free span for onshore pipeline

[FilippoT]

While for offshore pipelines static and dynamic analysis of free spans are managed by DNV codes (105 and 101), which are the codes to be used for such analysis in case of onshore pipeline?
Is there any references for such issues on the ASME B31.8 or B 31.4?

 

[BigInch]

Yes B31.4&8 are the correct codes for onshore pipelines (and include their respective parts for offshore lines). Span lengths are determined by the engineer. In most cases span lengths will be zero for onshore pipelines, unless you know of a specific problem where it is not, such as an aerial crossing of a short revine where the pipe is basically left exposed and possibly totally unsupported for what might be a distance as long as 10 to 15 meters for some larger diameter pipelines.

 

[LittleInch]

Straightforward stress analysis incorporating bending and axial stresses.

Spans like you get offshore are very rare onshore and when discovered are normally rectified by burial or compaction of the groundneath them.

Other than a river crossing, you don't have the effects of water, so much less forces or vibration involved.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[FilippoT]

thanks