Hydrostatic Test

A. Whenever a boiler is subject to hydrostatic test required by these rules, the required test pressure may be at a pressure no more than the maximum allowable working pressure for the installation so tested, at the discretion of the special inspector. B. Re-rating of a boiler shall be subject to the requirement of the National Board Inspection Code. The test pressure shall be under proper control so that in no case shall the required test pressure be exceeded by more than six (6) percent.