Ключевые слова:
Diameter|Length|Classification systems|Visual inspection (testing)|Regression analysis|Polymers|Water testing|Colour codes|Water supply (buildings)|Test pressure|Unplasticized polyvinyl chloride|Confidence limits|Water|Marking|Hydraulic tests|Water supply engineering|Thickness|Fracture|Performance testing|Pressure pipes|Materials in contact with food|Pipes|Impact testing|Testing conditions|Hydrostatic pressure|Fatigue testing|Polyvinyl chloride|Potable water|Plastics|Pressure testing|Test specimens|Reproducibility|Test equipment|Quality control|Opacity|t-test|Stress|Dimensions|Cold-water supply systems