Corrosion in hilly-terrain pipelines

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:237684

Jepson, W P ^[1]

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1. Ohio Univ., Athens, OH (United States). Dept. of Chemical Engineering

Effect of inclination on flow regimes and flow characteristics has been examined, and the subsequent effect on corrosion has also been determined. Experiments have been undertaken in a high-pressure, 10-cm diameter, inclinable flow loop using brine, and two oils with different water cuts at pressures up to 1.13MPa and temperatures up to 90 C. They show that as the pipe is inclined upwards, the stratified flow regime virtually disappears. Slug flow now dominates the flow regime map. Between slugs, water layers at the bottom of the pipe were still found. The slug characteristics change with increase in inclination. The slug frequency is higher for the inclined flows. Further, at the lower sections of the pipe, near to the change of inclination, the slug frequency is almost double that found at distances 10--15m along the inclined pipe. The Froude numbers of these slugs are similar to those found in horizontal flows. However, values as high as 17 have been recorded. These are very turbulent slugs with regions of very high shear forces at the slug front As the slug frequency increases, the corrosion rate increases. Above 40 slugs min, the corrosion rate is very similar to that obtained by stationary slug techniques. The corrosion rates have also been found to increase with an increase in the carbon dioxide partial pressure. As the temperature was increased, the corrosion rate increased. No maximum in corrosion rate between 60 C and 80 C was noticed for all flow conditions.

• OSTI ID: 237684
• Report Number(s): CONF-9510266--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
CARBON DIOXIDE
CARBON STEELS
CORRELATIONS
CORROSION
EXPERIMENTAL DATA
FLUID FLOW
FROUDE NUMBER
GASES
INCLINATION
LIQUIDS
OILS
PIPELINES
TEMPERATURE DEPENDENCE
VELOCITY
WATER