Cement Lined Pipe
A cement lined pipe is a metal pipe lined with concrete or mortar to reduce corrosion in the pipe.
Cement lining of pipes was first implemented in the late 19th century after it was discovered that a layer of mortar resisted corrosion. At first cement lining was carried out manually in pipes large enough for a person to enter the pipe. Later cement lining machinery was developed which enabled smaller pipes to be lined.