Method for installation of a pipe based system (pipe system) comprising pipe lengths and coupling components, distinguished in that the method comprises the steps: to pre-assemble the pipeline system loosely by assembling pipe lengths and coupling components by inserting pipe lengths into coupling parts, the coupling parts are adapted so as to hold the pipe length in place and in orientation while the axial pipe length position in the coupling component easily can be adjusted, and conduct optional sufficient clamping or attachments to the surrounding walls, ceilings or floors, so that the pipe system is self-supporting in the intended position and such that the assemblage of the components easily can be adjusted by a technician, to adjust the components of the pipeline system into the intended position, so that the pipeline system is basically without any inherent tensions, optionally to attach or clamp the pipeline system further onto to the surrounding walls, ceilings or floors, and to permanently join the pipe lengths and coupling components.