@gerhardl missing viscosity, spec.gravity, temperature, i found which TRIM should i use, its A4 with corrosion allowance . 250'' 150#RF, - 29/399 DEGREES CELSIUS and its sour water with wet h2s, design ansi b16.5,nace mr-01-75/78 with radiography 10% and brinell 100..i just need to know how can...