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Corrosion poses a major risk to many industrial facilities such as pipelines, storage tanks, and equipment. To estimate the design life or residual life of an industrial component, corrosion rate data for a given material-environment must be known. Using the well-established corrosion predictive models, WebCorr's corrosion simulation and corrosion modeling services will provide the essential corrosion rate data to your design team and the maintenance personnel, making possible a more realistic estimation of the design life or residual life of your pipelines, storage tanks and other equipment.
In the case illustrated below, corrosion modeling is the only solution to establish the safe operation limits (temperature, concentrations of impurities) for the tanks carrying phosphoric acid.
From: [removed ]
Dear Prof Qiu,
We are a ship-owner with a fleet of stainless steel ocean-going tankers.
Our ships carry Phosphoric Acid cargo from time to time. We would like to know whether a particular grade of Phosphoric Acid is suitable for our stainless steel tankers. We are not able to provide the phosphoric acid sample to you. However we can provide the specifications of phosphoric acid to you. For example:
P2O5 49.0 - 51.0
Sp. Gr 1.65 - 1.67
Fe2O3 min 0.65 pct
Al2O3 min 0.8 pct
MgO 0.45 - 0.55
CaO 0.15 - 0.25
K2O 0.06 - 0.08
Na2O 0.7 - 0.95
SO4 max 4.0 pct
F max 0.8 pct
Cl max 200 ppm
Solids max 1.0 pct
Temp max 45 deg C
Total voyage time about 12-15 days.
Question – can this grade of Phosphoric Acid be carried on our ship cargo tanks made of 316L 2.1% Mo and of 316L 2.7% Mo?
If it cannot be carried because of certain parameters out of limits, please advise the max limits allowed and if the temp is too high, what the max temp allowed?
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