The document compares the costs of solid wall pipes, clad pipes, and lined pipes using Alloy 625 as the liner material. Clad pipes are 36% more costly than solid pipes, while lined pipes are 18% more costly than solid pipes and 50% more costly than clad pipes. Lined pipes using AISI 316L or Duplex 2205 as the liner are 30% more costly than solid pipes and 50% more costly than clad pipes, which are 60% more costly than solid pipes. A key advantage of lined pipes is there are unlimited choices of liner materials that are abundantly available, while clad and solid pipes have limited suppliers due to more complex manufacturing processes.