Cargo Tanks, Railroad Tanks and Fixed Storage Tanks

Question 1

Oval cross-section on most indicates an atmospheric pressure tank (less than 4 psi)

Answer 1

MC-306 / DOT-406

Pressure

Question 2

Circular cross-section or noninsulated version with visible strengthening rings. Stainless steel shell

Answer 2

MC-307 / DOT-407

Low Pressure

Question 3

Narrow circular cross-section on noninsulated version with visible strengthening rings.

Answer 3

MC-312 / DOT-412

Corrosive

Question 4

Usually a single compartment unit constructed of top quality seamless or welded steel; circular cross-section with rounded ends or heads. Steel may be quench tempered (QT) or non-quenched tempered (NQT)

Answer 4

MC-330 / MC-331

High Pressure

Question 5

Large, well insulated ‘thermos bottle’ design.

Answer 5

MC-338

Cryogenic

Question 6

Horizontal tank with flat or nearly flat ends

Answer 6

Non-Pressure Tank Car

Question 7

Cylindrical steel or aluminum tank with rounded ends.

Answer 7

Pressure Tank Car

Question 8

Well-insulated tank-within-a-tank or ‘thermos bottle’ design.

Answer 8

Cryogenic Tank Car

Question 9

Welded steel tank with vertical cylindrical walls supporting a fixed flat or conical roof, with an internal floating roof or pan that floats on the surface of the product

Answer 9

Covered Floating Roof or Flat Roof

Question 10

Fixed Site Storage Tanks

1. Cone roof tank pressure,
2. Construction material,
3. Diameter,
4. Capacity,
5. Vapor space,
6. Operational hazards
7. Insulated or uninsulated?

Answer 10

1. Atmospheric
2. Steel (new) but older tanks are higher risk because they are Riveted.
3. 20 to 200+ft
4. 1,000 to 100,000+ barrels
5. Vapor space between roof the liquid level and the roof
6. Weak roof-to-shell seam for emergency venting
7. May be insulated