Selection of pressure tapping points
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A pressure device has only one remote pressure transmitter port; if an on-site pressure display is required, can a short circuit be created at the pressure transmitter port and an on-site pressure gauge installed there? Is this in compliance with the regulations?
It doesn’t meet the requirements; generally, it is required that remote transmission and pressure measurement cannot use the same pressure tapping point. But usually no one checks this. If it’s in a less important area with a low pressure level and no one will check it, then it’s okay to use it this way
Can’t the display on the pressure transmitter be used as an on-site display?~
The remote pressure transmitter has a display, but it cannot be used as an on-site pressure gauge
Remote transmission allows display, but the text is quite small; it’s not as convenient to read as with a pressure gauge.
Pressure equipment, referred to as pressure vessels, usually come equipped with flanges. Pressure transmitters are generally diaphragm-type; I’m not sure how to add this jumper. If it’s really unavoidable and adding it is necessary, I think the issue of pressure vessel inspection should be considered first
If it’s connected through a pressure tapping pipe, it’s very simple: just a + tee + a manual valve will do
Many of them here are installed this way.
It does not meet the standards, but it’s no problem to add a tee connection; I’ve seen many such examples. It would be better if both the pressure transformer and the pressure gauge were equipped with a root valve each.
Considering these three points: 1. Whether this parameter needs to be involved in interlock control; 2. Whether it is a reference value or an operating value; 3. Whether its display on-site is optional. Pressure vessels must not have holes made in them arbitrarily; if interlock control is involved, only tees can be used, and a root valve must also be installed. There are no explicit requirements in the relevant specifications regarding this aspect. If it is a non-operational quantity or a parameter that can be optional, there is no need to add fault points! (The more connection points there are, the more potential failure points there will be as well.)