675 IAC 30-11-3 Safety factor

Sec. 3. The minimum factor of safety shall in no case be less than four (4) for carbon steel or low-alloy steel vessels operating with metal temperatures below seven hundred (700) degrees Fahrenheit. For high alloy steel the maximum allowable stress value shall be indicated in the applicable table of maximum allowable stress values provided in the applicable provisions of the ASME B&PVC in effect at the time of fabrication for the material and temperature involved. The factor of safety may be increased (or the maximum allowable stress may be reduced) when deemed necessary by the inspector to ensure the operation of the vessel is within safe limits.