PCS Nitrogen Ltd. (a wholly owned
subsidiary of Potash Corp.), operates four ammonia plants at
the Point Lisas, Trinidad, facility. The smallest unit, the No.
3 ammonia plant with a nameplate capacity of 750 stpd was built
in 1965 for Collier Carbon & Chemicals, Brea,
California. In 1994, the plant was relocated to Point Lisas,
Trinidad. Over time, the plant capacity was increased to 830
stpd through minor modifications mostly to the back of
the ammonia synthesis loop. Previous expansion studies showed
that further rate increases were economical due to favorable
natural gas (NG) costs in Trinidad. Likewise, new developments
in ammonia converter technology would improve operating
costs of this older unit. However, these studies also
identified the primary reformer as a major bottleneck. This
case history explores the planning and design stages used to
revamp the primary reformer of the No. 3 ammonia unit.