FAQ

FAQ

Frequently Ask Questions

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Term

Definition

 

 

0 or Ph

Phase. Applied to electrical power supply

 

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AAR

American Association of Railroads

ACC

ACCEPTABLE CONTAINER CONDITION

Approval Agency/Inspection Authority

Organization approved by a competent authority to inspect and certify equipment

ASME

American Society of Mechanical Engineers. Publisher of internationally recognized codes for pressure vessels.

ATP

Agreement on the International Carriage of Perishable Foodstuffs and on the special equipment to be used for such carriage.

 

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Ball Valve

A valve which is closed by rotating a ball with a central hole through 90 degrees

BAM

Bundesanstatl Fur Materialforschung und Prufung.

Bar

Unit of pressure. (International Bar = 100 Kilopascal = 14.5 psi)

BS

British Standards. UK standards organization

BS Table D

Specification for bolted flanges for pressure applications.

BSP

British Standards Pipe Thread. A thread form common on pipe fittings.

BSW

British Standard Whitworth. A screw thread commonly used on clamp bolts. Sometimes interchangeable with ISO metric coarse threads.

Bursting Disc

A pressure-relief device which breaks at a pre-determined pressure. Used for emergency relief or as a hermetic seal for relief valves to prevent the release of toxic or especially hazardous vapors.

Butterfly Valve

A valve containing a circular plate which rotates through 90 degrees to close the opening.  Easy to clean but restricts the fluid flow slightly.

 

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Camlock

A quick-release type coupling sometimes used on bottom-outlet systems.

CCC

Customs Convention on Containers.  Allows temporary admission of tanks into member countries.

CFM

Cubic Feet per Minute. Imperial measurement of rate flow. Usually applied to airflow

CFR

Code of Federal Regulations

Closed Cup (CC)

Describes a method used to ascertain the flash point of a liquid.

Competent authority

Regulating authority for national government.

CSC

International Convention for Safe Containers

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Design pressure

The pressure used to calculate the thickness of the shell of the tank.  Design codes require the design pressure to equal or exceed the maximum allowable working pressure or equal or exceed the test pressure depending on which code is applicable.

Dipstick (dip rod)

Calibrated stainless steel bar situated in the manhole at the volumetric center to measure the level to which the tank has been filled.

DNV

Det Norske Veritas (a Norwegian approval society)

DOT US

Department of Transport. Competent authority for the United States of America.

 

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EIR/RE

Equipment Interchange Report/Repair Estimate

 

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Filling ratio 

Maximum permissible mass of cargo as a percentage of the capacity.

Flame Trap

A metal gauze which permits gases to pass through but does not permit flame to pass (flashback)

Foot valve

Internal bottom-outlet valve situated in the knuckle of the dished end. Also know as emergency valve. Specified for hazardous products.

 

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GRP (FRP)

Glass-reinforced plastic (fibre-reinforced polyester) resin sheet with a glass-fibre used to encase insulation.

 

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IMO

International Maritime Organization

 

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In Hg

Inches of Mercury. Unit of measurement for low pressures (usually vacuum).

ISO

International Standards Organization.  An advisory body, whose recommendations have been accepted and incorporated into the official technical standards of many countries in the area of the transportable container, the aim of the organization is to achieve a standard approach to cargo container design and handling.

ISO 9002

An internationally recognized quality system intended to satisfy a user's needs or requirements.

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Kg/cm2

Kilograms per square centimeter. (Unit of pressure)

K Pa (KN/M2)

Kilopascal (Unit of pressure)

 

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MARPOL 

International convention for the prevention of pollution from ships.

MAWP

Maximum allowable working pressure

MGW

Maximum Gross Weight = TARE + MAXIMUM PAYLOAD

MSDS

Material Safety Data Sheet. This identifies the physical properties and hazards of product.

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NPT 

National Pipe Thread. The thread form for pipe fittings used in the USA

 

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Passivation

A process which encourages the corrosion resistance of stainless steel by the forming of chrome oxide layer on the steel surface.

Payload

Mass of cargo that can be carried

PCD

Pitch Circle Diameter. Diameter of circle upon which bolt holes are positioned.

Pickling

A chemical or electrochemical method of removing mill scale, rust, metal oxides and similar coatings from steel.

Plate valve

A valve consisting of a plug which is moved in and out of its seating by an operated mechanism.  Most foot valves and some top-outlet valves are plate valves.

PSI (Ib/in2)

Pound per square inch (unit of pressure)

PTFE

Polytetrafluorethylene. A plastic used for seals and bearings. Has a wide temperature tolerance and is resistant to most chemicals.

P/V Valve

A combined pressure and vacuum-relief valve to protect the tank against excessive overpressure and vacuum.  

PR Valve

A pressure relief valve to protect the tank against accidental overpressure.  As the P/V valve (above) but without the vacuum relief facility.

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Reference Temperature

A temperature allocated to particular zones throughout the world.  

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SNCF

Societe Nationale de Chmin de Fer Francais.  French Railways competent authority.

Steam trap

Valve which permits only water to pass

SWG

Standard Wire Gauge. Standards for metal sheet and wire thickness.

Syphon tube (dip tube)

A tube from the top outlet to the bottom of the tank which allows liquid to be discharged or loaded through the top outlet/inlet by means of pressure (or suction)

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Tare

Mass of an empty tank in operational condition

Thermostat 

A temperature sensor operating an electrical switch. Used to maintain a temperature within set limits.

TIR

International agreement to standardize the Customs sealing of road vehicles crossing international boundaries.  This agreement does not apply to containers which must be approved under the Customs Convention on Containers.          The term TIR however is still commonly used to denote the approved sealing on a container.  (See International Transport of Goods Under Customs Seal.  Conditions of Approval Publication VE 505 Published by DOT UK)

Total containment pressure

The sum of the internal pressures to which a tank container is subjected in normal service.  This total pressure must not exceed the maximum allowable working pressure of the tank.

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UIC

Union International des Chemin de Fer.  Publisher of regulations for tank container marking and registration for international rail transport.

Ullage (Outage)

Free space within vessel after loading.

UN Number

A numbering system recommended by the United Nations Committee of Experts on the Transport of Dangerous Goods for the aim of worldwide harmonization in this field.

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Vapor pressure

The developed pressure within a closed vessel containing a liquid.  Each liquid  has its own vapor pressure which varies with temperature

Viton A

A synthetic rubber used for seals. Has good sealing properties and is tolerant of a wide range of chemical.

 

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