PSI's casing
spacers/isolators are used on long distance
transmission pipelines for three purposes. When a
pipeline intersects with a railroad right-of-way,
highway, waterway or any other thoroughfare the
pipeline usually passes under or is buried beneath
the obstruction. For protection in these areas, the
carrier pipe is placed inside a casing pipe in an
effort to “double contain” the fluid that is passing
through the carrier pipe. If a leak or break were to
occur, the fluid would be directed to a safe
distance away from beneath the thoroughfare. In
fact, many local Governmental Agencies require this
procedure almost anywhere when volatile or hazardous
fluids are flowing through the carrier pipe.
Secondly, the
casing spacer/isolator is used to electrically
isolate the carrier pipe from the casing pipe. In
most cases a corrosion mitigation program is in
place to protect the carrier pipe from the
detrimental effects of the environment and
surrounding soil. Any outside influence of stray
electrons can render the corrosion mitigation
completely ineffective. A casing spacer/isolator
ensures that no metal to metal contact is made
between the carrier pipe and casing pipe which
ensures the integrity of the corrosion mitigation
program.
Thirdly,
casing spacers include low coefficient of friction
runners on all surfaces making contact with the
casing pipe which facilitates easy insertion of the
carrier pipe into the casing, an especially
important feature when making long pulls/pushes with
heavy pipe. PSI's runners have a tensile strength of
17,600psi, a flexural strength of 25,300 psi, and a
compression strength of 18,000psi.
