Valves used simultaneously to isolate a specific section of a system for maintenance or inspection of that section.



Related Terms

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.

CROSSOVER

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.

TAG OUT

Hanging 'Do Not Operate' tags on and locking out equipment to ensure that is not operated while maintenance or inspection is carried out.

HOT DECK

The section of a mixed air zoning system containing the heating elements.

GUIDANCE STATION EQUIPMENT

The ground-based portion of the missile guidance system necessary to provide guidance during missile flight; it specifically includes the tracking radar, the rate measuring equipment, the data link equipment, and the computer, test, and maintenance equipment integral to these items.

CARGO PRESSURE RELIEVING SYSTEM

A system CONSISTing OF 1 OR MORE RELIEF VALVES SET AT A PRESSURE CORRESPONDING TO THE GAUGE PRESS OF CARGO AT REFERENCE TEMPerature AS DEFINED ABOVE AN OVERRIDE ARRANGEMENT, WHENEVER NECESSARY, TO PREVENT ITS NORMAL OPERATION. ARRANGEMNT INCLUDES FUSIBLE ELEMENT DESIGNED TO MELT BETween 98 AND 104°C AND CAUSE RELIEF VALVES AS SPEC IN 1 TO BECOME OPERABLE, LOCATED IN VICINITY OF RELIEF VALVES. THE SYSTEM BECOME OPERABLE EVEN IF: LOSS OF POWER, NOT DEPENDENT ON ANY SOURCE OF SHIP’S POWER.

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.

AMPERE

The base unit of electric current in the International System of Units; it is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section

COOLING POWER

A parameter devised to measure the air's cooling effect upon a human body; it is determined by the amount of heat required by a device to maintain the device at a constant temperature (usually 34 C); the entire system should be made to correspond, as closely as possible, to the external heat exchange mechanism of the human body.

AUTOMATED IDENTIFICATION SYSTEM (AIS)

A system used by ships and Vessel traffic Service (VTS) principally for the Identification and the locating of vessels. AIS provides a means for ships to electronically exchange ship data including: Identification, position, course, and speed, with other nearby ships and VTS stations.

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