Downcomer adapters

Downcomer support bars should be compatible with conunercial downcomer adapters. DoAvncomer adapters allow downcomer enlargement in a future revamp without the need to weld new downcomer support bars to the shell. These adapters are clamped to the existing downcomer support bars and to the new downcomer panels (274), and their use can dramatically lower the cost of a future revamp. Downcomer enlargement is one of the most effective and most popular revamp techniques in foaming, high-liquid-load, and high-pressure services. 

When downcomers are sloped or when perforations do not occupy essentially all the area between the downcomers, these simple relations do not apply. However, their adaptation should be obvious from the geometry involved. 

This basic equation has to be adapted to the conditions present at the outlet area of a downcomer. According to Stichlmair (1978 Stichlmair and Fair 1998) the following relationship holds for a standard tray design ... 

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