TASK 70, 71, 6-8A QUESTIONS &
SOLUTIONS
What is an AOC? - ANSWERAbnormal Operating Conditions: A condition identified by
the operator that may indicate a malfunction of a component or deviation from normal
operations that may indicate a condition exceeding design limits or result in a hazard to
persons, property or the environment
What is Task 70? - ANSWERProperties of Natural Gas and Abnormal Operating
Conditions
What makes up 96% of Natural gas? - ANSWERMethane makes up about 95% of
Natural Gas
What is added by gas companies to give gas a distinct smell?
What does National Grid use specifically? - ANSWEROdorants are added by gas
companies to give gas a distinct smell
National Grid uses mercaptan to make sure people can smell gas
Does Natural gas expand or contract when heated? - ANSWERNatural gas expands
when heated
Does Natural gas expand or contract when cooled? - ANSWERNatural gas contracts
when cooled
If improper odorization is found, what steps need to be taken? (5) - ANSWER1. Perform
leak investigation with CGI to identify migrating gas
2. Keep public a safe distance away
3. Advise dispatch and/or assigned field rep
4. Contact pressure department
5. Eliminate ignition sources
What are some examples of improper odorization? - ANSWER- No smell at an obvious
leak
- Very strong odor in the area
- Burnt vegetation with obvious leak and no odor
How does Natural gas flow? - ANSWERNatural gas flows from high pressure to low
pressure
What color appearance should properly combusting natural gas have? -
ANSWERProperly combusting natural gas should have a blue appearance
SOLUTIONS
What is an AOC? - ANSWERAbnormal Operating Conditions: A condition identified by
the operator that may indicate a malfunction of a component or deviation from normal
operations that may indicate a condition exceeding design limits or result in a hazard to
persons, property or the environment
What is Task 70? - ANSWERProperties of Natural Gas and Abnormal Operating
Conditions
What makes up 96% of Natural gas? - ANSWERMethane makes up about 95% of
Natural Gas
What is added by gas companies to give gas a distinct smell?
What does National Grid use specifically? - ANSWEROdorants are added by gas
companies to give gas a distinct smell
National Grid uses mercaptan to make sure people can smell gas
Does Natural gas expand or contract when heated? - ANSWERNatural gas expands
when heated
Does Natural gas expand or contract when cooled? - ANSWERNatural gas contracts
when cooled
If improper odorization is found, what steps need to be taken? (5) - ANSWER1. Perform
leak investigation with CGI to identify migrating gas
2. Keep public a safe distance away
3. Advise dispatch and/or assigned field rep
4. Contact pressure department
5. Eliminate ignition sources
What are some examples of improper odorization? - ANSWER- No smell at an obvious
leak
- Very strong odor in the area
- Burnt vegetation with obvious leak and no odor
How does Natural gas flow? - ANSWERNatural gas flows from high pressure to low
pressure
What color appearance should properly combusting natural gas have? -
ANSWERProperly combusting natural gas should have a blue appearance
