Fittings (bends, tees, reducers) and valves introduce turbulence. They are calculated using the resistance coefficient (
1f=-2log10(ε/D3.7+2.51Ref)the fraction with numerator 1 and denominator the square root of f end-root end-fraction equals negative 2 log base 10 of open paren the fraction with numerator epsilon / cap D and denominator 3.7 end-fraction plus the fraction with numerator 2.51 and denominator cap R e the square root of f end-root end-fraction close paren is the absolute roughness of the pipe material (e.g., for commercial steel). 2. Pipe Sizing Methodology
Once the pipe size is selected, you must ensure it can withstand its internal pressure without failing. This is the pressure rating section of the module. The primary tool for this is the (applicable to petroleum refineries, chemical plants, pharmaceutical plants, etc.). Pipe Sizing Methodology Once the pipe size is
= Allowable stress value for the material at design temperature ( MPacap M cap P a = Quality factor (weld joint efficiency) = Weld joint strength reduction factor
For flanges, use classes:
Where:
The fundamental equation for fluid flow relating pressure, velocity, and elevation. $$P_1 + \frac12\rho v_1^2 + \rho g h_1 = P_2 + \frac12\rho v_2^2 + \rho g h_2 + \textLosses$$ = Allowable stress value for the material at
When designing process piping, several key considerations must be taken into account: