Existing flow models are applied to predict maximum two-phase flow from a constant area, adiabatic pipe with friction. Graphs are given for maximum steam/water flow rate in terms of pipe f(L/D) and entrance stagnation properties. Theoretical blow-downs are graphed for 1000 and 2000 psia saturated-water systems with f(L/D) ranging from 0.0 to 100. Estimated pipe flow rates and blowdown transients are compared with steam/water data. Reasonable agreement is shown.