Produced by the , this handbook serves as both a tutorial and a comprehensive reference book. It represents the collective knowledge of top specialists in the ammonia refrigeration industry.

: Reducing pressure drops to lower overall energy consumption.

ASME B31.5 is the specific piping code for refrigeration systems. Regulatory bodies often require that "all refrigeration system piping shall conform to the Refrigeration Piping Code (ANSI B31.5) as it applies to anhydrous ammonia." This code covers the engineering requirements for the materials, fabrication, assembly, and testing of the pipes themselves.

Modern piping designs include removable insulation covers at high-risk weld joints to allow for non-destructive testing (NDT). 5. Safety, Valves, and Overpressure Protection

Are you designing a or upgrading an existing facility ?

For those who own the 2025 edition, it is essential to check for any published errata. IIAR maintains a specific section on its website, where corrections (such as the March 9, 2026 errata for Chapter 1) are officially documented.

It is important to understand how the Piping Handbook relates to official IIAR standards:

A: No legally sanctioned free link exists. IIAR does not offer the full standard for free due to copyright. However, you can find free fact sheets and safety bulletins on the IIAR website under the "Resources" tab.

A: The official PDF contains example calculations (e.g., expansion loop sizing on page 4-12 of the 3rd edition), but not interactive Excel files. Some older bootleg copies claim to have "bonus spreadsheets" – treat those as malware.

Ammonia is highly corrosive to copper, brass, and zinc. The handbook specifies approved materials for safely handling the refrigerant:

If you are looking for the specific features of this handbook to justify its use or purchase, here is a breakdown of what the document provides:

The handbook aligns with recognized engineering standards and is often used by code officials and safety inspectors to verify that a system has been designed and installed correctly. Summary of Key Chapters

Authorized government officials, such as inspectors and emergency responders, may access these standards and technical resources for free through the IIAR Government Services Portal .

Check your university library database, as many technical schools hold institutional subscriptions to engineering standards. If you are currently designing a system, let me know:

Control valves, stop valves, check valves, and regulators must be specifically rated for anhydrous ammonia. The handbook details proper valve orientation, placement for maintenance accessibility, and insulation strategies to prevent corrosion under insulation (CUI). 4. Structural Supports and Thermal Expansion

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