Safety, quality control during construction and insulation are three critical areas to consider when designing an ammonia refrigeration system.
According to American Heritage Dictionary of the English Language, Fourth Edition, world-class is defined as follows:
world-class (wûrld´klas´) adj. 1. Ranking among the foremost in the world; of an international standard of excellence; of the highest order: a world-class figure skater. 2. Great, as in importance, concern or notoriety.