ˈdown-comer
a. One who comes down. b. techn. A pipe or tube to convey water or gas downwards (cf. prec. 2).
| 1868 Atkinson Cleveland Gloss. 1888 Lockwood's Dict. Mech. Engin. 115 Down-comer, or down-take, the vertical pipe which conducts the waste gases from the top of a close-mouthed blast furnace into the blast main. 1896 Daily News 20 Apr. 5/2 In the Yarrow boiler there are no outside downcomers. 1910 Chambers's Jrnl. Jan. 60/2 At the extremities of the two drums are large tubular connections, the uptake being at the front end (where the hottest temperatures prevail), and the downcomer outside the furnace at the rear end, which is practically cool. 1950 Engineering 30 June 722/2 Fed from the steam and water drum through downcomer tubes. |