Issues with pressure gauge sampling points
Thread Content
When the medium under test is a gas, the pressure measurement point should be located in the upper part of the pipeline； When the medium under test is a liquid, the pressure measurement point should be located in the lower half of the pipeline, at an angle of 0–45° relative to the horizontal centerline of the pipeline ； When measuring steam pressure, the pressure measurement point should be located in the upper half of the pipe, as well as in the lower half at an angle of 0–45° to the horizontal centerline of the pipe. I’m not quite sure about the 0-45 degree angle for this paragraph, nor about taking pressure readings at the upper and lower parts.
The relative position of the pressure tapping stub of the orifice plate to the pipeline.
When the medium under test is a gas, the pressure measurement point should be located in the upper part of the pipeline； (Pressure tapping at the top of the pipe) When the medium being measured is a liquid, the pressure tapping point should be located in the lower half of the pipe, at an angle of 0–45° relative to the horizontal centerline of the pipe ； (The pressure measurement can be taken at the bottom of the pipe or within an angle of 45 degrees from the horizontal line to the bottom.) When measuring steam pressure, the pressure measurement point should be in the upper half of the pipe, as well as in the lower half at an angle of 0–45 degrees relative to the pipe’s horizontal centerline. I’m not quite sure about the 0-45 degree angle for this passage, nor about taking pressure readings at the upper and lower parts. (Generally, pressure readings for steam should be taken in the same way as for liquids.) But what this sentence means is that pressure can be taken within the 45-degree range from the horizontal line to the bottom, as well as within the 45-degree range from the horizontal line to the top. It’s the first time I’ve met them too.)
Using the horizontal line passing through the center of the pipe cross-section as the reference line, the area above this horizontal line is considered the upper half, while the area below it is the lower half. What is the angle in degrees between the ray passing through the center and the horizontal line?