Model 622 trough collector is the preferred design for the overflash collector tray in deepcut crude vacuum towers.
The decks, hats and/or sumps are sloped to minimize the liquid residence time.
A uniform riser pattern is used to provide good vapor distribution to the packing. The open area of the riser is carefully optimized to provide the lowest possible pressure drop while maintaining proper vapor distribution.
This collector is often equipped with an emergency overflow pipe to avoid excessive liquid residence time and/or spillover down the vapor chimneys in the event that the side draw in temporarily lost.