| 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 173 | | .~.~ Pipe exterior surfaces about to form continuous surface |