Online Process and Corrosion Calculations      

The Hendrix Group has developed several online process and corrosion calculations for the chemical and refining industries. The source material for the calculations is technical literature (API, NACE and others) in the public domain, and full references are provided. A lot of good research has been done over the years. To fully understand the context of diagrams published in standards, we like to dig down to original source material. Some of our sources are hard-to-find historical papers. 

Calculations offer the choice of US customary and metric units. The results of the calculations are illustrated with charts where this is helpful.

The links below provide access to the descriptions of online calculations that will be available free of charge for registered users.  

• p_H2S and p_NH3 in Sour Water Vapour

• H₂S, NH₃ and NH₄HS in Alkaline Sour Water

• Solubility of CO₂ in Water

• Solubility of H₂S in Water

• Solubility of O₂ in Saline Water

• Water Dewpoint and Humidity (available)

• Alkaline Sour Water Corrosion

• Corrosion Rates of Carbon Steel in Water

• Deposition Temperatures of Ammonium Salts (API RP 932-B) (available)

• NACE MR0175 – Determination of SSC Regions and Acidic Sour Water Corrosion (available)

• API RP 581 – Amine Corrosion of Carbon Steel and Stainless Steel (June 2022)

• API RP 581 – Dilute Hydrochloric Acid and Organic Acids

• API RP 941 – High-Temperature Hydrogen Attack, based on Nelson Curves (incl. Cladding) (available)

• API RP 581 – High-Temperature Oxidation Rates (incl. Creep and Scaling Temperatures)

• API RP 581 – Naphthenic Acid Corrosion

• Sulfidic Corrosion (H₂-Free), based on Modified McConomy Curves  (available)

• Sulfidic Corrosion (H₂-H₂S), based on Couper Gorman Curves (available)