GB 50015-2019 第3.5.9条
| **** | The pipes, fittings, and valves of hotel water supply pipelines (including cold and hot water) shall have a nominal pressure rating not less than the system design working pressure. Hot water pipes and fittings shall be of the same material or a matching heat-resistant grade, and pipe connections shall use dedicated heat-fusion or press-fit connections; threaded connections are strictly prohibited (plastic pipes). |