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家 在线测试 CES Chemical tanker MASTER / Ch-Officer Test about Handling Nitrogen onboard Chemical Tankers (CES)
在线测试： Test about Handling Nitrogen onboard Chemical Tankers (CES)
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该测试由 80 个随机问题组成。
有关此主题的总问题： 93
有关此主题的总问题： 93
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The two parts of the rotating bed in a de-humidifier unit are referred to as:
The process sector.
The primary sector.
The redistribution sector.
The reactivation sector.
回答
Which of the following statements is an accepted definition of purging?
Pre-drying.
The filling of a cargo tank and associated piping systems, or the spaces surrounding a cargo tank, with a saturated gas or latent vapour, which will not induce hydrolysis, and maintaining that condition.
The filling of a cargo tank and associated piping systems, or the spaces surrounding a cargo tank, with a gas or vapour, which will not support combustion and which will not react with the cargo, and maintaining that condition.
The gas-freeing of a cargo tank, to a level at which the hydrogen sulphide content, as measured, is less than 35 ppm.
Inert gases are all:
Aspirates.
Asynchronites.
Propyloxyphenes.
Asphyxiates.
Under normal circumstances, gas moves through a pipeline more easily than liquid. True or False?
True.
False.
Which of the following risks may be deemed to exist with a direct transfer from rail cars to a ship?
Once the maximum operating pressure is achieved in the rail car, its safety valves will lift.
As a tank car finishes, nitrogen may pass into the ship’s tanks, resulting in an overflow or structural damage if not controlled.
As a tank car commences, the ship’s tank will be over-pressured and structural damage will result.
The pressure build-up in the ship’s tank may result in a reduced discharge rate from the rail cars.
Any operation involving nitrogen must be governed by an appreciation of:
Tank capacity measured against nitrogen supply rate.
Liquid flow in versus liquid flow out.
Rate of nitrogen supply measured against cargo pump capacity.
Rate of nitrogen flow in versus capacity of venting system out.
Click on the boxes next to the terms, which describe the two methods of line clearing of a pipeline to a ship:
Blow down.
Pigging.
Blow through.
Filling.
回答
During line clearing operations, which particular area is it critical, that ship’s personnel man throughout?
Adjacent to the VHF radio.
The gangway.
Fore and aft.
The manifold.
Putrefaction is a term applied to which of the following terms?
The dissolution of Caustic Soda.
The blanketing of low-flash cargoes.
The decomposition of vegetable oils.
The pyrolyzation of light refraction oils.
Which of the following items must a vessel legally have on board prior to loading a cargo of Methyl Acrylate?
A Certificate of Purify.
A Certificate of Analysis.
A Certificate of Test.
A Certificate of Inhibitor.
Click on the boxes to indicate the two types of shipboard nitrogen generator:
Membrane separator.
Pressure separator.
Comparative isolator.
Pressure-swing adsorption.
回答
The maintenance of a nitrogen pad is also sometimes referred to as:
Purging.
Blowing.
Blanketing.
Blending.
The MARPOL 73/78 regulations require chemical tankers of 30 000 dwt and over to inert all cargo tanks containing petroleum products with a flash point of 60 °C and less. True or False?
True.
False.
Which of the following items must a vessel legally have on board prior to loading a cargo of Styrene Monomer?
A Certificate of Purify.
A Certificate of Analysis.
A Certificate of Test.
A Certificate of Inhibitor.
The term applied to the decomposition of vegetable oils is:
Putrefaction.
Distillation.
Pyrolyzation.
Reactivation.
Should unbroken blisters resulting from a steam burn be left intact?
Yes.
No.
Why is a hose cleared prior to disconnection? Click on the boxes next to the relevant reasons:
Compliance with SOLAS regulations.
Safety of personnel.
Pollution avoidance.
Ship’s personnel cannot undertake these tasks as per company regulations.
回答
Entering unprotected into an inerted space can lead to unconsciousness in as little as:
20 seconds.
45 seconds.
1 minute.
2 minutes.
Oil tankers use an inert atmosphere specifically to prevent:
Corrosion of the tank surfaces.
Fire or explosion in a tank containing a hydrocarbon gas/air mixture.
Loss of cargo quantity during a loaded passage.
Reduction of cargo quality during a loaded passage.
What precautions should be taken after loading an inhibited cargo, where the shore then cleared the line to the ship using nitrogen?
Ensure maintenance of the nitrogen blanket throughout the voyage.
If not already known, request confirmation of the purity level of nitrogen required for maintaining the nitrogen blanket during the voyage from the Ship Operator.
