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Codes and Standards

Codes and Standards

Codes and Standards

Any project should have the required design Codes and Standards for materials and equipment. In any project, a client usually sets the requirements, and the engineer should review them to make sure that they are complete and not contradictory.

All Codes are developed to establish uniform minimum Standards for:

  • piping material
  • fabrication and welding procedures
  • quality of work
  • qualification of personnel
  • inspection and testing

These Standards make sure that there is a maximum protection against the accidents occurring in the piping system.

Design Codes

The Codes define the necessary rules and regulations for safe design and construction. For example, the piping codes address the following design requirements:

− Allowable stresses and stress limits

− Allowable dead loads and load limits

− Allowable live loads and load limits

− Materials

− Minimum wall thickness

− Maximum deflection

− Seismic loads

− Thermal expansion

The piping codes do not include components such as fittings, valves, flanges, and meters. They define the design requirements for these components based on the industry standards.

Design Standards

The Standards provide specific design criteria and rules for individual components or classes of components, such as valves, flanges and fittings. Standards apply to both dimensions and performance of system components.

Dimensional standards provide configuration control parameters for components. The primary goal of dimensional standards is to make sure that similar components produced by different suppliers are interchangeable with each other.

Pressure-integrity standards provide minimum-performance criteria. The main goal is to make sure that the component produced to the same standard will function in an equivalent manner.

The main associations involved in generating piping codes and standards for process industry in the US are:

  • ASME: American Society of Mechanical Engineers
  • ANSI: American National Standardization Institute
  • ASTM: American Society of Testing Materials
  • API: American Petroleum Institute (primarily for Oil & Gas Industry)

The basic rules for piping engineering are ASME B31 Codes. The important Codes are:

ASME B31.1 – Power Piping

ASME B31.2 – Fuel Gas Piping

ASME B31.3 – Process Piping

ASME B31.4 – Liquid Piping

ASME B31.5 – Refrigeration Piping

ASME B31.8 – Gas Distribution and Transportation

_ ASME B31.9 – Building Service Piping

ASME B31.11 – Slurry Piping − ASME Boiler and Pressure Vessel Code applies to boiler supplied piping.

− For pipelines there are Department of Transportation requirements that may apply, such as CFR Part 192.

− For modifications to existing plants, OSHA 1910.119 may apply to Management of Change, Mechanical Integrity and Inspection Requirements.

Each Code provides the typical loading conditions, permittable stresses, minimum wall thickness calculations, minimum fabrication, and inspection and testing requirements.


With the above explanations, we have completely realized that the pipes in different dimensions and materials depend on the kind of executive projects. But the significant point is that Marzogh Company has more than one design project and the implementation of mini-petrochemical and petrochemical in Iraq and Iran and an ongoing project in Afghanistan. Marzogh Company does not apply any ordinary material. If you use the ordinary material, you will definitely observe the lack of quality of equipment in the production process. Marzogh Company possesses a specialized board in connection and piping. It is the provider of the main parts of the popular and valid brands in the world at a reasonable price. It gives the opportunity for its customers to choose high-quality products in petrochemical parts and equipment in the production for many years. Stay tuned.


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