How to calculate piping diameter and thikness according to ASME B31.4 Pipeline Transportation Systems for Liquids and Slurries ?

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0 | ## How does ASME B31.4 dictate the calculation of piping diameter and thickness for a liquid pipeline transporting a specific slurry (e.g., coal slurry) with known flow rate, pressure, and temperature, considering factors such as erosion, corrosion, and potential for external loading?
**What are the key sections and clauses within ASME B31.4 that govern piping diameter and thickness calculation for slurry pipelines?****How does the code handle the unique challenges posed by slurry transport, like erosion and abrasive wear, in determining the required pipe wall thickness?****What design considerations and calculations are necessary to ensure adequate structural integrity of the pipe under various external loads (e.g., seismic, wind, soil pressure)?****Can you provide an example calculation for determining the pipe diameter and thickness using ASME B31.4 for a specific slurry pipeline scenario?**
This detailed question aims to understand the comprehensive methodology outlined by ASME B31.4 for calculating piping diameter and thickness in slurry pipeline systems, highlighting the code's provisions for handling specific challenges associated with such applications. asked July 28, 2024, 1:43 p.m. wisankoi 0 0 0 gold badges 0 0 silver badges 0 0 bronze badges |

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0 | ## Calculating Piping Diameter and Thickness According to ASME B31.4ASME B31.4, "Pipeline Transportation Systems for Liquids and Slurries," provides guidance on the design and construction of pipelines. Determining the optimal pipe diameter and thickness involves a multi-step process, considering factors like flow rate, fluid properties, pressure, and allowable stress. Here's a breakdown of the process:
**Flow Rate (Q):**This is the volume of fluid passing a given point in the pipeline per unit time (e.g., gallons per minute).**Fluid Density (ρ):**This is the mass per unit volume of the fluid (e.g., kg/m³).**Fluid Viscosity (μ):**This measures the fluid's resistance to flow (e.g., Pa·s).**Vapor Pressure (Pv):**This is the pressure at which the fluid will vaporize at a given temperature.
**Flow Velocity (v):**First, determine the desired flow velocity based on factors like erosion, wear, and pressure drop. A typical range is 3-6 ft/s for liquids and 2-4 ft/s for slurries.**Calculate the Cross-Sectional Area (A):**Using the flow rate (Q) and desired velocity (v), calculate the required cross-sectional area of the pipe using the formula:
**Determine the Pipe Diameter (D):**Knowing the cross-sectional area (A), calculate the pipe diameter (D) using the formula for the area of a circle:
**Operating Pressure (P):**This is the pressure inside the pipeline during operation.**Allowable Stress (S):**This is the maximum stress the pipe material can withstand at the operating temperature. It is determined based on the pipe material and the allowable stress values specified in ASME B31.4.**Corrosion Allowance (CA):**This is an allowance for potential corrosion of the pipe over its lifetime.**Minimum Wall Thickness (tm):**This is the minimum thickness required for structural integrity, and it's typically specified by the pipe manufacturer.**Calculate the Required Wall Thickness (t):**The required wall thickness is calculated using the following formula:
**Where:****P**is the operating pressure.**D**is the pipe diameter.**S**is the allowable stress.**CA**is the corrosion allowance.**tm**is the minimum wall thickness.
- Choose a pipe material based on factors like:
**Fluid compatibility:**The material should be resistant to corrosion from the fluid.**Temperature:**The material should be able to withstand the operating temperature.**Pressure:**The material should have sufficient strength to handle the operating pressure.**Cost:**The material should be cost-effective.
- After determining the pipe diameter and thickness, select the appropriate pipe schedule from ASME B31.4. This will define the actual pipe thickness and wall thickness based on the diameter and material chosen.
**Hydrostatic Testing:**After installation, the pipeline needs to undergo hydrostatic testing to ensure it can withstand the operating pressure.**Inspection and Maintenance:**Regular inspections and maintenance are crucial to ensure the pipeline's safe operation.**Safety Factors:**ASME B31.4 includes safety factors in its calculations to account for uncertainties and potential variations in operating conditions.
answer July 28, 2024, 1:43 p.m. mohacamay 0 0 0 gold badges 0 0 silver badges 0 0 {% trans "bronze badges" } |

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