LNG Final Study Guide Questions and
Answers| Latest Update
Why are gas carrier cargo tanks measured both before and after loading? This practice
ensures a reliable and accurate measures of the cargo. LNG carriers often leave a heel of cargo
in the tank to help maintain tank temp or to be used as propulsion so that amount of cargo in
the heel must be accounted for.
Liquefied gases have fairly large volumetric expansion coefficient True
Vapor is included in LNG calculations. False
What value is used to calculate LNG cargos? Calorific
What is the most common gauging system used in liquefied gas carriers. Float type
What is a Certificate of Origin? This is a document that states where the cargo is from it is
used with the Bill of lading and is important for cleaning customs.
The overall approach in the avoidance of hazards to personnel should always be in order of
preference: a. Remove hazards
b. Control Hazards
c. Enter with PPE
List 3 of the 5 health hazards associated with the carriage of liquefied gas cargos. a.
frostbite
b. flammability
c. Chemical Burns
, Define TLV-TWA This is the concentration of vapor that one can be exposed to for 8
hours/ 40 hours per week for a lifetime without haivng any harm/ effects from the exposure.
Define BLEVE Boiling Liquid Expanding Vapor Explotion
Caused by flame impingment
For a static electrical discharge to occur there are three necessary stages which must take place
a. Electrical separation
b. electrical Accumulation
c. Electrical Discharge
List 2 sources of static electricity a. Vapor with particles in pipe
b. Liquied in a pipe
In preparing for hot work, list three requirements found on a hot work permit a. Gas free
b. Continuous ventilations
c. Fire watch
Describe a jet fire Caued by a failure in a valve or flange creating a vapor cloud which
becomes alighted. best to let ESD kick in and burn itself out.
What is the most common extinguishing agent used on LNG fires? Dry Chem
Lis three principle hazards found on liquefied gas carriers a. Toxicistiy
b. Flamiblty
c. Frostbite
Answers| Latest Update
Why are gas carrier cargo tanks measured both before and after loading? This practice
ensures a reliable and accurate measures of the cargo. LNG carriers often leave a heel of cargo
in the tank to help maintain tank temp or to be used as propulsion so that amount of cargo in
the heel must be accounted for.
Liquefied gases have fairly large volumetric expansion coefficient True
Vapor is included in LNG calculations. False
What value is used to calculate LNG cargos? Calorific
What is the most common gauging system used in liquefied gas carriers. Float type
What is a Certificate of Origin? This is a document that states where the cargo is from it is
used with the Bill of lading and is important for cleaning customs.
The overall approach in the avoidance of hazards to personnel should always be in order of
preference: a. Remove hazards
b. Control Hazards
c. Enter with PPE
List 3 of the 5 health hazards associated with the carriage of liquefied gas cargos. a.
frostbite
b. flammability
c. Chemical Burns
, Define TLV-TWA This is the concentration of vapor that one can be exposed to for 8
hours/ 40 hours per week for a lifetime without haivng any harm/ effects from the exposure.
Define BLEVE Boiling Liquid Expanding Vapor Explotion
Caused by flame impingment
For a static electrical discharge to occur there are three necessary stages which must take place
a. Electrical separation
b. electrical Accumulation
c. Electrical Discharge
List 2 sources of static electricity a. Vapor with particles in pipe
b. Liquied in a pipe
In preparing for hot work, list three requirements found on a hot work permit a. Gas free
b. Continuous ventilations
c. Fire watch
Describe a jet fire Caued by a failure in a valve or flange creating a vapor cloud which
becomes alighted. best to let ESD kick in and burn itself out.
What is the most common extinguishing agent used on LNG fires? Dry Chem
Lis three principle hazards found on liquefied gas carriers a. Toxicistiy
b. Flamiblty
c. Frostbite
