3　Structure and Main Component Parts of Tray

The structure and nomenclatures of main component parts of the tray are shown in Figure 3.

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Figure 3　Structure of tray

1—Seal pan；2—Tray floor integrated to beam；3—Hatchway；4—Downcomer；5—Sealing plate；6—Major beam；7—Downcomer bar；8—Connecting bar；9—Beam support；10—Positioning device；11—Fastener；12—Support bar；13—Support ring

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