I work at a company called Simple-Fill located in Columbus, OH. We are currently in the process of designing a new type of natural gas compressor. I am looking into buying some rigid tubing that will be use to transfer fluids and compressed natural gas. We want to try and use carbon steel tubing, but are open to other options. We need the Outer Diameter to be 1". The tube thickness can vary, but needs to be able to handle pressures of close to 4500 psi. My first question would be if anyone has suggestions on what type of tubing to use? I was thinking Seamless Carbon Steel with 1" O.D. and at least 0.120" tube thickness. My second question is if anyone knows general pricing/ft for this type of tubing or if they can point me in the direction of companies that sell this type of tubing. The biggest issue with getting quotes has been that we only want to order about 100-200 feet of tubing. Thanks in advance.