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Tankers 1 essays
Terms in this set (7)
Advantages of double hulls
Decrease in potential of pollution incidents, easier tank cleaning, concurrent cargo and ballast operations, complies with regulatory requirements
Disadvantages of double hull
Accelerated corrosion rates, high stress areas (cracks), construction, and maintenance costs.
What does purging and gas freeing mean
Purging- pumping tanks w/ inert gas, continue until hydrocarbon rate is at 2% or less. hydrocarbon concentration to a point that fresh air ventilation will not result in creation of flammable atmosphere.Ventilation continues until the atmosphere in a tank is 21% oxygen and less than 1% LEL
Gas freeing- fresh air is delivered to tank, container is diluted w/ air; mixing with vapors in the tank. Hydrocarbons expelled from a tank reduce over time and at some point decrease below the lower flammable limit•Until this occurs, there is a potential danger of fire and explosion if the flammable zone reaches a source of ignition
Explain how to tighten a flange without using the word alternating.
You start in one place and then go across from it, making a star pattern, or how you would tighten a car tire
What is a crossover aboard an oil tanker
Crossover pipe is used because there are different cargo systems or segregation onboard tankers. Crossover pipes are used to cross over between the systems. A crossover can be a fixed hard piping (mix master), or temporary fixed run arounds, or jumper hoses which are usually rubber
PV valve operations and it's location
Pressure vaccum valences are used to maintain a safe pressure within a cargo tank. If pressure were to increase pass a preset pressure, the valve will release internal gasses, likewise for if the tank becomes vaccumed , on deck, at a safe height.
Radar Gauging System
-radar pulses emitted from an antenna at the top of the tank
-sends frequency that bounces off liquid & back 2 antenna to measure distance.
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