Pipes Codes Standards

Overview

Engineering reference data for Pipes Codes Standards in fluid mechanics.

Key Formulas

Reynolds Number

$Re = \frac{\rho v D}{\mu}$

Ratio of inertial to viscous forces — determines flow regime.

Bernoulli's Equation

$P + \frac{1}{2}\rho v^2 + \rho g h = \text{const}$

Conservation of energy for steady, inviscid, incompressible flow.

Continuity Equation

$A_1 v_1 = A_2 v_2$

Conservation of mass for incompressible flow.

Darcy-Weisbach

$\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}$

Pressure drop due to friction in a pipe.

Variables

Symbol	Description	Unit
$Re$	Reynolds number	—
$\rho$	Fluid density	kg/m³
$v$	Flow velocity	m/s
$D$	Characteristic dimension	m
$\mu$	Dynamic viscosity	Pa·s
$P$	Pressure	Pa
$f$	Darcy friction factor	—

Piping Standards Organizations

The following organizations develop and maintain key piping codes and standards:

• ANSI (American National Standards Institute): A private, not-for-profit organization that coordinates and approves American national standards.
• ASME (American Society of Mechanical Engineers): Develops codes and standards for mechanical engineering, including the International Boiler and Pressure Vessel Code and pressure piping codes like ASME B31.
• ASTM International (American Society for Testing and Materials): Publishes voluntary standards for materials, products, systems, and services, with extensive coverage for steel pipes and fittings.
• BSi (British Standards Institution): Provides British standards and specifications for pipes, tubes, and fittings.
• DIN (Deutsches Institut für Normung): German institute for standardization, offering standards for pipes and fittings.
• ISO (International Organization for Standardization): Develops international standards, including those for pipes and fittings.
• JIS (Japanese Industrial Standards): Japanese standards for flanges, bolts, nuts, and pipes, managed by the Japanese Standards Association.
• API (American Petroleum Institute): Sets standards for the oil and natural gas industry, including piping systems and flanges.
• AWWA (American Water Works Association): Provides standards for water supply and distribution systems.
• NACE International: Focuses on corrosion engineering and science, with standards related to piping materials and protection.

Notable Piping Codes and Specifications

• *ASME B31: A comprehensive code for pressure piping, covering various applications from power plants to building services.
• *ASME B31.9: Specifies working pressure and temperature limits for building services piping.
• *ASTM D2846: Covers dimensions for CPVC plastic hot and cold water distribution tubes.
• *ANSI Schedule 40 and 80: Define dimensions, weights, and specifications for steel pipes.
• *EN 10255: European standard for non-alloy steel tubes suitable for welding and threading.
• Flanges standards: Often compared between API and ASME/ANSI for different pressure ratings and dimensions.

References

• Original Source