Welding > test2oxyfuel equiptment > Flashcards

test2oxyfuel equiptment Flashcards

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1
Q

Oxyfuel equipment

A
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2
Q

Oxygen produced by air liquefaction

A

for the purpose of welding and cutting is 99.5% pure

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3
Q

Maximum safe working pressure of acetylene

A

is 15 psi

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4
Q

Heat content or value of gasses

A

are measured ib units called BTU british thermal units

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5
Q

Propane (C3H8)

A

is used regularly for oxygen cutting because of its availability and low cost

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6
Q

Propane and propylene

A

may be better choices than acetylene for cutting materials greater than 6inch

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7
Q

Put MT

A

on empty cylinders

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8
Q

All oxygen connects

A

have right hand threads

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9
Q

Metal rupture disc in oxygen tank

A

ruptures at 3200PSI

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10
Q

Acetylene has fusible plug

A

filled with porous material because acetylene under pressure and above 103KPA (15PSI) is an unstable

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11
Q

Acetylene fusible plug melts

A

at 100 degrees

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12
Q

To stabilize high amounts of acetylene

A

you must mix it with a liquid called acetone similar odor to garlic

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13
Q

Acetylene gas on manifold

A

/ all bottles must maintain equal pressure

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14
Q

Acetylene manifold systems

A

are equipped with one way check valves but they can malfunction, never assume the czech vales will stop the flow of gas from one cylinder to another

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15
Q

Store cylinders

A

in cool dry well vented area

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16
Q

One stage regulators

A

are used where slight changes in delivery pressure( due to decreasing cylinder pressure or temperature) would adversely affect the performance characteristics of the work at hand, single stage regulators are most common for individual oxyfuel outfits or on fuel gas distribution pipeline station outlets

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17
Q

Two stage regulators

A

typical applications for a two stage regulator include the main or master regulators on a manifold systems, gas feeding to sensitive instrumentation or experimental lab conditions

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18
Q

Oxyfuel hose size

A

3/16, ¼,⅜

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19
Q

Oxygen hose

A

green fuel gasses red acetylene

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20
Q

Mixers serve two purposes

A

to thoroughly mix the oxygen and fuel gas and to act as a heat sink that reduces the risk of a flashback

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21
Q

Which gas is produced by air liquefaction process

A

Oxygen

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22
Q

Why is oxygen so deadly

A

Oxygen readily supports combustion and may act violently with some materials

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23
Q

Oxygen must be 99.5% pure

A

for efficient cutting operations

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24
Q

Oil or grease in contact with pure oxygen

A

can react violently

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25
How is acetylene gas produced
by mixing calcium carbide with water in an acetylene generator
26
Acetylene pressures
the critical pressure is 193KPA (28PSI) The maximum safe working pressure is 103KPA (15PSI) The explosive limit in air is from 2.5% to 80% The explosive limit in pure oxygen is from 3% to 93%
27
Four fuel gasses for heating and cutting
propane,acetylene, natural gas, propylene
28
Two methods for storing oxygen
the must be stored as liquid in a cryogenic container / they must be stored as gas in high pressure cylinders
29
Safety device on oxygen cylinders
metal rupture disc busting point 3200 psi
30
Compare the pressure and contents of a full size oxygen cylinder with a half size cylinder
the pressure is the same for both cylinders but the volume of gas in the half sized cylinder is half that of the full sized cylinder
31
Why do fuel gas cylinders have left hand threads
safety feature so nothing else gets put onto it
32
Why is acetylene filled with porous materials
to prevent large amounts of free acetylene gas from accumulating under high pressure to keep it stable
33
Fusible plug located on top and bottom of acetylene cylinders
incase of fire they melt at approx 100c (212F)
34
Prevent acetone loss
keep acetylene bottle stored upright don't exceed draw limit
35
Which type of regulator fitting requires a fibre washer
a flat faced fitting found on some acetylene regulator cylinder valves
36
Why are cylinder valves cracked before regulator is hooked up
to clear out dust debris
37
Why are regulators used for oxyfuel cutting heating
they reduce main source pressure to a working pressure and maintain constant delivery pressure
38
What pre cation is taken when regulators are stored for long periods of time
turn in the working pressure adjustment screw enough to releasee the spring pressure on the diagrahm to move the valve stem of the valve seat
39
Single stage regulators
reduce source pressure to working pressure in one step/ two stage regulators reduce source pressure to working pressure in two steps
40
How to safely repair acetylene hose
cut out damaged area splice using CGA approved fittings of yellow brass or iron or steel
41
Fuel gas fittings
have left hand threads
42
Difference between backfire and backlash
a backfire occurs in the mixer and tip/ a flashback occurs beyond the mixer into the hose and regulator on the low pressure side
43
Backfire causes
to little gas speed , gas flow obstruction, a hot tip
44
Backlash causes
grosley unequal pressures, tip obstruction, failing to purge the lines, faulty manipulation of valves
45
What is a burnback
a burnback combustion that takes place steadily in the tip and mixer of torch
46
Purge lines to prevent flashback
get rid of any air or explosive mixture that may be present
47
Define speed of flame propagation
48
critical pressure for acetenyl
193 kpa 28psi
49
maximum safe working pressure for acetylene
15 psi 103kpa
50
the acetylene explosive limit in air is from
2.5% to 80%
51
the explosive limit in pure oxygen is
3.0% to 93%
52
acetylene withdrawal rate should never exceed
1/7th of cylinders volumetric capacity
53
fusible plug on acetylene melts at
100c 212f
54
acetylene generator needs what to make acetylene
calcium carbide and water
55
all oxygen connections have
right hand threads
56
flashback arrestors do what
prevent the flames from travelling in gases back from the torch handle to the regulator
57
creep is when
the valve on the high pressure side of the regulator does not seat properly
58
burnback occurs when
when combustion takes place steadily in the tip and mixer
59
backfires caused by
in proper set gasses, holding tip to close to work, dirty tip, lose or faulty seat connections between handle and mixer
60
flashbacks happen when
pressure is grossly unequal, backs one gas up into the other hose creating a bomb, faulty manipulation of valves
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