家在线测试 CES Oil tanker Deck Support Test online CES 5.1 for Deck department, Support level, Oil tanker vessel

在线测试： Test online CES 5.1 for Deck department, Support level, Oil tanker vessel

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该测试由有关选定主题的随机问题组成。

问题 1 从 90

According to their physical state, extinguishing agents may be classified:

Synthetic, proteinic, gases and liquid

Proteinic and synthetic

Solid, proteinic and gases

Solid, liquid and gases

The duty engineer of a UMS ship is approached by a member of the ship's staff, seeking permission to hang wet working clothes in the engine room to dry. Should he:

Allow the clothes to be hung over a rail provided there is no electrical equipment directly below

Allow the clothes to be hung over rail next to the warm F.O. service tanks

Allow the clothes to be hung over a rail anywhere

Not allow the clothes to be hung anywhere in the unmanned machinery spaces

What data is at least requested in a DSC “distress alert” ?

the identification of the vessel in distress and her position

Don't know

the identification of the vessel in distress and the number of people on board

the identification of the vessel in distress, her position and the nature of distress

Considering the range of sensitive liquid chemicals which routinely require wall-wash prior to loading, what product is mainly used as the rinsing agent in wall-washing?

Water.

Iso-propanol.

Industrial Ethanol.

Methanol.

Your vessel is to turn in a narrow canal by use of one tug (turn to port with the bow). In which position and how would you use the tug? (Vessels engine will also be used).

Make the tug fast aft for pulling

Make the tug fast on port shoulder to pull

Make the tug fast in centre bow fairlead for pulling

Make the tug fast on starboard shoulder to push

A ship is equipped with a right-handed fixed pitch propeller, which when going from Full Ahead to Full Astern will make the ship sheer to starboard. Can anything be done to reduce this change in heading?

The rudder should be kept amidships when going astern and there is little that can be done to reduce the swing to starboard

The rudder can be put from side to side in a "Rudder Cycling" movement.

The rudder can be put to Hard to Port to reduce the water flow to the right side of the propeller

The rudder should be put Hard to Port to reduce the water flow to the left side of the propeller

Your engine is going astern and you pick up sternway. The rudder is midships, and you are operating on a single, right-handed fixed screw. How will your ship react?

She will most likely change heading to starboard

She will most likely go straight astern

She will most likely change heading to port

The stern will be lifted to starboard

Which electronic component does this graphical symbol represent?

Diode

Transistor

Silicon controlled rectifier

Tunnel diode

What is meant by the atmosphere in a cargo tank being "too rich" or "too lean"?

The atmosphere will not support combustion in either situation.

The atmosphere supports combustion iif it is "too lean" but does not do so if it is "too rich".

The atmosphere supports combustion if it is "too rich" but does not do so if it is "too lean".

The atmosphere supports combustion in both situations.

"A contractor is hired to install new navigation equipment onboard your ship while it’s berthed. For a period of time he’s left unsupervised and photographs schematics of the ship that he finds rolled up and stored in the corner of a nearby office. Later, from home, he hacks into the network and prints off information about the ship’s security procedures. Which of these information security measures would have prevented his unauthorized access?"

"Protective markings, reference checks, and passwords."

"Secure area, passwords, a firewall and a secure network."

"Firewall, protective markings, vetting and a secure network."

"Secure area, passwords, a firewall and protective markings."

Which of the following is a chemical commonly added to cleaning substances used to clean galley areas?

Bleach.

Beach.

Blanch.

Breach.

You have just been handed six sample bottles by the cargo surveyor, containing Nitric Acid drawn from a cargo just loaded on your ship. How will you move them to the sample locker, prior to storage?

I will carry as many as I can in my arms in one go, but ensure first that I put on a pair of chemical-proof gloves.

I will instruct the cargo surveyor that he must deliver the samples to the locker himself.

I will obtain a plastic carrier bag, put the bottles inside and take them to the locker as quickly as possible.

I will place them into a proper container with a handle, such as a sample carrier or a strong bucket. When I move them, I will ensure that I am focused on this task alone.

What nominal filling restriction exists under the IBC Code for a single tank on a type 3 chemical tanker? (Not counting structural, capacity or cargo specific limitations).

3000 cubic metres.

1750 cubic metres.

There is no filling restriction for a type 3 chemical tanker.

1250 cubic metres.

