Cost and quality. I worked on a new chemical plant in Singapore. Everything was fabricated as modules in yards all around the world. A lot of work can be don

Cost and quality. I worked on a new chemical plant in Singapore. Everything was fabricated as modules in yards all around the world. A lot of work can be done in lower cost countries, like building pipe racks in the Philippines. Ship all the modules to site then everything is bolted and welded together, wired up. The only stuff that's really done at site (besides integration) is the underground utilities, foundation work, and then commissioning.