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Slip on flanges in category M piping indeed require welding both inside and outside to ensure they meet the necessary mechanical integrity and safety standards. Category M piping typically pertains to systems that carry potentially hazardous materials, where the risk of leaks can pose significant safety concerns.

Welding the slip on flanges inside and out creates a robust connection, enhancing the reliability and strength of the piping system. This dual-welding process helps in distributing the stress uniformly around the joint, which is especially crucial in high-pressure or high-temperature applications. It also adheres to various code requirements that mandate such precautions to mitigate the risk of failure.

To summarize, the requirement for both inside and outside welding with slip on flanges in category M piping is a crucial practice for maintaining system integrity and safety, thus validating the statement as true.