MSS 24 MSS SP-58 (Type 24) Standard

 MSS SP-58 is a comprehensive standard for “Pipe Hangers and Supports,” and “Type 24” refers to a specific product type defined within this standard: the U-Bolt.

The following is a detailed summary of the standard and its Type 24 classification in English:

1. Overview of MSS SP-58 Standard

The full title of MSS SP-58 is Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application, and Installation.

• Issuing Organization: Manufacturers Standardization Society of the Valve and Fittings Industry (MSS)
• Scope: This standard establishes minimum industry requirements for materials, design, manufacturing, testing, load ratings, installation, and inspection of pipe hanger and support components.
• Contents: The main body of the standard includes 15 chapters covering materials, allowable stresses, product design, manufacturing, protective coatings, marking, packaging, and installation practices.

2. Specific Content of “Type 24”

Within the MSS SP-58 standard, Type 24 specifically refers to the U-Bolt. This is confirmed by multiple manufacturer catalogs and technical data sheets, where product descriptions often explicitly state compliance with “MSS SP-58 (Type 24).”

Key features and applications of Type 24 (U-Bolt) are as follows:

• Product Definition: A bolt shaped like the letter “U,” typically supplied with nuts, used to secure pipes to structural supports.
• Primary Functions:
  • Support: Used to support pipes in general piping applications.
  • Restraint / Guidance: Used to anchor or guide pipes in a specific position, limiting their movement.
• Typical Configuration: Each U-bolt assembly typically includes 4 nuts (two on each threaded end).
• Applicable Pipe Sizes: Suitable for small-bore and utility piping lines. Common applicable pipe sizes range from 1/2 inch to 8 inches and larger.
• Material and Coating:
  • Material: Typically made of carbon steel, stainless steel, or mild steel.
  • Coating: For corrosion protection, surface finishes usually include electro-galvanizing or hot-dip galvanizing.
• Performance Example:
  • For a 2-inch pipe size U-bolt, the typical load capacity is approximately 1144 lbs (about 520 kg), with a service temperature up to 750°F (about 399°C).
  • Common threaded rod diameters include 3/8 inch, M8, M10, M12, etc.

3. Related Standards and Classification

MSS SP-58 is often used in conjunction with MSS SP-69:

• MSS SP-58: Specifies how to manufacture (materials, design, testing).
• MSS SP-69: Specifies how to select and apply (i.e., in which scenarios Type 24 should be used).

Additionally, the Type 24 U-Bolt also complies with the U.S. Federal Specification WW-H-171 (Type 24).

Summary

In simple terms, MSS SP-58 (Type 24) refers to a U-Bolt pipe support that meets the quality and design requirements of the MSS SP-58 standard, primarily used for load-bearing and restraining piping systems.