Liquefied Gas Carrier

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Liquefied gas carrier operation - Cargo operation logbook

During cargo operations, the officer on watch shall enter into the logbook the items of cargo operations carried out while he is on watch, the measurements of ullage and the like, operational conditions of pumps, descriptions of the operations, and others.
Chief Officer shall give and enter all necessary instruction while operations on Tanker Cargo Operations Logbook for the authorized duty officers before leaving from Cargo Control Room.

The following instruction should be included:

(1) Specific items that must be paid attention on the particular operation

(2) Specific events, conditions that must be called Chief Officer immediately.

(3) Specific points, time that must be called Chief Officer.

Below is the most commonly used terms and their definitions used in gas carrier log book.

Drying :To remove moisture from cargo tanks, pipe-works, etc. In order to reduce the dew point and minimize potential ice formation problems.

Inerting :To reduce oxygen content in the cargo system to prevent flammable atmospheres in the subsequent gassing up Operation.

LNG carrier seaway

Purging :To replace inert gas (GN2) in the cargo tanks, etc. with vapor of the cargo to be loaded.

Cooldown :To reduce temperature of the cargo tank prior to loading in order to minimize thermal stresses and excessive tank pressures during loading.

Cooling stock :Which may be in use for changing cargo and cooldown operations (Coolant)

Loading :Which may involve cooling the product below delivered temperature.

Discharging :Which may involve heating refrigerated cargoes for discharge into pressurized storage.

Ballast voyage :Which may involve preparing the cargo tanks for a change of cargo stowage.

Changing cargo :Which may involve gas freeing, inerting, and regassing-up.

Preparation for inspection or dry-docking :Involving gas freeing by inerting followed by aeration.

Related Information:

Safety checklist for gas carrier

Reactivity of liquefied gas cargo and safety guideline

Preparation for loading LNG cargo

Drying of Cargo Tanks and preparation for loading LNG cargo

Inerting of Cargo Tanks prior loading LNG cargo

Gassing-up requirement for cargo tanks

Initial Cool Down of cargo tanks

LNG spill risk during marine transportation and hazards associated

Toxicity and associated health hazards in liquefied Gas Carrier

Safety check items prior loading LNG cargo

Defining various gas carrier types

Fuel flexibility of LNG ships

LNG ship spillage risk

LNG shipment

Initial Cool Down of cargo tanks

Leaks on the Cargo System, Continuous Flow - how to prevent

LNG tank leaks and immediate action by gas carriers

Leaks from a Loading Arm due to Tidal or Current Effects

Minor or major leaks from LNG tanks

Procedures for LNG cargo discharging

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