Dynamic Pipeline simulation

[Nightwing]

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.

 

[shaqn2001]

hi,
how to get flange drilling specifications including thickness of flanges,BCD etc. correctly from an errected old Pipes & fittings while specification is not clear on its surface.
i'm a fresh engineer just joined a construction industry. i will be obliged if u friends guide me.

shaqn2001

 

[TD2K]

Shaqn2001, start a new thread. You are not going to attract people that can help you but putting this question in a thread on dynamic simulation.

 

[SooCS]

I am interested in this thread but since there is no one answering this thread , may be I should response this to keep it alive.

I just happened to have an old article on ethylene in Chem Eng Oct, 1981.

From an article I read, ethylene pipeline are normally operated in the supercritical region ranging from 55 bar to 125 bar. At the supercritical region the density of ethylene is about 4 times of that at vapor condition. You will therefore could have four time the capacity from the pipeline in super critical flow. Since your are operating the pipeline below 50 bar, your best bet will be the two-phase flow simulation programs. Your might want to check on the thread on two phase flow in this forum.

One interesting safety phenomena of ethylene as indicated in the article is the decomposition of ethylene that could cause pipeline to rupture especially during start up of the pipeline with purge nitrogen.

Check it out from the journal. If you cant find it in your library, I will be glad to scan you a copy.

Best of luck

 

[Nightwing]

Thanks for the reply and the reference. I did get a copy of the article and it did contain some useful info.

Thanks