The data logger on a reefer vessel normally records temperatures for air delivery, air return and cargo pulp. How would the air delivery and return temperatures be expected to vary during the first few days of carrying a cargo of citrus fruit which had not been pre-cooled before loading?

The difference between the two temperatures would steadily increase.

The difference between the two temperatures would remain constant.

The two temperatures would remain constant

The difference between the two temperatures would steadily reduce.

On the diagram provided, there are four (4) possible directions indicating the term "AHEAD". Which one is the correct?

Ahead is given by A on the figure

Ahead is given by D on the figure

Ahead is given by B on the figure

Ahead is given by C on the figure

Sounding pipes in the engine room are normally fitted with deadweight cocks and screw caps. Which of the following statements is correct?

Caps and cocks should be closed at all times, except when sounding tanks, to prevent ingress of water or oil into the engine room in case of tank bottom damage or overflow.

Deadweight cocks should be fastened in the open position to save time when sounding the tanks.

It does not matter where the cocks/caps are unless the tank is in use.

Caps should be placed on top of sounding pipes to keep the engine room tidy.

Under which of the following conditions would it be dangerous to load a cargo of bulk coal?

When the temperature of the coal to be loaded exceeds 55 degrees Celsius

When the temperature of the coal to be loaded exceeds 30 degrees Celsius

When loading is required from open stockpiles

When loading coal from an open stockpile and it is wet

Pasta is often referred to as "al dente". What does this mean?

Coated with oil before boiling.

Part cooked.

Tender, but slightly firm to the bite.

Served separately from other ingredients.

Does a joint of meat that has been filled with a stuffing mixture take longer or shorter to cook? (Select the most correct answer).

It makes no difference - they will take the same time to cook.

Shorter.

It depends on the amount of stock or other liquid added to the stuffing mixture.

Longer.

Pump rooms on oil tankers shall be provided with a fixed fire-extinguishing system. Which of the following systems is in accordance with present regulations? (SOLAS II-2/63)

Fixed pressure water spraying system

Fixed high expansion foam system

Fixed CO2 fire-extinguisher system

Fixed powder fire-extinguishing system

The chemical abbreviation "H2S" is often associated with Crude Oil cargoes. What does the abbreviation stand for?

Hydrogen Sour.

Hydrogen Separation - 2nd distillation stage.

Hydrogen Sulphide.

Halogenated Sulphide.

What initial simple action can be taken to reduce the oxygen content of boiler water?

Increase the blowdown.

Increase the boiler pressure.

Raise the feed water temperature.

Lower the feed water temperature.

What name is given to the rotating jet water outlets on a tank-cleaning machine that is used on an oil tanker?

Distributors.

Nozzles.

Turbines.

Ejectors.

What would result from contact with liquid ammonia?

Unconciousness

Loss of memory

Death

Loss of eyesight

To allow efficient pumping of aromatic Crude Oil cargoes, they are usually heated to reduce their viscosity. What is the ideal maximum viscosity that is normally achieved for this purpose?

250 cSt (250 mm2/s)

450 cSt (450 mm2/s)

45 cSt (45 mm2/s)

1,250 cSt (1,250 mm2/s)

Apart from temperature there are few differences between carrying cargoes of chilled meat, minus 1 degree Celsius, and frozen meat, minus 18 degrees Celsius. A key difference is that for frozen meat the cooling fans are operated at half speed or some are switched off whereas for chilled meat the fans are run constantly at full speed. Select, from the options given, the main reason for this difference in fan operation.

It is an energy saving measure since chilled meat cargoes do not require as much cold air.

The chilled meat is more sensitive to damage and therefore tighter temperature control is necessary.

The fans may be damaged if they were run at full speed delivering very cold air to the frozen cargo.

Running the fans at full speed would generate too much heat which may affect the frozen meat.

Cargo holds on a bulk carrier are washed after discharge, but cargo residues are often found on the tank top when hatches are opened at the load port. What could be the likely cause?

Holds were not inspected thoroughly after cleaning

Due to failure of the bilge eductors

Because of cargo residues falling down due to ship's vibrations during the ballast passage

Because of poor drainage into the bilges

The figure shows a silicon controlled rectifier with a RC circuit connected in parallel. RC circuit is often used in such connection. For which purpose?

Protect the SCR against damage caused by high voltage spikes

Obtain current resonance

Measuring the current through the SCR

Delay the ignition of the SCR

What medium is used to calibrate the ODME?

