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The correct response highlights that plastic piping is specifically not permissible for building services piping under ASME B31.9. This standard primarily applies to building services piping, including those systems for heating, cooling, and other utility services within buildings. While certain materials and types of piping are commonly permitted in other contexts, the application of plastic piping in building services is limited because of concerns related to temperature, pressure, and potential degradation of the material over time.

Understanding that ASME B31.9 establishes stringent guidelines to ensure safety, performance, and reliability is crucial. The exclusion of plastic piping reflects a cautious approach to maintaining these standards, especially in systems that often need to withstand significant thermal and mechanical stresses. Therefore, acknowledging that plastic piping is not appropriate for these applications reinforces the importance of using materials that can meet the specifications dictated by various codes for building services. This alignment is essential for both safety and compliance within the engineering and construction industries.