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What you are investigating is - from the perspective of pumping system design - similar to cavitation. for your purpose $\Delta P$ along the feed pipe is static pressure at pipe inlet minus the minimum allowable pressure at the pump inlet. The first known, from atmospheric pressure, level in tank and specific gravity. Look up NPSH. The second is the vapor ...


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Yes, normally you can pull those plugs out - takes a strong grip or « folding » the ball to be able to push on the inner end of the plug... Here is a photo with such a plug taken out:


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