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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Questions?pthomas@resourcecompliance.com