Siirtec Nigi is an engineering and contracting company operating worldwide. We primarily design and supply proprietary technologies, process plants and equipment for sulphur recovery units including acid gas enrichment, Claus, tail gas treating (HCR™), oxygen-enriched Claus, degassing and incinerator units. We offer a wide range of services from basic design, FEED, detail engineering to project management, procurement, construction supervision and start-up. Facilities for the oil and gas field, NG and refinery gas treatment are other areas of business.