Value analysis for equivalent roughness of pressure FRP pipe with large diameter
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Abstract:
In terms of the value pr oblem fo r the equivalent ro ug hness of pr essure FRP pipe with lar ge diameter , the water flow reg imes o f FRP pipe under different wo rking co nditions w ere analyzed using the calculation method, w hich ver ified the impor2 tance of equiv alent ro ug hness to hydr aulic calculatio ns. On the basis, JiEn formula and H aaland formula w ere used t o calculat e the head loss of small t roug h inv erted siphon with differ ent equiv alent roug hness v alues under each wo rking conditio n. The cal2 culation results w er e compared with the measured data, which sug gested that the flow r eg ime in the pr essure FRP pipe with lar ge diameter is usually in the t ur bulent tr ansit ion zo ne, and the equiv alent ro ug hness is about 0. 005 to 0. 01 mm for t he pres2 sure FRP pipe with lar ge diameter.
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