Q: We’re facing the problem of cavitation in a control valve in very corrosive fluid (H2SO4 80% to 98%wt, or HCL 13 to 30%wt), so we’re considering PTFE-lined valves. The specific application is a level control valve for discharge into an atmospheric tank, so the differential pressure (DP) is high. The fluid is diluted HCL (HCL 13%wt, water 86.7%wt, methanol 0.3%wt). The pipe is 80 DN, Schedule Standard carbon steel with 3 mm PTFE lining. Minimum flow is 21 GPM; normal flow is 74 GPM; maximum flow is 84 GPM. Inlet pressure is 90 PSIA, DPs are 62 PSI, 60.3 PSI, 59.6 PSI at minimum, normal and maximum flow, respectively. Temperature is 122° F; density is 1,050 Kg/m3;…Full Story
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