Тест по Handling Nitrogen on Chemical tankers (CES v5.0)
Test results
The test consisted of 80 random questions.
Total questions on this topic: 93
Total questions on this topic: 93
Your result: 91%
Right answers:
1
Which of the following items must a vessel legally have on board prior to loading a cargo of Methyl Acrylate?
Your answer is correct:
A Certificate of Inhibitor.2
Symptoms of skin damage resulting from contact with liquid nitrogen may resemble which of the following conditions?
Your answer is correct:
Frostbite.3
Click on the boxes next to the terms, which describe the two methods of line clearing of a pipeline to a ship:
Your answer is correct:
Pigging.; Blow through.4
If during loading of liquid nitrogen, drops of the liquid are allowed to contact the steel deck, which of the following risks is created?
Your answer is correct:
Localised steel fracture.5
Dew point is defined by which of the following statements?
Your answer is correct:
The temperature at which a gas is saturated with respect to a condensable component.6
If a vessel has just loaded a solidifying or high-viscosity cargo, what procedure may routinely need to be implented?
Your answer is correct:
Additional line blowing.7
The maintenance of a nitrogen pad is also sometimes referred to as:
Your answer is correct:
Blanketing.8
Inert gases are all:
Your answer is correct:
Asphyxiates.9
During line clearing operations, which particular area is it critical, that ship’s personnel man throughout?
Your answer is correct:
The manifold.10
Two of the terms below indicate methods by which a pipeline may be cleared to a ship. Which are they?
Your answer is correct:
Pigging.; Blow through.11
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?
Your answer is correct:
Adequate space to accommodate the remaining product without exceeding maximum filling limits.12
Allowing for regional variations regular nitrogen cylinders are commonly:
Your answer is correct:
40-50 litres capacity at 180-200 bar pressure.13
The safest time to add nitrogen to a cargo tank is:
Your answer is correct:
Prior to loading.14
Putrefaction is a term applied to which of the following terms?
Your answer is correct:
The decomposition of vegetable oils.15
You have just completed loading 450 tonnes of Caustic Soda to two tanks on your vessel and will be trading to NW Europe with an ETA Rotterdam of December 6th. What would be a prudent operational measure to carry out?
Your answer is correct:
Additional line blowing.16
You have just loaded a cargo of Toluene. What particular hazard must you be aware of in terms of line clearing?
Your answer is correct:
Toluene is a static accumulator.17
Click on the boxes to indicate the possible purposes of additives:
Correct answer:
Stabiliser.; Antioxidant.; Inhibitor.Your Answer:
Coolant.; Stabiliser.; Antioxidant.; Inhibitor.18
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)?
Your answer is correct:
Gasolines and Light Gas Oils.19
Click on the boxes next to the two accepted methods of replacing the atmosphere in cargo tanks:
Your answer is correct:
Dilution.; Displacement.20
A tank structure may fail at as little as which of the following over-pressures?
Your answer is correct:
0,5 bar.21
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?
Your answer is correct:
Yes.22
Under normal circumstances, gas moves through a pipeline more easily than liquid. True or False?
Your answer is correct:
True.23
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)?
Your answer is correct:
15 minutes.24
If a cargo additive is oxygen dependent and prolonged blowing of a cargo hose with nitrogen takes place, what may happen?
Your answer is correct:
The efficiency of the additive may be significantly reduced.25
Which regulations indicate the requirements for the control of tank atmospheres in compartments containing chemicals?
Your answer is correct:
The IBC Code.26
Any operation involving nitrogen must be governed by an appreciation of:
Your answer is correct:
Rate of nitrogen flow in versus capacity of venting system out.27
In larger ports, nitrogen is commonly supplied to terminals by:
Your answer is correct:
Pipeline.28
Humid atmospheric conditions may cause a cargo tank to:
Your answer is correct:
Sweat.29
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:
Your answer is correct:
Supply valve / drain-cock / manifold valve.30
Nitrogen is frequently used in drying cargo tanks, but which other medium from the list below is commonly utilised in this task?
Your answer is correct:
De-humidified air.31
Click on the boxes next to the two main reasons behind the use of nitrogen on chemical tankers:
Your answer is correct:
Preserving cargo quality.; Preventing conditions under which a hazardous reaction might occur.32
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?
Your answer is correct:
Propylene Oxide.33
Click on the boxes to indicate the two types of shipboard nitrogen generator:
Your answer is correct:
Membrane separator.; Pressure-swing adsorption.34
In a closed-loading arrangement, if pressure is allowed to build in a tank which of the following will happen first?
Your answer is correct:
The pressure relief valve will lift.35
You are to receive cargo from rail cars. Which of the following risks should you be specifically aware of?
Your answer is correct:
As a tank car finishes, nitrogen may pass into the ship’s tanks, resulting in an overflow or structural damage if not controlled.36
Oil tankers use an inert atmosphere specifically to prevent:
Your answer is correct:
Fire or explosion in a tank containing a hydrocarbon gas/air mixture.37
The storage temperature of liquid nitrogen is approximately:
Your answer is correct:
-196 °C.38
Click on the boxes to indicate items of information that must appear on a Certificate of Inhibitor:
Your answer is correct:
The type or name of the inhibitor.; The date added and the effective duration.; The dependency of the additive.39
By injecting nitrogen into the shore pipeline during the loading process, which of the following advantages may be obtained?
Your answer is correct:
The requirement to pre-inert is much reduced.40
Which of the following items must a vessel legally have on board prior to loading a cargo of Styrene Monomer?
