With offices in Baton Rouge, Beaumont, Corpus Christi, Houston, and Columbus, as well as job sites around the country, ISC has grown our team as high 3,000+ associates and offers full-service engineering, construction, and maintenance solutions throughout the United States. Witness testing of cable hi-pots and megs, pressure testing of air pipe and impulse lines, calibration of transmitters, control valves, spec checks of instruments and electric devices.