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43 Cards in this Set
- Front
- Back
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What do you get out of the air liquefaction process? |
Pure oxygen |
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What accelerates combustion and greatly increases flame temperature? |
Pure oxygen oxygen |
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Oxygen + oil = what? |
Explosion or fire. |
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How do you make acetylene? |
Calcium carbide + water |
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What is used to stabilize acetylene? |
Acetone |
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What is the acetylene limits in the air? |
2.5-80% |
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What is the acetylene limit in oxygen? |
3.0-93% |
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At what point does acetylene reach a critical point? |
28 PSI |
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What is the neutral flame temperature of acetylene? |
5600•F |
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Acetylene gas is the only gas that get hot enough to cut, weld and heat. True or False |
True |
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What is the ratio for acetylene:oxygen:fuel ratio |
1.1:1 |
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What does cryogenic mean |
Very low temperature |
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What are liquid oxygen tanks often called? |
Mini-bulk container |
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Internal pressure of liquid oxygen keeps the temperature of the remaining liquid at what temperature? |
-297•F |
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How are oxygen cylinders formed? |
Hot drawn |
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What do you mark on the cylinder when it is empty? |
MT |
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To get an accurate reading on a cylinder of oxygen it must be read at what temperature? |
21•C |
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The metal rupture disc bursts at what PSI? |
3200 PSI |
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What is the safety feature of an oxygen tank? |
Metal rupture disc |
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Acetylene when stabilized with acetone smells like what? |
Garlic |
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What is the safety feature in acetylene cylinders? |
Fusible metal plugs |
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Acetone is pumped into an acetylene cylinder until ____% of its volumetric capacity is reached? |
40% |
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Where is the weight stamped on the cylinder? |
The shoulder |
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The filler in an acetylene cylinder is how porous? |
90-92% |
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How many times do you turn an acetylene bottles handle to start the flow of gas? |
1-1 1/2 turns |
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At what temperature do fusible plugs melt? |
100•C |
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Where are the fusible plugs on an acetylene cylinder located? |
Two on the top of the bottle and two on the bottom |
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What is the draw limit of an acetylene cylinder? |
1/7 of its volumetric capacity per hour |
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What are manifold systems used for? |
When there is a need for drawing off large volumes of acetylene, oxygen or other gases by connecting to several cylinders simultaneously. |
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What is a big safety feature of a manifold system? |
Flash back tank. |
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What type of brass should you NOT use with acetylene gas? |
Copper or Red |
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What is the correct PSI of Oxygen and Acetylene for cutting? |
30psi oxygen and 3psi acetylene. |
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In what order do you purge the lines of your torch? |
Oxygen then acetylene |
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The three main working parts of the regulator are? |
The spring The diaphragm The valve/ seat assembly |
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Regulators are classified into what 4 ways |
Service- oxygen or acetylene and type- single-stage or two-stage. |
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What’s the maximum safe working pressure of acetylene? |
15 PSI |
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What happens if your acetylene PSI goes 28PSI of above? |
An explosion |
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Single stage regulators do not give as fine of a control over the delivery pressure. True or false. |
True |
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A two step regulator reduces cylinder pressure to a pre set intermediate pressure of what? |
180 psi - 400 psi |
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What is inside the gauge of a regulator? |
Bourdon tube |
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Oxyfuel hoses are made of what? |
Rubber and filler with a fabric or linen braid. |
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What is creep? |
A regulator malfunction that occurs when the valve on the high-pressure side of the regulator does not seat properly. |
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Three basic malfunctions are possible with oxyfuel equipment what are they? |
Backfires Burn backs Flash backs |
