Does anyone have any experience with the performnace of superduplex stainless steels (UNS S32760 or S32750) in caustic solutions (10% NaOH wt) with 1% - 5% sulfides wt. at temperatues around 250 F? Thanks.
Does anyone have experiece with sizing the rich caustic level control valve on a mercaptan extractor in butane service? If so, can this valve be sized with the assumption that the vapor pressure of the rich caustic is very low which allows the actual valve pressure drop be used in the liquid...
I am aware of a general design guideline to limit the velocity of rich amine in carbon steel piping to 3 fps. Does anyone have an opinion on the max. allowable velocity in 316SS tubes in the rich/lean exchanger? Thanks.
Can anyone suggest the maximum tube length to shell diameter ratio that would make bundle handling difficult from the bundle being "too springy"? I have seen a number of 15:1, am wondering if anything higher is unreasonable. Thanks.
I am aware of a general design guideline to limit the velocity of rich amine in carbon steel piping to 3 fps. Does anyone have an opinion on the max. allowable velocity in 316SS tubes in the rich/lean exchanger? Thanks.
Does anyone have any experience with alloy selection for a boiling 10% wt. NaOH containing 3% Na2S? Temp. is 250 F and pressure is 10 psig. Normally we would use Monel for this application but are concerned with sulfides. Also considering Inconel 600 and Duplex SS (Alloy 2205). Thanks.
Can anyone explain the corrosion mechanism of Na2S to carbon steel in 200 - 250 F aqueous caustic solutions (10% wt. NaOH)? General guidelines in the GPSA manual indicate that Na2S in circulating caustic systems for RSH removal from LPG should be kept at 0.2% wt or less to reduce corrosion...
Can anyone explain the corrosion mechanism of Na2S to carbon steel in 200 - 250 F aqueous caustic solutions (10% wt. NaOH)? General guidelines in the GPSA manual indicate that Na2S in circulating caustic systems for RSH removal from LPG should be kept at 0.2% wt or less to reduce corrosion...
Can anyone explain the corrosion mechanism of N2S to carbon steel in 200 - 250 F aqueous caustic solutions (10% wt. NaOH)? General guidelines in the GPSA manual indicate that Na2S in circulating caustic systems for RSH removal from LPG should be kept at 0.2% wt or less to reduce corrosion, but...
Can anyone provide a reference for sizing flashing liquid control valves when the base liquid contains a significant amount of a dissolved gases, but the liquid itself (exclusive of the dissolved gases) is well below its bubble point?
The traditional method outlined in the Fisher Catalog...
I am analyzing a control valve on the liquid effluent from a two phase (liquid/vapor) flash drum. The liquid is a physical solvent (Selexol) and contains approx. 8% (wt.) CO2. The pressure at the valve’s inlet flange is 185 psig, which is basically the flash drum’s pressure. The pressure at...
I am wondering if anyone can offer guidance on the proper reference conditions (i.e. temperature and pressure) for k (Cp/Cv) for use in the API 520 critical vapor flow equation for multi component mixtures? In most of the examples in API520, they reference a table that lists k values at standard...
