The hot vapor bypass configuration is a common method employed for fractionation . One situation occurred with sizing of lean amine piping at an NGL. Figure 3c shows the hot-vapor-bypass . opening the hot-vapor bypass heats up the Durand, A.A., Sizing Hot Vapor Bypass Valves, Chem. Eng., August. Hot vapor bypass is a powerful method for controlling tower pressure. Applied correctly, it allows for rapid, sensitive and reliable control. Overall. Hot vapour bypass sshep Chemical 17 May 06 Look Beyond The Paris Accord Pullout. Community Forum Software by IP. Close Reply To This Thread Posting in the Eng-Tips forums is a member-only feature. The companies became part of the same group on July 10 with the full organizational merger expected to be completed by the end of the year. Chemical Safety Board Poll Results: Executives Talk Process Safety.