1. Is there a novel way of estimating pipe roughness of a pipeline that is never in steady state?
2. Can anybody recommend a good reference on this topic. I am not so much interested in the mathematical detail, but more in:
2.1 the different scenarios that one need to look at to determine the future operating philosophy.
2.2 application of the Joule-Thompson effect in determining what size heater is required at the low pressure end of the pipeline.
2.3 Is it safe to assume a uniform temperature for the soil or should one go through all the trouble of characterising the heat-transfer properties of the soil.
2.4 The operating pressure is close to the critical pressure of the substance. Should one be concerned about liquid formation? If so, how does one handle it.
As matter of interest, the pipeline contains gaseous ethylene and is 140 km long. Under normal conditions, the delivery pressure is 50 bar and at the receiving end is 19 bar.
Regards
2. Can anybody recommend a good reference on this topic. I am not so much interested in the mathematical detail, but more in:
2.1 the different scenarios that one need to look at to determine the future operating philosophy.
2.2 application of the Joule-Thompson effect in determining what size heater is required at the low pressure end of the pipeline.
2.3 Is it safe to assume a uniform temperature for the soil or should one go through all the trouble of characterising the heat-transfer properties of the soil.
2.4 The operating pressure is close to the critical pressure of the substance. Should one be concerned about liquid formation? If so, how does one handle it.
As matter of interest, the pipeline contains gaseous ethylene and is 140 km long. Under normal conditions, the delivery pressure is 50 bar and at the receiving end is 19 bar.
Regards
