Table 1.
Site characteristics.
| Site | LC pipeline | HC pipeline |
|---|---|---|
| In situ corrosion rate∗ | <0.1 mm y-1 | 0.5–5.3 mm y-1 |
| Nitrate treatment | From inception | Started after aggressive corrosion was observed |
| Pressure support | Nitrate treated SW | Nitrate treated SW |
| In situ biomass | High | Low |
| Pipeline | 12 km, 12″ carbon steel (X65) | 10 km, 10″ carbon steel (0.5% Cr) |
| Temperature | > 80°C | 80°C |
| Oil:water ratio | 1:3 | 2:5 |
| Sulfate (mg L-1) | 980 | 121 |
| Phosphate (mg L-1) | <0.5 | <0.5 |
| Acetate (mg L-1) | 330 | 311 |
| Propionate (mg L-1) | 30 | 31 |
| Pigs analyzed | 3 and 11 | 3 and 11 |
| # Bases sequenced | 2.20 × 109 and 2.11 × 109 | 2.20 × 109 and 7.54 × 108 |
∗As determined by coupon weight loss (n = 19).