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We had a water excursion on our HF Alky recently, which after everything settled down, led to some discussions. I can find curves for the solubility of HF in iso-Butane and I can also find curves for the solubility of water in iso-Butane. I have not been able to find a curve or a means to...

metengr, Excellent!! I'll have to bring this to the attention of our materials folks. Much appreciated.

metengr, That is also my take on the matter. Unfortunately, my take is not the final say. Part of my search is to find code cases or documented instances of the use of bent pipe in hydrocarbon service with particular emphasis on H2S or HF service. We are currently of the mindset that if we...

That's the quandary I've run into. Bent pipe is recognized in the various codes put forth by ASME and ASTM as pipe not as a fitting. But because it is used in the manner of a fitting some want to apply the pertinent fitting specs. Is bent pipe that has been properly fabricated in a...

EdStainless, I have seen bent piping in lieu of fittings in catalyst transfer service which for all intents and purposes is not process piping. Failed piping in these locations can typically be replaced without impacting unit throughput. I see the value of using bent pipe in place of...

Metengr, Concentrations of HF are around 90% while temperatures range from ambient to ~150F. We are dealing with an HF Alkylation unit. I haven't been able to find any specific guidance condoning the use but on the other hand I haven't found anything prohibiting its use either. API-751...

We are having problems locating the proper fittings, especially in larger diameters, for use in hydrofluoric acid service. A106 would seem to indicate that the use of bent pipe is acceptable as long as it meets the material requirements set forth for the pipe specs. My internal inquiries bring...