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Home Online tests CES Oil tanker MASTER / Ch-Officer Test online CES 5.1 for MASTER / Ch-Officer, Oil tanker vessel
Online testing: Test online CES 5.1 for MASTER / Ch-Officer, Oil tanker vessel
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The test consists of random questions on a selected topic.
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Fixed pressure water-spraying fire-extinguishing systems are widely employed in all kinds of vessels, mainly passenger ships and ro-ro ships, with a high degree of success. The aim of these systems is to put out a fire but they may also be very useful even if they only ensure
the control of temperatures of surrounding areas
the structural protection of the vessel
all the answers are good
the confinement of a fire
At the and of a radio telex-connection, when a ‘store and forward' –message has been transmitted, the coast-station at least gives a:
Reference number
Time (in UTC) whereupon the telex for the subscriber is delivered.
Approximate time when telex will be delivered
Code in letters which will be repeated when the telex has been delivered to the subscriber
Select the correct send and receive frequencies for sending a DSC ‘distress alert’ in the MF band:
TX: 2189.5 kHz RX: 2177.0 kHz
TX: 500.0 KHz RX: 518.0 KHz
TX: 2187.5 kHz RX: 2187.5 kHz
TX: 2177.0 kHz RX: 2177.0 kHz
The Urgency Message from a ship is used to notify other traffic of a situation where the ship is not in imminent danger, but where the development of the situation is uncertain and may need assistance in the near future. What is the telephony urgency message like?
RESCUE-RESCUE
SECURITE
PAN-PAN
MAYDAY
A DSC-message of the “safety” category is received from another vessel on VHF channel 70. Conforming to the GMDSS rules, for the continuation of the safety traffic, you must change to VHF-channel:
Don't know
70
16
07
What is false regarding the function :” Transmission and reception of ship to ship distress alerts
On area A4 this function is based on the use of VHF or/and MF DSC
On area A2 this function is based on the use of VHF or/and MF DSC
On area A3 this function is based on the use of INMARSAT A, B or C
On area A1 this function is based on the use of VHF DSC
Which country requires a vessel to have a written Waste Management Plan?
U.S.A
All countries in the IMO
The Nordic countries
Holland
Rule 12 of the International Collision Regulations prescribes the action to be taken by a sailing vessel when meeting another sailing vessel. This depends on the direction of the wind relative to each vessel. In the situation shown here, which sailing vessel (A or B) must keep out of the way of the other?
Sailing vessel B must keep out of the way of sailing vessel A.
Sailing vessel A must keep out of the way of sailing vessel B.
The upwind sailing vessel must keep out of the way of the downwind sailing vessel.
Both sailing vessels are required to take avoiding action.
When a conventional rudder is put hard over it creates a lift force and a drag force. When the ship has started to turn, how much lift force do you think remains if the rudder-angle is decreased to 20 degrees from hard over position (35 degrees)?
About 80 %.
About 10 %.
About 50 %.
About 30 %.
By what date must ALL vessels fully comply with GMDSS requirements?
1st February 1994
1st February 1995
1st February 1999
1st February 1997
" On area A3 the function "" Transmission and reception of signals for locating "" is mainly based on:"
the use of SART transponders
the use of MF DSC
the use of HF DSC
the use of SARSAT COSPAS Epirbs
Which of the following is the correct minimum carriage requirement for a ship of more than 300 gross tons and operating in area A:
1or 2 SART – 1 NAVTEX and/or 1 EGC receiver and/or 1 HF NBDP watch receiver – 2 or 3 VHF portable – 1 1 HF RT + DSC+ DSC watch receiver
1VHF RT + DSC+ DSC watch receiver – 1 or 2 SART – 1 NAVTEX or 1 EGC receiver– 2 or 3 VHF portable – 1 EPIRB – 1 MF RT + DSC+ DSC watch receiver – 1 INMARSAT A,B or C
1VHF RT + DSC+ DSC watch receiver – 1 NAVTEX or 1 EGC receiver– 2 or 3 VHF portable – 1 EPIRB – 1 MF RT + DSC+ DSC watch receiver – 1 INMARSAT A,B or C and 1 HF RT + DSC+ DSC watch receiver
1VHF RT + DSC+ DSC watch receiver – 1 or 2 SART – 1 NAVTEX and/or 1 EGC receiver and/or 1 HF NBDP watch receiver – 2 or 3 VHF portable – 1 EPIRB – 1 MF RT + DSC+ DSC watch receiver – 1 HF RT + DSC+ DSC watch receiver
Give the meaning of the following symbol:
muster station to davit launched liferaft
inflate liferaft
davit launched liferaft
lower liferaft to water
The minimum number of lifebuoys required on passenger ships depends on:
