ARSD 61:08:09:18. Hydrostatic pretest -- Safety valve requirements

Each boiler must be equipped with a safety valve which will discharge all the steam that can be generated by the boiler without allowing the pressure to rise more than six percent above the MAWP. One safety valve may be set no higher than the MAWP. Safety valves must be sealed by the holder of an ASME "V" or National Board "VR" Certificate.