10 - Sour Water Corrosion (Acidic)

Question 1

Corrosion of steel due to acidic sour water containing H2S at a pH between ,,,,,,,. Carbon
dioxide (CO2) may also be present.

Answer 1

Sour Water Corrosion (Acidic) or SWC

4.5 and 7.0

Question 2

The H2S concentration in the sour water is dependent on the ,,,,,,,, in the gas phaseas well as ,,,,

Answer 2

H2S partial pressure

temperature and pH.

Question 3

At a given pressure, the H2S concentration in the sour water ,,,,,,,,, as temperature increases.

Answer 3

decreases

Question 4

Increasing concentrations of H2S tend to decrease solution pH down to about ,,,,,,

Answer 4

4.5

Question 5

Streams with a pH below ,,,, indicate the presence of a strong acid which would be the main corrosion concern

Answer 5

4.5

Question 6

Above a pH of about ,,,,,, a protective, thin iron sulfide layer limits the corrosion rate

Answer 6

4.5,

Question 7

contaminants of HCl and CO2 lower ,,,,,,,

Answer 7

pH (more acidic).

Question 8

Ammonia significantly increases ,,,,, and is more often associated with ,,,,,,,,,, where the main concern is ,,,,,,,,, corrosion

Answer 8

pH
alkaline sour water
ammonia bisulfide

Question 9

300 Series SS can be used at temperatures below about ,,,,,, where Chloride Stress
Corrosion Cracking (CSCC) is not likely

Answer 9

140oF