What is the "LH" on the top of the container?
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This post was last posted by Benbenxuan on 2010-5-16 20:51. The editor has this logo on the PID.: What is the LH in the red circle mark on the top of the container? Moderator Tips: Very good examples, please speak freely. But be careful not to repeat what others have already said. Otherwise, treat it as irrigation.
It probably means the design pressure at the top of the container.
First of all, the manhole is at the lower part of the container, code-named MW. (Isn’t the 8" manhole a little too small? In addition, this is a normal pressure vessel with an overflow at the top. What is the purpose of setting a high liquid level alarm there? The vessel is equipped with local and remote level instruments. If it is the design pressure at the top of the container, should it be written on the equipment tag number on the upper part of the drawing, right? And why not write down the specific value?
This post was last edited by zpg on 2010-5-12 16:54. The poster can take a look at the home page of the PID flow chart provided by the foreign party. MH/HH/CH respectively represent manholes, hand holes, and inspection holes. LH is rare. The impression is that it is a horizontal observation hole (there seems to be an overflow pipe in the poster's picture), which is a hole installed horizontally to observe the water level (liquid level). The abbreviation of hole level, because it emphasizes horizontality and cannot open holes vertically, so it is level Hole, I just don’t know what foreigner means here, haha.
Can 8 inches and DN200 be a manhole? Who can get in? Is it a light hole? It is used for lighting and transmitting light.
It should be an inspection hole, which is used to put the gauge down to check the height of the material level in the container, so it is located at the top.
L generally represents liquid level, I represents indication, and I don’t know what H is.
L generally represents liquid level, I represents indication, and I don’t know what H is.