< Back to News
Date: June 15-24, 2021
Time: Daily between 8am & noon
Land location: NW 34-49-15 W4M
TC Energy land agent: Don Togerson
Phone number: 4038079793
Onsite technician (blowdown co-ordinator): Grayson Harter
Cell number: 587-585-5742
Estimated duration of blowdown: Approximately 20min
At TC Energy, the safety of the public and our employees is a
To ensure our pipeline system continues to meet
the highest safety standards, we periodically perform routine
maintenance as part of our Pipeline Integrity Maintenance
Program. As part of this work, you may hear a sustained loud
noise known as a “blowdown.”
A blowdown is the act of releasing natural gas from the pipeline
system so work can be done safely on the depressurized
facilities. TC Energy employees will close the required valves to
isolate the facilities and then open a blowdown valve to safely
depressurize in a controlled manner.
A loud roaring sound may
occur when the natural gas is released, although TC Energy may
employ tools to minimize this noise whenever possible The sound during a
blowdown can be as loud as an airplane engine and may last anywhere from a few
minutes to multiple hours, depending on the amount of pipe being depressurized.
As the flow of gas gradually slows down, the noise also lessens.
After the natural gas is released, a funnel-shaped air expeller is
placed on top of the blowdown valve opening, which draws any remaining
gas out and makes it safe for activities such as welding.
Once maintenance is complete, work begins to safely bring
the line back into service. Natural gas is sent back into the
pipeline and, once it reaches pressure, the blowdown valve is
opened once again to vent the atmospheric air. Once all the
air is removed, the blowdown valve is closed. The line is then
pressurized to its normal operating pressure.
Blowdowns of different types occur regularly along our pipeline
system, from long sections of large-diameter pipeline to
above-ground compressor station maintenance. They are part
of the safe maintenance and operation of our facilities. We
recognize they can be an inconvenience for our neighbours and
we do everything we can to minimize the effects. Residents
living in close proximity to the planned blowdown location
will receive notification of the blowdown prior to the work
If you have questions or concerns,
please contact TC Energy first.
450 – 1 Street S.W. Calgary, AB
Canada, T2P 5H1
(weekdays 7:30 a.m. to 5 p.m. MST)
In case of a pipeline emergency, call: