DIN CEN/TS 15223
DIN CEN/TS 15223 Plastics piping systems - Validated design parameters of buried thermoplastics piping systems; German Version CEN/TS 15223:2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2008