Does this page look up ASME B16.5 or EN 1092-1 ratings?

No. Enter a rating already obtained for the exact temperature,material and flange designation from the controlling licensed document. The page performs only unit conversion,ratio and margin arithmetic.

Does “within entered limit” prove the flange is compliant or safe?

No. It only compares two entered gauge pressures. Applicability,materials,edition,temperature limits,flange type,size,other loads,joint components and governing law still require engineering verification.

Licensed rating value required — no table lookup

Documented Flange Rating Arithmetic Check

Compare operating gauge pressure with a documented maximum working gauge pressure obtained for the same temperature and exact flange/material basis.

No interpolationNo extrapolationbar(g) · MPa(g) · psi(g)

Арифметическое сравнение

Condition relative to entered documented value

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Utilization, P_op/P_doc

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Pressure margin, P_doc−P_op

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Operating pressure conversions

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Documented pressure conversions

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Temperature conversions

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Arithmetic only

utilization = P_op/P_doc ×100%
margin = P_doc−P_op

“Within entered limit” means only that the operating gauge pressure number does not exceed the documented gauge-pressure number supplied by the user. It is not a standards conformity,safety or fitness-for-service decision. Another component,load case,temperature excursion,material limitation or legal requirement can govern.

Unit conversions

The calculation converts through pascals using1bar=100000Pa,1MPa=1000000Pa and1psi=6894.757293168Pa. Temperature uses T_°С=(T_°F−32)·5/9 and T_K=T_°С+273.15. Gauge and absolute pressure must not be mixed.

Standards context — licensed tables not implemented

ASME B16.5—2025 is the current official edition and covers pressure-temperature ratings,materials,dimensions,tolerances,marking and testing for its specified NPS/class scope. Its official scope includes Classes150,300,400,600,900,1500 and2500 with size restrictions;the former page omitted Class400 and its numerical rows were not verified against the licensed2025 tables.

EN1092-1:2018 is the current steel-flange edition identified by BSI/DIN and uses PN-designated flanges,with its own materials and p/T rules. It superseded the2007+A1:2013 edition. An EN selection must never reuse ASME Class/material-group rows.

Not checked: edition/table applicability,material specification/group,product form,NPS/DN,size restriction,class/PN,flange/fitting type,temperature boundary,interpolation permission,corrosion,external loads,cyclic service,bolting,gasket,joint integrity,other piping/equipment ratings or jurisdiction.

Conversion reference:NIST SP811 conversion factors. Standards status/scope checked12July2026. No closed rating row,clause or interpolation rule is asserted.