| 261 / | HD | GAS AND LIQUID CONTACT APPARATUS |
| 158 | DF | INDIRECT INTERCHANGE OR HEAT BETWEEN CONTACT FLUIDS {1} |
| 159 | DF | .~ Incoming fluid exchanges heat {1} |
| 160 | DF | .~.~ With fluid at or downstream of contact zone {1} |
| 161 | | .~.~.~ Incoming exchanging fluid is feed gas |