the length of the ship
the tonnage of the ship
the sea area in which the ship is allowed to sail
the number of persons on board
A person wearing an adult lifejacket shall be able:
to swim a short distance through the water and board a survival craft
to dive half a meter under the water surface
to jump from any height into the water without being injured or damaging the lifejacket
to swim half a mile distance and board a survival craft
Which of the following requirements regarding life-buoys do NOT correspond to present regulations? (SOLAS III/7.1)
Not less than half the total number of lifebuoys shall be provided with self-igniting lights
All life-buoys shall be placed in holders with quick-release arrangement
at least one life-buoy on each side of the ship shall be fitted with a buoyant lifeline
At least one lifebouy shall be placed within the vicinity of the stern
*The freeboard of a lifeboat, measured from the waterline to the lowest opening through which the lifeboat may become flooded:
Should exceed 1.5 % of the lifeboat length when fully loaded
Should exceed 0.5 metres when fully loaded
Should exceed 0.5 metres when loaded with 50 % of the number of persons the lifeboat is permitted to accommodate, these persons being seated to one side of the centreline
Should exceed 1.5 % of the lifeboat length when loaded with 50 % of the number of persons the lifeboat is permitted to accommodate, these persons being seated to one side of the centreline
Which of the survival craft listed below is equipped with a buoyant line, not less than 50m in length, of sufficient strength to tow a liferaft ?
Life raft
None of them
Lifeboat
Rescue boat
Which item among those below is included in the normal equipment of every lifeboat ?
sea-charts and navigating equipment
one immersion suit for each person
a VHF transceiver
portable fire-extinguishing equipment suitable for oil fires
How many hand held distress flares are carried in each liferaft?
2
6
Nil
4
On board passenger ships an abandon ship drill must be performed:
Every week
Every month
Every three months
Every two weeks
Why should there be checklists or work permits for hazardous operations?
To locate crew members in case of emergencie
So we know who to blame when something goes wrong
To make sure the job is done under controlled conditions
Because it is required by USCG (US Coast Guard)
What is the purpose of an expansion valve in a refrigeration system circuit?
To control the cooling water temperature through the condenser.
To control the cargo hold temperature.
To control the flow rate of liquid refrigerant to the evaporator.
To control the suction pressure at the compressor.
During replacement of the main bearing shells on a medium speed diesel engine it is necessary to remove both the top and bottom half shells. From the options given select the method that is most commonly employed to remove the bottom half shells from the bearing pockets on an engine with a traditional bedplate?
Jack up the crankshaft and use a suitable punch to loosen the bottom half shell in the pocket so it can be lifted out with a pair of grips.
Fit a driver in the crankshaft oil hole which bears against the edge of the bottom half shell and turn the engine.
Turn the engine to a position where the crank webs are clear of the shell and knock the bottom half shell out axially using a suitable punch.
Remove the crankshaft so that all the bottom half shells can be removed at the same time.
With respect to earthing (grounding) of signal cables. Which of the 4 alternatives is correct for a cable for analogue signals?
Figure 1.
Figure 2.
Figure 4.
Figure 3.
Which one of the statements given in the options is correct in relation to the maintenance and adjustment of 4-stroke, medium speed diesel engines?
The piston ring groove clearances for the oil control ring are unimportant as this ring does not form part of the gas seal.
Liner wear of up to 3% of the bore size is generally acceptable for continued service.
Both the top and bottom shells of a bottom end bearing should be inspected as they can wear due to load reversal during the engine operating cycle.
Timing of inlet and exhaust valves can be correctly set by varying the tappet clearance.
What are the common types of independent nitrogen generator found on chemical tankers?
x
membrane and
In relation to exhaust gas measurement with a thermocouple, use of an amplifier which gives a mA-signal out is preferred. Why is this done?
This depends on the length of the compensation-cable.
The output signal from a thermocouple is at mV level,and can not be transferred over any long distance without loss of signal, giving a poor accuracy and poor noise immunity.
