How to choose the material of the valves in the ammonium phosphate solution pipeline
Summary The results of macro and micromorphology and metallographic structure analysis of SS304 gate valve used for leakage of ammonium phosphate solution using metallographic microscope and scanning electron microscope are introduced, and the use of photoelectric direct reading spectrometer, X-ray fluorescence spectrometer and The NHO analyzer analyzes the gate valve material and the composition of the surface deposits. It summarizes the failure modes of the SS304 gate valve used in the ammonium phosphate solution pipeline as corrosion and fouling and points out why the SS316 valve is used in the ammonium phosphate solution pipeline. And put forward the corresponding countermeasures to solve the problem and the technical basis to prevent similar accidents.
Keywords Gate valve, leakage, failure analysis, fouling, corrosion