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The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one section of cargo tanks to another section.



Related Terms

SINGLE POINT MOORING

(SPM) - A mooring system to which a tank vessel moors to a single point only normally at the bow. This system allows the vessel to swing in a 360 axis depending on wind or current direction without disconnecting or interrupting the cargo operations.

SPM

Single Point Mooring - a mooring system to which a tank vessel moors to a single point only normally at the bow. This system allows the vessel to swing in a 360 axis depending on wind or current direction without disconnecting or interrupting the cargo operations.

HS

Harmonized System of Codes - an international goods classification system for describing cargo in international trade under a single commoditycoding scheme. Developed under the auspices of the Customs Cooperations Council (CCC), an international Customs organization in Brussels, this code is a hierarchically structured product nomenclature containing approximately 5,000 headings and subheadings. It is organized into 99 chapters arranged in 22 sections. Sections encompass an industry (e.g., Section XI, Textiles and Textile Articles); chapters encompass the various materials and products of the industry (e.g., Chapter 50, Silk; Chapter 55, Manmade Staple Fibers; Chapter 57, Carpets). The basic code contains fourdigit headings and sixdigit subheadings. Many countries add digits for Customs tariff and statistical purposes. In the United States, duty rates will be the eightdigit level; statistical suf xes will be at the tendigit level. The Harmonized System (HS) is the current U.S. tariff schedule (TSUSA) for imports and is the basis for the tendigit Schedule B export code.

BOTTOM

  1. The underside of a vessel; the portion of a vessel that is always underwater.
  2. A cargo hold.

EXPANSION TRUNK

A section of free space above the top of a oil cargo tank allowing for expansion of the oil with minimal free surface consequences.

HARMONIZED SYSTEM OF CODES (HS)

An international goods classification system for describing cargo in international trade under a single commoditycoding scheme. Developed under the auspices of the Customs Cooperations Council (CCC), an international Customs organization in Brussels, this code is a hierarchically structured product nomenclature containing approximately 5,000 headings and subheadings. It is organized into 99 chapters arranged in 22 sections. Sections encompass an industry (e.g., Section XI, Textiles and Textile Articles); chapters encompass the various materials and products of the industry (e.g., Chapter 50, Silk; Chapter 55, Manmade Staple Fibers; Chapter 57, Carpets). The basic code contains fourdigit headings and sixdigit subheadings. Many countries add digits for Customs tariff and statistical purposes. In the United States, duty rates will be the eightdigit level; statistical suf xes will be at the tendigit level. The Harmonized System (HS) is the current U.S. tariff schedule (TSUSA) for imports and is the basis for the tendigit Schedule B export code.

RESTRICTED GAUGING

A system employing a device, which penetrates the tank and which, when in use, permits a small quantity of cargo vapor or liquid to be expelled to the atmosphere. When not in use, the device is kept completely closed.

DEEPWELL PUMP

A type of centrifugal cargo pump commonly found on gas carriers. The prime mover is usually an electric or hydraulic motor. The motor is usually mounted on top of the cargo tank and drives, via a long transmission shaft, through a double seal arrangement, the pump assembly located in the bottom of the tank. The cargo discharge pipeline surrounds the drive shaft and the shaft bearings are cooled and lubricated by the liquid being pumped.

MAXIMUM ALLOWABLE WORKING PRESSURE

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.

SUBMERGED PUMP

A type of centrifugal cargo pump commonly installed on gas carriers and in terminals in the bottom of a cargo tank. It comprises a drive motor, impeller and bearings totally submerged by the cargo when the tank contains bulk liquid.

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