The signal out from the thermocouple is also mA, but have to be amplified in order to give a good signal to the alarm system.
To stabilize the signal andmake it easier to measure at the receiver.
Why is it important for hatch coaming compression bars to be maintained in good order?
So that hatch covers remain water tight
So that water can drain out from the hatch coaming drains
So that there is no steel contact between the hatch covers and hatch coaming
So that hatches can be properly sealed
You are to supervise a hot work repair in a cargo tank on an oil tanker. You have measured the atmosphere inside the compartment as 21% oxygen content by volume and less than 1% LFL hydrocarbon vapour concentration. Does this mean the work can commence? (Select the most correct option)
No. The flammability reading should be maximum 0.5% LFL hydrocarbon vapour concentration for any hotwork to take place. .
Yes, provided that continuous readings are maintained throughout the operation and flammability readings do not exceed 2% hydrocarbon vapour content in the immediate vicinity of the hotwork site. .
Yes. The minimum safe requirements for hot work have been met.
No. Further precautions need to be taken. The area around the work site needs to be cleaned and checks need to be made on adjacent spaces. Additional precautionary measures may need to be put in place.
A new gasket has been fitted to the manhole cover of a ballast tank. Which of the options given would be a suitable test that the new gasket is correctly fitted?
Carry out a hose test on the manhole cover.
Carry out an air pressure test on the ballast tank.
Fill the tank with water up to capacity.
Fill the tank with water until it overflows through the air vent.
You can reduce the need for security guards in certain areas by installing:
Anti-intruder devices
Vapour detectors
Water cannons
Metal detectors
As well as having temperature sensors located in the cargo holds some reefer vessels are also fitted with ethylene sensors. Why is it useful to have information regarding the ethylene content in a reefer vessel cargo hold when carrying fruit cargoes?
The ethylene content must be maintained to help ripen the fruit during the sea voyage.
Some fruit cargoes are sensitive to ethylene and the quality of the cargo can deteriorate as they may over-ripen.
The ethylene content can be used as a guide as to when air change fans need to run.
The ethylene content is beneficial to perishable cargoes in transit so the content needs to be monitored in case the level falls.
Is it required that the PA-system (Public Address) is connected to a back-up power sypply?
No, the crew will inform the passengers in case of any black out or power failure
Yes, only if the voyage is more than 12 hours
Yes, the public address system shall be connected to the emergency source of power
No
Why is it important to have good relationship on-board a vessel?
It leads to better work performance and positive atmosphere among the crew
Crew comes to know each others problems
It encourages crew to extend their contract
It will prevent accidents from happening
Which statement is true about loading lifeboats?
Passengers with physical disabilities should go on life rafts.
Passengers with physical disabilities should go on lifeboats.
Only passengers with physical disabilities should go on lifeboats.
Passengers with physical disabilities are loaded from a floating platform.
Is it allowed to gas up LPG on inert gas atmosphere?
We are not allowed to gas up LPG on inert gas
We are allowed to gas up LPG on inert gas if the inert gas contain less than 5% volume oxygen
We are allowed to gas up LPG on inert gas if the charterer do not instruct the vessel to use nitrogen
We are not allowed to gas up LPG on inert gas if the inert gas contain less than 5% volume oxygen
What name is given to the knife used for cutting meat from a joint during service?
Carding knife.
Carping knife.
Paring knife.
Carving knife.
A sudden or gradual decrease in the pH-value, or an increase of the sulfate content, in the cooling water may indicate:
Leakages from seawater coolers
Leakages from L.O. coolers.
Exhaust leakage
High concentration of corrosion inhibitors
What is the requirement with regard to Familiarisation on board?
During the first tenure, seafarers are responsible for asking at least a 100 questions to the Safety Officer.
Seafarers, on being assigned to any ship, shall be familiarized with their specific duties and with all ship arrangements, installations, equipment, procedures and ship characteristics that are relevant to their routine or emergency duties.
Seafarers on board passenger vessels must as soon as possible learn the names of all persons working in the same department in order to ensure efficient daily operation.
Seafarers shall be familiarized with all life saving appliances and emergency exits in case any emergency situation occurs. It takes normally an hour to complete the Safety Familiarisation. The safety Officer is responsible.
