Tanks

Question 1

4 types of JP5 storage tanks

Answer 1

• Wing tanks
• deep- centerline tanks
• double bottom tanks
• peak tanks

Question 2

Wings tanks

Answer 2

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

Question 3

Deep-center line tanks

Answer 3

Originally for AVGAS but converted to JP5.

Question 4

Double bottom tanks

Answer 4

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

Question 5

Peak tanks

Answer 5

• 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.

Question 6

TLI’s used are marked with what

Answer 6

The tanks number

Question 7

Sounding caps are what kind of fitting

Answer 7

X-ray fittings and must be closed after each use

Question 8

Wing and deep center line tanks are used for ?

Answer 8

Service tanks

Question 9

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

Answer 9

A protective coating to minimize rust formations

Question 10

Air escape riser does what ?

Answer 10

Vents the tank to the atmosphere

Question 11

Air escape vent line extends where

Answer 11

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

Question 12

What is the purpose of the Air escape riser ?

Answer 12

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

Question 13

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

Answer 13

The open atmosphere

Question 14

The air escape screen is how many mesh?

Answer 14

60-mesh

Question 15

Overflow lines extends where ?

Answer 15

Top of the storage tank to the over flow tanks

Question 16

Overflow line is larger why?

Answer 16

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

Question 17

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

Answer 17

One - way check valve

Question 18

Bolted man hole cover on the tanks is for what?

Answer 18

Inspection, cleaning, maintenance

Question 19

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

Answer 19

2nd of 3rd deck

Question 20

The lower end of sounding pipe has what?

Answer 20

Striker plate

Question 21

And the upper end has what?

Answer 21

A mounted TLI

Question 22

Sounding tubes have evenly spaced holes for what?

Answer 22

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

Question 23

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

Answer 23

Retrieving sounding bobs or tapes that brake inside sounding tube

Question 24

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

Answer 24

6-24” inches

Question 25

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

Answer 25

A non vortex bell mouth fitting and a splash plate.

Question 26

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

Answer 26

- Reduces turbulence when filling - prevents a vortex when emptying tanks - prevents taking suction directly off the bottom

Question 27

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

Answer 27

It is smaller and has no splash plate

Question 28

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

Answer 28

1 1/2” off bottom of tank .

Question 29

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

Answer 29

24”

Question 30

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

Answer 30

The overflow line and the arrangement of vent line

Question 31

The overflow tank go where once overflowed?

Answer 31

Overboard .

Question 32

The overflow tank have a check valve to prevent what?

Answer 32

Prevent sea water from entering tanks

Question 33

What kind of valve in the overflow line

Answer 33

Spring tensioned wafer valve

Question 34

Contaminated tanks are designed for

Answer 34

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

Question 35

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

Answer 35

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

Question 36

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

Answer 36

- prefilter/reclaim

Question 37

What kind of valve on the overflow line?

Answer 37

Spring tensioned wafer valve

Question 38

When are contam and purifier sumo tanks cleaned ?

Answer 38

Every 18-21 months

Question 39

When are the storage tanks cleaned ?

Answer 39

Every 36-39 months

Question 40

When are the storage tanks cleaned ?

Answer 40

Every 60-63 months