General, Physical And Functional Description Of General Liquid Oxygen/Nitrogen Storage Tanks

Question 1

Storage Capacity

Answer 1

1500 gallons of cryogenic liquid with an additional 10% vapor space (ullage) area above the cryogenic liquid tank
(150 more space)

Question 2

Operational Pressure 0 PSIG

Answer 2

On a tank being filled

Question 3

Operational Pressure 8 PSIG

Answer 3

On an idle tank

Question 4

Operational Pressure 10-50 PSIG

Answer 4

Tank in operation

Question 5

Operational Pressure 50 PSIG

Answer 5

Max

Question 6

Vacuum Integrity

Cold Tank

Answer 6

100 microns or less

Question 7

Vacuum Integrity

Warm Tank

Answer 7

200 microns or less

Question 8

Components

Answer 8

• Inner Shell
• Outer Shell
• Annulus (Vacuum Space)
• Pressure Buildup Coil
• Protective Devices

Question 9

Inner Shell

Answer 9

Stainless steel Internal baffles to prevent sloshing. Supported by heat conducting materials

Question 10

Outer Shell

Answer 10

Carbon steel material Welded in place in a frame supported by two stiffener rings

Question 11

Annulus

Answer 11

Filled with Perlite insulation 6” thickness

Question 12

RV-1 Storage Tank Relief Valve

Answer 12

• brass or stainless steel relief valve
• spring loaded seat
• lifts at 55 PSIG

Question 13

BD-1 Storage Tank Burst Disk

Answer 13

• circular, thin metal disc
• thin aluminum disc
• diaphragm ruptures @70 PSIG

Question 14

BD-3 Annular Space Burst Disk

Answer 14

• cylindrical
• spring and plate type relief valve
• burst @3 PSIG

Question 15

V-14 Tank Vacuum Valve

Answer 15

Isolate the vacuum pump from annulus

Question 16

CV-2 Pressure Buildup Coil Check Valve

Answer 16

Prevents back-flow of vapor from vapor space to the P.B.C.

Question 17

V-12 Rapid Pressurization

Answer 17

Admits 50 PSIG of O2 or N2 gas from storage flask via pressure regulator, to the inner tank vapor space

Question 18

V-9 Tank Drain Line Valve

Answer 18

Controls the flow of cryogenic liquid overboard for emergency dump only (Only with CO’s permission)

Question 19

V-10 Liquid Sample Valve

Answer 19

Fitted with hose connection for drawing a liquid sample

Question 20

V-23 Tank Fill Valve

Answer 20

Isolate tank from producer

Question 21

V-7 Full Trycock Valve

Answer 21

Provides indication that tank is full

Question 22

V-20 Liquid Transfer Valve

Answer 22

Controls the flow of cryogenic fluids from the storage tank to the transfer line