NGA 70 - PROPERTIES OF NATURAL GAS AND ABNORMAL OPERATING CONDITIONS QUESTIONS WELL ANSWERED LATEST 2026

NGA 70 - PROPERTIES OF NATURAL GAS AND ABNORMAL OPERATING CONDITIONS QUESTIONS WELL ANSWERED LATEST 2026 Aldehydes - Answers A toxic substance formed from incomplete combustion Carbon Monoxide - Answers A dangerous byproduct of incomplete combustion of natural gas City Gate - Answers 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 Combustion - Answers The three requirements of combustion are fuel, oxygen, and an ignition source Compressor Station - Answers Machine that compresses the gas to a higher pressure, to make up for the pressure drop through the length of the pipeline. Three types of Compressor stations: Production, Storage, Transmission Emergency Shutdown System (ESD) - Answers In the event of an emergency situation, such as leaking gas, the emergency shutdown system turns off the station and isolates the pipeline by automated valves Excess Flow Valve - Answers A valve inserted in a service line designed to shut off the flow positively in the event its predetermined flow is exceeded Heaters - Answers 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 Hydrocarbon - Answers The combination of the elements hydrogen and carbon that make up the basic elements of oil, natural gas, and coal Ignition Temperature - Answers The temperature at which a substance will ignite. The ignition temperature of natural gas is about 1100F to 1200F Meter - Answers 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 Odorants - Answers Natural Gas has little or no odor and no color, so a odorant is added to aid leak detection Mercaptan - Answers Rotten Egg odor, chemical added to natural gas to assist in detecting gas leaks Pressure Regulator - Answers Equipment placed in the gas line for reducing, maintaining, and controlling the gas pressure in that portion of the piping system downstream of the equipment Range of flammability (definition) - Answers The range which gas will burn. The range of flammability for natural gas-air mixtures is approx. 5% to 15% natural gas Regulating Station - Answers Reduces the pressure and measures the quantity of gas received from the distribution pipeline and prepares it by putting in odorants into the gas stream for consumers. Service Line - Answers A pipe that transports gas from a common source of supply to a meter set assembly Service Regulator - Answers 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 Specific Gravity - Answers The weight of gas compared to weight of air. The specific gravity of natural gas is 0.6 Station By-Pass - Answers Takes over gas flow by maintaining it in the event of emergency shutdown The typical specific gravity of natural gas is, 0.60 or 1.55? - Answers 0.60 The presence of ______ in natural gas distinguishes it from other combustible gases or gases from decaying material, such as sewer gas - Answers Ethane If not enough air is supplied to the gas burner, incomplete combustion will occur, resulting in the increased formulation of - Answers Carbon Monoxide snd Aldehydes What is required for combustion of natural gas to occur? - Answers Oxygen, heat/ignition source, fuel The most common indication of a gas leak is - Answers Gas Odor If gas is leaking from a pipeline under frozen soil, the gas typically migrates what directions? - Answers Horizontally and Vertically Odor fading may be caused by chemical instability of the odorant or _____ ? - Answers Absorption into the pipeline What are potential causes of overpressurization? - Answers Flooding, Employee Error, Cut or Damaged Control Line, Vandalism Ignition Temperature of Propane - Answers 874F Ignition Temperature of Butane - Answers 806F Ignition Temperature of Gasoline, Kerosene, and Fuel Oil - Answers 490F What is the primary mixture of natural gas? - Answers 90%-95% Methane Specific Gravity of Carbon Monoxide - Answers 0.98 Specific Gravity of Air - Answers 1.0 Specific Gravity of Propane - Answers 1.56 Specific Gravity of Gasoline - Answers 3.5 Specific Gravity of Kerosene/Fuel Oil - Answers 4.5 Physical Characteristics of Natural Gas - Answers Matter, Weight, Nontoxic Colorless, Odorless When Propane, Gasoline, or Fuel Oils are released into the atmosphere where do they settle and accumulate near? - Answers The ground or bottom of an excavation DOT Regulation 192.605 : Procedural Manual of Operations, Maintenance, and Emergencies - Answers Each operator shall prepare and follow for each pipeline, a manual of written procedures for conducting operations and maintenance activities and for emergency response. For transmission lines, the manual must also include procedures for handling abnormal operations. This manual must be reviewed and updated by the operator at intervals not exceeding 15 months, but at least once each calendar year. DOT Regulation 192.615 : Emergency Plans - Answers Each operator shall establish written procedures to minimize the hazard resulting from a gas pipeline emergency DOT Regulation 192.616 : Public Awareness - Answers each pipeline operator must develop and implement a written continuing public education program that follows the guidance provided in the American Petroleum Institute's (API) Recommended Practice (RP) 1162 DOT Regulation 192.751 : Prevention of Accidental Ignition - Answers Each operator shall take steps to minimize the danger of accidental ignition of gas in any structure or area where the presence of gas constitutes a hazard of fire or explosion DOT Regulation 192.803 : Definitions - Answers Abnormal operating condition means a condition identified by the operator that may indicate a malfunction of a component or deviation from normal operations that may result in a hazards to persons, property, or the environment When Reporting a Accident, who do you report to and what is the minimal information that should be given? - Answers Notify your immediate supervisor and a central reporting organization appointed by company. The minimal information given on the reported incident should be; Names of Operators and Persons making report and their telephone number, Location of the incident, Time of the incident, The number of fatalities and personal injuries (if any), All other significant facts that are relevant to the cause of the incident or extent of damages. AOC - Answers Abnormal Operating Condition