Fresh water.

Gasoline.

Sea water.

Crude oil.

Many large 2 stroke marine diesel engines are equipped with an auxiliary scavenge air blower. What is the purpose of this equipment?

To provide combustion air at start up, during manouevring and low load running when the turbocharger delivery is insufficient.

To assist the main turbochargers in supplying combustion air when on full load.

To help cool the engine after it has been stopped.

To allow full load running when the main turbocharger is defective..

One or more pressure/vacuum-breaking devices shall be provided on the vent mains to prevent the cargo tanks from being subject to a positive and negative pressure. What is the normal pre-set point for negative pressure?

A negative pressure in excess of 500 mm water gauge.

A negative pressure in excess of 200 mm water gauge.

Depending on the test pressure of the cargo tank.

A negative pressure in excess of 700 mm water gauge.

When preparing a cargo tank on a liquefied gas carrier for loading cargo following inspection of the tank a number of different steps are required. What is the first step required after such an inspection?

Inerting.

Drying.

Gassing up.

Cooling down.

Mention three ways of adjusting a centrifugal pump’s delivery capacity.

Throttling the delivery valve, throttling the suction valve, reduce the steam consumption.

Only throttling the suction valve.

Throttling the delivery valve, adjust the RPM, by-pass.

Throttling the suction valve, reduce the steam consumption, by-pass.

On a Container vessel, when will a full container experience a force of 100% of its weight?

When the ship is heaving

When the ship is rolling and pitching

When the ship is rolling

When the ship is pitching

You must not attempt to move a casualty carelessly, if you suspect patient with:

Fractured spine

Sleeping

Consumed excess alcohol

Unconscious

Why are the L.P.G. compressors of "Oil Free" type design?

To prevent contamination of the cargo.

To prevent low oil pressure during start up.

To prevent carbonising of the valves.

To prevent contamination of the lub oil.

Polymerisation may be a problem with some liquefied gas cargoes such as vinyl chloride and ethylene oxide. What is the definition of polymerisation?

Polymerisation is when liquids cool down and become more viscous.

Polymerisation is when single molecules of the same compound join together to form a new compound usually with a higher viscosity.

Polymerisation is when the molecules of a compound split and form a new compound.

Polymerisation is when molecules of two or more different compounds join together to form a new compound.

What is the purpose of Material Safety Data Sheets?

To provide all personnel including emergency personnel with procedures for handling or working with that substance in a safe manner

To provide personnel in deck- and engine department with procedures for handling or working with that substance in a safe manner

To provide the safety officer with procedures for handling or working with that substance in a safe manner

To determine if the substance is flammable or not

What weakens a turnbuckle?

Pitting

A bent locking nut

A fully extended spindle

Lack of grease

When would the Chief Officer wish to consult the First Engineer?

The Chief Officer would wish to consult the First Engineer whenever a hydraulic tank need to be filled.

The Chief Officer would wish to consult the First Engineer on all matters related to pollution.

The Chief Officer would wish to consult the First Engineer when the cargo hold bilges are not emptying, despite the bilges being pumped out.

The Chief Officer would wish to consult the First Engineer when items of engine room machinery require maintenance.

Which of the options represents the best action to take when an item of machinery, which normally operates in automatic mode, is operated in 'manual' mode?

Have someone permanently stationed at the machine in case of an operational problem.

Keep the Chief Engineer informed of machines performance on an hourly basis.

Change over all other machinery to manual mode of operation.

Monitor the operation of the machinery on a frequent basis.

Indicate the correct name for the part marked on the sketch:

Rocker

Main bearing

Push rod

Connecting rod

What is the difference between the protection supervisor's and the protection and environment committee's area of activity?

The supervisor's duties relate to the ratings, the commitee's to all seafarers

The commitee is supervised by the protection supervisor

The supervisor's field is the work situation, the commitee's the total environment, also spare time

No difference

Under international regulations where must entries be made with regard to the disposal of cargo residues into the sea?

In the Deck log book

In the Official log book

In the Garbage record book

In the Cargo record book

The temperature of chilled air is monitored after it has passed through a refrigerated cargo and the temperature noted. This temperature is often referred to as the RAT. Which of the given options does RAT stand for in relation to refrigeration of a cargo?

Return Air Temperature.

Respirated Air Temperature.

Relative Air Temperature.

Reduced Air Temperature.

