NGA 70: Properties of Natural Gas and Abnormal Operating
Conditions Solved Correctly To Score A+ 2026
1. Aldehydes A toxic substance formed from incomplete combustion
2. Carbon Monoxide A dangerous byproduct of incomplete combustion of natural gas
3. City Gate The regulating station that reduces the pressure and measures of the
quantity of gas received from the distribution pipeline and prepares it
for consumption by the consumer by injecting a odorant into the gas
stream
4. Combustion The three requirements of combustion are fuel, oxygen, and an ignition
source
5. Compressor Machine that compresses the gas to a higher pressure, to make up for
Sta- tion the pressure drop through the length of the pipeline. Three types of
Compressor stations: Production, Storage, Transmission
6. Emergency In the event of an emergency situation, such as leaking gas, the
Shut- down emergency shutdown system turns ott the station and isolates the
System (ESD) pipeline by automated valves
7. Excess Flow Valve A valve inserted in a service line designed to shut ott the flow positively
in the event its predetermined flow is exceeded
8. Heaters Used during the processing of natural gas to keep gas from
temperature from
falling below freezing to prevent ice ball formation on pipes and
condensation within pipes
9. Hydrocarbon The combination of the elements hydrogen and carbon that make up the
basic
elements of oil, natural gas, and coal
10. Ignition Tempera- ture
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17
, NGA 70: Properties of Natural Gas and Abnormal Operating
Conditions Solved Correctly To Score A+ 2026
11. Meter The temperature at which a substance will ignite. The ignition temperature
of natural gas is about 1100F to 1200F
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17
, NGA 70: Properties of Natural Gas and Abnormal Operating
Conditions Solved Correctly To Score A+ 2026
A mechanical device which measures the volume of the gas delivered
from the operator to the customer. They are used at residential,
commercial, and industrial buildings that consume fuel gas supplied by a
gas utility
12. Odorants Natural Gas has little or no odor and no color, so a odorant is added to
aid leak
detection
13. Mercaptan Rotten Egg odor, chemical added to natural gas to assist in detecting
gas leaks
14. Pressure Equipment placed in the gas line for reducing, maintaining, and
Regula- tor controlling the gas pressure in that portion of the piping system
downstream of the equipment
15. Range of
flamma- bility The range which gas will burn. The range of flammability for natural gas-
(definition) air mixtures is approx. 5% to 15% natural gas
16. Regulating Reduces the pressure and measures the quantity of gas received from
Sta- tion the dis- tribution pipeline and prepares it by putting in odorants into the
gas stream for consumers.
17. Service Line A pipe that transports gas from a common source of supply to a meter
set
assembly
18. Service Regulator A mechanical device that controls the flow of gas at a constant
pressure to meet
downstream customers' demand. Standard delivery pressure is
normally 7 inches water column
19. Specific Gravity The weight of gas compared to weight of air. The specific gravity of natural
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17
Conditions Solved Correctly To Score A+ 2026
1. Aldehydes A toxic substance formed from incomplete combustion
2. Carbon Monoxide A dangerous byproduct of incomplete combustion of natural gas
3. City Gate The regulating station that reduces the pressure and measures of the
quantity of gas received from the distribution pipeline and prepares it
for consumption by the consumer by injecting a odorant into the gas
stream
4. Combustion The three requirements of combustion are fuel, oxygen, and an ignition
source
5. Compressor Machine that compresses the gas to a higher pressure, to make up for
Sta- tion the pressure drop through the length of the pipeline. Three types of
Compressor stations: Production, Storage, Transmission
6. Emergency In the event of an emergency situation, such as leaking gas, the
Shut- down emergency shutdown system turns ott the station and isolates the
System (ESD) pipeline by automated valves
7. Excess Flow Valve A valve inserted in a service line designed to shut ott the flow positively
in the event its predetermined flow is exceeded
8. Heaters Used during the processing of natural gas to keep gas from
temperature from
falling below freezing to prevent ice ball formation on pipes and
condensation within pipes
9. Hydrocarbon The combination of the elements hydrogen and carbon that make up the
basic
elements of oil, natural gas, and coal
10. Ignition Tempera- ture
1/
17
, NGA 70: Properties of Natural Gas and Abnormal Operating
Conditions Solved Correctly To Score A+ 2026
11. Meter The temperature at which a substance will ignite. The ignition temperature
of natural gas is about 1100F to 1200F
2/
17
, NGA 70: Properties of Natural Gas and Abnormal Operating
Conditions Solved Correctly To Score A+ 2026
A mechanical device which measures the volume of the gas delivered
from the operator to the customer. They are used at residential,
commercial, and industrial buildings that consume fuel gas supplied by a
gas utility
12. Odorants Natural Gas has little or no odor and no color, so a odorant is added to
aid leak
detection
13. Mercaptan Rotten Egg odor, chemical added to natural gas to assist in detecting
gas leaks
14. Pressure Equipment placed in the gas line for reducing, maintaining, and
Regula- tor controlling the gas pressure in that portion of the piping system
downstream of the equipment
15. Range of
flamma- bility The range which gas will burn. The range of flammability for natural gas-
(definition) air mixtures is approx. 5% to 15% natural gas
16. Regulating Reduces the pressure and measures the quantity of gas received from
Sta- tion the dis- tribution pipeline and prepares it by putting in odorants into the
gas stream for consumers.
17. Service Line A pipe that transports gas from a common source of supply to a meter
set
assembly
18. Service Regulator A mechanical device that controls the flow of gas at a constant
pressure to meet
downstream customers' demand. Standard delivery pressure is
normally 7 inches water column
19. Specific Gravity The weight of gas compared to weight of air. The specific gravity of natural
3/
17
