Heating Fatty Acids in Tanks

The steam temperature and pressure for this should be moderate, and well within the capability of a steam hose. But is your hose coming into contact with the fatty acid? If so, you may need to research a hose material that can handle the fatty acid as well as the steam.

For faster melting of the fatty acid, you would need either higher steam temperature/ pressure (with suitable controls) or a coil with larger surface area. Higher steam temperature may produce localized overheating of the fatty acid, but I don't know if that would really be a problem. If so, you may need to enlarge the coil.