API RP 1102 Calculations too High?

[fyre]

For my structural loading path class, I have been tasked with presenting a design for an oil pipeline for our class to discuss.

I have been using the API RP 1102 for the codes but all my values come out way too high to make sense. I have currently only attempted calculations for the buried part, and honestly about to just throw the whole code away and just use actual calculations. They would prefer if I can use the code though.

Let me know if you have any insight!
-Fyre

 

[CarlB]

What do you mean, values are too high?
Do they exceed allowable stress? They look low to me.
At 6 ft of cover, there shouldn't be any overstress to pipe, unless really thin walled, or being operated at a very high pressure.

 

[akpipelineengr]

Also, what kind of pipeline are you designing? Your inputs don't make sense. 3" wall thickness???? Ductile iron???

Have you read about the DAPL? If I recall correctly, the main line is 30" diameter, API 5L X70 steel pipe, up 0.625" wall thickness.