Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf Exclusive 〈Working ★〉

: Piping must be sized to avoid excessive velocity, which causes high pressure drops, noise, and erosion. Internal Diameter (ID) : Calculated as ODcap O cap D is the outside diameter and is the wall thickness.

Piping hydraulics focuses on the principles governing the flow of liquids and gases through pipes. Understanding these principles ensures that the chosen pump or compressor can deliver the required flow rate and pressure. Key Principles: . As pipe diameter decreases, velocity increases. Conservation of Energy (Bernoulli’s Equation):

These questions are interconnected. A pipe that is too small creates an excessive pressure drop, requiring a larger, more expensive pump. A pipe that is too large wastes capital on unnecessary material. A wall that is too thin risks a catastrophic rupture.

t=PD2(SEW+PY)t equals the fraction with numerator cap P cap D and denominator 2 open paren cap S cap E cap W plus cap P cap Y close paren end-fraction = Pressure design wall thickness ( = Internal design gage pressure ( MPacap M cap P a = Outside diameter of the pipe (

): The flow fluctuates between laminar and turbulent behavior. Avoid designing systems in this unpredictable zone. Turbulent Flow ( : Piping must be sized to avoid excessive

Standard commercial manufacturing variation, typically assumed to be for seamless steel piping. Flange Pressure-Temperature Ratings

Are density and viscosity verified at the maximum operating temperature?

Leq=K⋅Dfcap L sub e q end-sub equals the fraction with numerator cap K center dot cap D and denominator f end-fraction 3. Piping Sizing Methodology Criteria for Economic Pipe Diameter

Maintaining fluid velocities within recommended windows prevents erosion, noise, water hammer, and excessive pressure drops. Fluid Service Recommended Velocity Range (m/s) Recommended Velocity Range (ft/s) Pump Suction (Liquids) 0.5 – 1.3 1.5 – 4.0 Pump Discharge (Liquids) 1.5 – 3.0 5.0 – 10.0 Steam (Saturated) 30.0 – 40.0 100.0 – 130.0 Steam (Superheated) 40.0 – 60.0 130.0 – 200.0 Gases / Vapors (Low Pressure) 15.0 – 30.0 50.0 – 100.0 3. Calculating Friction and Pressure Drops Understanding these principles ensures that the chosen pump

Where the complexity lies is in the friction factor ($f$). In modern engineering, this is solved using the or the Moody Chart .

Where is design pressure, D is outside diameter, S is allowable stress, and E is the quality factor.

: Scale the calculated thickness upward to account for corrosion and manufacturing tolerances, then choose the final pipe schedule.

). This value dictates whether the flow profile is predictable or chaotic: it’s about economic and functional optimization.

Once the hydraulic diameter is locked in, the piping engineer must determine the pipe wall thickness required to safely contain the internal operating pressure at the design temperature. Applicable Design Codes

Sizing is not just about fitting the pipe; it’s about economic and functional optimization.

Pressure drop calculations ensure that pumps or compressors have enough head to deliver fluids to their destinations. Darcy-Weisbach Equation