During inspection of the crank bearing for one of the units in the main engine, the bearing shell was found as follows: Surface of the white metal was black and very hard. Patches of black incrustations have worn grooves in the journal. What was the cause?

Water in the lubricating oil during service

Wrong casting of bearing shell

Dirt in the lubricating oil

Bearing shell service time exceeded.

On a General Cargo Vessel, under what regulations would steel bands remaining in the cargo holds have to be discharged?

MARPOL 73/78 (Annex IV - Regulations for the prevention of pollution by sewage from ships)

MARPOL 73/78 (Annex V ? Regulations for the prevention of pollution by garbage from ships)

Flag state regulations

No specific regulations apply

When using a PID controller, which of the following parameter settings will not result in oscillation?

Temperature change

Too long D-time

Too high amplification

Too long I-time

Where does the excess steam discharge to when the boiler safety valves operate due to the boiler pressure being too high.

The main condenser

The engineroom bilges

The auxiliary condenser

The atmosphere via the atmospheric line

Measurement of oil cargoes is often achieved with a "UTI" device. What do the letters "UTI" stand for?

Uniform Tank Indicator.

Uncorrected Tank Innage.

Ullage Topping Instrument.

Ullage Temperature Interface.

Use Kirchoff's voltage law and Ohm's law to calculate the voltage V(2) across the resistance R(2).

0,75 V

2 V

4,5 V

6 V

The engine room rating has been assisting with ballast operations during a period of engine room watch duty. Ballast operations have stopped for a couple of hours while stores are being taken. What action should the rating take during this break in operations?

Just keep the pumps running and the valves for the ballast tanks open to save time when operations are restarted. The tanks will just overflow through the air vents.

Stop all of the ballast pumps and close all of the ballast valves as soon as operations are stopped. Ballast lines should always be closed except when they are being used.

Just stop the pumps and close the pump suction and discharge valves. Leave the valves for the ballast tanks open to save time later.

Shut the valves for the ballast tanks but keep the pumps running and discharging overboard to save time later.

You are alongside in New York in winter-time. You commence discharge of a cargo of Caustic Soda. The ship's pumps are functioning correctly and the required valves are all confirmed as open, but no product is received on shore. Which of the following is the most likely cause of the problem?

There is frozen product somewhere in the lines.

The ship's pumps sound like they are working, but they are probably faulty.

The discharge hose has been connected to the wrong line.

The tank ullaging system on shore is defective.

Which of the following can be considered to be two of the main requirements for a paint coating for a cargo space of a General Cargo Vessel?

Low odour and heat resistant

Easy to clean and dark in colour

Light reflective and compatible with edible cargoes

Corrosion resistant and heat resistant

You are in charge of discharging and crude oil washing a crude oil carrier.What is the maximum allowed oxygen level in the Inert Gas supply to a tank being crude oil washed (IMO)?

10%

Maintenance of lifeboats and davit arrangements is routine work onboard. Why should you not carry out this type of work alone?

It is boring to work alone and you should be able to chat with colleagues while working

If you need something to drink, the second person can get it for you

If the person working on the lifeboat falls over board, the second person can lower the lifeboat and prepare pick-up immediately

There might be a risk of falling even though harness and lifeline is used. A second person should always stand by to assist with tools etc. and other practical arrangements.

You are going to do deballasting of a double bottom tank. The pump is of centrifugal type and mounted above tank level. You are having problems getting the pump to take suction. What can you do to solve the problem?

Repeat start and stop of the pump until it gets suction.

Feed the pump from the sea water inlet pipe.

Get somebody to do the job for you.

Disconect the manometer pipe to get rid of an air pocket .

Where would you look for definitive information on whether a particular cargo is classified as a "Noxious Liquid Substance"? (Other than products provisionally assessed).

The pollution category column of chapters 17 or 18 of the International Bulk Chemical Code (IBC Code).

The product groups within the list of cargoes contained in the Chemical Data Guide for Bulk Shipment by Water.

The Procedures and Arrangements Manual.

The pollution category of chapter 17 (only) of the International Bulk Chemical Code (IBC Code).

What is related to a high GM?

Decreasing righting moments

Increasing righting moments

Increasing angles of roll

Decreasing transverse accelerations

How frequently should the PA-system (Public Address) be tested?

