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Overview of HCl-Compass Corrosion Prediction Software

HCl-Compass is the only device and OS independent predictive software on the market for the modeling and prediction of corrosion by aqueous hydrochloric acid and dry HCl gas. Designers, engineers, consultants, maintenance and inspection personnel can quickly assess and quantify the impact of process variables on the corrosion rate and the remaining life of piping, vessels, and other equipment handling hydrochloric acid in aqueous or gaseous phases.

Figures below demonstrate the operation of HCl-Compass. With HCl-Compass, corrosion prediction and materials selection for hydrochloric acid services are as easy as 1-2-3.

(1) Select the material from the dropdown list,

(2) Enter the temperature and the concentration of hydrochloric acid (or the pH, or the chloride concentration)

(3) Review the prediction results

HCl-Compass predicts the specific gravity, the freezing point, and the boiling point of the hydrochloric acid (HCl), the corrosion rate of the selected alloy at the specified temperature and concentration or pH, and the remaining life of the component. In addition to that, HCl-Compass also plots the isocorrosion diagram for the selected alloy so as to give users a complete picture of the corrosion behavior of the selected alloy across the entire ranges of the HCl acid concentration and the service temperature.

Figure 1 HCl-Compass Predicts the Corrosion Rate of Alloys in Hydrochloric Acid Corrosion Services

Figure 2 HCl-Compass Predicts HCl Corrosion and Simplifies Materials Selection for Hydrochloric Acid Services

The following corrosion resistant alloys for aqueous HCl services are included in HCl-Compass software:

Carbon Steel
Type 304/304L
Type 316/316L
Type 321
Type 347
Alloy 31
Alloy 59
Hastelloy B-2
Hastelloy B-3
Hastelloy C-2000
Hastelloy C-276
Hastelloy C-4
Hastelloy C-22
Hastelloy G-30
Hastelloy(r) G
Hybrid-BC1
Inconel 622
Inconel 625
Inconel 686
Incoloy 256Mo
Incoloy 825
Monel 400
Zirconium

For equipment and piping systems directly handling hydrochloric acid, users can use the acid concentration (wt%) as input parameter to predict the HCl corrosion rate (Figure 3). For dilute HCl condensate as is the case in HCl transmission tubing in plants manufacturing microchips and semiconductors and in crude distillation, hydrotreating, and catalytic reforming units in oil refineries where HCl forms by the hydrolysis of magnesium and calcium chloride salts and results in dilute HCl in the overhead system, users can choose to use pH or chloride concentration (in ppmw) as the input parameter to predict the HCl corrosion rate (Figures 4-5).

Figure 3 HCl-Compass Predicts and Models the Effects of HCl Concentration, or pH, or Chloride Concentration on the Corrosion Rate

Figure 4 HCl-Compass Predicts and Models the Effects of pH on HCl Corrosion

Figure 5 HCl-Compass Predicts and Models the Effects of Chloride Concentration on HCl Corrosion

HCl-Compass also predicts corrosion by dry hydrochloric acid gas at high temperature (Figures 6-7). The software provides a cost-effective solution to selection of materials for piping, vessels, and other equipment handling dry hydrochloric acid gas.

HCl-Compass, giving you the right directions in HCl corrosion prediction and materials selection.

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