The question is a bit difficult; it relates to stress
Thread Content
For pipes with a grade of 2.5 MPa, when the pressure of the medium inside the pipe is 0.5 MPa, should the range of the pressure gauge selected for such pipes be determined based on the pipe grade or the pressure of the medium? That is, should it be 0~2.5 or 0~1.0. (The high pipeline pressure rating is a regulatory requirement; for such media, pipelines with a pressure rating of not less than 2.5 MPa must be used.)
If the pressure inside the pipeline will always be 0.5 MPa in the future, then choose the 0–1 MPa range.
It depends on your requirements. For higher precision, choose the pressure corresponding to the medium ； The requirements aren’t very high, so go with the 2.5 version – it will solve the problem once and for all.
It is a matter of choosing the range, which relates to your requirements for precision.
Select the range of the pressure gauge based on the medium pressure, that is, a pressure gauge with a range of (0~1) MPa.
It depends on the maximum pressure of the process medium, not on the design pressure of the pipeline.
What was said upstairs is correct. Choosing a range of 0–1 MPA will do
It is generally chosen based on the operating pressure, that is, 0.5 MPa is selected.
With the medium remaining unchanged, the designed pressure will not be reached (under normal conditions); of course, 0 to 1 megapascal should be chosen, as this provides accuracy and meets the requirements for selecting a pressure gauge. If your medium value keeps fluctuating, or is likely to reach 2.5, then you need to choose a model with a larger measurement range!
The operating pressure for this type of medium is very low, but the standards require a relatively high pipeline pressure rating. There are generally two reasons for this: either it is due to the saturated vapor pressure of the medium, or because the medium is a highly toxic fluid. Different treatment should be applied; the design pressures for the two scenarios are not the same. I think the range of the instrument should be determined based on the design pressure for each specific situation, as it is this design pressure that represents the highest working pressure that could occur. Moreover, the selection of the pipeline grade is also related to temperature. A pipeline pressure grade of 2.5 Mpa does not mean that the design pressure is also 2.5 Mpa. I have never seen the range of an instrument being chosen based on the pipeline pressure grade. For example, for a medium at 4.0 Mpa and 400°C, if a pipeline with a nominal pressure rating of 5.0 Mpa is not sufficient, then a pipeline with a rating of 10.0 Mpa must be used; in such a case, it’s not possible to select a measuring range of 10.0 Mpa for the instruments. The words \"highly toxic\" will be censored:o
What’s hard about it? Let’s go with a 2.5 for now. Safety net. If the customer is not satisfied with the craftsmanship and requests a change, it is their request for a change, and you are not liable.