*TB 17- Portable Cutting Torches

Question 1

Oxy-acetylene cutting torch:
When cutting metal 1”-2” thick, the oxygen pressure is set to ___ psi and the acetylene pressure is set to ____.
This will provide ____ minutes of working time.

Answer 1

• 60 psi oxygen, 7 psi acetylene

* 9min working time

Question 2

Oxy-acetylene cutting torch:

Acetylene hose connections at the torch and regulator are ____ (left/right hand?) threads.

Answer 2

Left hand threads

Other devices (oxygen connections) are right hand threads

Question 3

Oxy-acetylene cutting torch:
When setting up the cutting torch, how far open should the oxygen cylinder be? How far open should the acetylene cylinder be?

Answer 3

• oxygen all the way open

* acetylene 1 1/2 turns, no more

Question 4

When lighting the oxy-acetylene torch:
•How far should you open the torch-oxygen valve?
•How far should you open the torch-acetylene valve?

Answer 4

• torch O2 all the way

* torch acetylene 1/8” turn

Question 5

Oxy-acetylene torch:

What is the shutoff procedure for the cutting torch?

Answer 5

Close in order:

1. Cutting-oxygen valve/handle
2. Torch-acetylene valve
3. Preheat-oxygen valve
4. Torch-oxygen valve

Question 6

Oxy-acetylene cutting torch:

When the flame goes out with a sharp snap or pop this is known as?

Answer 6

Backfire

Question 7

Oxy-acetylene torch:

What are the common causes for the torch to backfire?

Answer 7

• incorrect operating pressures
• touching the metal with the nozzle
• loose nozzle or dirt on the nozzle seat

Question 8

Oxy-acetylene torch:

What is it called when the flame burns back inside the torch, usually with a shrill hissing or squealing.

Answer 8

Flashback

Question 9

Oxy-acetylene torch:
When operating with the cutting torch and a backfire or flashback occurs, what two valves should you shut off while you troubleshoot?

Answer 9

• preheat oxygen valve

* torch-acetylene valve

Question 10

The oxy-acetylene cutting torch assembly is to be carried on the apparatus with the cylinders in a _____ (horizontal/vertical?) position

Answer 10

Vertical

If stored horizontal the acetone solvent may be delivered to the torch when used, causing improper operation

Question 11

Oxy-acetylene torch:

To clean the cutting tip and prevent clogging, use the #____ tip cleaner for the preheat hole.

Answer 11

8

Question 12

Oxy-acetylene torch:

To clean the cutting tip and prevent clogging, use the #____ tip cleaner for the cutting holes.

Answer 12

22

Question 13

Oxy-acetylene cutting torch:
When cutting metal 0”-1” thick, the oxygen pressure is set to ___ psi and the acetylene pressure is set to ____.
This will provide ____ minutes of working time.

Answer 13

• 35psi oxygen, 7psi acetylene

* 15min working time