DIESTA is an innovative new finned tube technology, dedicated to air cooled heat exchangers, using enhanced surfaces. The technology allows to improve plant efficiency and to reduce construction costs without deviating from the robust design requirements of oil & gas industry standards such as API 661.
DIESTA, short for Dual Internally and Externally Structured Tube for Air-coolers, combines two established technologies for the outside and inside of a tube. The DIESTA tube is a bimetallic finned tube with an aluminum sleeve fully covering the base carbon steel tube. The outside aluminum fins are embedded into the grooves of the aluminum sleeve. To optimize the air- and tubeside heat transfer performance, enhancement structures are applied on both sides. The aluminum fins on the airside combine both a groove and a dimple structure.