To prevent the possibility of condensation forming in the line system, ensure that the pump stack and manifold valves are immediately closed and kept closed during the entire voyage.
Ensure sufficient oxygen is introduced into the cargo line and pump stack as soon as practicable after completion of loading, in order to avoid subsequent valve seizure as a result of polymerized product.
Unconsciousness resulting from entering into an inerted space without breathing apparatus can occur earliest in which of the following times?
2 minutes.
1 minute.
45 seconds.
20 seconds.
Which regulations detail the requirements for the control of tank atmospheres in compartments containing chemicals?
The ICS Tanker Safety Guide (Chemicals).
SOLAS 1974.
The IBC Code.
ISGOTT.
Approximately how long will it take to deliver 5 000 cubic meters of nitrogen gas through a 100 mm (4″) pipeline at 5,2 bar (75 psi)?
30 minutes.
45 minutes.
15 minutes.
60 minutes.
What must the responsible officer ensure is available in a tank prior to a line clearing operation?
An inert atmosphere.
Adequate pressure to ensure good flow in the vapour return system.
Adequate space to accommodate the remaining product without exceeding maximum filling limits.
Independent portable ullaging equipment.
To obtain around 2 % oxygen content in a cargo tank by the dilution method, approximately how many volume changes of pure nitrogen will need to be injected:
1,3.
2,1.
3,5.
4,5.
You are the officer on watch and are about to undertake a line clearing operation from shore. What must you ensure is available in the required tank?
Independent portable ullaging equipment.
An inert atmosphere.
Adequate pressure to ensure good flow in the vapour return system.
Adequate space to accommodate the remaining product without exceeding maximum filling limits.
A supply through a 100 mm (4″) line, delivered at 5,2 bar (75 psi), can introduce which of the following volumes of nitrogen?
27 cubic meters/min.
47 cubic meters/min.
343 cubic meters/min.
87 cubic meters/min.
Nitrogen from cylinders will need to pass through which of the following for safe use on deck?
A reactivation valve.
A cooler.
A de-humidified unit.
A reduction valve.
What colour identification strip is commonly used to mark nitrogen lines?
Signal Red.
International orange.
Signal Yellow.
Powder blue with a 10 cm (4″) green stripe.
Click on the boxes to indicate the possible purposes of additives:
Coolant.
Stabiliser.
Antioxidant.
Inhibitor.
回答
What size of cargo tank would cause special inerting requirements (as listed under the 2 000 Amendments to the SOLAS 1974 Protocol) to be implemented on a chemical tanker carrying low-flash products?
5 000 cubic meters.
3 000 cubic meters.
2 000 cubic meters.
1 000 cubic meters.
What term is applied to the discharge of rail cars by the application nitrogen?
Pushing off.
Pressing off.
Pulling off.
Putting off.
You are to receive cargo from rail cars. Which of the following risks should you be specifically aware of?
Once the maximum operating pressure is achieved in the rail car, its safety valves will lift.
As a tank car finishes, nitrogen may pass into the ship’s tanks, resulting in an overflow or structural damage if not controlled.
As a tank car commences, the ship’s tank will be over-pressured and structural damage will result.
The pressure build-up in the ship’s tank may result in a reduced discharge rate from the rail cars.
Assuming the vessel is fitted with the appropriate equipment, which of the following mediums is employed in drying cargo tanks, as an alternative to nitrogen?
Compressed air.
Condensed air.
De-humidified air.
De-natured air.
A tank structure may fail at as little as which of the following over-pressures?
0,1 bar.
0,5 bar.
2 bar.
3 bar.
Which method of atmosphere replacement is generally practised on chemical tankers?
Dislocation.
Dilution.
Dissolution.
Displacement.
Which of the following chemicals has an inhibitor added for marine transportation?
Iso-propyl alcohol.
Ethyl acrylate.
Caustic soda solution.
Sulphuric acid.
Which of the following is a true statement?
Extended blowing of a cargo hose will lead to the destabilisation of an additive.
Polymerization will result from prolonged blowing of a cargo hose with air.
The specification of a colour sensitive cargo will be adversely affected if the cargo hose is blown with nitrogen after discharge.
Prolonged blowing of the cargo hose used for loading a cargo containing an oxygen-dependant additive with nitrogen may lead to a significant drop in the efficiency of that additive.
Which of the following items are required to be indicated on a Certificate of Inhibitor?
The type of inhibitor.
The date added and the effective duration.
The manufacturer of the additive.
The dependency of the additive.
