One-side arrangement for feed water pipe on drum is simple and the quantity of orifices on drum decreases, it adopts variable pitches in multi-orifices distributing pipe to balance water flow.

Mathematics Model is established for analyzing distribution characteristics of feed water pipe in drum, valuable suggestion is obtained from the model.

This paper focuses on effects of the valve characteristics and the transfer pipe delay on dynamic performance for boiler drum level, under varying valve opening of the feed water control valve.