Requirements for the orientation of the tower’s nozzles

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(1) The orientation of the pipe openings in the tower should meet the requirements of the working principles and structure of the internal components of the tower; during design, attention should be paid to the relative orientation between the overall structure of these internal components and the pipe openings； The vapor outlet at the top of the tower is located in the middle of the tower’s top cover ； The reflux opening of the tower is generally located on the pipe side above the tray ； The gas feed opening is located above the tray, parallel to the downcomer ； The gas-liquid mixed-phase feed opening is located above the tray, with a distribution pipe in place ； The stripping steam inlet is located below the stripping tray, along with a gas distribution pipe. A sampling hopper should be installed in the circular area below the downcomer at the side-line product sampling port; for double-overflow tray columns with intermediate downcomers, the sampling port can be arranged at any angle there, and a sampling hopper should be provided ； The bottom extraction port is located in the middle of the bottom head cover, and an anti-vortex plate is provided; the extraction port should extend outside the tower’s skirt ； (2) For towers equipped with trays, manholes should be located along the tower diameter parallel to the tray overflow weirs; if this is not possible, they need not be parallel, but the horizontal distance between the manhole and the overflow weir should not exceed 50 mm. (3) The orientation of the manhole lifting mechanisms and the placement of ladders should be coordinated with each other. In the event of an accident, the direction in which the manhole cover can be closed smoothly should be the same as the direction in which people evacuate ； (4) The level gauge interface can be connected directly to the level gauge via a root valve, or it can be connected to the level gauge through a connecting pipe connected to the root valve. The level gauge interface must not be located within a 60° angle range opposite the feed inlet, unless the feed inlet is protected by an internal baffle. Baffles should be installed on the externally floating ball type level control nozzle that is connected directly to the tower. Devices such as level gauges, level control floats, and alarms are usually located within the tower platform or at the ends of the local platforms to facilitate maintenance ； (5) The pressure gauge interface should be located in the gas phase region of the tower, so that the pressure gauge readings are not affected by the liquid level head ； (6) Placement of sampling ports and temperature measurement ports: The gas-phase sampling ports and temperature measurement ports should be located away from the gas phase region of the tray liquid drop pockets, while the liquid-phase sampling ports and temperature measurement ports should be placed within the liquid holdup layer of the tray in the liquid drop tube area ； For liquid phase sampling tubes that are prone to crystallization, they should be placed towards the tray ； (7) The positioning of the suspension column at the top of the tower should allow it to rotate above the lifting points outside the platform, as well as over the locations of all access holes in the platform.