三种PP管材中，管材抗冲击性能PP-R>PP-B>PP-H，管材热变形温度PP-H>PP-B>PP-R，管材刚 性PP-H>PP-B>PP-R，管材常温温度PP-H>PP-B和PP-R，管材耐化学腐蚀性PP-H>PP-B和PP- R。

Among the three kinds of PP pipes， the impact resistance PP-R > PP-B > pp-h， the thermal deformation temperature pp-h > PP-B > PP-R， the rigidity pp-h > PP-B > PP-R， the normal temperature pp-h > PP-B and PP-R， and the chemical corrosion resistance pp-h > PP-B and pp-r.

给排水管的支吊架，有的施工人员为了节省费用，选择的型钢偏小，布置的数量没达到要求，或者布置的位置不合理。解决办法：在横管三通和弯头附近的地方一般要设置支吊架（此处一般受水流冲击力大些）。另外，对于upvc管而言，PVC管业加工，横管吊架设置的间距和它的dn直径相同，比如dn40的管吊架间距就为40cm。

For the supports and hangers of water supply and drainage pipes，PVC管业加盟， some workers choose small parts steel in order to save costs， the number of layout does not meet the requirements， or the location of layout is unreasonable. Solution: the support and hanger should be set near the cross pipe tee and elbow (the impact force of water flow is greater here). In addition， for UPVC pipe， the spacing of horizontal pipe hanger is the same as its DN diameter， for example， the spacing of Dn40 pipe hanger is 40cm.

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