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Frequently used formulas in pipeline construction; 1. h = f(LV 2 /2Dg) h : Head loss (m) L : Length of pipeline (m) D: Diameter of pipe (m) (Normally nominal diameter presented in meter is used.) V: Flow velocity (m/s) g : Acceleration of gravity (= 9.8 m/s2) f : Head loss coefficient 2. For water pipeline, Hazen-Williams formula is commonly used. V = 0.35464C H D 0.63 I 0.54 Q = 0.27853C H D 2.63 I 0.54 I = 10.666 C H -1.85 D -4.87 Q 1.85  Where, CH : Coefficient For cement mortar or epoxy lined ductile iron pipe, a CH value of 150 can be used; however for design purpose, 130 is recommended, which includes losses in fittings, valves and other facilities, plus some allowance. I : Hydraulic gradient (unit head loss of the pipeline) = h/L Q : Flow volume (m3/s)

Safety First: Essential Safety Practices in Water Pipeline Construction (Ductile Iron Pipe) “Safety First” is not just a slogan—it is a fundamental principle that must guide all construction activities. Given the diverse nature of construction work, safety measures vary depending on the type of activity. However, certain core principles—such as worker safety and public (third-party) safety—remain universally applicable. This document outlines key safety practices specifically relevant to water pipeline construction, particularly for Ductile Iron Pipe (DIP) installations. 1. Site Safety and Access Control Prior to the commencement of any construction activity, the work zone must be clearly demarcated using safety barriers, cones, and caution tapes. The Site Manager must verify that all protective measures are properly installed before authorizing work to begin. Unauthorized personnel and third parties must be strictly prohibited from entering the designated work area. 2. Worker Sa...