TECHNICAL MANUAL - Sharq.biz

water pipelinesThe reference standard for the laying of polyethylene pipeline systems for thetransport of fluids under pressure is the UNI 11149. This standard is applied towater networks, irrigation systems, drainage systems, fire-fighting and wastewater networks, underpressure dumps included.excavationThe trench is done at fix section; the minimum width on the bottom must be 20cm bigger than the pipe diameter to be laid.The minimum buried depth h must be of 1 meter measured from the uppergeneratrix of the pipe or 1,2 meter if subjected to raiway or air traffic, and anywayit must be evaluated according to the traffic loads and ice danger. If the minimumvalue of requested depth cannot be respected, the pipeline must be protectedwith tubular coating, cement products or equivalent materials.The width B of the trench, measured in correspondence to the upper surfaceof pipe, vary according to the pipe dimensions and must respect the minimummeasures defined in the following table:pipe diameter[mm]trench width B[mm]d e ≤ 315 d e + 400315 < d e ≤ 900 d e + 600900 < d e ≤ 1600 d e + 800d e > 1600 d e + 1200If no personnel must work inside the trench, its dimensions can be reduced.The pipeline must be laid, if possible, in correspondence to the center line of thetrench.If the trench must contain two or more pipeline systems, these must be laid ata distance bigger than at least 150 mm with respect to the width of the usedcompressing equipment.70