Module 8 Oxy Fuel Equipment Flashcards
Which gas is produced using the air liquefaction process?
A) acetylene
B) oxygen
C) propane
D) hydrogen
B) oxygen
Explain why oxygen is dangerous
It is combustible and may react violently with some materials
For efficient heating and cutting operations, oxygen must have a minimum purity of
A) 80%
B) 93%
C) 98.6%
D) 99.5%
D) 99.5%
Oil or grease in contact with pure oxygen can:
React violently and cause an explosion
Explain how acetylene gas is produced
By mixing calcium carbide and water in an acetylene generator
Define acetylene generator
A machine used to produce acetylene gas by bringing specific amounts of granulated, calcium carbide, and water together under strictly controlled conditions. the vapours acetylene gas is collected from the generator as it is produced, and it is placed into specifically design cylinders for storage and use
A) the critical pressure for acetylene is_______kPa(_______psi)
A) 193kPa or 28psi
List 4 fuel gases used for heating and cutting
Acetylene, propane, natural gas, propylene
List two methods used for storing oxygen
- As a liquid in a cryogenic container like a thermos bottle
- Stored as a gas in high-pressure cylinders
Name the safety device used on oxygen cylinders and what is its bursting pressure?
It is a metal rupture disc that has a bursting pressure of about 22,000 kPa or 3200 psi
Compare the pressures and contents of a full-size oxygen cylinder with a half size cylinder
The pressure is the same for both cylinders, but the volume of the gas in the half side cylinder is half that of the full-size cylinder
Explained why fuel gas cylinders have left-hand threads and non-fuel gas cylinders have right hand threads
It’s a safety feature that insures the equipment is not interchanged or hooked up incorrectly
Explain why an acetylene cylinder is filled with a porous material
The porous material prevents a large volume of free acetylene gas from accumulating under high-pressure to keep the acetylene stable
State the location and purpose of fusible metal plugs
Fusible plugs are located on the top and bottom of acetylene cylinders in case of fire. They melt at approximately 100°C or 212°F, providing a controlled release of gas, which helps to prevent an explosion of the cylinder
State two safety precautions used to prevent acetone loss
- Keep acetylene cylinders in vertical positions during storage and use.
- Do not exceed the draw limit.
What should be done before the cylinder valve protective caps are removed?
A) cylinder should be pressure tested
B) cylinder should be secured
C) cylinder valve should be cracked
D) equipment should be lubricated and ready for installation
B) cylinder should be secured
In order to protect the regulator gauges from being damaged
A) only use regulators with a preset stage
B) release the adjusting screw before you open the cylinder valve
C) engage the adjusting, screw to allow unrestricted gas flow
D) use only gauges equipped with heavy duty bourdon tubes
B) release the adjusting screw before you open the cylinder valve
Which type of regulator fitting requires a fibre washer
A flat faced fitting found on some acetylene regulator/cylinder valves
Why are cylinder valves cracked before the regulators are attached?
To remove dust or dirt from the cylinder valve