Tank Car SpecialistTraining Support Package

November 2014

Module 6: Pressure Tank Cars

Training Support Package

Tank Car Specialist

IntroductionPressure tank cars are those with a tank test pressure between 100 and 600 psi that are used for transportation of liquefied compressed gases and liquid hazardous material (HazMat).

Upper tank fittings are enclosed in a protective housing. Pressure tank cars do not normally have bottom fittings.

Tank Car Specialist

Enabling Learning Objectives6-1 Identify the components that are normally found on a

pressure tank car for loading and unloading, determining capacity, pressure relief, and security measures.

6-2 Identify the location, function, and arrangement of the following as commonly found on a pressure tank car:

• Liquid Valves• Vapor Valves• PRD-Pressure Relief Devices• Sample Ports• Gauging Devices• Thermometer Wells• Vacuum Relief Devices

Tank Car Specialist

Enabling Learning Objectives6-3 Demonstrate the proper use of the following devices in

controlling a release, determining the conditions within the tank car, and determining the capacity of a pressure tank car while participating in a realistic scenario-based derailment: 

• Liquid Valves• Vapor Valves• PRD-Pressure Relief Devices• Sample Ports• Gauging Devices• Thermometer Wells• Vacuum Relief Devices

Tank Car Specialist

DOT-105J400W

Tank Car Specialist

DOT-112J340W

Tank Car Specialist

Pressure Tank Car

• Protective housing• Valve access ports• No other visible devices

Tank Car Specialist

SAFETY FEATURESFeature and Class

DoubleShelf

Couplers

HeadShields

Spray–onThermal

Protection

JacketThermal

Protection

JacketInsulation

105 A X X

105 S X X X

105 J X X X X

112 A X

112 S X X

112 T X X X

112 J X X X

Tank cars containing Flammable compressed gases must be either a T or J specification.

Also, all openings into the tank must be equipped with excess flow check valve (excluding the pressure relief device and thermometer well ).

Tank Car Specialist

DOT 105 A Insulated Jacket

Tank Car Specialist

DOT 105 J 500 W

Tank Car Specialist

Thermal Protection 105 J

11

• Jacketed insulated thermal protection

Jacket

Insulation- 5”

Tank material

Tank Car Specialist

DOT 105 S 300 W

Tank Car Specialist

Thermal Protection 112 “J”

13

Jacketed thermal protection

Jacket Insulation- 1” to 2”Tank material

Tank Car Specialist

DOT 112 J 340 W

Tank Car Specialist

DOT 112 T 400 W

Tank Car Specialist

Test Pressure

• Range 100 to 600 psi

Tank Car Specialist

Capacity Range4,000 to 45,000 gallons• 49 CFR 179.13 – (built after 11/30/1970)

Cannot exceed 34,500 gal or gross rail weight 263,000 lb

AAR Standards - between 263,000 and 286,000 lbs but no increase in commodity

• Built prior to 7/01/1974 and 40 yrs service – eligible for 50 yrs with AAR compliance

Tank Car Specialist

Valves

18

Angle Valve Pressure Relief Valve

Tank Car Specialist

Excess Flow Valve

Tank Car Specialist

Pressure Car ValvesPressure Relief Device

• PRD-Pressure Relief Device

• Normally set at 75% of test pressure

Tank Car Specialist

Midland Internal Safety Relief Valve

Tank Car Specialist

DOT 112 J 340 W

•340 Tank Test Pressure

•Safety Relief Valve 280.5 or 82.5% of Tank Test Pressure

Tank Car Specialist

Slip Tube Gauging Device

Tank Car Specialist

Slip Tube Gauging Device

Tank Car Specialist

Slip Tube Gauging Device

Tank Car Specialist

Slip Tube Gauging DeviceQuick Release Cover

OPERATING INSTRUCTIONSStep 1 Grip handles and remove housing.

Step 2 Move packing nut lever in a counterclockwise direction.

Step 3 Press rod latch and pull gauge rod upward until it is above the liquid.

Step 4 Open the control valve counterclockwise, keep turning until vapor flows from valve orifice.

Step 5 Push gauge rod down slowly until flow changes to liquid.

