Piping Engineering
Piping Calculators
Tools for pipe sizing, pressure drop, valve sizing, hydrotest pressure, pipe wall thickness, and other piping engineering calculations.
30 calculators shown
Minimum thickness of a line blank, spectacle blind, or paddle blind for internal pressure per ASME B31.3 para 304.5.3.
Area-replacement check for a branch connection per ASME B31.3 para 304.3.3, with and without a reinforcing pad.
Isothermal compressible flow through a pipe with a Mach number check, plus the Weymouth and Panhandle transmission equations for long gas lines.
Size an expansion loop by the guided-cantilever method, from thermal growth and the ASME B31.3 allowable displacement stress range S_A.
Critical collapse pressure and allowable external pressure for a pipe or cylinder under vacuum or jacket pressure, per ASME BPVC VIII-1 thinking.
Fire-case heat input and relief vapour load for a wetted vessel per API 521 para 4.4.13.2.4, with the drainage and firefighting credit.
Bolt torque for a flanged joint from the required gasket seating and operating loads per ASME VIII-1 Appendix 2, with a staged tightening sequence.
Segment-by-segment hydraulic build-up for a pipe run — friction, fittings, equipment, static head, and a safety factor — with Colebrook friction and Crane K-values.
Hydrostatic and pneumatic test pressure per ASME B31.3 para 345, with test hoop-stress and yield checks, gauge range, hold time, and brittle-fracture temperature.
Heat loss per metre and surface temperature for insulated pipe by the ASTM C680 screening method, including convection, radiation, and solar gain.
Resistance coefficient K for fittings and valves by the Crane TP-410, Hooper 2-K, and Darby 3-K methods, with the Reynolds and size dependence the simple method misses.
Minimum wall thickness at the intrados and extrados of a pipe bend per ASME B31.3 para 304.2.1, using the bend radius correction factor I.
Select a line size by screening candidate NPS against service-specific velocity and pressure-drop criteria, with an API RP 14E erosional velocity check.
Center-to-center spacing between two parallel lines on a pipe rack, looked up from bare and insulated line-spacing tables for NPS 1"–24".
Screen a line against the ASME B31.3 three-category diagram, then run the guided-cantilever sustained and expansion stress check with utilisation against Sh and Sa.
Maximum pipe support span from bending stress, mid-span deflection, and local support stress, per MSS SP-69 practice — the smallest of the three governs.
Thermal growth of a pipe run from the coefficient of expansion or the ASME B31.3 Appendix C tables, with the flexibility leg needed to absorb it.
Resultant thrust at a bend from pressure and momentum, for anchor block and restraint design, per the Crane TP-410 momentum method.
Minimum required pipe wall thickness for internal pressure per ASME B31.3 para 304.1.2, including corrosion allowance and mill tolerance.
Weight per metre of pipe, contents, insulation, and cladding, the resulting support load, and the hanger rod size to carry it per MSS SP-58.
Flow-induced and acoustic-induced vibration screening per the Energy Institute AVIFF guidelines, using the ρv² kinetic energy and the acoustic power level.
Frictional pressure loss along a pipe by Darcy–Weisbach, with fitting K-values, equipment losses, and static elevation head.
Required relief valve orifice area for liquid, gas, or steam service per API 520, with selection of the standard API 526 orifice letter.
Reaction force on an open relief valve discharge per API 520 Part II para 4.4, with a dynamic load factor for the support design.
Corrosion rate and remaining life from thickness readings per API 579-1/ASME FFS-1, with long-term and short-term rates and a MAWP-limited life.
Bore size or flow rate for a restriction orifice in liquid, gas, or steam service per ISO 5167 and Crane TP-410, with a choked-flow check.
Pressure drop across a basket or Y-strainer from the open area ratio and screen geometry, using the Idelchik perforated-plate and mesh resistance forms.
Water hammer surge pressure by the Joukowsky and Michaud–Allievi relations, with the Korteweg wave speed for the pipe and fluid.
Two-phase pressure drop by the Lockhart–Martinelli separated-flow model with the Chisholm C parameter, from the single-phase gradients of each phase.
Required valve flow coefficient per ISA-75.01.01 / IEC 60534-2-1 for liquid, gas, and steam service, with choked-flow, cavitation, and piping-geometry corrections.