Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf Exclusive «NEWEST — FIX»

: Used primarily for water systems in civil engineering.

Industrial piping design relies on the conservation of mass, energy, and momentum. To size a pipe accurately, engineer must first establish the behavior of the fluid within the system. Fluid Flow Regimes

This leads directly to the first major decision in pipe sizing: selecting a target velocity. While velocities can range widely depending on service—water and steam piping have widely accepted recommended velocities—excessive velocity leads to high pressure drops, erosion, noise, and increased pumping costs. Low velocities lead to larger, more expensive pipes and potential settling of solids.

: Preventing erosion, noise, and water hammer. Liquids: Typically 1.5 to 3 m/s for pump discharge. Gases: Typically 15 to 30 m/s depending on pressure. Pressure Drop ( ΔPcap delta cap P

= Corrosion, erosion, or mechanical threading allowance (typically for carbon steel). tolerancetolerance : Used primarily for water systems in civil engineering

hm=K⋅v22gh sub m equals cap K center dot the fraction with numerator v squared and denominator 2 g end-fraction

: Pressure ratings are standardized into schedules (e.g., Sch 40, Sch 80). A common rule of thumb for estimating schedule is . 3. Material and Safety Factors Process Piping Fundamentals, Codes and Standards

Re=ρvDμRe equals the fraction with numerator rho v cap D and denominator mu end-fraction = Fluid density ( kg/m3kg/m cubed = Fluid velocity ( = Inside diameter of the pipe ( = Dynamic viscosity ( Laminar Flow (

Prevention: Ensure the Net Positive Suction Head Available ( NPSHAcap N cap P cap S cap H sub cap A ) exceeds Required ( NPSHRcap N cap P cap S cap H sub cap R ), and limit high-velocity throttling. 2. Liquid Slug Flow Fluid Flow Regimes This leads directly to the

Identify the mass or volumetric flow rate, operating temperature, and operating pressure. Retrieve fluid properties including density and viscosity at operating conditions.

): Converts the resistance of a fitting into an equivalent length of straight pipe. Expresses head loss as a factor of velocity head:

ΔPf=f⋅LD⋅ρv22cap delta cap P sub f equals f center dot the fraction with numerator cap L and denominator cap D end-fraction center dot the fraction with numerator rho v squared and denominator 2 end-fraction = Darcy friction factor = Length of the pipe ( = Internal diameter of the pipe ( = Fluid density ( = Flow velocity ( Finding the Friction Factor (

). It is calculated using the implicit : : Preventing erosion, noise, and water hammer

The fluid pressure inside the system during normal, steady-state plant operation.

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Once t is calculated, you add the corrosion allowance and round up to the next standard schedule number (e.g., Schedule 10, 40, 80, 160) as defined in ASME B36.10M.

ΔPfriction=f⋅LD⋅ρv22cap delta cap P sub friction end-sub equals f center dot the fraction with numerator cap L and denominator cap D end-fraction center dot the fraction with numerator rho v squared and denominator 2 end-fraction = Darcy friction factor = Length of the pipe ( For turbulent flow, the friction factor ( ) depends on the relative roughness of the pipe (

tnominal=t+c1−tolerancet sub n o m i n a l end-sub equals the fraction with numerator t plus c and denominator 1 minus tolerance end-fraction