1. CARGO TANK MOTOR VEHICLES
Dallas Fire Department
CARGO TANK MOTOR VEHICLES
Cargo Tanks

2. DOT Definition
A tank intended primarily for the carriage of liquids or gases
A tank that is permanently attached to or forms any part of any motor vehicle
Is loaded of unloaded without being removed from a motor vehicle
Is not fabricated under a specification for cylinders, portable tanks, tank cars, or multiunit tank car
Cargo Tanks

3. MC vs. DOT
MC 306 Certified before August 31, 1995 and will have spec. plate
DOT 406 Certified on August 31, 1995 or later will have certification plate
Cargo Tanks

4. Specification Plate and Certification Plates
Helps with the identification of tank type by providing specific information. Spec. Plates located on passenger side front of tank. Certification Plates located on drivers side front of tank.
Cargo Tanks

5. Dallas Fire Department
VEHICLE MFG.
DALLAS TANK TRUCK CO.
BBH 04677
DATE MFR.
1/97
MFG. S/N
306 AL
1/97
DOT MC
CERT.
DESIGN PRES.
PSIG AT
180
oF MAX
TEST PRES. 5
PSIG
DATE 3
HEAD MAT’L
5454-H32
SHELL MAT’L
5454-0
CAP. BY COMPT. F/R
U.S. GAL.
If unsure of what type of tank you are dealing with you
2700
TOTAL
9200
MAX. LOAD
64,000
LBS AT
7.5
LBS./GAL. MAX
LMT. LD
1.5
PSIG
UNLD
0.5
PSIG
GPM
GPM
Cargo Tanks
Cargo Tanks

6. Multipurpose Plates Is in addition to spec. or certification plate
Is color coded along with fittings
MC-306/DOT-406=Red
MC-307/DOT407=Green
MC-312/DOT-412=Yellow
Non-specification cargo tank=Blue
Identifies the specification under which the cargo tank is operated
Common multipurpose configurations are:
MC-306/DOT-406 / MC-307/DOT-407
MC-307/DOT-407/MC-312/DOT-412 (Nalco uses this)
Cargo Tanks

7. MC-306/DOT-406 Most oval cross section
Non pressurized - less than 3 psi ( psig)
Usually single shell aluminum construction
Some older tanks may be constructed of steel
Cargo Tanks

8. Products And Hazard Class
MC-306/DOT-406
Generally 9,000 gallons Maximum capacity
Products And Hazard Class
Gasoline Class 3
Diesel Class 3
Cargo Tanks

9. Cargo Tanks

10. Cargo Tanks

11. Emergency shut-off Air Manual
Fusible links (fail at a maximum of 250oF)
Cargo Tanks

12. MC-307/DOT-407 Circular cross section Low pressure (up to 40 psi)
Double shell construction with insulation is most common
Some insulated tanks may not appear circular
Cargo Tanks

13. MC-307/DOT-407 Usually one to two compartments Overturn protection
Spec. plate identifies number of compartment
Overturn protection
Generally 6,000 to 7,000 gallons maximum capacity
Cargo Tanks

14. MC-307/DOT-407 Products And Hazard Class
Flammable & Combustible Liquids 3
Mild Corrosives 8
Poisons 6
Cargo Tanks

15. MC-307/DOT-407 Horseshoe shape Single Work Platform
40 psig Vapor Pressure
Single Outlet Piping
NFPA Objective

16. MC-307/DOT-407
Cargo Tanks

17. MC-312/DOT-412 Circular cross section Smaller diameter than DOT 407
External reinforcement ribs
May be found in double shell construction
Usually single compartment
Cargo Tanks

18. MC-312/DOT-412
Overturn protection and splash protection at dome cover/valve location
Generally 5,000 to 6,000 gallons capacity
Cargo Tanks

19. Products and Hazard Class
MC-312/DOT-412
Products and Hazard Class
Corrosive and High Density Liquids
Sulfuric Acid (15.34 lb.) Class 8
Nitric Acid (12.54 lb.) Class 8
Sodium Hydroxide (17.76 lb.) Class 8
Poison Class 6
Cargo Tanks

20. MC 312 (DOT 412) Rounded Ends Exterior Stiffner Rings
Small Diameter “Cigar Shape”
psig Working Pressure
NFPA Objective

21. Cargo Tanks

22. Cargo Tanks

23. MC 331 High Pressure Gas Circular cross section Rounded heads
Design pressure 100 to 500 psi
Single shell, non-insulated tank
Upper 2/3 painted white or highly reflective color
Cargo Tanks

24. MC 331 High Pressure Gas Capacity Bobtail Cargo Tank 2,500 gallons
Cargo Tanks

25. MC 331 High Pressure Gas Products And Hazard Class LPG Class 2
Anhydrous ammonia Class 2
Chlorine
Cargo Tanks

26. MC 331 Bolted Manway Large Hemisphere Ends Up to 11,500 gal
Cage Around Piping
100 to 500 psig
NFPA Objective

27. Cargo Tanks

28. Cargo Tanks

29. Cargo Tanks

30. Cargo Tanks

31. MC 338 Cryogenic Liquid
Well insulated “thermos bottle design with flat tank ends
Double shell tank with relief protection
Often have vapors discharging from relief valve
Cargo Tanks

32. MC 338 Cryogenic Liquid Product And Hazard Class Oxygen 5.1 (2)
Hydrogen 2
Helium 2
Nitrogen 2
Cryogenics exist as a liquid at - 130oF and below
Cargo Tanks

33. MC 338 5000 to 14,000 gal Ends Normally Flat
Loading (Sometimes Located Here)
Loading/Unloading Station at Rear
23.5 to 500 psig design pressure

34. Cargo Tanks

35. Tube Trailer 2 to 20 Cylinders Cylinders 9” to 48”
Pressure 3, ,000 psi
Maximum Capacity 180,000 cu ft.
Max. Capacity in Canada 200,000 cu ft.
Cargo Tanks

36. Tube Trailer Product And Hazard Class Helium Class 2 Hydrogen Class 2
Oxygen Class 2
Cargo Tanks

37. Cargo Tanks

38. Dry Bulk Carriers Capacity up to 1,500 cubic feet
Carry Very Heavy Loads; centrifugal
force cause of many rollovers
Uses air pressure for product transfer
Static charges are a common hazard
Cargo Tanks

39. Dry Bulk Carriers Products And Hazard Class
Ammonium Nitrate Fertilizer Class 5.1
Cement Class 9
Dry Caustic Soda Class 8
Cargo Tanks

40. Dry Bulk Carriers Compressor Unit Pneumatically Unloaded
Large Sloping “V” or “W” Shaped Bottom
Up to 1500 cu. ft.

41. “V” or “W” Shape
Cargo Tanks