回答
By injecting nitrogen into the shore pipeline during the loading process, which of the following advantages may be obtained?
The requirement to pre-inert is much reduced.
The need to pre-inert is avoided entirely.
The need to monitor nitrogen levels after loading is eliminated.
Loading can take place at a higher rate.
If a cargo additive is oxygen dependent and prolonged blowing of a cargo hose with nitrogen takes place, what may happen?
The efficiency of the additive will be increased.
The efficiency of the additive may be significantly reduced.
Immediate polymerization will occur around the cargo pump.
The colour of the cargo will be affected.
Click on the boxes to indicate the main types of nitrogen system, which may be encountered aboard a chemical tanker:
Nitrogen generator.
Oil-fired inert gas generator.
Liquid nitrogen storage.
Nitrogen cylinder system.
回答
In larger ports, nitrogen is commonly supplied to terminals by:
Truck.
Pipeline.
Cylinders.
Barges.
The traditional manual dew point meter employs which of the following substances?
Methanol.
Acetone.
Toluene.
Dry ice.
回答
Nitrogen is frequently used in drying cargo tanks, but which other medium from the list below is commonly utilised in this task?
Cooled air.
Compressed air.
De-humidified air.
Deodorized air.
Inert gas drawn from an in-line unit in the main or auxiliary boiler exhaust, cannot normally be used in chemical tanker operations, because:
The gas will be above the LEL.
SOLAS requires this type of generator to be fitted only on oil tankers.
It will be laden with hydrocarbons and soot particles, that would have a significant negative impact on the cargo quality.
MARPOL Annex II prohibits tank washing direct to sea after inerting with such gases.
What is “dew point”?
The temperature at which a gas is saturated with respect to a condensable component.
The temperature at which a condensable component is saturated with respect to a gas.
The temperature at which a saturated gas becomes in ambient.
The temperature at which dry-ice melts in acetone.
The safest time to add nitrogen to a cargo tank is:
Immediately after loading.
Prior to loading.
As the cargo is being loaded.
As the vessel approaches the discharge port.
Identify the correct relationship for rail car safety and operating settings on US tanks cars from the list below:
Safety valve: 12 bar, maximum operating pressure: 8 bar.
Safety valve: 5,2 bar, maximum operating pressure: 4,1 bar.
Safety valve: 4,1 bar, maximum operating pressure: 5,2 bar.
Safety valve: 8 bar, maximum operating pressure: 5 bar.
Which regulations indicate the requirements for the control of tank atmospheres in compartments containing chemicals?
The ICS Tanker Safety Guide (Chemicals).
SOLAS 1974.
The IBC Code.
ISGOTT.
Which International Chamber of Shipping publication contains specific details on the use of nitrogen on chemical tankers?
Inert Gas System.
SOLAS 1974.
The Nitrogen Handling Manual.
The Tanker Safety Guide – Chemicals.
The exhaust gas from a nitrogen generator exhaust outlet can typically contain which of the following oxygen levels?
In excess of 60 %.
35-40 %.
20,9 %.
Less than 10 %.
Indicate two types of liquid pad, which may be encountered in the carriage of certain specific liquid chemicals:
Base oil.
Fresh water.
Sulphuric acid.
Liquid nitrogen.
回答
Allowing for regional variations regular nitrogen cylinders are commonly:
70-75 litres capacity at 125-130 bar pressure.
200 litres at 50 bar pressure.
100 litres capacity at 175-200 bar pressure.
40-50 litres capacity at 180-200 bar pressure.
De-humidified air can be made more efficient for drying tanks by:
Cooling.
Heating.
Filtering.
Pressurizing.
The term “Asphyxiates” is applied to:
All oxygen dependent inhibitors.
Inerting techniques on chemical tankers.
All inert gases.
All cargoes with a high evaporation rate.
In a closed-loading arrangement, if pressure is allowed to build in a tank which of the following will happen first?
The tank structure will fail.
The high-level alarm will activate.
The shore pump will stop.
The pressure relief valve will lift.
Humid atmospheric conditions may cause a cargo tank to:
Tolerate.
Steam.
Evaporate.
Sweat.
When purging a cargo tank with nitrogen, the critical relationship is:
Tank capacity measured against nitrogen supply rate.
Liquid flow in versus liquid flow out.
Rate of nitrogen supply measured against cargo pump capacity.
Rate of nitrogen flow in versus capacity of venting system out.
If an amount of nitrogen equivalent to 3,5 times the volume of a cargo tank was injected into that space (by dilution), what level of oxygen might it be reasonable to expect at that time?
5 %.
