*TB 17- Portable Cutting Torches Flashcards Preview

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Flashcards in *TB 17- Portable Cutting Torches Deck (13):
0

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.

•35psi oxygen, 7psi acetylene

•15min working time

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.

•60 psi oxygen, 7 psi acetylene

•9min working time

2

Oxy-acetylene cutting torch:
Acetylene hose connections at the torch and regulator are ____ (left/right hand?) threads.

Left hand threads

Other devices (oxygen connections) are right hand threads

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?

•oxygen all the way open
•acetylene 1 1/2 turns, no more

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?

•torch O2 all the way
•torch acetylene 1/8" turn

5

Oxy-acetylene torch:
What is the shutoff procedure for the cutting torch?

Close in order:
1. Cutting-oxygen valve/handle
2. Torch-acetylene valve
3. Preheat-oxygen valve
4. Torch-oxygen valve

6

Oxy-acetylene cutting torch:
When the flame goes out with a sharp snap or pop this is known as?

Backfire

7

Oxy-acetylene torch:
What are the common causes for the torch to backfire?

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

8

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

Flashback

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?

•preheat oxygen valve
•torch-acetylene valve

10

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

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

11

Oxy-acetylene torch:

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

8

12

Oxy-acetylene torch:

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

22

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