Chapter Ⅱ Installation（5. Installation and Heat Insulation for Pipelines of Water System）
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the position with auxiliary mark in the rectilinear direction of pipes according to the requirements of
design drawing;
7）When connecting pipes, insert the pipe end into heating jacket to the marked depth without
rotating the pipe end, and at the same time push the pipe parts to heating head where has
marked;
8）When it reaches the heating time, immediately take down the pipes and parts from heating
jacket and heating head, and then straightly insert them to the marked depth quickly without
rotating them to form an even flange in the joint.
9）Within the stipulated processing time, the joint that has just been welded can be adjusted,
but it cannot be rotated.
10）When carrying the pipes and parts, they should be well packed, should be handled with
care and kept away from oil stain; it is not allowed to impinge, throw, break, roll or drag the pipes
and parts.
11）The pipes and parts should be stored in the inventory or shack with good ventilation. It is
not allowed to place it outdoors or under direct sunlight, keep them away from fire or heat source;
12）Pipes should be horizontally piled in clean place. The parts should be piled by layers with
the height be not over 1.5m.
13）Do not use any damaged pipes or parts.
14）The mouths of pipe during installation of pipe system should be sealed or blocked in time.
If there is damage, the pipes should be replaced in time.
15）During installation, the pressure level and type of pipe for cold water pipe and hot water
pipe should be rechecked. The PP-R pipes of different types should not be mixed. The marks of
pipes should face forth.
16）For the pipes embedding into walls, there should reserve grooves. If the size of grooves
has no specific requirements, the depth of groove should be dn+ (20~30)mm, the width should be
dn+ (40~60)mm. If the horizontal groove is relatively long or the depth of groove is over 1/3 of the
thickness of wall, it should acquire the consent of professional technician. The surface of groove
should be flat and even that has no outshoots; there should have fixture for the pipe; after the
pipes have passed the pressure test, use M10 level concrete and mortar to fill up the gap. When
the branch of hot water pipe is vertically embedded, the paved M10 mortar layer on the surface
should not be less than 20mm;
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