How to calculate piping diameter and thikness according to ASME B31.3 Process Piping Design ?

Asked **3 months, 2 weeks** ago | Viewed **900**times

1 | ## How does ASME B31.3 Process Piping Design recommend calculating the optimal diameter and thickness for piping systems based on fluid properties, operating conditions, and material considerations?
**What are the key parameters and considerations that ASME B31.3 takes into account when determining piping diameter and thickness?**(e.g., fluid properties like density, viscosity, flow rate, pressure, temperature, allowable stress, corrosion allowance, etc.)**Describe the different methods and formulas used in ASME B31.3 for calculating pipe diameter and thickness, including:****Velocity-based calculations:**How are fluid velocity and flow rate used to determine the minimum pipe diameter?**Pressure-based calculations:**How are pressure, material properties, and operating conditions considered in calculating the required pipe wall thickness?**Stress-based calculations:**How does ASME B31.3 address stress analysis and fatigue life in determining pipe dimensions?
**What are the potential trade-offs and limitations associated with different calculation methods?****How does ASME B31.3 account for potential corrosion and erosion during pipe design and determine the appropriate corrosion allowance?****What are some practical considerations and design considerations for choosing the appropriate pipe diameter and thickness beyond the strict calculations?****What resources and tools are available to assist engineers in applying the ASME B31.3 guidelines for pipe sizing and thickness calculations?**(e.g., software, online calculators, reference materials, etc.)
By addressing these points, this detailed question aims to provide a comprehensive understanding of the principles and practicalities of calculating piping diameter and thickness according to ASME B31.3 for process piping design. |

comment question | |

## 1 Answer(s) | |

1 | ## Calculating Piping Diameter and Thickness According to ASME B31.3ASME B31.3, Process Piping, provides comprehensive guidelines for designing and constructing process piping systems. Here's a breakdown of the process for calculating pipe diameter and thickness, along with the relevant formulas:
**Fluid Type:**Identify the fluid flowing through the pipe. Its properties (density, viscosity, etc.) are critical for pressure drop calculations.**Flow Rate:**Specify the required volume flow rate (e.g., gallons per minute, cubic meters per hour).**Operating Pressure:**Determine the maximum internal pressure the pipe will experience during operation.**Operating Temperature:**Identify the maximum and minimum temperatures the pipe will encounter.**Corrosion Allowance:**Consider the potential for corrosion and add an appropriate allowance to the required wall thickness.
**Fluid Velocity:**Choose a suitable fluid velocity based on factors like:**Fluid Type:**Different fluids have different acceptable velocities.**Erosion:**High velocities can cause erosion, especially for abrasive fluids.**Noise:**Excessive velocity can lead to noise and vibration.
**Flow Area:**Use the flow rate and desired velocity to calculate the required flow area (A) using:**A = Flow Rate / Velocity**
**Pipe Diameter:**Calculate the inner diameter (ID) of the pipe using the flow area and the formula for the area of a circle:**A = π * (ID/2)^2**
**Pressure Design Basis:**ASME B31.3 provides several design basis options:**Design Pressure (P):**The maximum allowable pressure for the pipe.**Internal Pressure (Pi):**The pressure inside the pipe.
**Stress Factors:****Stress Intensity (S):**The allowable stress for the pipe material at the operating temperature. You'll need to refer to material specifications and ASME B31.3 tables for these values.**Joint Efficiency (E):**A factor that accounts for the strength of the welded joint (typically 0.85).**Design Factor (F):**A safety factor to account for uncertainties (generally 0.72 for normal service, 0.60 for high-pressure service, and 0.40 for severe service).
**Corrosion Allowance (CA):**Add this to the calculated wall thickness to account for potential corrosion over the pipe's lifespan.**Thickness Calculation:**Use the following formula to calculate the minimum required wall thickness (t):**t = (P * D) / (2 * S * E * F - P) + CA****Where:****t:**Minimum required wall thickness**P:**Design Pressure (internal pressure)**D:**Outside diameter of the pipe**S:**Allowable stress**E:**Joint efficiency**F:**Design factor**CA:**Corrosion allowance
**Schedule:**Pipe wall thickness is standardized in schedules (e.g., Schedule 40, Schedule 80).**Select:**Choose the nearest standard pipe size and schedule that meets or exceeds the calculated wall thickness.
**Pipe Material:**Choose a suitable material based on:**Corrosion Resistance:**Consider the fluid's corrosivity and select a material that can withstand it.**Temperature Rating:**Choose a material with a suitable temperature rating for the operating conditions.
**Pipe Supports:**Design appropriate pipe supports to withstand the weight of the pipe and its contents, including thermal expansion and contraction.**Insulation:**Consider the need for insulation to prevent heat loss or gain and maintain operating temperatures.
Let's say you have a process piping system carrying a fluid with the following characteristics: **Fluid:**Water**Flow Rate:**100 gallons per minute (gpm)**Operating Pressure:**150 psi**Operating Temperature:**150°F**Corrosion Allowance:**0.125 inches
**Velocity:**Assume a velocity of 5 ft/s for water in a piping system.**Flow Area:**A = 100 gpm / (5 ft/s) = 20 gpm/ft/s = 0.154 ft^2**Pipe ID:**0.154 ft^2 = π * (ID/2)^2 -> ID = 0.44 ft = 5.28 inches
**Design Pressure:**Assume a design pressure (P) of 175 psi (higher than the operating pressure for safety).**Material:**Assume carbon steel pipe with an allowable stress (S) of 17,000 psi at 150°F.**Joint Efficiency:**Assume E = 0.85.**Design Factor:**Assume F = 0.72 for normal service.**Thickness:**t = (175 psi * 5.28 inches) / (2 * 17,000 psi * 0.85 * 0.72 - 175 psi) + 0.125 inches = 0.25 inches.
**Schedule 40:**This schedule has a wall thickness of 0.218 inches, which is less than the required 0.25 inches.**Schedule 80:**This schedule has a wall thickness of 0.312 inches, which meets the requirement.
Therefore, based on these calculations, you would choose a 5.28-inch OD pipe with a Schedule 80 wall thickness for this process piping system.
answer July 28, 2024, 12:56 p.m. valdout39 0 0 0 gold badges 0 0 silver badges 0 0 {% trans "bronze badges" } |

comment Answer | |

What is Conductivity (fracture flow) used in Reservoir Engineering?

How to use Monte Carlo similation using python to similate Project Risks?

What is the scientific classification of an atom?

What is a neutron?

neutron electron proton atome three-phase electrical 220V Conductivity flow fracture reservoir Commitment Agreement planning Technical Guide scheduling bailer drilling Storage Quality Control QA/QC Regulatory Audit Compliance Drilling Completion logging Heading Well Offsite Fabrication Éthique Probabilité erreur intégrité Gestion actifs indexation Outil Zinc Sulfide/Sulfate Gas Oil Triple Project Planning Task Scheduling Force RWO PDP annulus Hydrophobic General Plan Testing Functional Test Density Mobilize Subcontract Penetration Digital Simulation tubular Processing goods Sponsor Network Path, Racking ("LSD") Start Medium Microorganisms Backward Engineering Reservoir V-door Water Brackish pumping Scheduled ("SSD") Safety Drill Valve Status Schedule Resource Level Chart Gantt Training Formaldehyde Awareness elevators Estimation Control Pre-Tender Estimate Current budget (QA/QC) Quality Assurance Inspection In-Process Concession (subsea) Plateau Impeller retriever Appraisal Activity (processing) Neutralization Source Potential Personal Rewards Ground Packing Element Liner Slotted Conformance Hanger Instrument Production (injector) Tracer Facilities (mud) Pressure Lift-Off Communication Nonverbal Carrier Concurrent Delays slick Valuation Leaders Manpower Industry Risks Management Incident Spending Investigation Limit Reporting test) (well Identification Phase Programme Vapor World Threshold Velocity lift) Particle Benefits Compressor Painting Insulation Float ("FF") Statistics element Temperature Detailed Motivating Policy Manual Emergency Requirements Response Specific ("KPI") Terms Performance Indicators Qualifications Contractor Optimistic Discontinuous Barite Clintoptolite Dispute Fines Migration Pitot Materials Procurement Evaluation Vendor Contract Award Assets Computer Modeling Procedures Configuration Verification Leader Phased clamp safety (facilities) Considerations Organization Development Competency Trade-off Tetrad Off-the-Shelf Items hazard consequence probability project Python Monte-Carlo risks simulation visualize analyze pipeline ferrites black-powder SRBC Baseline Risk tubing Diameter coiled Emulsifier Emulsion Invert Responsibility Casing Electrical Submersible Phasing Finish Known-Unknown Curvature (seismic) Pre-Qualifications Exchange Capacity Cation MIT-IA Depth Vertical Pulse Triplex Brainstorming Log-Inject-Log Managed GERT Nipple Cased Perforated Fault Software Staff System Vibroseis radioactivity Product Review Acceptance Capability Immature Net-Back Lapse Factor Specification Culture Matrix Staffing Effort Cement Micro Letter Fanning Equation factor) friction ECC WIMS Bar-Vent perforating meter displacement FLC Information Flow connection Junk Static service In-House OWC BATNA Curve Bridging depth control perforation Doghouse Scope Description D&A E&A Effect Belt Architecture wet DFIT Magnitude Order LPG Contractual Legal Electric Logging CL Drawing Logic Semi-Time-Scaled IAxOA CMIT Expenditures Actual opening Skirt access (corrosion) Passivation Blanking Performing Uplift Underbalance Communicating Groups SDV Fluid Shoot Qualification Spacing Hydrofluoric Shearing basket Construction Systems Programmer Individual Activation Layout organophosphates Deox Fourier A2/O botanical pesticide EAP colloidal Displacement process GPR Relationship SOC Constraint Prime Gathering Tap CM Subproject Oil-In-Place Percentage time-lag accumulator compounds aliphatic vapor evaporation compression echo فنى # psvs