1 %.
8 %.
2 %.
If a ship enters a channel, where the water is relatively cold and still, what may occur in the cargo tanks?
Desorption in the upper area of the wing tanks.
Steam emission.
Evaporation on the bulkheads.
Sweating of the bulkheads.
Under normal circumstances, which moves through a pipeline more easily?
Liquid.
Gas.
The illustration shows a compressed air supply rigged to blow a pipeline. Click on the correct sequence to ensure no back-flow of product occurs when commencing blowing the line:
Supply valve / drain-cock / manifold valve.
Supply valve / manifold valve / drain-cock.
Drain-cock / manifold valve / supply valve.
Manifold valve / drain-cock / supply valve.
You have just loaded a cargo of Toluene. What particular hazard must you be aware of in terms of line clearing?
Toluene has a high melting point.
Toluene is a static accumulator.
Toluene needs to be blanketed.
Toluene is a high viscosity cargo.
Click on the boxes next the correct reasons for cleaning a hose prior to disconnection:
Safety of personnel.
Ship’s personnel cannot undertake these tasks as per company regulations.
Pollution avoidance.
Compliance with SOLAS regulations.
回答
Click on the boxes to indicate which of the following are among the items indicated on the tank entry permit?
Minimum permitted oxygen level required for entry.
Minimum hydrogen sulphide level required for entry.
Observed gas concentration values for tanks, which previously contained toxic cargoes.
Validity of the permit.
回答
What is the term applied to the technique of recycling the exhaust atmosphere during a purging operation, using it to commence purging down in a second compartment?
Consolidation inerting.
Cascade purging.
Collection inerting.
Exhaust recycling.
The storage temperature of liquid nitrogen is approximately:
-42 °C.
196 °C.
-196 °C.
-96 °C.
If a chemical tanker has tank-cleaning machines with a nozzle throughput of more than 17,5 cubic meters per hour, is it subject to inerting requirements in cargo tanks containing low-flash products?
Yes.
No.
Click on the boxes next to the two main reasons behind the use of nitrogen on chemical tankers:
Preserving cargo quantity.
Preserving cargo quality.
Nitrogen is cheaper to produce than other mediums.
Preventing conditions under which a hazardous reaction might occur.
回答
Purging is defined by which of the following statements?
The filling of a cargo tank and associated piping systems, or the spaces surrounding a cargo tank, with a saturated gas or vapour which will not support condensation and which will not react specifically with the cargo, and maintaining that condition.
The filling of a cargo tank and associated piping systems, or the spaces surrounding a cargo tank, with a gas or vapour, which will not support combustion and which will not react with the cargo and maintaining that condition.
Gas bubbling through a cargo, as happens during hose blowing, is particularly hazardous with which category of cargoes?
Acids.
Inorganic chlorides.
Water-sensitive products.
Static accumulator cargoes.
Which of the following cargoes is an example of one loaded in a tank, where the surrounding empty voids and ballast tanks will also be inerted?
Propylene Glycol.
Propylene Oxide.
Propyl Ether.
Propylamine.
Click on the boxes to indicate items of information that must appear on a Certificate of Inhibitor:
The type or name of the inhibitor.
The date added and the effective duration.
The manufacturer of the additive.
The dependency of the additive.
回答
What possible source of contamination might be encountered if steam is used during tank cleaning?
Residual chemicals.
Boiler treatment chemicals.
Organic chemicals.
Compressed chemicals.
Two of the terms below indicate methods by which a pipeline may be cleared to a ship. Which are they?
Filling.
Blow down.
Pigging.
Blow through.
回答
You are discharging vegetable oils to rail cars on shore. What additional precautions is it prudent to adopt?
Keeping a fresh water supply adjacent to the shore gantry to wash down any spillage.
Positioning extra personnel on the ship’s manifold to ensure continuous communication.
Blowing down of ship’s lines in the event of a protracted delay between groups of rail cars.
Drawing up written procedures to cover the discharge and have them signed by a shore representative prior to commencement of discharge.
Symptoms of skin damage resulting from contact with liquid nitrogen may resemble which of the following conditions?
Melanoma.
Dengue fever.
Frostbite.
Alaplecia.
Chemicals tankers operating predominantly in which of the following trades routinely use oil-fired inert gas (assuming they are fitted with the appropriate generating equipment)?
Acids.
Heavy Oils.
Propylene Oxide.
Gasolines and Light Gas Oils.
What additional process can be applied to de-humidified air to make it more efficient in drying tanks?
Cooling.
Heating.
Filtering.
Depressurizing.
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