Piping Class Ratings based on the ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard - class and the corresponding ISO 7005 PN (Pression Nominal*) ratings:
|Flange Pressure Nominal (PN)||20||50||68||110||150||260||420|
* "Pression Nominal" is the French equivalent of Pressure Nominal
"Pression Nominal" is the rating designator followed by a designation number indicating the approximate pressure rating in bars.
- 1 bar = 1x105 Pa (N/m2) = 0.1 N/mm2 = 10,197 kp/m2 = 10.20 m H2O = 0.98692 atm = 14.5038 psi (lbf/in2)
PN ratings do not provide a proportional relationship between different PN numbers, whereas class numbers do. Class numbers are therefore recommended before PN ratings.
Note! The piping rating must follow the pressure-temperature rating of the weakest pressure containing item in the system.
Piping codes and standards - ASME, ANSI, ASTM, AGA, API, AWWA, BS, ISO, DIN and more..
Pressure ratings of pipes and tubes and their fittings - carbon steel , stainless steel, plastic, copper and more.
Allowable pressure for aluminum tubes.
ANSI provides a forum for development of American national standards.
ASME is one of the leading organizations in the world developing codes and standards.
A survey of one of the most important pressure pipe codes - ASME B31, earlier known as ANSI B31.
Flanged fittings and required hydrostatic test pressure.
Tensile stress and Hooke's Law.
Flange diameters, thickness, bolt circles, numbers and diameters of bolts for ASME/ANSI B16.15 - Cast Bronze Threaded Fittings - 150 lb Bronze flanges with plain faces.
Flange diameters, thickness, bolt circles, numbers and diameter of bolts for ASME/ANSI B16.15 - Cast Bronze Threaded Fittings - 300 lb Bronze - Flanges with plain faces.
ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 150 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.
ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 900 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.
Maximum ratings for flanges conforming to ISO Standard 2229 dimensions and material specification AST-A-105.
Pressure (psig) and temperature (deg F) ratings for A-53 B and A-106 B, A333, A334 and API 5L carbon steel pipes - temperatures ranging 100 degF - 700 degF.
Pressure (kPa)> and temperature (degC) ratings of ASTM A-106, API 5L and ASTM A-53 Seamless Carbon Steel Pipes - temperatures ranging -29 degC - 450 degC.
Maximum working pressures for cast iron threaded pipe fittings according ANSI B16.4.
Number of studs, diameter and length for ANSI forged steel flanges ranging class 150 to 1500.
ASME/ANSI B16.3 Malleable Iron Threaded Fittings - Pressure and Temperature Ratings.
The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - 'Diametre Nominal'.
Gasket dimensions according ASME B16.5 Pipe Flanges and Flange Fittings.
Introduction to the schedule terminology of pipes.