Buoyancy/Hydrostatic LoadingUnder hydrostatic loading, submerged piping is subject to an upward buoyant force (Fb) which reduces the (above water) self

weight of the pipe (W) as shown by Equation E-1. In the absence of fluid motion, only the vertical forces depicted in the free body diagram shown in Figure E-2 are nonzero.

(E-1)

Figure E-1 shows an arbitrary submerged pipe element, and the buoyant forces calculated by AutoPIPE.

Figure E-1

BuoyancyA body submerged in fluid is subjected to a vertical force which is proportional to the volume of the displaced fluid. The magnitude of this force is given as:

(E-2)

where

The Buoyancy command can be used to include the buoyant effect in the gravity load case (GR). AutoPIPE treats buoyant forces as a uniformly distributed load acting along the submerged length of pipe. If the location of the water surface with respect to the piping points is expected to significantly influence the buoyancy analysis results, closely spaced points in the vicinity of the water surface, preferably with a point located at the water surface should be used to obtain an accurate discretization of the loading.

= specific weight of the fluid

V = volume of fluid displaced by the body

AutoPIPE Reference Information

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