use and where and tear of the coaxial piping system by absorbing and equally distributing such vibrations over the length of the coaxial piping system and substantially preventing the inner conduit 10 from vibrating within the outer conduit 11 thereby preventing stress fractures that would otherwise be caused by such vibrations fig2 and 3 illustrates the process of construction of a straight line of coaxial piping embodying the present invention helical spacer 12a is inserted about the inside diameter of outer conduit 11a thereby forming a combination thereof inner conduit 10a is inserted within the combination of outer conduit 11a and helical spacer 12a such that as stated helical spacer 12a fits snuggly within volume 13a between the inner conduit 10a and the outer conduit 11a the same steps are performed with respect to helical spacer 12b outer conduit 11b and inner conduit 10b a first inner conduit 10a is brought into contact with a second inner conduit 10b so that their ends abut at 14 the abutting ends of 10a and 10b are then butt welded together at 14 and leak tested the outer conduits 11a and 11b having respectively helical spacers 12a and 12b are slid into position such that their ends abut one another at 17 and so that outer conduit 11b covers the inner conduit weld joint at 14 the abutting ends of the outer conduits 11a and 11b are then welded together forming a weld joint at 17 and leak tested in fig4 there is shown a partial cross sectional view of an elbow of the coaxial.