OAW

Question 1

Acetylene is unsafe at what pressure?

Answer 1

15 PSI

Question 2

Pure Oxygen must not come in contact with what substance?

Answer 2

Oil, Grease

Question 3

What is the temperature of a neutral flame?

Answer 3

3087 Celsius

5589 F

Question 4

A loud sharp inner cone represents what type of flame

Answer 4

Oxidizing Flame

Question 5

A quiet single inner cone represents what type of flame

Answer 5

Neutral Flame

Question 6

Acetylene uses what type of threads?

Answer 6

Left Hand

Question 7

Oxygen Uses what type of threads?

Answer 7

Right Hand

Question 8

How far should you open a double seating valve to prevent leaks around the valve stem.

Answer 8

Fully Opened

Question 9

When is the only time a cylinder cap can be off a pressurized gas cylinder?

Answer 9

When in use

Question 10

What is the purpose of a fusible plug

Answer 10

to prevent acetylene cylinders from exploding due to pressure increasing during a fire. Fuse plugs will melt and release the pressure.

Question 11

What is a backfire?

Answer 11

a flame inside a OAW torch tip

Question 12

What is a flashback?

Answer 12

a flame in the lines and hoses of an OAW station.

Question 13

Where is the safest place to stand when opening a pressurized gas cylinder?

Answer 13

The tank side, place yourself on the opposite side of the regulator.

Question 14

What is an acceptable device to ignite an acetylene torch?

Answer 14

A spark lighter

Question 15

How far should you open an acetylene cylinder that uses a valve wrench?

Answer 15

1/4 turn

Question 16

Oxygen cylinders utilize which safety device?

Answer 16

Burst Disc

Question 17

Fusible plugs melt at what temperature?

Answer 17

100 Celsius or 212F

Question 18

What rate can you safely draw off acetylene from a cylinder?

Answer 18

1/7 the tanks volume per hour

Question 19

Clothes that have been saturated with oxygen should be removed and not worn for how long?

Answer 19

30 minutes

Question 20

What does the 45 mean in an RG 45 Rod.

Answer 20

Tensile Strength 45 000 PSI

Question 21

What safety devices are found in a Flashback Arrestor?

Answer 21

Check Valve, Stainless Steel Screen, Pressure Sensitive Valve, Heat Sensitive Valve

Question 22

Cracking a valve is done to ensure what? What must you ensure when cracking a fuel cylinder valve?

Answer 22

To prevent dust and particulates from entering a regulator when changing a cylinder.
That no open flame or sparks are around.

Question 23

The flame should always be BLANK when not in your hands?

Answer 23

Off.

Question 24

Oxygen cylinders utilize what safety device?

Answer 24

Burst disc

Question 25

Acetylene cylinders utilize what safety device?

Answer 25

Fusible Plugs

Question 26

What factors effect the rate at which you can draw off acetylene from a cylinder?

Answer 26

Temperature, Charge remaining (how full vs. how empty), number of cylinders in use.

Question 27

What materials are inside an acetylene cylinder?

Answer 27

Acetone, monolithic porous material (massively uniform)

Question 28

What material should not be used for an acetylene manifold?

Answer 28

Copper, it produces an unstable gas known as copper Acetylide.

Question 29

Acetylene and oxygen cylinders should be separated by a wall with a burn rating of how long?

Answer 29

minimum of one half hour 1/2Hr

Question 30

What is in a Flashback arrestor?

Answer 30

a one way check valve, heat sensitive check valve, pressure sensitive check valve, stainless steel screen filter.