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Have old galvanized 1/2" domestic hot water pipes/fittings w/ low flow. Rinse with vinegar??

Any suggestions on how/whether to try dissolving the calcium inside my galvanized hot water supply pipes? I know it would be best to replace them with PEX, but that would be really disruptive in this old 4-unit apartment building.
I'm considering siphoning vinegar into the pipes, letting it soak and then flushing it out. My fear is that the calcium might be actually sealing the threaded fitting joints at this point, and that I might end up with leaks inside the walls after the vinegar dissolves the calcium.
Anyone have experience with this?
Mad Dog_2mattmia2SuperTech