To prevent rupture of storage tank in the event of overflowing at high pressure.

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17
Q

What is on the overflow line that prevents back flow into storage tank

A

One - way check valve

18
Q

Bolted man hole cover on the tanks is for what?

A

Inspection, cleaning, maintenance

19
Q

Sounding tubes extend from the extreme bottom of tank to where ?

A

2nd of 3rd deck

20
Q

The lower end of sounding pipe has what?

A

Striker plate

21
Q

And the upper end has what?

A

A mounted TLI

22
Q

Sounding tubes have evenly spaced holes for what?

A

To ensure that the level of the fuel in the tube is the same level in the tank

23
Q

The bottom of tube has also a takedown joint that is for?

A

Retrieving sounding bobs or tapes that brake inside sounding tube

24
Q

Suction and fill pipes extend from the manifold to how far off the the bottom of tank?

A

6-24” inches

25
Q

What is installed at the end of the suction and fill tailpipes?

A

A non vortex bell mouth fitting and a splash plate.

26
Q

What is the purpose of the non vortex bell mouth fitting ?

A
  • Reduces turbulence when filling
  • prevents a vortex when emptying tanks
  • prevents taking suction directly off the bottom
27
Q

The stripping tailpipe is similar in design as suction and fill tailpipe except ?

A

It is smaller and has no splash plate

28
Q

How far does the stripping tailpipe extend from the manifold to the bottom of tank?

A

1 1/2” off bottom of tank .

29
Q

When consolidating JP5 fuel, the stripping tailpipe removes the last how many inches of fuel?

A

24”

30
Q

Overflow tanks have the same design as the other storage tanks with the exception of ?

A

The overflow line and the arrangement of vent line

31
Q

The overflow tank go where once overflowed?

A

Overboard .

32
Q

The overflow tank have a check valve to prevent what?

A

Prevent sea water from entering tanks

33
Q

What kind of valve in the overflow line

A

Spring tensioned wafer valve

34
Q

Contaminated tanks are designed for

A

JP5 fuel from hose flushing , defuel, tank stripping operations, and the initial flow when fueling at sea

35
Q

Each defuel piping that go into contaminated tanks branch how far from bottom of tank?

A

About 48 inches from bottom with a 24” horizontal run to reduce turbulence

36
Q

Fuel in contaminated tanks will be filtered through? Then into stowage tanks

A
  • prefilter/reclaim
37
Q

What kind of valve on the overflow line?

A

Spring tensioned wafer valve

38
Q

When are contam and purifier sumo tanks cleaned ?

A

Every 18-21 months

39
Q

When are the storage tanks cleaned ?

A

Every 36-39 months

40
Q

When are the storage tanks cleaned ?

A

Every 60-63 months

Pump Room (8 decks)

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