20180926 Mechanical Integrity of Ammonia Systems · 9/26/2018 · Mechanical Integrity of Ammonia...
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Stanislaus County Workshop 9/26/2018 1 Mechanical Integrity of Ammonia Systems Peter Thomas, P.E. – Resource Compliance Written Procedures Inspection and Testing Equipment Deficiencies Quality Assurance Mechanical Integrity
Transcript of 20180926 Mechanical Integrity of Ammonia Systems · 9/26/2018 · Mechanical Integrity of Ammonia...
Stanislaus County Workshop 9/26/2018
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Mechanical Integrity of Ammonia SystemsPeter Thomas, P.E. – Resource Compliance
Written Procedures Inspection and Testing
Equipment Deficiencies Quality Assurance
Mechanical Integrity
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Equipment Life Cycle
Corrosion
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IRC MI Guidebook
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Nominal Thickness of a 3” Sch 80 Pipe
is 0.300
60% Material Loss
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Condensers
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Compatibility
Pipe Supports
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Relief Valves
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𝐿0.2146𝑑 𝑃 𝑃
𝑓𝐶
𝑑 𝑙𝑛 𝑃 /𝑃6𝑓
Comparing RAGAGEPs
• Refrigeration RAGAGEP: ANSI/IIAR 2-2014 Standard for Safe Design of Closed-Circuit Ammonia Refrigeration Systems
• Fertilizer Storage RAGAGEP: CGA G-2.1 – 2014Requirements for the Storage and Handling of Anhydrous Ammonia
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IIAR 2-2014
• ANSI/IIAR 2-2014 §15.3.7.2.1 Overpressure Due to External Fire• The required discharge capacity of a pressure relief device for each
pressure vessel shall be determined by the following equation:
• C = ƒ ꞏ DꞏL (lb/min)• Where• C = required discharge capacity of the relief device, lb air/min
• ƒ = capacity factor of the relief device, which is 0.5 for ammonia
• D = outside diameter of vessel, ft
• L = length of vessel, ft
CGA G-2.1 - 2014
• CGA G-2.1 – 2014 Appendix A
• Flow rate ft3/min air = 22.11 x A0.82
• Where:
• A = outside surface area of the container in square feet
• Cylindrical container with hemispherical heads
• Area = overall length (ft) x OD (ft) x 3.1416
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Example
• Vessel Dimensions: 8’-0” Diameter x 40’-0” Long
IIAR 2 Analysis
• C = f x D x L
• C = 0.5 x 8 x 40 = 160 lb/min
• 160 lb/min ÷ 0.0764 lb/ft3 = 2,094.24 cfmair
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CGA G-2.1 Analysis
• Area = overall length (ft) x OD (ft) x 3.1416o A = 40ft x 8ft x 3.1416 = 1,005.312ft2
• Flow rate ft3/min air = 22.11 x A0.82
o C = 22.11 x 1,005.3120.82 = 6,404.36 cfmair
Comparison
• Same vessel, same chemical:
• IIAR 2: 2,094.24 cfmair
• CGA G-2.1: 6,404.36 cfmair
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Ventilation
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Air-Cooling Evaporators
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Detection
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Housekeeping
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Physical Protection
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