I need advice from those experienced in Sichuan on how to choose the material for urea ammonia gas pipelines.
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Parameters of the urea ammonia component: 37.5% Vol of ammonia, 18.7% Vol of carbon dioxide, 43.8% Vol of water vapor; temperature of 130–150°C, pressure of 0.48 MPa to 0.6 MPa. Based on the above components, it is planned to use a double-walled jacket steam tracing system with DN80/150 specifications, where the inner tube is made of ordinary 316L material and the outer tube is made of 304 material. Is the material choice for the inner tube appropriate?
The inner tube is made of ordinary 316L, which poses a high risk under these operating conditions; its use is not recommended. The main problem lies with the medium of **urea ammonia**, which is not exactly the same as the mixture of \"ammonia + carbon dioxide + water vapor\" that you listed. Under high temperature and pressure, they react to form **ammonium carbamate** and **urea**, which are highly corrosive.
The name of this urea ammonia gas does seem a bit inconsistent with the medium components listed; thank you for pointing that out