Liquefied Gas Carrier

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Electrical equipment in hazardous areas of liquefied Gas carriers

Carrying and handling liquefied gas cargo onboard poses significant potential hazards including risk of injury or death,threats to environment and each person working on a gas carrier and terminal ashore needs to understand the risks involved, obtain the necessary training and take all the needed precautions.

Electrical Equipment and Regulations

i) The electrical installations on gas carriers are subject to the requirements of the flag administration, classification societies, IMO and the International Electro-technical Commission (IEC). Part of the purpose of these requirements is to minimize the risk of explosion and fire.

ii) Areas and spaces are classified as “gas safe” or “gas dangerous”, depending on the risk of cargo vapor being present.

iii) Electrical equipment in a place regarded as dangerous has to be of special construction, and certified safe. Portable equipment taken into the area should also be certified safe.

LNG carrier underway
Fig:LNG carrier underway

Certified Safe Electrical Equipment

The types of equipment recognized as safe for dangerous areas fall into the categories described below :

i) Intrinsically Safe Equipment:

Intrinsically safe equipment relies on low power circuits to limit the maximum energy available to less than that necessary to ignite a flammable mixture under normal and certain fault conditions.

To use of intrinsically safe systems is limited to instrumentation, control and alarm systems because of the very low energy levels to which they are restricted.

ii) Explosion Proof / Flame Proof Equipment:

The equipment is designed with air gaps (‘flamepaths’), between covers or removable parts and the enclosure, closely controlled and so narrow that, if ignition occurred in the equipment, the resulting hot gases or flame would emerge at such velocities that surrounding flammable gas would not be ignited by the explosion. The concept is applicable to motors, junction boxes, circuit breakers and a wide range of other equipment. A certificate for the integrity of the equipment is issued after laboratory testing.

Care is essential in the maintenance and re-assembly of this type of equipment to ensure that the design features are not destroyed. In particular, the flame path should be kept dry and should never be filled with jointing compound.

General Precautions

Alarm or shutdown circuits which are working correctly should never be bypassed, overridden or isolated; such action could endanger the safety of the ship.

Defective circuits may be bypassed temporarily in case of an emergency but this action should only be taken with the full agreement of the responsible officer, and the decision should be recorded. The defect should be rectified and the circuit repaired as soon as possible, and the bypass removed.

Certified safe equipment should be carefully maintained, preferably by qualified personnel; advise from the manufacturer should be sought in case of doubt.

See more information on gas carrier operation:

Related Information:

Custody Transfer Measurement (CTM) System

Records of the calibration of key cargo instrumentation, including temperature and pressure gauges

The high level alarm system

Manifold arrangements

Safety equipment

Decontamination showers and an eye-wash

Cargo tank ruptures due to increased pressure - emergency procedure for gas carriers

Loss of power supplies - emergency actions

Risk and hazards of Equipment failure

Loss of Instrumentation during Unloading Operations - Recommended actions by Liquefied Gas carriers

Risk and hazards of Nitrogen Loss

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Gas carriers Structural Damage due to Incorrect Loading/Unloading Sequence

Encountering High Winds and/or Waves - countermeasures

Safety guideline for changing previous cargo

Safety checklist for gas carrier

LPG & Ammonia cargo handling -Precautions on cargo operation

The risk of ballast voyage - a brief guide to liquefied gas carriers

Preparatory operations for drydocking

Discussion prior to cargo transfer in liquefied gas carrier

Handling LPG And ammonia cargo - preparation for loading

The risk of discharging cargo - a brief outline to liquefied gas carriers

The risk of laden voyage - a brief guide to liquefied gas carriers

Connection and disconnection of cargo hoses and hard arms

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