Sticknmp The answer to this question on Type 304 SS in gypsum slurry at your pressure, flow rate and at your chloride levels is quite complex. There may not be any ready or practical experience or correlation available to give a reasonable life prediction i.e., to give immediately an answer on the erosion-corrosion rate expected on your S.S. 304 piping. I have read some published work but off hand i do not remember details to give any feed back on such speicific case study for this material. Published information (till date) and literature studies indicates that wear from the flow of slurry is a complex process, dependent upon many parameters. Many of these are still not well understood today. In fact, it appears that there are many inter-dependencies among some of those parameters, making a fundamental understanding very challenging. Trust this helps you C.V.Srinivasan Nishi Engineers Pvt Ltd India April 21,2007 E-mail: nishi@vsnl.com >What would be the expected life of 2 inch, schedule 40, >304SS piping used to transport FGD absorber gypsum slurry >(12,000 ppm chloride)? The operating conditions are 130 >degrees F with 95 psig. The slurry flows at 7 ft/s and has >a density of about 68 lb/ft3. What is the general corrosion >rate of 304ss exposed to these kinds of conditions? Would >the piping last more than 3 years before needing to be >replaced? Any help would be appreciated.