"688600" . "Recorded" . "SPIRAL TUBE HEAT EXCHANGER" . "SPIRAL TUBE HEAT EXCHANGER" . "RDS443924" . "A shell and coil heat exchanger in which a single tube is formed into a spiral, i.e. the tube formes a plane curve and winds about a fixed pole from which it continually recedes." . "u20683" . "2005.10.03" . .