) of the material decreases, meaning the pipe can hold less pressure.
In the United States and much of the international market, is the bible for this topic. A "better" PDF on pressure rating must walk the reader through Section 304.1.2 : the formula for minimum wall thickness required for internal pressure. ) of the material decreases, meaning the pipe
To prevent erosion, vibration, noise, and excessive pressure drop, design engineers utilize industry-standard velocity brackets: Fluid Type Typical Velocity Range (m/s) Typical Velocity Range (ft/s) 0.5 – 1.2 1.5 – 4.0 Liquid (Pump Discharge) 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 Gas / Vapor (Low Pressure) 15.0 – 30.0 50.0 – 100.0 Step 2: Calculate Preliminary Inside Diameter Using the continuity equation ( To prevent erosion, vibration, noise, and excessive pressure
Balancing the capital cost (larger pipes cost more) with operational costs (smaller pipes require higher pump power). Calculation Steps Step 1: Define process flow requirements (mass flow rate). Step 2: Choose a trial diameter (d). Step 3: Calculate velocity ( , where Q is volumetric flow, A is area). Step 3: Calculate velocity ( , where Q
= Darcy friction factor (obtained from the Moody Chart or Colebrook-White equation) = Length of the pipe ( = Acceleration due to gravity ( The Hazen-Williams Equation
with standard commercial dimensions found in codes like ASME B36.10M (for carbon steel) or ASME B36.19M (for stainless steel). Round up to the nearest available nominal pipe size, and identify its actual internal diameter based on an assumed initial schedule. Step 5: Verify Velocity and Unit Pressure Drop Calculate the exact fluid velocity and pressure gradient (