Calculator Library
Professional-grade piping calculators built for speed, accuracy, and compliance with ASME and international standards.
Blind Plate Thickness
Minimum inserted blind plate thickness per ASME B31.3 / B16.48 using the flat-plate formula.
Flange Bolt Torque
Preliminary flange stud-bolt tightening torque (Bolt Yield + ASME VIII-1 App 2 Gasket Seating) for ASME B16.5 and B16.47 Series A/B flanges, with tightening sequence and tool/method guideline.
Branch Reinforcement
ASME B31.3 area replacement check for welded branch connections with optional reinforcement pad and weld-area credit.
Control Valve Sizing Calculator
Preliminary Cv / Kv control valve sizing per ISA-75.01.01 / IEC 60534-2-1 — liquid & gas service with choked flow, flashing and cavitation checks, opening estimate and valve size recommendation.
Restriction Orifice Sizing
Single-stage restriction orifice sizing and rating for liquid, gas/vapor and steam (ISO 5167 + Crane TP-410) — bore diameter for a target pressure drop, or the flow through an existing plate.
Line Hydraulics — Multi-Segment
Single-phase pressure drop across a chain of pipe segments in series (liquid + vapor isothermal). Darcy-Weisbach + Colebrook, Crane fitting K, elevation, thin-orifice loss, and API RP 14E erosional-velocity checks, threading inlet-to-outlet pressure down the line.
Pressure Surge Analysis
Preliminary pressure-surge water hammer screening using Joukowsky, Korteweg wave speed, and slow-closure reduction with over-pressure and cavitation checks.
Pressure Drop
Darcy-Weisbach pressure drop with Haaland friction factor, fittings (K-factor), and equipment (fixed kPa)
Strainer Pressure Drop
Clean and fouled pressure drop across Y-type, basket, tee and conical strainers — open-area ratio from screen geometry, Idelchik element resistance, body K and Cv.
Remaining Life / Fitness-for-Service
API 579-1/ASME FFS-1 metal-loss fitness-for-service — MAWP, remaining life and inspection interval from thickness data, plus a local-metal-loss RSF assessment.
Line Sizing
Optimum pipe size (NPS) from service velocity & pressure-drop criteria, with an API RP 14E erosional-velocity check.
External Pressure / Vacuum Collapse
Cylindrical-shell collapse under external pressure or full vacuum — ASME VIII-1 UG-28 screening via Windenburg–Trilling and long-tube elastic collapse with a design factor of 3.
Minor Loss K Calculator
Fittings & valves resistance coefficient (K) and pressure drop — compared across Crane TP-410, Hooper 2-K and Darby 3-K methods.
Pipe-spacing
Industrial-grade pipe-spacing analysis per international safety codes.
Pipe Weight & Support Load
Pipe weight per metre (empty/operating/hydrotest), support load over a span, and a recommended MSS SP-58 hanger-rod size.
Pipe-span
Maximum support spacing for a horizontal pipe — governed by bending stress, mid-span deflection, and support bearing (MSS SP-69 simple beam).
Pipe Thrust / Reaction Force
Resultant thrust at a pipe bend from pressure and momentum forces (R = 2·(P·A + ρ·A·v²)·sin(θ/2)) for anchor, thrust-block and support-restraint design.
Pipe Stress Screening & Flexibility
Preliminary ASME B31.3 stress screening (Category A/B/C) plus approximate sustained + guided-cantilever flexibility check.
Pipe-thickness
Industrial-grade pipe-thickness analysis per international safety codes.
Elbow / Bend Wall Thickness
Minimum wall thickness of a pipe bend per ASME B31.3 para 304.2.1 (t = P·D / [2·(S·E·W/I + P·Y)]), with intrados/extrados/crown correction factors from the bend radius ratio R1/D.
Gas / Compressible Flow
Compressible gas pressure drop (isothermal Crane TP-410 + Weymouth/Panhandle) with exit Mach number, API RP 14E erosional check and choked-flow guard.
Two-Phase Flow Pressure Drop
Two-phase (gas + liquid) pressure drop by the Lockhart–Martinelli / Chisholm separated-flow model — friction and elevation gradient, two-phase multiplier, no-slip holdup and an indicative flow regime.
Fire-Case Relief Load
Wetted-area fire relief load per API 521 (Q = C·F·Aws^0.82, W = Q/λ) — absorbed heat and vapour relief rate to feed PRV / relief-valve orifice sizing.
PSV Reaction Force
Open-discharge PSV tailpipe reaction force per API 520 Part II (F = (W/366)·√(k·T/((k+1)·M)) + A·P) with a Dynamic Load Factor for the pop-action transient — for relief-valve support design.
PRV Orifice Sizing
API 520 Part I relief-valve orifice sizing for gas/vapor, steam and liquid service, matched to the API 526 lettered orifice series (D–T).
Thermal Expansion
Pipe thermal growth (ΔL) from mean linear expansion plus a guided-cantilever expansion-loop leg length (ASME B31.3 Appendix C / flexibility). Screening basis with an Appendix C override.
Expansion Loop Sizing
Guided-cantilever expansion-loop leg sizing per ASME B31.3 para 319 (L = √(3·E·D·Δ / S_A)) to absorb thermal growth within the allowable displacement stress range.
AIV / FIV Vibration Screening
Energy Institute AVIFF likelihood-of-failure screening — FIV from kinetic energy ρ·v² and AIV from the source sound power level (Carucci–Mueller) with pipe D/t, giving a traffic-light verdict and mitigations.
Hydrotest Pressure
ASME B31.3 hydrostatic and pneumatic test pressure with S_T/S temperature correction and an optional test hoop-stress check against SMYS.
Insulation Heat Loss
Heat loss and jacket surface temperature for an insulated pipe (ASTM C680) — conduction plus a convection/radiation surface film, with a personnel touch-safe check and bare-pipe saving.
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