The seminar presented by Kunal Sharma covers the importance of Piping Material Specification (PMS), detailing components like pipes and fittings, and emphasizing its role in guiding design and procurement for various projects. It explains that PMS varies based on client requirements and includes essential factors like material selection, temperature, pressure, and applicable standards. An example of PMS used in a crude pipeline project demonstrates material choices and construction types for common piping systems in the oil and gas industry.