What are the requirements for the number of portable gas measurement instrument(s) on tankers?
At least one instrument for measuring %LEL and one instrument for measuring volume %
Sufficient number of instruments.
At least 2 portable instruments for measuring flammable vapours.
At least 1 portable instrument for measuring flammable vapours.
During inspection of a medium speed diesel engine piston of the composite type it is found that the steel crown is loose at its connection to the alloy skirt. Further inspection reveals damage to the surfaces and evidence of metal particles where the two parts are connected. Select, from the options given, the likely cause of this type of damage.
Fatigue due to excess compression at the joint between the components.
Crushing due to over tightening of the piston crown retaining bolts.
Shear of the metal surfaces due to excessive load on the engine.
Fretting due to loss of compression at the joint between the components.
Three earth lamps indicate - bright - bright - dark. Which of the following is indicated by this condition?
Two phases are good and one has a partial fault to earth
Two phases are good and one has a hard fault to earth
No faults on the system but a failed lamp
Two phases have a partial fault to earth and one is good
What should be the breaking stress of lashing belts used to secure light vehicles, on board a ro-ro vessel?
3.0 to 3.5 tonnes
1.2 to 1.5 tonnes
2.0 to 2.5 tonnes
4.5 to 5.0 tonnes
Which statement is true?
Normal temperature of the lub oil after the cooler is approx. 45 C.
When the ME is running, the Fresh Water enters the engine at the top and leaves the engine at the bottom
Normal temperature of the oil after the cooler is approx. 65 C.
Minimum scavening air temperature is 60 C to avoid dewing in the scavening air cooler
What is the requirement to number of inert gas blower(s)?
At least 2 blowers.
Sufficient to obtain minimum 500 mm water column during discharging.
The are no requirement to number of blowers.
1blower.
In the context of ship design, what does the abbreviation "OBO" stand for?
Ordinary Blend Oil
Ore Bulk Oil
Oil Bulk Overall
Only Bulk Ore
What is the requirement with regard to Familiarisation on board?
During the first tenure, seafarers are responsible for asking at least a 100 questions to the Safety Officer.
Seafarers, on being assigned to any ship, shall be familiarized with their specific duties and with all ship arrangements, installations, equipment, procedures and ship characteristics that are relevant to their routine or emergency duties.
Seafarers shall be familiarized with all life saving appliances and emergency exits in case any emergency situation occurs. It takes normally an hour to complete the Safety Familiarisation. The safety Officer is responsible.
Seafarers on board passenger vessels must as soon as possible learn the names of all persons working in the same department in order to ensure efficient daily operation.
In RoRo Cargo Planning What should be considered for the location of stowage of a heavy loads such as transformer, locomotive or work boats?
The discharge port rotation
Requests from the stevedore
The stability of the vessel, access to the location and the SWL of the stowage location
Following repair and refitting of the seawater pipe for the fresh water generator feed line the rating assisting with the work notices that one of the flange joints is leaking. What action should be taken by the rating?
Check the bolts are correctly tightened before informing the engineer so that the flange faces can be cleaned and re-jointed if necessary.
Shut off the water and apply silicon or other sealing compound to the outer edge of the flange joint.
Use a spanner with an extension pipe to try and stop the leak by tightening the flange bolts as much as possible.
Use a hammer and flogging spanner to try and stop the leak by tightening the flange bolts as much as possible.
Who has the responsibility to ensure that the highest standards of cleanliness and hygiene are maintained in the galley? (Select the most correct answer)
Every person working in the galley area, engaged in the handling or preparation of food.
The Chief Cook.
The Master.
The Superintendent.
What is the maximum pressure that the safety valve on a steam boiler should be set to lift?
3% above the normal working pressure.
10% above the normal working pressure.
At the maximum design or maximum permitted working pressure of the boiler.
3% above the maximum design pressure..
A transformer overheats while taking a shore supply. Which is the likely cause?
Incorrect voltage
Incorrect current
Incorrect earthing
Incorrect frequency
What is the advantage of a large ship?
The advantage of a large ship is that it contributes to safe transportation of goods
The advantage of a large ship is that it can cope with most emergency situations
The advantage of a large ship is that it can easily be manoeuvred
The advantage of a large ship is that it is economical to operate
Modern conventional reefer vessels are designed to carry containers on deck which are usually 40 foot units weighing more than 20 tonnes when stuffed (filled with cargo). For a vessel fitted with deck cranes having a SWL of 19 tonnes which of the options given is the most appropriate method of handling such containers?
