Maximum allowable working pressure is the maximum gauge pressure permissible in the top of a cargo tank for a designated temperature. This pressure is based on calculations for each element in a cargo tank using nominal thicknesses, exclusive of allowances for corrosion and thickness required for loadings other than pressure. It is the basis for the pressure setting of the pressure-relieving devices protecting the vessel which is known as the maximum allowable relief valve setting or MARVS. The design pressure may be used in place of the maximum allowable working pressure in cases where calculations are not made to determine the value of the latter.

Related Terms

RESTRICTOR

A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.

AFT

Back of the vessel.

ASTERN

A backward movement of a vessel

ATHWARTSHIP

Across the ship, at right angles to the fore-and-aft centerline

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

BULK CARGO

Cargo such as oil, coal, ore, woodchips, etc. not shipped in bags or containers

UPBOUND

A vessel traveling upstream.

CONTAMINANT CAPACITY

The weight of a specified artificial contaminant that must be added to the influent to produce a given differential pressure across a filter at specified conditions. Used as an indication of relative service life. Also known as Dirt capacity, Dust capacity

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

BEAM

The width of a ship. Also called breadth.

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