Insulation Systems: Best practices for vapor barriers to prevent "corrosion under insulation" (CUI).
Ammonia systems operate under high pressure, especially in hot-gas defrost cycles. The handbook provides:
| Service | Minimum Velocity (fps) | Maximum Velocity (fps) | Reason | | :--- | :--- | :--- | :--- | | Suction Lines | 10 (horizontal) | 4,000 (vertical) | Oil return in horizontal runs | | Discharge Lines | N/A | 5,000 | Noise & pressure drop | | Liquid Lines (non-pumped) | 1.5 | 3.0 | Preventing flash gas | | Pumped Liquid Lines | 3.0 | 7.0 | Maintaining NPSH |
IIAR standards are often used as "Recognized and Generally Accepted Good Engineering Practices" to comply with EPA and OSHA regulations. 🔗 Official Access and Downloads
Handbook Pdf Link — Iiar Ammonia Refrigeration Piping
Insulation Systems: Best practices for vapor barriers to prevent "corrosion under insulation" (CUI).
Ammonia systems operate under high pressure, especially in hot-gas defrost cycles. The handbook provides: iiar ammonia refrigeration piping handbook pdf link
| Service | Minimum Velocity (fps) | Maximum Velocity (fps) | Reason | | :--- | :--- | :--- | :--- | | Suction Lines | 10 (horizontal) | 4,000 (vertical) | Oil return in horizontal runs | | Discharge Lines | N/A | 5,000 | Noise & pressure drop | | Liquid Lines (non-pumped) | 1.5 | 3.0 | Preventing flash gas | | Pumped Liquid Lines | 3.0 | 7.0 | Maintaining NPSH | Insulation Systems: Best practices for vapor barriers to
IIAR standards are often used as "Recognized and Generally Accepted Good Engineering Practices" to comply with EPA and OSHA regulations. 🔗 Official Access and Downloads 🔗 Official Access and Downloads