Temporarily override the crane's cut outs when handling such containers.
Arrange for a floating crane to be alongside when handling the containers.
Arrange for a mobile crane to be available when handling the containers.
Use an equalising beam with two of the ship's cranes operating in tandem.
Which of these situations will cause undue delay to a vessel at her port of discharge?
Slow operation of hatch covers
Carrying out an off-hire survey
Carrying out an open-hatch condition survey
Asbestos mixed with the cargo
A ship has an electrical system rated at 690 Volts. Which voltage level is this?
Medium voltage.
Low voltage.
High voltage.
Intermediate voltage.
When long-handled pans are in use on the range, how should the handles be positioned?
Long handled pans are prohibited at sea. Only those with small grip side handles can be used.
They should be turned outwards, so they are accessible at all times.
They should be turned inwards, so they are not accidentally caught by people passing by.
They should be wrapped with wet cloths and the pans positioned on the back hot plates, so that they will be safe from passers by but can be picked up at any time.
Passenger ship engaged in international voyages shall carry through a muster for all passengers. At what latest time after embarkation shall the muster take place?
Before departure
No time limit
4 hours after the passengers embarked
Within 24 hours after the passengers embarked
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.
Which of the options given is the most likely reason for a drop in pressure at the charge air manifold of a diesel engine?
Air filter to turbocharger fouled or obstructed.
Increased engine load.
Charge air cooler fouled on waterside
Air passageways or ports to the engine cylinders partly blocked due to fouling.
Who decides the number of lashings you should put on a trailer?
The loading officer
The Bosun
The operation manual
The captain
The typical “daylight-frequencies” for long distance transmission are located in the:
16 or 22 MHz-band
Don't know
8 or 12 MHz-band
4 or 6 MHz-band
Which type of equipment can be used to detect explosives?
CCTV
Metal detector
Particulate detector
Water cannon
A three phase alternator is connected singularly to the main switchboard. The switchboard instruments show 400 Volts/500 amperes. With a power factor of 0.5 what will be the kW load?
100 kW
57.5 kW
250 kW
173.2 kW
What must be done after completion of ballasting operations on a bulk carrier?
All valves closed, tank ventilators in open position and sounding pipe caps replaced.
Sounding pipe caps left off
All valves and lines left open
All valves closed and tank ventilators to closed position
When handling drugs…
Wear skin protection and a facemask.
"Briefly inhale powders, fumes or vapours to verify the substance is a drug."
Test out the potency of the drug.
Shut off the ventilation in the room where the drugs are being stored to ensure any vapours or fumes do not spread to other parts of the ship.
How are the surfaces of ro-ro vehicle decks and ramps treated?
With non-slip tapes
With non-skid paints
With anti-fouling paints
With rubber-based paints
What is the disadvantage of using High Tensile Steel (HTS) in the construction of bulk carriers?
HTS is prone to fatigue cracking
When compared with mild steel HTS increases the lightship displacement
HTS does not form a proper bond with paint coatings
HTS is prone to pitting
The pressure inlet to a pressure gauge is varied from zero to full scale and back to zero again. The output (indicating pressure) versus true pressure is shown in the diagr.The non - coincidence(mis - match) of loading and unloading curve is due to internal friction in the instrument. What do we call this phenomenon?
Dead band
Threshold
Hysteresis
Resolution
Which is the "CAPSTAN", in the figure?
The Capstan is indicated by A, in the figure
The Capstan is indicated by D, in the figure
The Capstan is indicated by C, in the figure
The Capstan is indicated by B, in the figure
What is a Fantainer used for?
Carrying dangerous goods prone to condensation
Carrying reefer cargoes prone to condensation
Carrying dry cargoes prone to condensation
Carrying steel coils
The best way to ensure you get the equipment you need is to:
Buy what everyone else is buying.
Determine your needs and do some research.
Buy the most expensive equipment on the market.
Buy the newest models.
The circuit consists of two capacitors, C(1) = 6 µF and C(2) = 12 µF, in parallel. Calculate the equivalent C(S) of the two capacitors.
C(S) = 2 µF
C(S) = 1,5 µF
C(S) = 18 µF
C(S) = 4 µF
What is the main reason that passenger baggage creates problems for crowd control?
