Valve size in PID
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Some of the valves in the PID are 6 long and 3 wide； Some are 5.5 long and 4 wide. It’s too chaotic; there’s only one such valve in the legend. Don’t the valves of different pipe diameters vary in size? Should it be unified to one size?
It’s probably a problem with the drawings provided by the design institute; they should all be of the same size, and dimensions should be indicated
PID itself has no requirements regarding size; typically, the design office provides a legend sheet with symbols, and the size of the valves in the PID diagram should match those shown in the legend symbols
The valve in a PID represents merely a symbol; its size is generally the same as that of the pipeline. For example, a valve installed on a DN100 pipeline is usually also a DN100 valve.
In the process packages available today, the length-to-width ratio of valves with different pipe diameters is 2:1; their size is adjusted accordingly to the pipe diameter, but generally there are only two types – one larger and one smaller； Easy to identify, and not cluttered ； Generally, the same set of drawings does not have two different scale legends
The legends on the PID diagrams are uniform; the varying sizes indicate that these PID diagrams have been combined together, coming from different versions of the drawings
Generally, when we draw diagrams, the valves for all pipelines in the PID are 6 units in length and 3 units in width, with no distinction based on pipe diameter
It is unified; hg20519 has relevant regulations. The size of the PID does not necessarily correspond to the actual size of the device.
HG/valve length is 6, with width of 3 or 4:2. If it is not done according to the specifications, follow the diagram on the first page of the P&ID
The valve size is not indicated on the PID, unless it has special significance in which case the design institute will indicate it specifically
It seems that ultimately, the instrumentation team is responsible; the PID diagram is just a rough outline