Magnetic particle inspection of the compressor rotor
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Today, I came across such a requirement in the API procedure documents: Each rotor shall be subjected to an overspeed test at at least 115% of the maximum continuous speed for a duration of at least three minutes. After the overspeed test, the rotor shall be subjected to a magnetic particle inspection, with the acceptance criterion being zero linear indications. The rotor shall then be checked for balance at the maximum continuous speed; if the acceptance limits are not met, the rotor must be rebalanced. It is stated that after the overspeed test, a magnetic particle inspection is required, with the standard requiring zero readings on the linear scale, and the rotor also needs to be checked for balance at its maximum continuous speed... I would like to know what standards govern the magnetic particle inspection of rotors, what the requirements are, and what exactly is being inspected
It refers to the surface magnetic particle inspection of the shaft, to detect any linear defects. If it’s a rotor, does the impeller also need to be magnetized?