How to determine whether a sample can be obtained
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The main pipe has a diameter of 6 inches, a pressure of 3 kilograms, a flow rate of 70 cubic feet per hour; the specific gravity of the liquid is 1. The size of the sampling port is 1/2 inch. However, when the sampling valve is opened, air is drawn in through the sampling port and no liquid flows out. How can this be fixed so that samples can be obtained? How can it be determined during pipeline design whether samples can be taken, so that checks can be carried out in advance?
Installing 2 valves should allow sampling. First, open the valve at the base to fill the sampling pipeline with liquid and then close it. Next, open the second valve to release the sampled liquid