61:08:09:13Maximum allowable working pressure.

The maximum allowable working pressure (MAWP) of a boiler is determined by the strength of the weakest part of the boiler. A boiler may not be operated above its MAWP. The MAWP on the shell or drum is determined by the following formula: MAWP = TS x t x E R x FS Where TS = 55,000 (lbs/sq in) t = minimum thickness of the plate (in inches) E = efficiency of the joint (nondimensional), as set forth in Appendix A at the end of this chapter R = inside radius of the shell (in inches) FS = safety factor of 5.0 (nondimensional)

Source: 23 SDR 139, effective March 5, 1997.