Elevation issues during piping
Thread Content
When laying pipes, under what circumstances should the elevation EL+XX.XXX based on the center be used, and under what circumstances should the elevation BOP EL+XX.XXX based on the bottom of the pipe be used?
Both of these situations are shown in the drawings; I’m not quite sure about them. I hope fellow sailors can help me understand!
There is no strict boundary between these two cases that specifies where which type of notation must be used; it mainly depends on what I need to control during the design process, and on what makes the calculations easier or results in a more aesthetically pleasing representation (trying to avoid situations where values are not integers). For example, for pipes located in a pipe tray, since the elevation of the pipe tray is fixed, it’s easy to determine the elevation of the bottom of the pipes; it is usually denoted as EL+XXXX BOP.
If you are referring to the elevation at the bottom of the pipe, you should write BOP; for the top of the pipe, use top; and for the middle part of the pipe, use COP. If it isn’t specified, it probably refers to the surface of the foundation
Reply to 4# dgfshfs002: We don’t specify it; it refers to the center elevation. May I ask, what part of the pipe do you mean by the foundation surface?
Reply to 5# zero229: Let me give an example. Suppose there are supports or pipe piers beneath the pipeline; the pipeline is installed on these piers, so the elevation refers to the top of the piers. There is a difference between the elevation of the piers and the bottom elevation of the pipeline, and in such cases support structures like pipe supports are needed to provide reinforcement. Since the elevation of the pipe bottom is specified in the process piping, and the elevation of the foundation top is defined in the civil engineering work, it is up to you to determine the support height for the pipe supports