set point p s is chosen depending on whether p si is above or below or between the minimum maximum limits the g si term in the set point integrator equation determines the maximum integrator reset rate which is chosen so as to avoid unacceptable surge conditions in the flash tank under rapid system depressurization in other words should rapid depressurization occur in the turbine it is desirable to slowly bring the flash tank pressure down in order to avoid boiling and consequent surge in tank water level it has been verified experimentally that if the maximum allowed rate of pressure set point decline were limited to 1 psi sec then the flash tank would be adequately protected the program between states l 1 and l 2 fig3 b is used to derive a pressure error signal p e the involved steps include reading the flash tank pressure p ft and subtracting the pressure set point p s from the flash tank pressure p ft the error signal limited to a value between 1 low pressure bypass full open and 1 admission control valve full closed the program between states l 2 and l 3 fig3 c calculates a control signal p cs on the basis of the error signal the p cs value is applied to the low pressure bypass valve actuator and if positive will position the valve proportionately if p cs is negative the valve remains closed the same signal p cs is used to calculate a load adjust signal l a by adding it to the load reference l r the program at l.