ASTM Piping Materials for Carbon Dioxide service
ASTM Piping Materials for Carbon Dioxide service
(OP)
We are designing a process unit that has a gas flow with the following composition : 14mol%CO2,84%CH4,the rest is Ethane, Propane, Butane and Pentane. The various lines operate at 75 barg with temperatures ranging from 50°C to 230°C with a water content of 0.2 to 1.7 mol% and a 1% vapour fraction. Could anyone comment on our intention to use 304 material for the pipelines ?
We have another line operating at 75 barg and 300°C with the same composition but with no water present, we were considering using carbon steel for this line. Any thoughts ?
We have another line operating at 75 barg and 300°C with the same composition but with no water present, we were considering using carbon steel for this line. Any thoughts ?





RE: ASTM Piping Materials for Carbon Dioxide service
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: ASTM Piping Materials for Carbon Dioxide service
RE: ASTM Piping Materials for Carbon Dioxide service
It depends what you mean by unsuitable. Carbon steel could be very suitable if you only need the line for 6 months. The general approach is to assess suitability based on life cycle costing. To that end, you need some means of predicting how long your carbon steel line will last and whether, or how many times, it will have to be replaced during the lifetime of the facilities. Then, as you know it will degrade in service, there will be the operating expenditure of having to perform inspections to ascertain the level of technical integrity and so on and so on. The first port of call is to determine the expected corrosion rate of carbon steel. It is a relatively common question and various threads can be reviewed:
thread338-121748
thread601-115896
thread338-111687
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: ASTM Piping Materials for Carbon Dioxide service