ASTM A733 Material classification and scope of application
Carbon steel pipe fittings
Welded carbon steel: This is a material widely used in general piping systems, in accordance with ASTM A53/A53M and ASTM A333/A333M standards. ASTM A333/A333M is mainly used for low-temperature applications (such as liquefied natural gas equipment)
Seamless carbon steel: Mainly suitable for ASTM A53/A53M (general application), A106/A106M (high temperature application) and A333/A333M (low temperature application), because the seamless design allows it to work normally under high temperature and high pressure, and can cope with special scenes and various overload working environments.
Austenitic stainless steel pipe fittings
In accordance with ASTM A312/A312M standards, the fittings are specially designed for high temperature and corrosive environments and are widely used in chemical design, food processing and other industries.
5. Synergy with other standards
https://pandapipe.com/blog/ast....m-a733/#elementor-to

Technical points in the construction (Build) phase‌
The following practices should be implemented in combination with the design and support solutions:


‌Prefabrication and welding‌: To ensure that welds that meet the API 1104 standard are generated and the pass rate of non-destructive testing (UT/RT) is greater than 99%. Fully automated welding robots should be used,
‌Support installation‌: The embedded depth of the anchor point must be ≥ 1.5 times the diameter of the pipeline, and the bolt torque value is calibrated according to GB/T 3098.1.
‌Acceptance test‌: 1.5 times the working pressure for 30 minutes, laser centering detection deviation <2mm/m
https://pandapipe.com/blog/cal....culate-structural-pi

Basis for selecting cast iron pipe size
In practical applications, the following factors need to be considered when selecting the right size of cast iron pipe:
Flow demand: Select the diameter of the pipe according to the flow demand of the system to ensure smooth flow and avoid blockage or overflow.
Pressure level: Different applications have different requirements for the pressure bearing capacity of the pipe, and the appropriate wall thickness needs to be selected according to the actual working conditions.
Installation space: The outer diameter of the pipe needs to match the installation environment to avoid installation difficulties due to space limitations.
Material standards: Cast iron pipes that meet national or international standards should be selected to ensure quality and safety.
Length and connection method: Standard length is convenient for transportation and installation, and the connection method (such as socket, flange connection, etc.) must meet the system design requirements.
https://pandapipe.com/blog/cast-iron-pipe-size/

Detailed data of common specifications
Small diameter cast iron pipes
Small diameter cast iron pipes (DN50~DN30 are usually used for drainage or water supply networks inside buildings. Taking DN100 as an example, its common outer diameter is 110mm and the wall thickness is 6mm. This pipe is easy to install and suitable for short-distance transportation.

Medium diameter cast iron pipes
Cast iron pipes with a size range of DN400~DN800 are classified as medium diameter. This pipe is used in urban water supply trunk pipes. For example, a DN600 ductile iron pipe has an outer diameter of 660mm and a wall thickness of 9mm, 12mm or 14mm depending on the pressure level.

Large diameter cast iron pipes
Large diameter cast iron pipes have a nominal diameter of more than DN1000 and are mainly used for long-distance water transportation in municipal water supply trunk networks. For example, a DN1200 ductile iron pipe has an outer diameter of 1320mm and a wall thickness of 18-20mm. This large-sized pipeline has higher transportation efficiency, but the construction difficulty and cost will also increase significantly.

https://pandapipe.com/