UPVC pipe has poor heat resistance, and its tensile strength decreases in an environment above 60 ° C (it is suitable for domestic sewage whose continuous discharge temperature does not exceed 40 ° C and instantaneous discharge temperature does not exceed 80 ° C). Therefore, the design and use should be away from the heat source, such as distance from the kitchen edge is greater than or equal to 400mm, distance from the hot water pipeline is greater than or equal to 200mm, at the same time the hot water pipeline should take heat preservation measures, shall not pass through the flue and firewall.
The impact strength of hard POLYvinyl chloride drainage pipe decreases at low temperature. Therefore, cast iron pipes can be used instead of hard PVC drainpipes in the air-conditioned equipment transfer layer to ensure drainage safety.
Due to the influence of temperature, large expansion coefficient, each layer of riser and long horizontal pipe are required to set expansion joints. Therefore, the gap effect of UPVC pipe should be considered in other professional layout. When laying in parallel with other pipes, the plastic pipe should be sidled. When laying across, the plastic pipe should be under and staggered, and metal casing protection should be considered. In addition, the riser through the floor roof should be used as a fixed support point, and flexible jacket should be installed.