Chapter Ⅱ Installation（5. Installation and Heat Insulation for Pipelines of Water System）
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17）When installing the pipes, there should not be axial distortion. When the pipe is
penetrated to the walls or the floors, do not compulsorily adjust it. When the PP-R pipe is installed
in parallel with other metal pipelines, they should keep a certain protection distance that the net
distance should not be less than 100mm.
18）If the pipelines are open mounted indoors, it is suggested to install after finishing
plastering the walls. The position of reserving holes and pre-embedded pipes should be
rechecked before installation.
19）When the pipe penetrates through the floors, there should set sleeve for the pipe, the
height of sleeve extruded above the floor should be over 50mm, and should have waterproof
protection. If the pipe penetrates through the roof, there should have waterproof protection. It
should set the fixing support in the front end of pipe before penetrating; when the pipe penetrates
through the wall, there should set sleeve for the pipe.
20）The pipes directly embedded in the top layer of floor and walls should have conducted
pressure test before sealing the gap.
21）When installing the pipes, there should set support or hanger frame according to different
pipe diameters and requirements. The position should be accurate, the covering and mounting
should be flat and firm.
22）The pipe clip should firmly fix the pipe, but it should not damage the surface of pipe. It is
suggested to use plastic belt or rubber gasket between metal pipe clip and the pipe. When
connecting metal pipe parts with PP-R pipe, the pipe clip should be set in the end of metal part.
23）There should set fixing support when installing valves, water meter, floating valve and
other water supply accessories. When the fixing support is set on the pipe, the net distance with
water supply accessories should not be over 100mm.
24）The minimum size of pipe clips for support and hanger frame should be determined by the
pipe diameter. When the nominal outer diameter is not larger than DN50, the minimum width of
pipe clip is 24mm; when the project outer diameter is DN63 and DN75, the minimum width of pipe
clip is 28mm; when the nominal outer diameter is DN90 and DN110, the minimum width of pipe
clip is 32mm.
25）The distance between support/hanger frame and vertical pipe/transverse pipe should not
be over the following stipulated value:
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