Condensation Pot Design: Model Tests

Abstract

On two separate occasions air/water model studies have been made at the University of Auckland to determine the performance of the condensation catchpote on the main steam pipelines at Wairakei Power Station. The first series of tests was concerned with recommending a design for a new 1.22 m (48 in) diameter steam main. The second series was an attempt to improve the collection efficient of pots installed on the existing 76 cm (30 in) diameter steam mains. This was part of an investigation program to alleviate pipe corrosion which had been discovered at a biennial plant shutdown. This paper reports on the model tests, which largely complement each other, and result in an understanding of this type of cavity flow. A critical depth is shown to exist below which the collection efficiency is low. Installation of baffles is effective in improving the efficiency, and pressure drop data is presented.