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GLOSSARY OF TRUCK TERMS

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Sacrificial Device

See 49 CFR 178.345-1 (c). (Also see Shear Section).

Seam, Girth

Sensor, High Level

A liquid actuated sensor installed in a secondary shut-off system. Also, this sensor is sometimes used as a primary shut-off system. The signal from this sensor stops the loading pumps or closes the emergency valve upon overfill. (See Shutoff System, Secondary).

Sensor, Liquid Level

See Indicator, Liquid Level.

Sensor, Retained

A liquid actuated sensor installed in the bottom of a compartment to indicated the presence of liquid.

Shear Section, DOT 400 Series Cargo Tanks

See 49 CFR 178.345-1 (c). (Also see Sacrificial Device).

Shear Section, MC 300 Series Cargo Tanks

A machine groove located outboard of an emergency valve seat and within 4 inches of the vessel which should break under strain and leave the emergency valve seat and its attachment to the vessel and the valve head intact and capable of retaining product.

Shell, Tank

See 49 CFR 178.345-1 (c).

Shutoff System, Secondary

A system that provides overflow protection during bottom loading.

Slope

Difference in height between highest and lowest points of the tank bottom.

Slope Sheet

Panels located at each end or side of compartment which direct product by gravity to hoppers.

Specification, MC/DOT

The U.S. DOT Motor Carrier Specification for tank vehicles authorized to carry specified hazardous materials.

Splash Guard

A device which deflects road spray.

Stack

The exhaust pipe for tanks with burners.

Steam Panel

See Heat Panel.

Stick, Dip

See Dip Stick.

Stiffener, Ring

See Ring Stiffener.

Stretching

See 49 CFR 180.403.

Structure, Connecting

See 49 CFR 178.345-1 (c).

Subframe

The frame to which the undercarriage is attached.

Sump

See 49 CFR 178.345.1 (c).

Sump, Cleanout

The low point of a tank which may be opened for cleaning.

Swivel Joint

A movable metallic product transfer conductor usually used on discharge lines to eliminate the bending or twisting of hoses.

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