Pipe elevation marking
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When indicating the elevation of pipes, some values indicate the center elevation while others indicate the bottom elevation. What is the difference between them? When should the bottom elevation be indicated, and when should the center elevation be indicated?
It is mainly related to one’s own habits and the way in which pipe racks are marked.
Personally, I think we should indicate the value that plays a dominant role. For example, for the pipe above the ground, if we mark the center elevation, the pipe might be in contact with the ground; therefore, it’s better to mark the elevation of the bottom of the pipe.
What the two hosts upstairs said is correct; it’s generally advisable to indicate the elevation at the bottom of the pipe!
Refer to standard SH3052-2004-T: Method for indicating the elevation at the top of a pipe: EL.xxxTOP; Method for indicating the elevation at the bottom of a pipe: EL.xxxBOP; Method for indicating the elevation at the center of a pipe: EL.xxx
In my personal opinion, when the elevation of a pipe needs to be determined, the bottom elevation is generally used; for relative heights, the center elevation is usually adopted
It also depends on the situation. Pipes on pipe racks are usually marked at the bottom, while in devices they are more often marked at the center
Bottom of the gauge tube on the pipe rack. The center height is usually indicated on the device.
It is advisable to use the general standard bottom elevation of the pipe rack, as well as the general standard center elevation where the equipment pipe openings meet, so as to ensure proper connection.
Personal opinion: Generally, it is the bottom elevation of the standard pipe, but for sloped pipes, the center elevation should be indicated
Refer to SH3052-2004-T Piping Engineering Design Legend for petrochemical industries. http://cid-bf59d7049c9df6f2.skydrive.live.com/self.aspx/.Public/%e6%a0%87%e5%87%86/SH3052-2004-T%e7%9f%b3%e6%b2%b9%e5%8c%96%e5%b7%a5%e9%85%8d%e7%ae%a1%e5%b7%a5%e7%a8%8b%e8%ae%a1%e5%9b%be%4e%be%8b%20.rar