Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf
: The primary method for calculating head loss ( hLh sub cap L ) due to friction: Moody Diagram : Used to find the friction factor ( ) based on pipe roughness and the Reynolds number.
): A fluid's resistance to gradual deformation by shear or tensile stress. High-viscosity fluids require more pumping power. Vapor Pressure ( Pvcap P sub v
What are your and operating temperature specifications?
: Calculations ensure that the pressure loss across the system stays within allowable limits to prevent equipment strain, such as pump cavitation. 2. Pressure Rating and Wall Thickness : The primary method for calculating head loss
Choose an acceptable velocity range based on fluid properties.
To deepen your understanding, the following documents are excellent resources. While many require purchase or institutional access, they represent the core knowledge base of the industry.
Nominal Thickness≥tm0.875Nominal Thickness is greater than or equal to the fraction with numerator t sub m and denominator 0.875 end-fraction Vapor Pressure ( Pvcap P sub v What
This diagram illustrates how the three core disciplines of process piping design are integrated in a real-world engineering workflow:
Understanding fluid behavior is the first step in sizing. The relationship between velocity, diameter, and flow rate is governed by the . Hydraulics: Fluid Flow in Pipes | PDF - Scribd
Once the minimum required thickness is calculated, the next step is to select a commercially available pipe from standard "schedules" (e.g., Schedule 40, Schedule 80). The pipe's nominal wall thickness must equal or exceed t_min . These standard thicknesses are directly linked to a pipe's pressure rating at a given temperature. Pressure Rating and Wall Thickness Choose an acceptable
= Weld joint strength reduction factor (for elevated temperatures) = Coefficient valid for valid (depends on material and temperature) To find the , mechanical and structural allowances must be added:
: Ensuring the total pressure drop (including major losses in straight pipe and minor losses in fittings/valves) does not exceed the available system pressure. Economic Sizing