Every week

Every year

Every day

Every second year

Once a vessel has discharged a fruit cargo it is important to check that all cargo residues have been removed, particularly if the next cargo is to be a sensitive fruit cargo. From the options given, select the most important reason for this requirement.

The cargo residue is unsightly.

The cargo residue can produce large amounts of ethylene.

The cargo residue may become smelly.

The cargo residue may attract the attention of the loading surveyor.

What does ODME mean?

Oil Detecting - Master Evaluating.

Oil Discover Measure Equipment.

Over board Detecting Measure Equipment.

Oil Discharge Monitoring Equipment.

According to guidance provided by the OCIMF, what is the requirement for bolting/securing blind flanges on the manifolds during cargo operations on an oil tanker?

A bolt to be in every alternate bolt hole, tightened evenly

A minimum of 4 bolts, spaced evenly around the flange

Bolts or clamps to be fitted such that the flange is adequately sealed

A bolt to be in every bolt hole, tightened evenly

Electric ozone generators are sometimes used to remove residual odours from refrigerated cargo spaces. Which of the options given is the additional action required to ensure the operation is successful?

The cargo space should be cooled down using the refrigeration plant.

The cargo space should be fumigated.

The fans should be run continuously in the cargo space.

The source of the odour must be located and removed.

Indicate the correct name for the part marked on the sketch:

Crankshaft

Crankcase relief valve

Camshaft

Push rod

TBN - total base number from a lube oil test, indicates the:

Amount of organic acids in the oil.

Amount of contaminants in the lubricating oil.

Alkalinity of the lubricating oil.

Flash point.

What distinguishes a "parcel" chemical tanker from other designs?

Such a vessel is fitted with interactive computerised gauging, pumping, valve control and alarm systems for each tank, enabling all data for a single cargo to be concentrated in a single computer display.

Such a vessel is automatically able to achieve segregation of hazardously reactive noxious liquid substances by its design alone.

Such a vessel is fitted with a highly accurate tank gauging system, enabling it to deliver multiple parcels to different receivers from within the same cargo tank.

Such a vessel has a higher number of relatively small capacity, independent cargo tanks, each with its own line and pump, enabling it to carry and deliver multiple grades simultaneously.

The Ziegler-Nichols method is used in control engineering when setting up the system. Which of the system components given in the options would this method be applied to during initial set up?

Sensing unit to set the range.

Valve positioner to optimise speed of operation.

PID controller for tuning.

Valve and actuator to set the span of travel.

What is the purpose of the "Spray Line" as fitted in the cargo system of an LNG carrier?

It is used for cooling down the cargo lines and cargo tanks prior to cargo operation.

It is used for cooling down the inter-barrier spaces.

It is used for cooling down the void spaces and cofferdams.

It is used to flush the deck in case of cargo overflow.

What are the properties of IMDG Class 4 (Flammable Solids) cargoes?

These cargoes emit flammable gases

These cargoes are liable to spontaneous combustion

These cargoes are liable to spontaneous combustion or when in contact with water emit flammable gases

These cargoes emit toxic gases

Which of the following is a form of food poisoning?

Diabetes.

Salmonella.

Rhinitis.

Chronic dyspraxia.

The coil of a 12V, 120mA dc relay must be connected across a 24V supply. What action should be taken?

Install a 100 ohm resistor in series with the coil

Install a 100 k ohm resistor in parallel with the coil

Install a 100 k ohm resistor in series with the coil

Install a 100 ohm resistor in parallel with the coil

Debriefing of an emergency drill:

focuses attention on the debriefer's feedback

expands the experience of all personnel

encourages crewmembers to focus on their duties

is most effective when held at a safety meeting

You are the officer in charge of discharging an oil tanker of 15000 DWT in Corpus Christi, USA. Where shall the Oil Transfer Procedure be located?

Available in the Chief Officers office, or Captains office

Permanently posted in the wheelhouse

Posted or available where it can be easily seen and used by crew-members engaged in the discharge operation.

In the Captains office, available on request or when necessary

At what angle should a cargo lashing meet an eye plate?

At 90 degrees

At 30 degrees

At 60 degrees

At 45 degrees

A cargo of hard frozen, whole tuna is being loaded on a conventional reefer vessel. Select the best method of loading the cargo from the options given.

Use a rope net.

Use a pallet board.

Use rope slings.

Packed in cartons.

A new reefer vessel is described as having 'Cargo spaces lined with stainless steel, refrigeration supplied by circulating cold air around the outside of cargo spaces, no hatches on deck and one light crane'. Which of the vessel types given in the options is the most likely type being described?

