Can H2S be dissolved into water?
How does the density of H2S compare to that of air?
H2S is the same density as air.
ISGOTT recommends that workers wear a personal alarm when they may be exposed to H2S. At what level does ISGOTT recommend that the alarm be set?
ISGOTT refers to TLVs when talking about H2S exposure. What does “TLV” stand for in this case?
In which one of the following places on a ship is H2S most likely to be found?
Around diesel engine cylinder heads.
Over what time are the H2S levels averaged when calculating ISGOTT’s TLV-TWA?
Select all the symptoms that you think may be symptoms of harmful exposure to H2S?
Select all the symptoms that you think may be symptoms of harmful exposure to H2S?
What does ISGOTT recommend that you do when the H2S level is expected to rise rapidly, such as when removing cargo line blanks?
Run a fan nearby to blow the gas away.
Take H2S readings more often.
Undo the bolts at arm’s length.
What is the ISGOTT Time Weighted Average exposure limit (TLV-TWA) quoted for H2S in this module?
What is the allowable exposure limit for H2S?
There is no single allowable limit. Different regulations set different limits.
Which of the following best describes how a gas detection tube is used to find out if H2S is present in a space?
The amount of colour change in the tube gives an H2 reading.
The glass tube will become cloudy if H2S is present.
The tube turns blue if H2S is present.
The amount of electric current passing through the tube gives an H2S reading.
Which of the following best describes the effect on your skin caused by exposure to H2S over long periods?
No effect, provided a cotton boiler suit is worn.
Which of the following best describes the possible effect of drinking alcohol before being exposed to H2S?
The effects of H2S are worse.
The effects of H2S are less.
H2S reacts with the alcohol on your breath causing mouth burns.
Which of the following is the best action if you begin to show symptoms of H2S exposure?
Get fresh air, leave the work area and call for help.
Take a 15-minute break and resume work.
Keep working and call for help.
Ignore the symptoms and continue working.
Which one of the following best describes a major safety hazard of H2S?
It loses its rotten egg smell.
It burns with a yellow flame.
Which one of the following best describes the effect of exposure to a low level of H2S on your eyes?
Reduced vision due to the gas cloud.
Which one of the following best describes the factors that decide how much H2S exposure affects your body?
Frequency, intensity and duration of exposure as well as individual factors.
Frequency and intensity of exposure as well as individual factors.
Intensity and duration of exposure.
Frequency and intensity of exposure.
Which one of the following best describes why we often use a time weighted average when measuring H2S exposure?
It measures two of the most important factors which determine the harm caused by H2S.
Concentrations of H2S are constantly changing and readings need to be averaged.
It allows you to work in high levels of H2S so long as you take the next day off.
It is easier to measure than the instant value of H2S.
Which one of the following describes how H2S would normally enter your body while on board a ship?
Absorption and inhalation.
Ingestion and absorption.
Injection and absorption.
Which one of the following describes how an electric meter can be used to safely measure H2S, a flammable gas?
The meter is certified for use in explosive atmospheres.
The meter is powered by a hand crank.
The meter is powered by a piezo-electric cell.
The meter is kept in the accommodation and sample is taken via a rubber tube.
Which one of the following describes the main source of the H2S found on board ships?
Which one of the following describes the most likely way H2S can be brought on board a ship?
Bunkering residual fuel oil.
Taking on harbour water as ballast.
Which one of the following does ISGOTT recommend you do if your personal H2S alarm sounds while you are at the bottom of a cargo tank?
Use an emergency air supply while you move to a safe area.
Start to calculate your time weighted average exposure since you started work.
Climb the vertical ladder to the tank entrance.
Which one of the following is a symptom of H2S exposure?
Which one of the following is the best way to approach a workplace where H2S is expected to be, according to this module?
Approach while using a detector which takes continuous H2S measurements.
Do not enter the workplace.
Keep clear by testing for H2S using a sample tube on a long stick.
Which one of the following is the best way to approach a workplace where H2S is suspected to be, if continuous monitoring is not available?
Wear a positive pressure SCBA until H2S levels have been shown to be safe.
Do not approach the workplace.
Hold your breath until H2S levels have been shown to be safe.
Keep clear by testing for H2S using a long rubber sample tube.
Which one of the following may protect you from H2S, while you give artificial respiration on a ship to someone who has been exposed to H2S?
A mechanical resuscitation pump.
Which one of the following statements about H2S is true?
H2S may still remain in an oil cargo tank after gas freeing.
Crude oil washing will remove all H2S from an oil cargo tank.
Water washing will remove all H2S from an oil cargo tank.
An oil cargo tank with an oxygen level of 20 % will not contain H2S.
Which one of these statements correctly describes the colour of H2S?
Which one of these statements correctly describes the smell of H2S?
It smells like rotten-eggs.
It smells like wet grass.
Which one of these statements correctly describes what happens when we try to burn H2S?
H2S burns in air with a blue flame.
H2S will burn in pure oxygen but not in air.
H2S burns in air with an orange flame.
Which option best describes what happens if you breathe so much H2S into your lungs that your body is unable to break it down?
Your lungs will stop working and you can suffocate and die.
You will die of pneumonia.
You will develop skin cancer.
Your throat will become very red and sore.
Why is it dangerous to rely on your sense of smell to detect the presence of H2S?
H2S can cause you to lose your sense of smell.
H2S only has a smell when the concentration is above safe working limits.
H2S does not have a recognisable smell.
You start to smell H2S while working. Which one of the following would you expect to be the first symptom you notice if H2S levels continue to rise?
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