Hardware operation that alternates between standby and running, e.g., a pump with an installed spare, each of which operates for a comparable amount of time.
Notice: The AIChE website is undergoing an ecommerce system upgrade to better serve you. Between 7 a.m. (EST) Friday, December 6 and 9 a.m. (EST) Monday, December 9 you will not be able to purchase or renew any AIChE products or services through the website. Customer Service phone lines are open 9 a.m. to 5 p.m. Monday through Friday... Learn more