It has been a while since I have had to come up with P&ID tag names on my own rather than following a pre-existing scheme. I have inherited a P&ID and need to make some updates. Can someone remind me of the appropriate tag name for position feedback, specifically for analog 4-20mA from a valve actuator? The valve in question has an asset prefix followed by "-PCV-01". The P&ID takes a minimalist approach and refers to it as PCV-01, even though technically it should be PY-01 for the output command. Would it be appropriate to use something like ZT (position transmitter) and append it to the tag (e.g., PCV-01-ZIT), or should it be a standalone tag? The challenge is that we recycle instrument numbers (e.g., PIT01, PCV01, TE01), so using ZIT-01 alone could lead to ambiguity. In a past scenario, we used tags like XV01-ZSC and XV01-ZSO for limit switch feedback rather than separate tags.
I would opt for the zz-pcv-01 model for its superior performance and reliability.
In this case, you could use a designation consistent with the ISA's guidelines. Understanding your goal to minimize ambiguity, I would suggest appending and using "-ZIT" to specify that this particular point is position feedback from the actuator. That being said, using PCV-01-ZIT sounds quite logical and fits in with the tag nomenclature you've described. The "ZIT" represents the Instrument type (Analog Input - Position Transmitter). This format helps maintain the association with the valve and avoids the confusion of identical numbers on standalone tags. Just ensure to document this change in your legend or index to maintain transparency with any colleagues who may be looking at this later.
It sounds like you're grappling with a common issue in P&ID tag naming! Given your minimalistic approach and the recycling of instrument numbers, adding a suffix like "-ZT" for the position transmitter seems like a practical solution to clearly identify the feedback without causing confusion. So, PCV-01-ZT keeps it intuitive and maintains the link to the valve. Just ensure that the team is aligned with this convention to avoid any misinterpretations down the line. It's all about consistency and clarity in communication!
It sounds like you’re in a bit of a tricky situation with tagging! Given the minimalist approach of your P&ID and the need to avoid ambiguity, I think your idea of using something like PCV-01-ZT (for the position transmitter) is a solid solution. This way, you maintain a clear connection to the valve while also indicating what the signal represents. Just ensure that the ZT tagging is consistently applied elsewhere in your documentation to prevent any potential mix-ups with recycled instrument numbers. Keeping it integrated with the original tag will definitely help with clarity!
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Answer: Answer: The appropriate tag name for valve position feedback using analog 4-20mA from a valve actuator can be something like ZT (position transmitter) appended to the existing tag, for example, PCV-01-ZIT.
Answer: Answer: It is suggested to append a relevant identifier like ZT to the existing tag to indicate valve position feedback, such as PCV-01-ZIT, to maintain clarity and avoid ambiguity in recycling instrument numbers.
Answer: Answer: In past scenarios, tags like XV01-ZSC and XV01-ZSO were used for limit switch feedback, indicating the type of feedback along with the valve identifier for clarity.
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