NGA 35 Stopping Gas Flow on a
Pipeline QUESTIONS WITH VERIFIED
ANSWERS
two-way feed - answersThis system is a pipe that receives natural gas from more than
one direction during normal operation
bypass - answersWhat you may need to install to prevent customer outages for those
downstream from a gas stop on a one-way feed system
valves - answersmay be used on both plastic & metallic pipe to control the gas flow
through piping systems
squeezing off pipe - answersusing a valve to stop gas flow on a main is faster than
stopping or
inflatable gas bag - answersUsing this to stop a gas flow on a pipeline is restricted to
low-pressure systems
coupon - answersinstall a retrieval tool after the hot tapping process to remove this if it
was not removed during the process
bonding cable - answersjoin the launch cylinder to the pipe with this when performing a
line stop with an inflatable gas bag to prevent possible ignitionpfrom static electricity
stopper - answersWhen welding near this, use extreme caution because it could cause
accidental ignition or damage the component
expands - answersAn inflatable gas bag does this when it creates a seal inside the pipe
cutting off gas flow
What is essential to have a successful seal when installing the inflatable gas bag? -
answersmaintaining the correct pressure
You must do this when stopping the gas flow with a mechanical stopper on both sides of
the stopper after completing any repairs on the pipeline - answersequalize the pressure
When should you squeeze off steel pipe? - answersONLY in emergency situation
Pipeline QUESTIONS WITH VERIFIED
ANSWERS
two-way feed - answersThis system is a pipe that receives natural gas from more than
one direction during normal operation
bypass - answersWhat you may need to install to prevent customer outages for those
downstream from a gas stop on a one-way feed system
valves - answersmay be used on both plastic & metallic pipe to control the gas flow
through piping systems
squeezing off pipe - answersusing a valve to stop gas flow on a main is faster than
stopping or
inflatable gas bag - answersUsing this to stop a gas flow on a pipeline is restricted to
low-pressure systems
coupon - answersinstall a retrieval tool after the hot tapping process to remove this if it
was not removed during the process
bonding cable - answersjoin the launch cylinder to the pipe with this when performing a
line stop with an inflatable gas bag to prevent possible ignitionpfrom static electricity
stopper - answersWhen welding near this, use extreme caution because it could cause
accidental ignition or damage the component
expands - answersAn inflatable gas bag does this when it creates a seal inside the pipe
cutting off gas flow
What is essential to have a successful seal when installing the inflatable gas bag? -
answersmaintaining the correct pressure
You must do this when stopping the gas flow with a mechanical stopper on both sides of
the stopper after completing any repairs on the pipeline - answersequalize the pressure
When should you squeeze off steel pipe? - answersONLY in emergency situation
