Steel pipe conveniens fiunt ex ipsum vel muro ferro pipe, laminis, profiles, ad certum figura, quae potest facere munus (mutare fluidorum directionem vel rate) in Pipeline systems. Plerumque has caeruleo includit ferro cubito (XLV seu XC gradus flectere), Tee, Reducer (concentricis aut eccentric reducer), Cross, caps, papilla et etc.