GUISAC is a leading diversified instrumentation Contractor providing a complete range of services for the Petrochemical, Oil & Gas and other Industrial sectors. GUISAC is specialized in plant instrumentation related to engineering, procurement, installation, commissioning, training, consultancy and services.

GUISAC is a group of three establishments ;
Global Unions Industrial Support Services Est., Global Unions Trading Est. And Global Unions Construction Est. All three establishments are focusing on the area of instrumentation support, maintenance, sells, installation and training. In addition, GUISAC has a partnership with international companies as Saudi and Golf Countries (CG) rep. The partnerships are in the area of representing engineering companies, and manufacturer of different type of instrumentation, such as control valves, positioner, limit switches, transmitters and measurements. GUISAC, also, provides services in the area of instrumentation such as meters calibration, SIL selection.