dear experts
we are facing similar problem in one of our catalyst drain line which is intermittent in service since commisioning.
the line operates at the time of decantation only,frequency once a week .it's being observed that a localized paper thinning of firstly CS then SS304 has taken place in a short span of 1 month of their commisiong(decanation cycle 2).
the thinning to big hole has taken place to downstream/ of valve in CS/SS both and upstream of Valve in the pipe portion while the line metallurgy was CS.
No remarkable thickness loss in vessel bottom portion.
only the red lined portions have problem.
the flow direction is shown in sketch.
op. conditions are;
Temp;55-70degC,90 Max
press; 0.1kg/cm2
process fluid; residues of TiCl4+MgCl2+hexane
we inject Live steam(MP) from other nozzle to strip out the hexane in the drain,and neautralize the vessel by dosing caustic 20% just before beginning of decanation.
we are expecting erosion/corrosion due to flow +HCL but,the root cause is not clear.
Kindly give probable reason and remedy for the same.
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