AutoPIPE includes the following standards for calculating seismic acceleration:

- A.L.A. 2002
- ASCE 2010
- China GB50011 2001
- Mexico CFE 2008
- User

AutoPIPE handles up to **30** seismic acceleration vectors simultaneously. To facilitate the
equations,
the horizontal accelerations are combined with the vertical ones, so eight vectors are required to
cover the most used vectors.

It is becoming more and more common to pre-fabricate modules at Skids and transport them to the job site for assembly. In this case, it is necessary to have four additional vectors to perform the transport acceleration calculation (No fluid in the pipes).

AutoPIPE Buried Model includes the pipe and its content mass, considering their density and therefore allowing many weight-related analyses like seismic, settlement, buoyancy, etc. Notice that other software change densities to zero for buried elements.

Seismic analysis can be performed in three ways:

**Static Seismic Acceleration**can be applied to the model.**Spectrum analysis**can be performed.- Seismic waves travel faster in the pipe than through the ground, AutoPIPE can apply a
**Thermal Equivalent**of the wave propagation which makes it the preferred solution for studying pipelines.

Seismic accelerations are calculated for the plant at ground level. For multi-level installations, simply
multiply the basic design acceleration by the **amplification factor** of its height. This is because
elevated structures have a greater seismic displacement as height increases. In general, seismic
standards ask to multiply by:

\(F = 1 + \frac {2 z}{h}\)

Where z is the support height and h is the height of the structure. So F has a value ranging from 1 to 3.

In AutoPIPE it is very easy to apply this factor, since it is not necessary to modify the seismic accelerations, but rather select the pipes with the “Elevation Range” tool and apply the factor to each section.