OAW Flashcards
Acetylene is unsafe at what pressure?
15 PSI
Pure Oxygen must not come in contact with what substance?
Oil, Grease
What is the temperature of a neutral flame?
3087 Celsius
5589 F
A loud sharp inner cone represents what type of flame
Oxidizing Flame
A quiet single inner cone represents what type of flame
Neutral Flame
Acetylene uses what type of threads?
Left Hand
Oxygen Uses what type of threads?
Right Hand
How far should you open a double seating valve to prevent leaks around the valve stem.
Fully Opened
When is the only time a cylinder cap can be off a pressurized gas cylinder?
When in use
What is the purpose of a fusible plug
to prevent acetylene cylinders from exploding due to pressure increasing during a fire. Fuse plugs will melt and release the pressure.
What is a backfire?
a flame inside a OAW torch tip
What is a flashback?
a flame in the lines and hoses of an OAW station.
Where is the safest place to stand when opening a pressurized gas cylinder?
The tank side, place yourself on the opposite side of the regulator.
What is an acceptable device to ignite an acetylene torch?
A spark lighter
How far should you open an acetylene cylinder that uses a valve wrench?
1/4 turn
Oxygen cylinders utilize which safety device?
Burst Disc
Fusible plugs melt at what temperature?
100 Celsius or 212F
What rate can you safely draw off acetylene from a cylinder?
1/7 the tanks volume per hour
Clothes that have been saturated with oxygen should be removed and not worn for how long?
30 minutes
What does the 45 mean in an RG 45 Rod.
Tensile Strength 45 000 PSI
What safety devices are found in a Flashback Arrestor?
Check Valve, Stainless Steel Screen, Pressure Sensitive Valve, Heat Sensitive Valve
Cracking a valve is done to ensure what? What must you ensure when cracking a fuel cylinder valve?
To prevent dust and particulates from entering a regulator when changing a cylinder.
That no open flame or sparks are around.
The flame should always be BLANK when not in your hands?
Off.
Oxygen cylinders utilize what safety device?
Burst disc
Acetylene cylinders utilize what safety device?
Fusible Plugs
What factors effect the rate at which you can draw off acetylene from a cylinder?
Temperature, Charge remaining (how full vs. how empty), number of cylinders in use.
What materials are inside an acetylene cylinder?
Acetone, monolithic porous material (massively uniform)
What material should not be used for an acetylene manifold?
Copper, it produces an unstable gas known as copper Acetylide.
Acetylene and oxygen cylinders should be separated by a wall with a burn rating of how long?
minimum of one half hour 1/2Hr
What is in a Flashback arrestor?
a one way check valve, heat sensitive check valve, pressure sensitive check valve, stainless steel screen filter.
