OQ TESTING QUESTIONS AND
ANSWERS
Abnormal Operating Condition (AOC)
a condition identified by the operator that may indicate a malfunction
Natural Gas
-Non-toxic
-Odorless
-Colorless
-Can be transported by gas or liquid
-Clean burning blue flame
What is the gravity of Natural Gas?
0.6
When in a confined space natural gas can...
displace oxygen causing headaches, dizziness, and loss of consciousness
The additive gives natural gas a rotten eggs smell
Mercaptan
Odour intensity from a gas leak depends on what material it passes through (soil
type)
.
Odor Fade
When the odor is reduced
-can be absorbed into the rust deposits of steel piping
-and can be absorbed into the interior surface of plastic piping
Methane
Primary component of Natural Gas (Largest percentage)
, Ethane
indicates or distinguishes Natural Gas from other gases
DO NOT use telemeter to gage odor fading - used for pressure
.
They raise gas temp before reducing pressure to keep it above 32 degrees - if
fall below 32 a frost ball of frozen soil can form causing stress on pipes
.
Combustion
-Chemical reaction
-Fuel, oxygen, and ignition
Gas will only burn between 5%-15%
LEL - 5%
UEL - 15%
Complete Combustion
the perfect mixture of fuel and air (clean blue flame)
Incomplete Combustion
Orange flame and improper mixture (carbon monoxide & aldehydes present)
CO2 (carbon monoxide)
colorless, odorless, tasteless, and deadly in any amount
Natural Gas ignition temp 1100F
.
Ignition sources
doorbell, static, cell phones, engines, etc.)
Gas leak signs
SMELL (MOST POPULAR)
-odorant of mercaptan (rotten eggs)
ANSWERS
Abnormal Operating Condition (AOC)
a condition identified by the operator that may indicate a malfunction
Natural Gas
-Non-toxic
-Odorless
-Colorless
-Can be transported by gas or liquid
-Clean burning blue flame
What is the gravity of Natural Gas?
0.6
When in a confined space natural gas can...
displace oxygen causing headaches, dizziness, and loss of consciousness
The additive gives natural gas a rotten eggs smell
Mercaptan
Odour intensity from a gas leak depends on what material it passes through (soil
type)
.
Odor Fade
When the odor is reduced
-can be absorbed into the rust deposits of steel piping
-and can be absorbed into the interior surface of plastic piping
Methane
Primary component of Natural Gas (Largest percentage)
, Ethane
indicates or distinguishes Natural Gas from other gases
DO NOT use telemeter to gage odor fading - used for pressure
.
They raise gas temp before reducing pressure to keep it above 32 degrees - if
fall below 32 a frost ball of frozen soil can form causing stress on pipes
.
Combustion
-Chemical reaction
-Fuel, oxygen, and ignition
Gas will only burn between 5%-15%
LEL - 5%
UEL - 15%
Complete Combustion
the perfect mixture of fuel and air (clean blue flame)
Incomplete Combustion
Orange flame and improper mixture (carbon monoxide & aldehydes present)
CO2 (carbon monoxide)
colorless, odorless, tasteless, and deadly in any amount
Natural Gas ignition temp 1100F
.
Ignition sources
doorbell, static, cell phones, engines, etc.)
Gas leak signs
SMELL (MOST POPULAR)
-odorant of mercaptan (rotten eggs)
