See 49 CFR 180.403.
See 49 CFR 180.403
Replacement Barrel
To completely replace the vessel weldment of an existing cargo tank with a newly manufactured vessel weldment using only new materials.
Ring Stiffener
Structure encircling the tank either inside or outside the tank shell to maintain the shape of the tank and its structural stiffness when under pressure/vacuum.
Rollover Protection
See Overturn Protection
Abbreviation for Recommended Practice.
Rupture Disc (A frangible vent)
A safety device which fails at a predetermined pressure and thus protects a pressure vessel from being over pressurized. (Also see Vent).


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