REPLACEMENT OF AN AMMONIA STORAGE TANK

In June 1994, a proposed minor modification to an ammonia storage tank led to a review of its overall design and construction. This review u ltimately led to the tank being removed from service and a, replacemen t tank being constructed. This article describes: the design and const ruction of the tank; concerns that had developed in 1975, after a peri od of 20 years operation, consequential actions and the subsequent dis covery of cracking; the 1995 fitness-for-service review; the options f or replacement and differences between published recommendations; desi gn issues and consequences for the choice of construction material; an d the installation and commissioning of the tank.