A vessel designed for the carriage of fish at very low temperatures.

A vessel designed for the carriage of specialised fruit.

A vessel designed for the carriage of orange juice in bulk.

A vessel designed for carriage of chilled meat products.

Which oxygen content shall we measure before entering a tank or space after venting?

The oxygen content shall be measured to 10,8% by volume

The oxygen content shall be measured to minimum 19% by volume

The oxygen content shall be measured to 21% by volume

We don’t need to measure the oxygen content

When should a spreader be used for general cargo operations?

When the weight of a load needs to be evenly distributed by the lifting gear

When the length of a load is such that slinging it will create unacceptable bending moments

When the length of a load is such that slinging it will create sagging

When handling open-top containers

A resistor has three red bands. What is the resistance?

220 ohm

22 ohm

2200 ohm

222 ohm

On RoRo passenger ferries, the passengers are not normally allowed to be on the car-deck during sailing. What is the reason for this rule?

To prevent damage and burglary to the cars.

In case of an emergency situation, the car deck can be difficulty to find the way around, and cars can shift position caused by ships movement.

If the car deck are empty, it will be easier for the crew to locate all passengers in case of an emergency

The ships movement can make the cars slide/move and a person can be trapped between two cars.

Where shall you be able to activate the ship security alert system on board passenger ships?

From the navigation bridge and in at least one other location

Captain's- and Chief Officer's office

Navigation bridge

Captain's office

Which of the following has the highest fat content?

Sardines

Rainbow trout

Hake

Plaice

In describing the characteristics of oil cargoes or oil / water slops, what is a mercaptan?

The component of hydrocarbon-based cargoes which is formed from Merolion Carbonized Tannin.

A device fitted to a cargo pump which automatically alerts the operator once traces of water start to be detected during discharge.

A chemical additive blended with crude oil to inhibit the natural "rotton egg" smell associated with certain grades.

A colourless, odorous gas, with a smell similar to rotting cabbage and which is generated naturally by the degredation of natural organisms, as may be found where water has remained under oil for a long time.

At which of the pressures shown should the low oil pressure trip operate on a freon compressor?

+ 1.0 bar

- 0.5 bar

+ 10 bar

+ 5.0 bar

If a leak starts from a flange joint during cargo discharge, which of the following should you do?

Attempt to tighten the bolts on the flange. If the leak continues, place a container underneath the leak and ensure it is emptied into a slop tank or drum at regular intervals.

Attempt to tighten the bolts on the flange. Report the gasket as defective at the handover of the watch and leave a note in the Cargo Control Room to replace it at the end of discharge.

Report the leak to the Responsible Officer. Depending on the pipeline arrangement, stop the discharge, or isolate the section of pipeline concerned and releive the pressure inside the pipeline. Put on the appropriate personal protective clothing and equipment. Attempt to tighten the bolts on the flange. Resume discharge with caution. If the leak continues, stop the discharge and change the gasket. Clear any cargo spillage according to the applicable recovery procedure.

Attempt to tighten the bolts on the flange. Spread sawdust underneath the leak. Clear contaminated sawdust away at regular intervals and replace with fresh sawdust as necessary.

On the figure 4 possible definitions of the term "BRIDGE" are given. Which one is the correct one?

Bridge is given by B on the figure

Bridge is given by C on the figure

Bridge is given by D on the figure

Bridge is given by A on the figure

During inspection of the fan spaces an access hatch between the delivery and return side of the fan space is inadvertently left open. What would be the most likely consequence of this situaqtion?

Chilled air would short circuit from the return to the delivery air side.

The delivery air side would become overpressurised.

The fan speed would be affected.

Air would short circuit from the delivery to the return air side.

On an enclosed car deck, may the drivers stay in their vehicles during the voyage?

It is up to the captain to decide

Yes, of course

No, it is not allowed

It depends on what type of vehicle they have

What additional requirement must be observed if a cargo tank on a chemical tanker is to be cleaned by recirculation with a low flash or static accumulator product?

The tank must be inerted to less than 8% oxygen content.

All lids and other penetrations must be securely closed before recirculation is commenced.

The tank must already have been cleaned to Water White Standard to ensure no hazardous reaction with cargo residues.

The product must be allowed settling time within the tank before recirculation is commenced.

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