| 165 / | HD | HEAT EXCHANGE |
| DIG 163 | DD | INCLUDING A MEANS TO FORM FLUID FILM ON HEAT TRANSFER SURFACE (E.G., TRICKLE) {8} |
| DIG 172 | DD | .~ Film flows along exterior of plural pipe sections {3} |
| DIG 175 | | .~.~ Horizontally extending, parallel sections disposed in vertical array (i.e. one pipe directly above another) {1} |
| DIG 176 | DD | .~.~.~> With means suspended beneath pipe surface to guide liquid droplets |