Ohio Rev. Code Ann. § 4104.42
(A) The owner of any power piping or process piping system shall ensure that all of the following are performed in compliance with applicable sections of the B31 standards contained in the code for pressure piping, published by the American society of mechanical engineers:
(B) The owner of a power piping or process piping system shall do both of the following:
(1) Maintain for five years complete records documenting the design, examination, and testing of the piping system that include all of the following: