Piping Toolset
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Piping Calculators — Method, Limitations, Worked Example

Piping Toolset is deliberately narrow: fast, auditable code calculations with engineering-grade reports — not a replacement for CAESAR II, AutoPIPE, Plant 3D, or hydraulic network solvers. Every calculator is a pure function locked by hand-derived fixture cases that must run green before any release ships.

Each calculator page documents the governing equation with code paragraph citations, states its limitations explicitly, walks a fixture-verified worked example you can check by hand, and offers a downloadable sample report — then launches the calculator directly. All calculators below run free in your browser.

Process Piping — ASME B31.3

Process — B31.3ASME B31.3 Pipe Wall Thickness CalculatorPressure design thickness t, minimum required tm, and ordering thickness per B31.3 ¶304.1.2 Eq. (3a). Process — B31.3ASME B31.3 Allowable Working Pressure CalculatorMaximum internal pressure a given pipe wall supports — Eq. (3a) solved for P, net of tolerances and allowances. Process — B31.3Hydrostatic / Pneumatic Leak Test Pressure Calculator (ASME B31.3)Hydro test at 1.5·P·(ST/S) per ¶345.4.2 Eq. (24) and pneumatic test at 1.1·P per ¶345.5.4. Process — B31.3Welded Branch Connection Reinforcement Calculator (ASME B31.3 ¶304.3.3)Area-replacement check for unreinforced and pad-reinforced fabricated branches, with PASS/FAIL and excess area. Process — B31.3Mitered Elbow Allowable Pressure Calculator (ASME B31.3 ¶304.2.3)Multi-miter Eq. (4a)/(4b) and single-miter (θ > 22.5°) allowable pressure with the governing equation identified. Process — B31.3Displacement Stress Range Check (ASME B31.3 ¶319.4.4)SE = √(Sb² + 4St²) against the ¶302.3.5(d) allowable SA = f(1.25Sc + 0.25Sh), with PASS/FAIL. Process — B31.3Pipe Bend Minimum Wall Thickness Calculator (B31.3 ¶304.2.1)After-bend minimum thickness at intrados, extrados, and centerline via the I-factor correction.

Power Piping — ASME B31.1

Power — B31.1ASME B31.1 Power Piping Wall Thickness CalculatorMinimum wall tm for power piping per ¶104.1.2 (SE + Py form), with allowance A and ordering thickness.

BPE / Hygienic Tubing

BPE / HygienicDead-Leg L/d Ratio Calculator (ASME BPE)L/d ratio of a branch dead leg against the SD-3.1.2.2 target of 2, with PASS/FAIL and margin. BPE / HygienicHygienic Line Slope / GSD Drainability Calculator (ASME BPE)Converts any slope input to in/ft, mm/m, % and degrees, and classifies it against the BPE GSD designations. BPE / HygienicCIP Spray Device Flow Sizing Calculator (ASME BPE)Vessel spray-ball flow from wetted-perimeter coverage rates — vertical and horizontal vessels, device-type bands. BPE / HygienicCIP Flow & Velocity Calculator (5 ft/s Rule, ASME BPE)Required CIP flow for a target line velocity — or achieved velocity from available flow — with PASS/FAIL. BPE / HygienicPREN Calculator (Pitting Resistance Equivalent, ASME BPE)PREN from mill-certificate composition, with the App F-3 classification band for stainless, duplex and nickel alloys. BPE / HygienicFerrite / Weldability Calculator (WRC-1992, ASME BPE)WRC-1992 Cr and Ni equivalents, the BN2 low-ferrite discriminant, and the autogenous-weld sulfur window. BPE / HygienicRa Surface-Finish Calculator (ASME BPE SF Designations)Converts measured Ra and the grade ceiling into one unit and reports the ratio, with PASS/FAIL. BPE / HygienicElectropolish Removal & Passivation Acceptance CalculatorEP metal removal from coupon mass loss, plus Cr/Fe and oxide-depth passivation acceptance in one verdict. BPE / HygienicTube Weld Acceptance Calculator (ASME BPE MJ-8.4-1)Concavity, convexity and misalignment against their MJ-8.4-1 limits, with the governing ratio. BPE / HygienicASME BPE Fitting Dimensions Lookup (Part DT-4.1)DT-4.1 take-out dimensions for weld and clamp elbows, tees, crosses, instrument tees, reducers, ferrules and end caps, 1/2 to 6 in.

Thermal Flexibility & Pipelines

Thermal FlexibilityStress Intensification & Flexibility Factor Calculator (B31.3 Appendix D)Closed-form h, k, ii, io for elbows and welding tees — the inputs to every displacement-stress check. Non-Metallic / PolymerPolymer Thermal Expansion Calculator (ASME BPE PM-4.2.3)Thermal growth of a thermoplastic run in inches and millimetres, with the PM-4.2.3 unknown-install-temperature margin. Thermal FlexibilityExpansion Loop / Leg Sizing Calculator (Guided Cantilever)U-loop, Z-offset and L-bend leg lengths from thermal growth — metallic and plastic pipe, classic Kellogg form. Thermal FlexibilityPipe Thermal Growth Calculator (in / 100 ft)Free thermal expansion between anchors from the tabulated in/100 ft coefficient — the field method. Pipelines — B31.4/.8/.11ASME B31.4 / B31.8 / B31.11 Pipeline Wall Thickness CalculatorPressure design thickness t, nominal required tn after allowance, and hoop utilization for liquid, gas and slurry pipelines. Pipelines — B31.4/.8/.11Pipeline MAOP Calculator — Maximum Allowable Operating Pressure (ASME B31.8 / B31.4)MAOP as the lowest of pipe design pressure, test-qualified pressure, and any component or historical cap — with the governing basis named. Pipelines — B31.4/.8/.11Slurry Critical Deposition Velocity Calculator (Durand–Condolios)Critical deposition velocity VD from the Durand form, the actual velocity from flow and bore, and the operating margin between them. Pipelines — B31.4/.8/.11API RP 14E Erosional Velocity Calculator (Line Sizing)Erosional velocity limit Ve = C/√ρ, the actual line velocity from flow and bore, and the ratio between them. Pipelines — B31.4/.8/.11Pipeline Hydrostatic Test Pressure Calculator (ASME B31.4 / B31.8)Test pressure from the code factor, the Barlow hoop stress it develops, and the ratio against the %SMYS cap. Thermal FlexibilityThermal Expansion Table Interpolation Calculator (in/100 ft)Interpolates unit thermal expansion between two code table rows and scales it to total growth over a run length.

Occasional Loads — Wind & Seismic

Occasional — Wind & SeismicASCE 7 Wind Load on Piping CalculatorVelocity pressure qz, design pressure on the projected area, and distributed wind load in lb/ft per ASCE 7 §26.10.2 and §29.4.1. Occasional — Wind & SeismicASME B31E Seismic Design Force Calculator (Fp)Component seismic design force Fp, its 0.3–1.6·SDS·Ip·Wp bounds, and the lateral g coefficient for static analysis. Occasional LoadsWater Hammer Calculator — Joukowsky Surge Pressure and Wave SpeedElastic-pipe wave speed a, the Joukowsky surge rise ΔP = ρ·a·ΔV/(144·g), and the 2L/a critical closure period. Occasional LoadsSnow and Ice Load on Piping Calculator (ASCE 7 Inputs)Ice line load from a uniform radial annulus, snow load on the projected width, and the total added weight in lb/ft.

Pipe Supports

Pipe SupportsPipe Support Spacing Calculator — Maximum Deflection-Limited SpanSection moment of inertia I and the maximum deflection-limited span L from beam theory — the sag criterion itself, not a tabulated span. Pipe SupportsVariable Spring Hanger Load Variability CalculatorCold load, load change and variability % for a variable spring hanger, checked against your own limit.

Equipment & Bolted Flange

Equipment — Nozzle LoadsEquipment Nozzle Load Check Calculator (API 610 / NEMA SM-23)Per-component unity ratios, the governing component, and resultants FR and MR for piping loads at an equipment nozzle. Bolted FlangeFlange Equivalent Pressure Calculator (Kellogg Method)Converts external moment and axial force on a flanged joint into an equivalent pressure Pe and a utilization against the flange rating. Bolted FlangeEN 1591-1 Bolted Flange Load-Balance Screening CalculatorForce-balance screen for a bolted flange per EN 1591-1: gasket area, assembly/operating bolt-load requirement, available bolt load, gasket crush check.

General Engineering Tools

GeneralASME B16.5 Flange Rating Calculator (Pressure–Temperature)Working-pressure rating for a flange's material group and class at design temperature, per ASME B16.5-2017 — with interpolation. GeneralPipe Trapeze / Strongback Hanger Calculator (Channel Size, Rod Size, Max Spacing)Back-to-back channel trapeze sizing: AISC 360 channel selection, threaded-rod sizing on root area, and max strongback spacing with the governor named. GeneralFlange Bolt Tightening Sequence Calculator (Star Pattern Chart + Pass Torques)Star-pattern bolt-up sequence for any flange (4–68 bolts): the numbered chart, the written order, and multi-pass torque percentages with the final circular pass. GeneralPiping Criticality Evaluation Calculator (API 580/581 Screening Rubric)Consequence + likelihood + utilization screening rubric that scores a line CLASS 1 HIGH through CLASS 4 MINOR, with every point shown. GeneralAnalysis Sets: Multi-Code Piping Stress Comparison CalculatorOne load case run through B31.1/B31.3/B31.4/B31.8 side by side — sustained, expansion, hoop and combined unity in a single table. GeneralAISC 360 Steel Member Check Calculator (ASD) for Pipe-Support SteelAISC 360 ASD interaction check for pipe-support steel — Fe/Fcr, Pn/Mn capacities and the governing H1 ratio from section properties you supply. GeneralEJMA Bellows Expansion Joint Rating CalculatorPressure thrust, spring loads on anchors, and column-squirm (instability) screening pressure for a metallic bellows expansion joint, per EJMA. GeneralWelding Tee Stress Intensification Factor Calculator (B31.3 App. D / B31J)In-plane and out-of-plane SIFs (ii, io) and flexibility factor k for a B16.9 welding tee, from the App D closed form.

Fatigue & Remaining Strength

FatigueB31G Corroded Pipe Remaining Strength Calculator (Level 1)Safe pressure of a corroded pipeline from defect depth and length — original B31G parabolic form with Folias factor. FatigueCharpy Arrest Energy Calculator (Battelle CVN Requirement)Required full-size Charpy energy to arrest a running ductile fracture, and the ratio against the mill-certified CVN. FatiguePipeline Dent Depth Screening Calculator (Plain Dents, %OD)Dent depth as a percentage of outside diameter, against the plain-dent acceptance limit your code and dent type allow. FatigueDNV-RP-F101 Corroded Pipe Calculator (Single Defect Capacity)Length correction factor Q, burst capacity pressure, safe working pressure and utilization for a single metal-loss defect.

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