Only pipe runs that have a related instrument are retrieved from Smart P&ID as lines. The instrument receives its preliminary process data from the related line. For control valves, the line that is retrieved in most scenarios corresponds to the pipe run directly connected to the upstream end of the valve, except under certain conditions.
These conditions are:
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The flow direction is specified.
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A reducer is connected at the upstream end of the valve.
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The larger diameter pipe is connected to the far end of the reducer.
If all the above conditions are fulfilled, the retrieved pipe run is not the one directly connected to the upstream end of the valve, but rather the pipe run at the far end of the reducer.
The following diagram shows an example of a P&ID involving pipe runs and related control valves.
For this scenario:
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The flow direction is specified for both valves.
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Reducer R2 is connected downstream of both valves and therefore has no influence on the pipe run retrieval.
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In relation to valve 101-CV-041, reducer R1 is connected with the smaller diameter pipe at the far end of the reducer, so pipe run P-200-4" is retrieved with valve 101-CV-041.
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In relation to valve 101-CV-042, reducer R1 is connected with the larger diameter pipe at the far end of the reducer, so pipe run P-200-4" is retrieved with valve 101-CV-041.
Therefore, Smart Instrumentation retrieves both valves with pipe run P-200-4". Pipe run P-200-3" is not retrieved.