High velocities cause noise and structural vibration. Pressure Drop: High velocity = high friction losses. General Guidelines: Liquids: Gases/Steam: 2.2 Sizing by Pressure Drop
= Allowable stress value for the material at design temperature = Quality factor (weld joint efficiency) = Weld joint strength reduction factor
Master the flow, fit, and force behind industrial piping systems.
P = 11.4 bar
This module focuses on the core engineering principles required to size pipes and determine their pressure ratings. Mastering these concepts ensures operational efficiency, safety, and regulatory compliance. 1. Fundamentals of Piping Hydraulics
Focuses on overcoming frictional losses to ensure correct operating conditions and plant control.
Recommended tools and calculation aids
The friction factor depends solely on the Reynolds number:
Frictional losses occur not only in straight pipes but also due to disruptions caused by valves, tees, elbows, and expansions. These are called "minor losses" but can constitute a significant portion of total pressure drop. They are calculated using two primary methods:
The required for your project (e.g., ASME B31.3 vs. ASME B31.1 ) High velocities cause noise and structural vibration
Once the internal diameter is determined through hydraulic sizing, the pipe wall thickness must be engineered to withstand internal pressures, external loads, and environmental degradation over the design life. International Piping Codes
Gas sizing must account for compressibility. If the pressure drop exceeds 10% of the absolute inlet pressure, engineers should use compressible flow equations (such as the Weymouth or Panhandle equations) or divide the line into smaller sections for step-by-step analysis.
In the absence of rigorous economic optimization, process plants utilize conservative allowable pressure drop limits per unit length: P = 11
Teaches pipe sizing using fundamental fluid flow equations (e.g., Darcy-Weisbach or Hazen-Williams) to manage .
Piping components like flanges, valves, and fittings are grouped into standardized pressure classes governed by . These classes include 150, 300, 600, 900, 1500, and 2500.