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

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.

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Cargo Tanks 5

MFG. S/N 1/97DATE MFR.BBH 04677

306 AL 1/97

5454-05454-H32

5

0 180

3400-2000-1100

9200

3

DOT MC CERT.

DESIGN PRES. PSIG AT oF MAX

TEST PRES. DATE

HEAD MAT’L SHELL MAT’L

CAP. BY COMPT. F/R U.S. GAL.

2700

1.5

PSIG

TOTAL

7.5

0.5

64,000MAX. LOAD LBS AT LBS./GAL. MAX

LMT. LD PSIG UNLD PSIG

GPM GPM

VEHICLE MFG. DALLAS TANK TRUCK CO.

Cargo Tanks 6

Multipurpose Plates•Is in addition to spec. or certification plate

•Is color coded along with fittingsMC-306/DOT-406=RedMC-307/DOT407=GreenMC-312/DOT-412=YellowNon-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-407MC-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 (406 -

5 psig)• Usually single shell aluminum

construction• Some older tanks may be constructed

of steel

Cargo Tanks 8

MC-306/DOT-406

Products And Hazard Class

Gasoline Class 3Diesel Class 3

Generally 9,000 gallons Maximum capacity

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Cargo Tanks 10

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Emergency shut-off– Air– Manual– Fusible links (fail at a maximum of 250oF)

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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

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MC-307/DOT-407

• Usually one to two compartments– Spec. plate identifies number of

compartment• Overturn protection• Generally 6,000 to 7,000 gallons

maximum capacity

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MC-307/DOT-407

Products And Hazard Class• Flammable & Combustible Liquids 3• Mild Corrosives 8• Poisons 6

MC-307/DOT-407

Horseshoe shapeHorseshoe shape Single Work PlatformSingle Work Platform

Single Outlet PipingSingle Outlet Piping40 psig Vapor Pressure40 psig Vapor Pressure

NFPA Objective 4-2.3.2

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MC-307/DOT-407

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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

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MC-312/DOT-412

Products and Hazard ClassCorrosive 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

MC 312(DOT 412)

Rounded EndsRounded Ends Small DiameterSmall Diameter“Cigar Shape”“Cigar Shape”

35 - 50 psig Working Pressure35 - 50 psig Working Pressure

Exterior Stiffner RingsExterior Stiffner Rings

NFPA Objective 4-2.3.2

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MC 331High 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 331High Pressure Gas

• Capacity

– Bobtail• 2,500 gallons

– Cargo Tank• 11,500 gallons

Cargo Tanks 25

MC 331High Pressure Gas

Products And Hazard Class• LPG Class 2• Anhydrous ammonia Class 2• Chlorine 2 - 5.1

MC 331Bolted Bolted

ManwayManwayLarge Hemisphere EndsLarge Hemisphere Ends

Cage Around PipingCage Around Piping

Up to 11,500 galUp to 11,500 gal

100 to 500 psig100 to 500 psig

NFPA Objective 4-2.3.2

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Cargo Tanks 31

MC 338Cryogenic 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 338Cryogenic Liquid

Product And Hazard Class• Oxygen 5.1 (2)• Hydrogen 2• Helium 2• Nitrogen 2

• Cryogenics exist as a liquid at - 130- 130ooFF and below

MC 338

Loading/Unloading Loading/Unloading Station at RearStation at Rear

Ends Normally FlatEnds Normally Flat

Loading (Sometimes Located Here)Loading (Sometimes Located Here)

5000 to 14,000 gal

23.5 to 500 psig 23.5 to 500 psig design pressuredesign pressure

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Tube Trailer

• 2 to 20 Cylinders• Cylinders 9” to 48”• Pressure 3,000 - 5,000 psi• Maximum Capacity 180,000 cu ft.• Max. Capacity in Canada 200,000 cu ft.

Cargo Tanks 36

Tube TrailerProduct 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

Dry Bulk CarriersCompressor UnitCompressor Unit

Large Sloping Large Sloping “V” or “W”“V” or “W” Shaped Bottom Shaped Bottom Up to 1500 cu. ft.Up to 1500 cu. ft.

Pneumatically UnloadedPneumatically Unloaded

Cargo Tanks 41

“V” or “W” Shape