Oxy-fuel1
What is a common cause of backfire?
Touching the torch tip to the hot work piece?
What is a concern when using hydrogen as fuel gas?
Transparent flame.
T type oxygen cylinders are filled to how many kpa or PSI?
2600 PSI or 18000 kpa.
True/false Pressure in a cylinder will change with change of temperature.
True
What is the safety device on an oxygen cylinder?
Rupture disk
What should be done with a leaking or damaged cylinder?
Call the supplier. Marked with warning label. Move to a well ventilated area.
Acetylene is unstable above what pressure?
15 PSI
What is the result of cleaning an oxy-fuel tip using a bending or twisting motion?
The orifice will become flared.
Which regulation determines the capacity limits and locations for oxygen manifold systems?
NFPA 51
What is required for all acetylene manifold systems?
Hydraulic flashback arrestors.
What type of machine is used for cutting pipe.
Machine beveller
What is the purpose of a manual cutting guide?
Control the position of the torch
Where are the flashback arrestors required when the torch does not have them built-in?
At either end of the gas hose.
What is done before connecting the gas hoses when assembling oxy-fuel equipment for a cutting job?
Install the flashback arrestors
what is the purpose of cracking a cylinder valve?
To clean debris from the outlets.
What is done when a regulator does not fit on the cylinder?
Check for the correct threads.
What is done first when shutting down an oxy-fuel cutting system?
Close the torch valves .
What is the result on a workpiece when the travel speed is too fast while oxyfuel cutting?
Excess slag on the bottom edge.
What is acetylene dissolved in to help stabilize it?
Acetone
You do not want to draw acetone into the system because?( 3 things)
Damage the regulator .Contaminate the flame.Damage the hoses.
What happens to an oxy-fuel cut when the cutting tip is too large?
Bell shaped kerf
Which push angle is used for oxy-fuel cutting sheet metal?
10 to 20 degrees off the base metal
What is the distance the cutting torch tip should be held at from the surface of the base metal while oxy-fuel cutting?
1/16 to1/8 inches or 1.5 to 3 mm
Which cut characteristic is caused when the preheat holes do not follow the line of the cut while preforming a straight cut?
Irregular kerf
How far should an acetylene valve be opened?
1 to 1.5 turns