Calculation of the wetted area under fire conditions.
Thread Content
When calculating the wetted area under fire conditions, I am taking into account the safety valves on the tower, as well as related equipment and pipes – including those from the tower to the pump and then to the heat exchanger. The heat exchanger is also located below 7.6 meters. Should the wetted area of the heat exchanger be considered in this case? The key point is that the medium entering the tower flows through the pipe side; should this area be considered as being exposed to fire, or only the head section? Additionally, in this heat exchanger, only some of the tubes are below 7.6 meters, not all of them. I would appreciate advice from those with experience
Is no one responding? Urgent question while online
Usually, only those heat exchangers and pipelines that are closely related to the tower and located very near it are taken into account, such as the reboiler and its associated pipelines. For horizontal heat exchangers, the 7.6m limitation is usually not a concern. In the case of a tube bank, what needs to be calculated is mainly the exposed area of the tube bank section.
Thank you very much for your reply. I would like to ask you something in more detail: what do you mean by not needing to consider the 7.6-meter limit? My heat exchanger is horizontal, and part of its tubes are below 7.6 meters in length. Do you mean that the area of the entire heat exchanger should be taken into account? Also, regarding what you mentioned about the medium flowing in the tube side, what does it mean to calculate the exposed area of the tube bank? Are you referring to the pipe box below 7.6 meters? Doesn’t the area of the heat exchange tubes inside need to be included? Thank you very much for your reply. I hope you could explain it again