DANGEROUS CARGO ENDORSEMENT

1) Certificate of Competence - a certificate which endorses officer competency. 2) Certificate of Compliance - a term used to describe a document issued by the USCG to Chemical and Gas Carriers after they have met the requirements of the COC inspection described in 46 CFR and parts of 33 CFR. Formerly known as LOC or Letter of Compliance. This document when issued is valid for a period of two years but requires an annual re-examination to ensure compliance.

A refrigerant gas whose full name is monochlorodifluoromethane. Colorless, odorless, and non-flammable. It has a relatively low toxicity with a TLV of 1000 ppm. It is used on gas carriers and also on other vessels and applications where cooling and refrigeration are required, i.e. air conditioners, cargo refrigeration units etc..

(COC) A relatively new term (2001) used to describe a document issued by the USCG to Chemical and Gas Carriers after they have met the requirements of the COC inspection described in 46 CFR and parts of 33 CFR. Formerly known as LOC or Letter of Compliance. This document when issued is valid for a period of two years but requires an annual re-examination to ensure compliance.

A certificate issued by a flag administration confirming that the structure, equipment, fittings, arrangements and materials used in the construction of a gas carrier are in compliance with the relevant Gas Code. Such certification may be issued on behalf of the administration by an approved classification society.

Inerting means: (i) the introduction of inert gas into an aerated tank with the object of attaining an inert condition suited to a safe gassing-up operation. (ii) the introduction of inert gas into a tank after cargo discharge and warming-up with the object of:— (a) reducing existing vapor content to a level below which combustion cannot be supported if aeration takes place (b) reducing existing vapor content to a level suited to gassing-up prior to the next cargo (c) reducing existing vapor content to a level stipulated by local authorities if a special gas-free certificate for hot work is required — see gas-free condition.

R22 is a refrigerant gas whose full chemical name is monochlorodifluoromethane and whose chemical formula is CHCIF2. It is colorless, odorless and non-flammable. It is virtually non-toxic with a TLV of 1,000 ppm. Its relatively low toxicity and flammability levels render it suitable for use on gas carriers and is approved for such use under the IGC Code

A pump used to increase the discharge pressure. Booster pumps on shore are often used on tankers when pumping to shore tanks a long distance away from the vessel or up a hill thereby assisting the ships main cargo pumps. Can also be used on or for gas carriers in managing gas pressures.

When chemical carriers load high value and very pure products, they will commence loading until about one foot of cargo is in the bottom of the tank, then stop. They will take a sample this cargo, known as the foot sample up the facility's lab for analysis to see if during the loading of this one foot of cargo there was any contamination. If not, they will resume loading the tank until completion. If contamination is present in the foot sample they will try to determine the source, while they pump the now off spec cargo to the shore, and start over again, It is hoped that the amount loaded during the foot of cargo is enough to clean the contamination from the tank and piping. This is done to prevent the entire tank being loaded and then contaminated thereby requiring the full cargo to be reprocessed.

Are centrifugal pumps of special design installed above an individual tank with a long vertical shaft with an impeller extending to the tank bottom. Used mainly on product, chemical, and gas carriers where segregated piping systems are required. The cargo discharge pipeline surrounds the drive shaft and the shaft bearings. Thus they are normally cooled and lubricated by the cargo being discharged from the tank.

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.