Discover Turbomachinery Scaling Limits and Stall Control — You can size a pump or compressor with simple speed and diameter rules. Those rules fail when the machine gets very small or very large, because wall roughness and tip gaps stay the same size while the blades change. At low flow the air or gas peels off the blades. That stall can spin around the rotor. If the whole system cannot hold the pressure, flow slams back and forth. That is surge. You stop it by keeping flow high enough with recycle valves, bleeds, or movable vanes.

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Why do compressors stall?

Discover Why Empty Pressure Vessels Are Dangerous — Empty does not mean safe. Drain a tank too fast or cool it with no vent and the air pressure outside can crush the shell. Leftover gas, heat, or chemicals can still be inside. Workers die in tanks they thought were empty because they never treated vacuum, residue, and confined space as the load.

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Why are empty pressure tanks dangerous?

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