"These large valves can be placed every
5 to 20 miles along the pipeline."
"Interstate pipelines include a great number of valves along their entire length.
These valves work like gateways; they are usually open and allow natural gas to flow freely,
or they can be used to stop gas flow along a certain section of pipe.
or they can be used to stop gas flow along a certain section of pipe.
There are many reasons why a pipeline may need to restrict gas flow in certain areas.
For example, if a section of pipe requires replacement
or maintenance, valves on either end of that section of pipe
or maintenance, valves on either end of that section of pipe
can be closed to allow engineers and work crews safe access.
These large valves can be placed every 5 to 20
miles along the pipeline, and are subject to regulation by safety codes.
Source: Natural Gas - Transport - Valves
Photo Source: Duke Energy Gas Transmission Canada, Natural gas.org
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