Model input

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Some of my experiences from daily work; I hope they can serve as a reminder for beginners. Before conducting pipeline simulations using CAESAR2, it is necessary to have a thorough understanding of the pipeline in question, including the medium used, operating conditions, flow path of the fluid, associated equipment, and branch pipes, among other things. Only by simulating the pipeline with greater accuracy can stress analysis values that are closer to the actual conditions be obtained; otherwise, the results will deviate significantly. This requires careful input data, as well as repeated consideration and verification. Taking me as an example, I calculated the temperature of a simple old pipe, which was 330 degrees. There was a branch pipe near the furnace outlet used for venting. After the calculations, it was found that the nozzles and supports were under excessive stress, which did not reflect the actual situation. After my supervisor checked my model and consulted with the owner, it was discovered that the venting branch pipe was used only at the start-up stage to release some gas; therefore, the density of the fluid in this branch pipe should be close to 0, with a temperature of around 50 degrees. Upon recalculation, the results met all the requirements. To sum up the reasons, it’s still because I wasn’t careful enough and didn’t know enough about pipes. What seems like a simple pipeline, with its design conditions taken lightly; in fact, such mistakes should have been completely avoidable. Hehe, I still need to humbly seek advice!