| http://www.w3.org/ns/prov#value | - In accordance with another preferred feature of the invention, the heating tubes are formed in two parts, i.e. the lower portion received in the upper tube sheet and extending downwardly substantially the full length of the falling-film evaporator over its effective evaporator region, and a standpipe fitted into each heating tube and projecting above the upper surface of the upper tube sheet.
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