Radar level gauge with isolation valve
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I’m seeking advice from those with more experience: for the radar level gauge installed on pressure vessels, my supervisor wants an isolation valve to be added. Previously, radars were installed directly with flanges; how is it done for those with isolation valves? Does the radar horn need to pass through a valve? If it passes, won’t the valve be unable to close? If it doesn’t pass, then it’s equivalent to adding an additional length to the equipment’s flange, preventing the flare from fitting inside the equipment – wouldn’t that result in inaccurate measurements? As for guided wave radar, it’s even less possible to bring it along
The flared mouth is installed inside the extension tube, while the ball valve is installed below the extension tube
Agree with the comment above; that’s how it’s normally installed.
In other words, there is a protrusion distance of the pipe outlet from the top of the tank to the pipe outlet flange; then, above the pipe outlet flange, there is a ball valve, and further up is the flare. Usually, isn’t it necessary to push the bell mouth as far inside the device as possible? If that’s the case, the bell mouth will be far away from the device, leading to inaccurate measurements, right?
I’ve learned it.* So there’s this way of doing it too.
Is a pressure vessel a spherical tank? If it is a spherical tank, it is recommended to use a servo level gauge equipped with a guide tube; the steel ball located beneath the servo level gauge can move up and down, and a ball valve can be installed there. For radar level gauges equipped with ball valves, it depends on the measurement range you need; parameters such as the horn diameter and the diameter of the installation pipe must be provided in order to make a determination
Old Pig, generally speaking, DN80-DN150
Generally, ball valves are used to meet the requirements of servos. In the case of radars, unless the antenna beam angle is small enough, the nozzle plus the ball valve neck become too long, which results in significant energy loss ahead of the radar. If the dielectric constant of the material being measured is moderate, it’s fine; but if it’s low, it could be dangerous