Anticorrosion Coatings based on a Water-Bitumen-Polymeric Composite with High Rates of Formation

Influence of the Accuracy of Determining the Inner Diameter of Pressure Polyethylene Pipes by the Amount of Head Loss by Length

“…The main evaluation performance criterion for the efficiency of pipelines from polymeric materials is the hydraulic potential of the pipeline. It is characterized by a set of flow rates q at a given pressure PN, the average flow rate V, and the friction loss over the length of the pipeline i [9][10][11][12][13][14][15][16].…”

“…In the current All Union State standard 18599-2001 for polyethylene pipes introduced the concept -the nominal outside diameter d. According to ISO 161-1-2004 this value is the minimum average external diameter d em , which, in turn, is the measured outer perimeter of the pipe divided by the number π (3,142), rounded up to 0.1 mm [11]. In accordance with All Union State standard 18599-2001, the definition of "design internal diameter of a pipe" is introduced only by the value of the nominal wall thickness e, also contained in ISO 4065 and corresponding to the minimum permissible wall thickness at any point of the pipe, e min -as a normative.…”