“McDonnell Douglas”, “Cryo Anchor – A Tool of Space Age Technology”, Eastman Color? Red Fade, Cryo-Anchor is a McDonnell Douglas trademark “heat pipe”

“Alyeska Pipeline Service Co. has awarded McDonnell Douglas Corp. a $13 million contract to build nearly 100,000 heat pipes for the trans-Alaska pipeline. The heat pipes are Cryo-Anchor soil stabilizers (see Gas Abstr. 29, 73-0686) designed to prevent thawing of permafrost around pipe supports for elevated portions of the line. These passive soil-refrigeration devices utilize an anhydrous ammonia process, with no moving parts or external power. Advantages include low overall cost, ease of installation, high reliability, versatility, adaptability to various supports, recoverability at end of short-term projects, prevention of gradual degradation and irrevocable losses of land and structures, and the possibility of retrofitting to correct developing problems.”

“A heat pipe is a heat-transfer device that employs phase transition to transfer heat between two solid interfaces.[1] At the hot interface of a heat pipe, a volatile liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface. The vapor then travels along the heat pipe to the cold interface and condenses back into a liquid, releasing the latent heat. The liquid then returns to the hot interface through capillary action, centrifugal force, or gravity and the cycle repeats.”