2018 IIAR Conference and Expo: 10 Things You Should Know

Earlier this spring, Hixson’s Manager of Refrigeration Engineering Jim Adler, P.E., and Refrigeration Project Engineer Brad Cobb, P.E., attended the 2018 IIAR Industrial Refrigeration Conference and Expo in Colorado. Here are the top 10 things Jim and Brad discovered at this annual event:

  1. Use galvanized steel piping for make-up water to an evaporative condenser to minimize the chance for galvanic corrosion if the condenser basin is already galvanized steel. Typically this piping will tie-in to a copper water line somewhere in the engine room, and it is best to place one dielectric fitting at this location, versus having multiple dielectric fittings at each water connection.
  2. Pre-passivate a condenser with water that has the same chemistry as the water at the site that will be used to operate the condenser.
  3. Considering hot gas defrost, note that a properly sized soft gas line is roughly 20-30% of the main solenoid capacity.
  4. A hot gas defrost of a unit cooler is more efficient when using a defrost float drainer although if an ammonia system contains a high quantity of oil, this method does not flush oil out of the unit coil.
  5. If using a motorized valve as the main hot gas valve, the opening time shall be greater than three minutes from full closed to full open.
  6. While ammonia is not as flammable as gasses such as methane, if sparked in a crowded engine room with piping, the flame behaves much closer to a methane flame and therefore has the potential to be more explosive.
  7. IIAR is in the process of issuing an addendum to IIAR-2 to make corrections and include adsorption systems. This will allow ASHRAE-15 to remove their ammonia design requirements and refer to IIAR-2, allowing our clients to only need to reference one code for design.
  8. A technical paper on a packaged C02/NH3 system for a supermarket has proven the viability of the technology and that it can lower operating costs. This could lead to larger systems for industrial users.
  9. The Recognized And Generally Accepted Good Engineering Practices (RAGAGEP), which Jim is helping to write, had its first public review and generated more than 200 comments.
  10. The Process Safety Management/Risk Management Plan (PSM/RMP) program, Ammonia Refrigeration Management (ARM) programs, and low-charge ARM program are very close to being issued for public review.

Attendance at conferences like the 2018 IIAR Industrial Refrigeration Conference and Expo are part of Hixson’s commitment to Continuing Education for our associates, as well as Hixson’s commitment to providing Insight to our clients.

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