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No. The rust is inconsequential and those pipes will likely outlive the gas meter equipment itself. The reason that the rust is at the threads is because the threads are not painted well on purpose; it prevents a good seal when they're putting the gas meter together. Depending on your gas company's policies, painting the gas meter could be a violation of ...

DA01 is correct about direct contact with concrete to a point. If the steel and concrete are above ground grade and the concrete is beveled enough for any water to run off or not collect around the pipe, then serious rusting will take a very long time. As far as rust proofing the steel pipe, clean the metal very well. Sand off any paint or other materials. ...

Is the garage door made out of steel? Here is a good article on repainting rusty steel: I think the key is to prep by washing the area and then removing as much rust as possible by scraping and then using a wire brush (or even sanding). Prime the area with Rustoleum. The topcoat should be high quality latex exterior paint.