Pipe joint such as socket, screw socket, welded seam. Is further distinguished from type attribute, which is kept in a catalog. Optional in_station (e.g.waterworks). Pipes with different materials can also be connected (material change).
The insulating pieces are used to interrupt the electrical conductivity of a pipeline or a system of cathodic corrosion protection. The question of whether this object is really used must still be clarified, since the same effect can be achieved by the network attribute for each valve (junction/device). Whether it needs this element remains to be determined in the EAP.
Caliber change between two different pipe diameters. There are also special forms which allow a change of material at the same time. In this case, the term coupling piece is used.
The tapping clamp is used for connection to a line. In this context, there is also the slide clamp / tapping slider, which combines the basic fitting of the tapping clamp with a slide valve.
A compensator is used whenever vibrations in a system need to be absorbed. As a rule, they are designed for compression, expansion, lateral displacement and for bending.