Step 6 Fish gauge by moving it upward and downward several times over short distances above and below the liquid level until liquid level is determined by the vapor-liquid flow.

Step 7 Close the valve clockwise. Set only finger tight. Do not use wrench.

Step 8 Read graduations at top of pointer.

Step 9 Press rod latch and push gauge rod completely down.

Step 10 Tighten packing nut lever clockwise (reverse of Step 2).

Tank Car Specialist

Magnetic Gauging Device

27

• Magnetic or closed type gauging devices

Tank Car Specialist

Gauging Device

Tank Car Specialist

Sample Valve

• Can be used to take a sample of product

• Can be used to check pressure in tank car

Tank Car Specialist

Thermometer Well

30

• Using a thermometer to insert into the well to check the temperature of the lading

Tank Car Specialist

Pressure Car Valves

Tank Car Specialist

Pressure Car Valves

Tank Car Specialist

Pressure Car Valves

Tank Car Specialist

Pressure Tank Car Common Leaks

Leak Source Corrective Action Tools Required

Gauging device packing Tighten packing gland nut Large adjustable wrenchPipe wrench

Gauging device angle valve

Close angle valve and insert outlet plug

Small adjustable wrench

Liquid/vapor angle valve Close valve and insert outlet plug

Large adjustable wrenchPipe wrench

Angle valve packing Close valve or tighten pack gland nuts

Small adjustable wrench,Allen wrench

Angle valve gasket Tighten stud nuts Large socket wrench

Sample valve seat Close valve and insert outlet plug

Small adjustable wrench

Thermometer well Tighten cap Large adjustable wrench

Relief valve seals Replace “O” rings or rubber washers

Advanced training

Tank Car Specialist

DOT 105 A 500 W

Tank Car Specialist

DOT 105 J 500 W

Tank Car Specialist

Chlorine Loading and Unloading Arrangement

Tank Car Specialist

New Chlorine Loading and Unloading Arrangement

Tank Car Specialist

External Relief Valve

Crosby Midland

Tank Car Specialist

Chlorine Excess Flow Valve

Transquip USA A7837A Valve

Tank Car Specialist

Chlorine C Kit

Tank Car Specialist

Chlorine Common Leaks

Leak Source Corrective Action Tools Required

Angle valve packing Close valve or tighten packing gland nuts or apply C Kit

Small adjustable wrench(11/16”) Chlorine C Kit

Angle valve seat Apply valve outlet plugs or apply C Kit

Large adjustable wrench (31/32”) Chlorine C Kit

Angle valve gasket Tighten stud nuts or apply C Kit. Apply C Kit

Crowsfoot wrench ( 1 ¼”)Chlorine C Kit

Safety relief valve Tighten stud nuts or apply C Kit

Chlorine C KitCheck Pressure in car

Safety relief valve Gasket Apply C Kit Crowsfoot wrench ( 1 ¼”)Chlorine C kit

Manway cover gasket Tighten stud nuts or apply C Kit

Socket wrench ( 1 13/16”)

Tank Car Specialist

CO2 HOUSING

Tank Car Specialist

Regularly Vents CO2

Tank Car Specialist

DOT 113

Tank Car Specialist

DOT 113

Tank Car Specialist

LNG Tender

Tank Car Specialist

LNG Tender

Tank Car Specialist

LNG Tender

Tank Car Specialist

Conclusion6-1 Identify the components that are normally found on a

pressure tank car for loading and unloading, determining capacity, pressure relief, and security measures.

6-2 Identify the location, function, and arrangement of the following as commonly found on a pressure tank car:

• Liquid Valves• Vapor Valves• PRD-Pressure Relief Devices• Sample Ports• Gauging Devices• Thermometer Wells• Vacuum Relief Devices

Tank Car Specialist

Conclusion6-3 Demonstrate the proper use of the following devices in

controlling a release, determining the conditions within the tank car, and determining the capacity of a pressure tank car while participating in a realistic scenario-based derailment: 

• Liquid Valves• Vapor Valves• PRD-Pressure Relief Devices• Sample Ports• Gauging Devices• Thermometer Wells• Vacuum Relief Devices