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Category: Tower Pressure

Tower Pressure

Tower Internal Manways

Posted on April 30, 2011

Contract maintenance workers often will not replace the tray manways unless the tray manway is adjacent to a tower external manway. They reason that once…

Tower Pressure

Seal Pans Downcomer

Posted on April 30, 2011November 8, 2012

The downcomer from the bottom tray is submerged in a seal pan (see Fig. 8.3), to preserve its downcomer seal. I always set the horizontal…

Tower Pressure

Shear Clips

Posted on April 30, 2011November 8, 2012

If a tower has a history of tray deck damage due to pressure surge or high liquid level, the mechanical integrity of the trays should…

Tower Pressure

Tower Final Inspection

Posted on April 30, 2011

At a Gulf Coast refinery, the reboiler thermosyphon circulation could not be reestablished after a turnaround. The tower was reopened and a lessthan-alive contract employee…

Tower Pressure

Inlet Weirs

Posted on March 29, 2011November 8, 2012

Most trays have outlet weirs devoted to maintaining the downcomer seal. But some trays have inlet weirs too, or inlet weirs, but no outlet weirs.…

Tower Pressure

Improper Downcomer Clearance

Posted on March 29, 2011

The bottom edge of the downcomer from the tray above should be 0.25 to 0.5 in below the top edge of the weir of the…

Tower Pressure

Loss of Downcomer Seal Due to Leaks

Posted on March 29, 2011November 8, 2012

The vertical edges to the downcomers are bolted to bars welded to the vessel wall. These are called, “downcomer bolting bars.” Gaskets are often used…

Tower Pressure

Tray Deck Levelness

Posted on March 29, 2011

For smaller diameter towers a visual check of tray deck levelness is sufficient. For two-pass trays, a small diameter tower is less than 8 ft.…

Tower Pressure

Internal Reflux Evaporation

Posted on January 24, 2011November 9, 2012

The tray temperatures in our preflash tower, shown in Fig. 6.4, drop as the gas flows up the tower. Most of the reduced sensible-heat content…

Tower Pressure

Conversion of Sensible Heat to Latent Heat

Posted on January 24, 2011

When we raise the top reflux rate to our preflash tower, the tower-top temperature goes down. This is a sign that we are washing out…

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