Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf Jun 2026

). It is determined using the or calculated visually via a Moody Diagram .

Because the Colebrook-White equation is implicit and requires iterative solving, engineers often use the explicit for quick calculations:

A pipe must safely contain its internal pressure without yielding. Wall thickness calculations are governed strictly by international codes like . ASME B31.3 Wall Thickness Formula The minimum required wall thickness (

: Establishing preliminary sizes based on industry-standard velocity limits (e.g., 1–4.5 m/s for liquids) to prevent erosion, noise, and water hammer. Pressure Drop Constraints Once the pipe size is selected, you must

If the fluid is a mixture of gas and liquid (two-phase), sizing becomes complex.

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.).

When moving combinations of gas and liquid, verify the flow regime (such as slug, plug, or stratified flow) using a Baker Plot. Slug flow should be engineered out where possible, as it causes severe mechanical vibration and piping fatigue. precise wall thickness recommendations

-factor): Expresses pressure drop as a fraction of velocity head: 4. Pipe Pressure Rating and Wall Thickness

: Utilizing friction factor correlations based on pipe roughness and Reynolds number. CEDengineering.com 2. Line Sizing Methodology

I can provide target sizing calculations, precise wall thickness recommendations, or specific material grade advice based on your requirements. Share public link Once the pipe size is selected

t = (P·D) / (2·(S·E + P·Y))

A piping system is only as strong as its weakest component. While pipe is fabricated, flanges are cast/forged components with pre-defined ratings.