# 5 oxyacetylene heating and cutting

Question 1

Oxygen is required to produce

Answer 1

highest quality flame

Question 2

grease can explode

Answer 2

when exposed to pure oxygen under pressure

Question 3

oxygen cylinder pressure

Answer 3

over 2000 psi

Question 4

what thread on oxy cylinder

Answer 4

right hand(external)

Question 5

oxy has frangible disc what pressure will it fail

Answer 5

3200 psi

Question 6

oxy tank valve must backseated

Answer 6

be opened fully to prevent leakage

Question 7

Acetylene is very unstable when compressed

Answer 7

beyond 15 psi

Question 8

acetylene is

Answer 8

colorless and has garlic smell

Question 9

Acetylene wieghs

Answer 9

approx same as air and collects in pockets

Question 10

Acetylene can be stored at

Answer 10

250psi in its tank

Question 11

Acetylene must be stored

Answer 11

verticle/upright because of liquid acetone

Question 12

Acetylene draw limit is

Answer 12

no more than 1/7 per hour

Question 13

Acetylene bottles have a fuseable plug and melt

Answer 13

at 100 degrees celcius.may be in neck,bottom, fill passage and shoulder

Question 14

What thread on Acetylene cylinders

Answer 14

Left hand thread(internal)

Question 15

Only open Acetylene tank valve

Answer 15

less than a turn

Question 16

LPG will displace

Answer 16

oxygen in the blood stream

Question 17

LPG is 1.55 SG and will

Answer 17

accumulate in low lying areas

Question 18

LPG will vaporize when

Answer 18

increase in temp or decrease in pressure

Question 19

LPG expands to

Answer 19

270 times its size in propane gas

Question 20

At 0 deg celcius LPG

Answer 20

would be in a liquid state 0 psi

Question 21

ignition point is

Answer 21

lowest temp at which fuel will spontaneously ignite

Question 22

LPG must not be filled beyond

Answer 22

80% allows for expansion

Question 23

LPG cylinders must be

Answer 23

stored or shipped upright

Question 24

Oxy Acetylene regulators will provide

Answer 24

steady and accurate pressure

Question 25

name the 2 gauges

Answer 25

Cylinder pressure and regulated pressure

Question 26

which direction increases pressure on adj screw

Answer 26

cw rotation

Question 27

min hose burst pressure

Answer 27

400 psi

Question 28

one way check valves prevent

Answer 28

mixing of acet and oxy in hoses

Question 29

needle valves on torch handle allow

Answer 29

for fine adjustments of oxy acety

Question 30

crack valves to

Answer 30

blow out dust and dirt

Question 31

heating tip regulator settings (approx)

Answer 31

5 psi and equal on oxy regulator

Question 32

rosebud tips for

Answer 32

intense heating

Question 33

flat file tips first because

Answer 33

creates bur, then clean

Question 34

neutral falme for

Answer 34

heating and cutting

Question 35

if you change a tip you have to

Answer 35

rebalance the torch

Question 36

slow gas flow can cause

Answer 36

backfire

Question 37

flashbacks caused by

Answer 37

extreme unequal pressure,failure to purge, mild unequal and blockage,lighting with both valves open

Question 38

you can cut ____________ metals

Answer 38

ferrous.

Question 39

if cutting metal containing zinc, galvanized cadmiun or lead you may need

Answer 39

approved breathing regulators

Question 40

thin metals require more _______ to cut correctly

Answer 40

inclination / angle