At our recent 2020 Ammonia Refrigeration Training Days, President and Senior Engineer Peter Thomas gave the keynote address. Peter, a member of the writing subcommittee, gave an overview of the new mechanical integrity standard: ANSI/IIAR 6-2019 Standard for Inspection, Testing, and Maintenance of Closed-Circuit Ammonia Refrigeration Systems. Watch the video:
Is it acceptable to test a high discharge pressure cutout (HPCO) by lowering the setpoint? Maybe. ANSI/IIAR 6-2019 §6.1.1 prescribes the allowable methods for testing a compressor HPCO which is required annually per Table 6.1. Depending on the type of pressure limiting device being used, allowable methods differ. Electromechanical Switch Electromechanical switches are widely used […]
Chapters 6-15 of ANSI/IIAR 6-2019 primarily consist of tables which summarize the minimum frequencies for the required ITM tasks. Each chapter addresses a different category of equipment: 6 – Compressors 7 – Refrigerant Pumps 8 – Condensers 9 – Evaporators 10 – Pressure Vessels 11 – Piping 12 – Safety Systems 13 – Overpressure Protection […]
Who is allowed to perform inspections on an ammonia refrigeration system? ANSI/IIAR 6-2019 §5.4.2 succinctly states that “Equipment inspections shall be performed by a qualified inspector(s)“. According to the definition in Chapter 2, a Qualified Inspector is “A person who is experienced with closed-circuit ammonia refrigeration systems, has knowledge of the process, and has demonstrated […]
ANSI/IIAR 6-2019 §5.3 summarizes minimum requirements for ITM Program record keeping. Most of the items listed parallel an existing Process Safety Information (PSI) requirement in the PSM regulations (Title 8 CCR §5189(d) and Title 29 CFR §1910.119(d)). The table below compares the requirements of IIAR 6 to PSM: Operational log (used to transfer information between […]
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