Refer sketch. It shows single-level yard piping.
Regardless of service, heavy lines (very large diameter lines, large lines full of liquid) are placed over or near the piperack columns. Centrally loaded column and reduced bending moment on the beam will result in a lighter structural design. Next to these lines are placed all process lines and relief lines. Utility lines are in the centre portion of the yard. A general sequence of utility lines is also shown on the sketch.
It is advantageous, from point of view of support, to group hot lines requiring expansion loops.
Refer sketch. Loops elevated horizontally over the yard is the most common adopted design, having the hottest and largest diameter line outside.
Line guides, line stops and anchor points are usually required along a hot line somewhere in the piperack.
