In the oil and gas industry, an important step in refining petroleum is fractional distillation, which takes place in tall towers that separate liquids by allowing vapors to rise and condense. When workers need to inspect or repair the inside of a fractioning tower, they face a host of dangers, including heat, confinement and of course elevation. It's an ideal use case for biometric monitors that allow companies to track both the location and the vital signs of workers. And biometric monitors, worn inside towers on a sprawling job site, are an ideal use case for private LTE, according to device-maker PK Solutions.