Module 3Engineering ConsiderationsMaterials Selection and TestingEquipment DesignInspection for Corrosion-Process Chec Points!ormulating to "#oid Corrosion TendenciesEngineering Materials- Critical PointsData$ase %esources %e#ie& Materials Selection ProcessDepends on Operating ConditionsReview of Process ComponentsConsideration of Materials Evaluation of MaterialsFollow-Up MonitoringProcesses and pacages are made out of man' different t'pes of materials of constructionDepicted here pumps( #al#es and tans to sho& #aria$les that add comple)it'"ll at different corrosion potentials%a& Materials!inal Products*perating ConditionsTe cemical environment sould !e defined precisel"# including te presence of trace compounds$Temperatures# pressures# flow rates# li%uid vs$ gas# a%ueous vs$ non-a%ueous# continuous vs$ intermittent operation# media used for eating or cooling# and product purit" re%uirements$&!normal or upset conditions$p' range and salt levels %e#ie& Process Components(i)eComple*it"Criticalit" in service- For e*ample+Consider critical # uni%ue pieces of e%uipment in a single train continuous process# were one component failure would sutdown te entire operation$Rotar" valve- Oral Care# (oap Column-Continuous (oap ma,ing$Selection of Materials of ConstructionPertinent past e)perienceMa,ing a list of materials to coose from and teir properties -endors. we rel" to eavil" on tem/0iterature surve" ME1R data!aseTesting of MaterialsCorrosion testing is needed wen+2$ Tere is uncertaint' a!out te rigt material to use3$ (ignificant consequences if te wrong material of construction is used$- Conse%uences- Product contamination or recall# lia!ilit"# safet"$*$+ecti#es of ,a$orator' Corrosion Testing Predict service life Determine te suita!ilit" of a engineering material for a given applicationTo ran, new engineering materials-eneral Corrosion Testing -uideline Use a testing procedure tat fits te situation# consult if necessar'. O!serve samples carefull" !efore and after testing Ta,e pictures !efore and after for comparison (imulate te service environment as closel" as possi!le Effects to ta,e into account4 trace impurities# suspended solids# aeration# temperature and p'$ Corrosion samples can !e ordered from Metal (amples in Munford# &la!ama ttp+55www$alspi$com5ms$tmCorrosion Testing E)ample/ 0end testing to determine the relati#e stress corrosion cracing resistance of312,( 334, and 5516 allo's,a$ Datap7 and Chloride effects on 312 SS p' 3pitting at 6$2 7 C0 at 38 C# crac,ing at 96 Cp' :pitting at 6$2 7 C0at 96 C# crac,ing at ;6 Cp' 23 no pitting at !ormulating to "#oid Corrosion TendenciesSalt Concentration8aCl(odium cloride is te worst possi!le component from a corrosion standpoint in a formula$Minimi)ing it is important# less tan 27 would elp to prolong stainless steel e%uipment life and elp minimi)e micro issues$p7