TB 17 - Portable Cutting Torch Flashcards
The portable oxy-acetylene torch will operate for approximately how many minutes in normal usage?
15 minutes
The cutting torch will cut metal up to how many inches thick?
2 inches
What safety equipment provided with the unit are to be used at all times while cutting?
Welding goggles and gauntlet type gloves
Another member is to stand by with what to protect operator and watch for adjacent ignition?
Suitable extinguisher
Do not cut into an area containing what?
Combustible gases
Flammable liquids
You should avoid inhalation of smoke released from cutting particularly what plated materials?
Cadmium or lead
Do not use what on this to as it easily ignites and burns violently in the presence of oxygen under pressure?
Oil and grease
For up to 1” of metal set the oxygen pressure and acetylene pressure to what psi for a max of how much working time?
Oxygen: 35 psi
Acetylene: 7 psi
15 mins working time
For 1”-2” of metal set the oxygen pressure and acetylene pressure to what psi for a max of how much working time?
Oxygen: 60 psi
Acetylene: 7 psi
9 minute working time
Open the cylinder valve how much (“cracking”) and then close it to blow away any dust or dirt which may have accumulated in valve outlet?
Slightly for an instance
All oxygen connections and acetylene cylinder valves for regular connection have which handed threads?
Right hand
Acetylene hose connections at torch and regulator have what handed threads?
Left handed
Attach the regulator to the cylinder valve and tighten what but securely with a wrench?
Union nut
Make sure the pressure adjusting screw is released by turning the regulator handle in what direction until it will turn no further?
Left (counterclockwise)
To avoid accessible discharge of acetone, the cylinder should not be opened or used with the valve at what height of the body of the cylinder?
Lower
Open acetylene cylinder valve how many turns?
1 1/2 turns
Open the oxygen cylinder valve how many turns?
Fully
Never stand where of regulator when opening a cylinder valve?
In front of back
Always leave the key wrench in place on the valuable of which cylinder when it is in use?
Acetylene
When lighting the torch, open the oxygen valve on torch how much?
Fully
When lighting the torch open the acetylene cylinder valve on torch how much?
1/8 turn
When lighting open the preheat oxygen valve how much?
Fraction of a turn
After lighting torch, adjust preheat valance until flame is clean, with the inner cone how sharp, neutral flame?
Cone sharp and to a point
Once torch is lit, open the cutting oxygen valve (depress lever) and if necessary adjust what?
Flame
If the flame burns away from the end of nozzle or blows off, decrease the what valve opening and immediately relight cutting torch, adjust preheat oxygen valve to obtain a neutral flame?
Acetylene valve
When shutting off the torch, in what order do you close the valve on the torch?
Cutting oxygen valve
Torch acetylene valve
Preheat oxygen valve
Torch oxygen valve
When flame goes out with a sharp snap or pop common causes are what?
Incorrect operating pressures
Touching metal with nozzle
Loose nozzle or dirt on seat of nozzle
If a backfire occurs (flame goes out), close which valves and delight after trouble has been located and corrected?
Preheat oxygen valve
Torch acetylene valve
For flashback, when the flame burns back inside the torch what type of sound will you usually hear?
Shrill hissing or squealing
If flashback occurs, immediately close which valves?
Preheat oxygen valve
Torch acetylene valve
After relighting torch, if flashback occurs, send torch in for what?
Repair or replacement
The cutting torch assembly is be carried on apparatus with the cylinders in what position?
Vertical position
For checking for leaks while in quarters with a soapy water solution, always use grease free soap such as what brand?
Ivory brand
Always store the spar acetylene torch in what position because if stored in another position the acetylene solvent may be delivered to torch when used causing improper operation?
Vertical
Always keep cylinders clean and free from what because a violent explosion could occur if oxygen came in contact?
Oil and grease
Keep packing nuts right enough to avoid what?
Leakage
To clean the cutting tip and prevent clogging use which provided cleaners?
#8 preheat hole #22 cutting holes
