gas Flashcards
what are three types of gas systems that process technicians will encounter in a large production
Fuel gas, nitrogen, and air
Oxygen, Nitrogen and methane
answer A
What are the three different air systems that process technicians are likely to encounter at a large production facility?
compressed hot and fridged air
Utility, instrument and breathing air
Pure oxygen, concentrated and compressed air
answer B
Which air system normally has the least-strict quality requirements?
breathing air
utility air
instrument air
answer B
What should be done to a compressed air system to ensure that water vapor is not entrained in utility and instrument gas systems?
Flush the system out with nitrogen.
Operate at dewpoint temperatures lower than ambient down to -112 degrees Fahrenheit.
answer B
Water under atmospheric pressure boils at 212 degrees Fahrenheit. What happens if you decrease the pressure?
The boiling point sometimes increases and sometimes decreases.
The boiling point decreases.
answer B
What is the purpose of a knockout drum or knockout pot?
to remove liquids from liquids from gas
To remove suspended solids from a gas
answer B
What term is used to describe a solid substance that can adsorb water vapor as it passes through a fixed bed?
a blow dryer
a desiccant
answer B
Wet Instrument air can (select all that apply):
cause corrosion
freeze in cold air
cool the process
answer A,B
What is often used as backup gas for instrument air?
Gas
Helium
Nitrogen
Pentane
answer C
The biggest hazard of nitrogen is:
Asphyxiation
Flammability
High pressure
answer A
The biggest hazard of nitrogen is:
asphyxiation
flammability
answer A
Natural gas is composed mostly of:
propane
CO2
Methane
answer C
What is the main hazard associated with natural gas?
high temperature
corrositivity
flammability
answer C
Approximately how many lives were lost in the New London, TX school explosion?
100
200
300
400
answer C
What was the positive outcome from the New London, TX school explosion?
Odorants are added to natural gas to give it a distinctive smell.
All schools must be equipped with LEL meters to detect gas leaks.
answer A
The pilot gas in a fuel system feeding a furnace is supplied to the burners from
refinery off-gas
a natural gas source
answer B
Which fuel gas component has the highest number of carbon atoms per molecule
pentane
bentane
propane
answer B
Why is it critical in gas systems to ensure that the proper connections are in place with the appropriate safety reliefs?
Because leaked materials can liquefy and short out equipment
Because these systems operate under high pressure
answer B
Which of the following is a process technician’s responsibility associated with working with compressors?
purging liquids
monitoring humanity
answer A
High noise levels are among the common hazards associated with _______
compressor and compressor systems
filter systems
answer A
Why must the distribution piping and hoses used in a compressed gas system be rated for the operating pressure of the system?
To reduce the potential for a piping or hose rupture
To avoid unnecessary replacement
answer A
What is added to natural gas to help manage the safety risks?
Mercaptans / Odorizers
process vents
answer A
