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Is there a difference in the definitions of tank and vessel from an engineering perspective?
Wiki User
∙ 14y ago
Pressure vessels are constructed to withstand a specific Operating Pressure and have a Maximum Allowable pressure. They may be Horizontal or Vertical Cylindrical, or Spherical, Hemispherical, Small cylinders as for LPG...etc.
They will be fitted with Safety Relief Systems.
Tanks are vessels used at Atmospheric pressure. If pressure is likely to build up in a tank, as when pumping into it, safety relief systems are installed to offset this possibility.
Also, Vacuum breakers are installed for when liquid is being pumped out. A vacuum breaker may incorporate a gas injection (generally an Inert gas like Nitrogen), to maintain a slight positive pressure in the tank depending on the liquid being stored.
Petroleum tankage is very often of the 'Pontoon' or 'Double Deck' type, 'Floating Roof tank' having very little vapour space to minimise vapour loss. The roof 'floats' on the liquid and rises and falls with changes in liquid level.
It also has a special 'Pantograph' seal system against the tank inner wall
Wiki User
∙ 14y ago
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