Posts Tagged ‘cargo’

Radio Surveys and Radio Safety Certificates

The radio equipment must satisfy the provisions stipulated in the Radio Regulations, and be in accordance with the radio licence.
All cargo and passenger ships obliged to be fitted with radio stations in accordance with the SOLAS Convention must have a CARGO SHIP SAFETY RADIO CERTIFICATE.
The certificate is normally valid for maximum one year from the [...]

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Instrinsically safe (i.s) equipment:

Instrinsically safe (i.s) equipment:

Zener barriers are frequently used and in the circuit shown the voltage is limited by the Zener diodes, and the maximum current flow to the hazardous area is restricted by the resistors
The use of intrinsically safe systems are normally limited to instrumentation and control circuitry in hazardous areas

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Reliquefaction Systems and Control of Boil off

Methods of controlling vapour pressure in cargo tanks:-

Leading cargo boil-off to ship’s boiler, gas turbine or main engine, to be used as fuel
Leading cargo boil-off to ship’s reliquefaction plant, where the vapour is liquefied
Cooling the liquid cargo in a heat exchanger or by cooling the shell of the cargo tank

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Unloading of Liquefied Gas

Normally done by one, or a combination, of the following methods;

A submerged centrifugal pump
A submerged centrifugal pump and a booster pump

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Heat Exchanger

Different types: TUBE HEAT EXCHANGER

Produce with tube bundles placed into a chamber

tube OD = 10 to 20 mm
stainless steel, carbon steel, copper-nickel alloy, aluminium-brass alloy or titan

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