sisHYD creates a set of diagrams in which a target dimension is evaluated along any path in the net. The target dimensions either refer to nodes or to network elements. In the latter case stepwise representations always result.

A special diagram form represents the pressure chart in long-distance heating.

A height along a path in the network, equivalent to hydraulic pressure, is represented.

The equivalent hydraulic pressure height is calculated as follows:

pabs i i is the local absolute pressure at the junction pu, i is the local ambient pressure at the junction i

hi is the height at the junction i

ρi is the local density of the medium

g is the constant for acceleration due to gravity

The manometric pressure pmano is calculated by the difference between elevation characteristic and the equivalent hydraulic height (of a leader) under multiplication with the acceleration due to gravity constant and the local density of the medium:

In order to facilitate the reading from of pressure, an additional axis is drawn in the diagram, on which the hydraulic pressure is given.

The hydraulic pressure is calculated as

The range of values of this axis is directly coupled with the range of values on the axis "pressure height". The resulting difference of pressure can be measured directly to an elevator difference. For the conversion of this elevation difference into a pressure, an average density is assumed. Since the density differs significantly in hot water networks between flow and return, an inaccuracy in the order of magnitude of 2% arises here.