Your answer is correct:
A Certificate of Inhibitor.41
Click on the boxes to indicate the main types of nitrogen system, which may be encountered aboard a chemical tanker:
Your answer is correct:
Nitrogen generator.; Liquid nitrogen storage.; Nitrogen cylinder system.42
You are discharging vegetable oils to rail cars on shore. What additional precautions is it prudent to adopt?
Your answer is correct:
Blowing down of ship’s lines in the event of a protracted delay between groups of rail cars.43
What additional process can be applied to de-humidified air to make it more efficient in drying tanks?
Your answer is correct:
Heating.44
When maintaining a nitrogen pad on passage, a daily application will involve:
Your answer is correct:
Low pressure and low volume.45
What must the responsible officer ensure is available in a tank prior to a line clearing operation?
Your answer is correct:
Adequate space to accommodate the remaining product without exceeding maximum filling limits.46
The exhaust gas from a nitrogen generator exhaust outlet can typically contain which of the following oxygen levels?
Correct answer:
35-40 %.Your Answer:
Less than 10 %.47
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?
Correct answer:
Cascade purging.Your Answer:
Exhaust recycling.48
The term applied to the decomposition of vegetable oils is:
Your answer is correct:
Putrefaction.49
Which method of atmosphere replacement is generally practised on chemical tankers?
Correct answer:
Dilution.Your Answer:
Displacement.50
What colour identification strip is commonly used to mark nitrogen lines?
Correct answer:
Signal Yellow.Your Answer:
Powder blue with a 10 cm (4″) green stripe.51
The two parts of the rotating bed in a de-humidifier unit are referred to as:
Your answer is correct:
The process sector.; The reactivation sector.52
Which International Chamber of Shipping publication contains specific details on the use of nitrogen on chemical tankers?
Your answer is correct:
The Tanker Safety Guide – Chemicals.53
Which of the following is a true statement?
Your answer is correct:
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.54
Which regulations detail the requirements for the control of tank atmospheres in compartments containing chemicals?
Your answer is correct:
The IBC Code.55
Which of the following items are required to be indicated on a Certificate of Inhibitor?
Your answer is correct:
The type of inhibitor.; The date added and the effective duration.; The dependency of the additive.56
Inert gas drawn from an in-line unit in the main or auxiliary boiler exhaust, cannot normally be used in chemical tanker operations, because:
Your answer is correct:
It will be laden with hydrocarbons and soot particles, that would have a significant negative impact on the cargo quality.57
The term “Asphyxiates” is applied to:
Your answer is correct:
All inert gases.58
Indicate two types of liquid pad, which may be encountered in the carriage of certain specific liquid chemicals:
Correct answer:
Base oil.; Fresh water.Your Answer:
Base oil.; Liquid nitrogen.59
When purging a cargo tank with nitrogen, the critical relationship is:
Your answer is correct:
Rate of nitrogen flow in versus capacity of venting system out.60
Why is a hose cleared prior to disconnection? Click on the boxes next to the relevant reasons:
Your answer is correct:
Safety of personnel.; Pollution avoidance.61
Should unbroken blisters resulting from a steam burn be left intact?
Your answer is correct:
Yes.62
Purging is defined by which of the following statements?
Your answer is correct:
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.63
Regular nitrogen cylinders are:
Your answer is correct:
40-50 litres capacity at 180-200 bar pressure.64
What possible source of contamination might be encountered if steam is used during tank cleaning?
Your answer is correct:
Boiler treatment chemicals.65
Identify the correct relationship for rail car safety and operating settings on US tanks cars from the list below:
Correct answer:
Safety valve: 5,2 bar, maximum operating pressure: 4,1 bar.Your Answer:
Safety valve: 4,1 bar, maximum operating pressure: 5,2 bar.66
If a ship enters a channel, where the water is relatively cold and still, what may occur in the cargo tanks?
Your answer is correct:
Sweating of the bulkheads.67
A supply through a 100 mm (4″) line, delivered at 5,2 bar (75 psi), can introduce which of the following volumes of nitrogen?
Your answer is correct:
343 cubic meters/min.68
Approximately how much nitrogen is there in the air we breathe?
Your answer is correct:
80 %.69
Click in the boxes next to mediums commonly used in drying cargo tanks:
Your answer is correct:
Nitrogen.; De-humidified air.70
What additional precautions may have to be taken when discharging vegetable oils to rail cars on shore?
Your answer is correct:
An air or nitrogen supply to hand at the ship’s manifold, for use in line clearing in the event of protracted delays due to shifting and repositioning of rail cars.71
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?
Your answer is correct:
2 %.72
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?
Your answer is correct:
True.73
Entering unprotected into an inerted space can lead to unconsciousness in as little as:
Your answer is correct:
20 seconds.74
What should be reached before commencing any operation involving nitrogen?
Your answer is correct:
The full agreement on and understanding of all aspects of the operation by all parties involved.75
What is “dew point”?
Your answer is correct:
The temperature at which a gas is saturated with respect to a condensable component.76
Click on the boxes next the correct reasons for cleaning a hose prior to disconnection:
Your answer is correct:
Safety of personnel.; Pollution avoidance.77
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?
Your answer is correct:
3 000 cubic meters.78
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?
Your answer is correct:
De-humidified air.79
Nitrogen from cylinders will need to pass through which of the following for safe use on deck?
Your answer is correct:
A reduction valve.80