If passengers are already in muster stations, you will have to allow them to return to cabins to retrieve baggage.
Muster stations are crowded, and passenger baggage takes up space.
There isn't room in the life rafts, and crewmembers will have to tell passengers to leave baggage behind.
Passenger baggage clutters escape routes, and embarkation stations, and slows down an evacuation.
You should use short and simple words, rather than long, complex words, when giving emergency instructions. What is the main reason for this?
People are more likely to understand you.
You won't have to think too hard about what you are saying.
You won't have to repeat the instruction.
Short words take less time to say and you don't have much time.
Where should grease be applied to a twistlock?
Over the entire outer surface
Under the handle
Between the twistlock cone and associated housing
At the base of the twistlock cone
Frozen cargo such as lamb carcasses requires careful loading to ensure a neat and tight stow in the hold and requires the crew and stevedores to have considerable skill to achieve this. Which of the options given is the main reason for this?
The carcasses are difficult to pick up when handling.
The carcasses are heavy.
The carcasses are of an irregular shape.
The carcasses are often large.
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
The cargo tanks of liquefied gas carriers are usually insulated. Why is it necessary to insulate these tanks?
To protect the cargo tank from collision damage.
To minimise heat transfer to the cargo and to avoid excessively low hull temperatures.
To prevent static electricity build up in the cargo tanks.
To reduce the volume of the hold space.
Whish of the following disposal would be permitted?
Food waste from a vessel outside a special area and 10 miles from nearest land
Food waste from a vessel inside a special area and 10 miles from nearest land
Paper products from a vessel inside a special area and 15 miles from the nearest land
Food waste from a vessel outside a special area and 12 miles from the nearest land
What is the purpose of a Bridge Fitting?
To link the top containers of adjacent stacks
To link the top containers stowed at the fore end of the vessel
It is used as extension pieces for lashing rods secured to a lashing bridge
To link the top containers secured to a lashing bridge
How often should boiler water tests be carried out on a steam boiler?
Every hour.
Every day.
Every fortnight.
Every week.
How many carbon atoms are there in solid materials?
Above 16 carbon atoms.
I don't know.
From 5 to 16 carbon atoms.
Up to 4 carbon atoms.
Why must inert gas from a combustion-type generator never be used when preparing cargo tanks for ammonia?
Because of the high oxygen content in inert gas.
Because ammonia reacts with the carbon dioxide in inert gas.
Because of the high water content in inert gas.
Because of the high temperature in inert gas.
Some fuel oil and lubricating oil separators have a facility to control the back pressure of the clean oil outlet. What is the purpose of this control function?
To help to maintain the oil/water interface at the correct position.
To control the amount of fuel passing through the separator.
To reduce the amount of sealing water required during operation.
To assist in discharging the bowl contents during the sludge cycle.
When patrolling the car deck during a voyage you should observe the following elements:
Check that fire hoses are connected to the fire hydrants
Any abnormalities such as leakages, fumes, smoke or fire. Check if the lashings need to be tightened on lashed cargo.
heck if all the lights are switched off and the doors are closed
Smoke or fire
What is the colour and characteristic of a "towing light", as defined in the International Regulations for Preventing Collisions at Sea?
Amber, all-round, flashing, where it can best be seen.
One of two all-round amber, alternate flashing lights, displayed where they can best be seen.
Yellow, fixed, seen over an arc of 135 degrees and so arranged as to display 67.5 degrees from right aft on each side of the vessel.
White, fixed, displayed as an additional light on the foremast over an arc of 225 degrees, from right ahead to 22.5 degrees abaft the beam on each side of the vessel.
What is most important for the personnel on duty to supervise during a discharging operation including crude oil washing?
Have a check every 30 minutes.
Check once during every watch.
Act according to the check list “during crude oil washing”.
Nothing in particular.
In what kind of atmosphere should tank washing be carried out when no inert gas plant is in operation?
After having send a man down in the tank to check that there is no more oil left.
After having aired the tank for at least 24 hours
Ventilate the tank up to 21% oxygen.
Too lean ( less than 2% by volume of hydrocarbons) or over rich ( in excess of 15% by volume of hydrocarbons ).
This online test consists of 90 random questions from CES 5.1 tests on a topic of your choice.