2. Distillation towers, evaporation towers, and stripping towers whose maximum operating pressure at the top is greater than 0.03 MPa (where the steam at the top of the stripping tower is fed into another vaporizer...)
Thread Content
Can distillation towers, evaporation towers, and stripping towers with a maximum operating pressure at the top of more than 0.03 MPa (with the exception of those in which steam from the top of the stripping tower is fed into another distillation tower) be understood in this way: after a power outage or water supply interruption, without heat exchange for the gas inside the tower, the gas phase load increases, leading to overpressure in the equipment?
The best way to explain such problems is by using diagrams. Regarding the pressure setting, it is mostly determined based on process requirements. Safety considerations are taken into account, but there may be other settings for the set pressure used to prevent accidents. For example, power loss discharge, backflow, cutoff, etc. There are many methods. It’s still better to rely on the actual illustrations; looking at them will make things clearer, for reference.
These are mandatory provisions in the petrochemical standards.
This post was last edited by bfdlwolf on 2020-4-28 08:51. Fire Protection Design Code for Petrochemical Enterprises (2018 edition) (GB50160-2008): “5.5.1 Safety valves shall be installed on the following equipment that may develop pressure under abnormal conditions: 1 Pressure vessels with a maximum operating pressure of 0.1 MPa or higher”； 2 Vapor condensers, evaporation towers, and stripping towers with a maximum operating pressure at the top greater than 0.03 MPa (except those in which steam from the top of the stripping tower is fed into another distillation tower) ； ” The provisions state that \"5.5.1.2 Most towers for gas-liquid mass transfer are equipped with safety valves, as factors such as power outages, water supply interruptions, interruptions in the reflux flow, excessive gas lift, or too much water (or light components) in the feed material can all lead to a sudden increase in the gas-phase load and cause overpressure in the equipment. Therefore, safety valves should be installed whenever the operating pressure at the top of the tower exceeds 0.03 MPa (gauge).\" ”