First, the problem of attention
1. Avoid handling sharp objects when handling and installing pipes to prevent damage to the pipes.
2. During the pipeline installation process, organic pollutants such as paint should be prevented from coming into contact with pipes and fittings.
3. When installing special pipe fittings with metal inserts connected to metal pipes, do not use excessive force to avoid damage to the threaded fittings and cause leakage at the joints.
4. When the pipe and pipe are heated, prevent excessive heating and thin the thickness. The pipe is deformed within the pipe fitting.
5. Rotating is strictly prohibited during hot melt cannula and calibration.
6. There must be no open flame at the operation site. It is strictly forbidden to bend the pipe with open flame.
7. If the installation is interrupted or the opening is completed, it must be temporarily closed to prevent debris from entering.
Second, the customer's attention before construction:
1. The water pipe is confirmed and the water equipment is positioned. The customer should determine the water pipe according to the decoration design drawings and the room structure. The water pipe direction can be divided into the ceiling arrangement, the wall groove arrangement, the ground arrangement and the open pipe installation. Which arrangement method and decoration are selected? The team negotiated. Positioning of water equipment: For example: pre-filter, booster pump or buried wall faucet in the pipeline system, before installing the water pipe, and determine the placement position, otherwise it will affect the construction.
2. Is the wall slot open and the original old pipe removed all the places where the water discharge equipment needs to be installed, such as: the height and depth of the wall tank such as water heater, basin, toilet, bathtub, etc. (the width of the wall slot, the single slot is 4cm) The double groove is 10cm and the wall groove depth is 3-4cm. The wall groove height is determined by the water equipment.
3, through the wall hole, such as the diameter of the wall of a single water pipe is 6cm, such as the diameter of the wall of the two water pipes is 10cm or two wall slots with a diameter of 6cm.
Third, PPR pipeline construction preparation
1. The construction technicians are familiar with the drawings, understand the design intent, contact the owner, supervisor and design personnel in time for the problems found in the drawings, and review the drawings and make a record of the meeting. The installer must be familiar with the general performance of the -PP-R tube and master the necessary operating points.
2. Before the start of each prefabricated processing project, prepare the material plan according to the design and construction drawing, and prepare the required materials and equipment according to the specifications and models, and transport them to the site.
3. Material and equipment requirements: Pipes and fittings to the site must be carefully inspected and supervised, the owner shall verify the materials, check the warranty, specifications, models, etc., and then put them into the warehouse after being qualified, and make the marks separately.
1) The inner and outer walls of the pipe and fittings should be smooth and flat, free from air bubbles, cracks, peeling and obvious marks and dents, and the color should be basically the same.
2) The end face of the pipe should be perpendicular to the axis of the pipe. Pipe fittings should be complete, without defects, without deformation
3) Pipe fittings and pipes should not be exposed to sunlight for a long time. To avoid bending of pipes during storage and transportation, stacking should be smooth. When handling pipes and fittings, care should be taken to avoid oil stains, strong impacts, and sharp touches, throws, falls, and tows.
4) When the temperature difference between the construction site and the material storage is large, the pipe fittings and pipes should be placed on the site for a certain period of time before installation, so that the temperature is close to the ambient temperature of the construction site.
Fourth, PPR pipeline installation requirements
1. In order to ensure the quality of the installation, the material should be strictly inspected when it is purchased. The ellipticity of the pipe diameter should be <10%, and the wall thickness deviation of the same section of the pipe should be <14%. The inner and outer walls should be smooth and flat, without bubbles, cracks, cracks, Depression, peeling and severe cold spots and obvious marks.
2, pipe cutting
Pipe cutting can also be cut by special pipe: the pipe cutter blade should be adjusted to match the diameter of the pipe to be cut. When the rotation is cut, the force should be evenly applied. After cutting, the complete round of the complete rounder should be applied to the fracture. When the pipe is broken, the section should be perpendicular to the pipe axis and free of burrs.
3. Connection of PP-R pipe
Welding, hot melt and threaded connections are available. Among them, the hot-melt connection is the most reliable, the operation is convenient, the airtightness is good, and the interface strength is high. The pipe connection of this project uses a hand-held fusion splicer for hot-melt connection.
Remove dust and foreign matter from pipes and accessories before connecting. The pipe connection uses a fusion splicer to heat the pipe and fittings. The hot melt depth of the pipe and fittings should meet the requirements.
When connected, the tube end is inserted into the heating jacket without rotation to a predetermined depth. At the same time, the tube is pushed onto the heating head without rotation to heat, and after the heating time is reached, the tube and the tube are immediately removed from the heating sleeve and the heating head, and the tube is quickly and non-rotatingly and evenly inserted into the required depth, so that A uniform flange is formed at the joint. The newly welded joint can be calibrated within the specified heating time, but rotation is strictly prohibited. When the heated pipe and pipe are vertically aligned, do not use excessive force to prevent the elbow from bending.
After the connection is completed, the pipe and the pipe must be tightly held for a sufficient cooling time, and after cooling to a certain extent, the hand can be released.
When the PP-R pipe is connected with the metal pipe fitting, the PP-R pipe with the metal insert should be used as the transition. The pipe fitting and the PP-R pipe are connected by the hot melt socket, and are connected with the metal pipe fittings or the hardware fittings of the sanitary ware. When using a threaded connection, a polypropylene raw tape should be used as the sealing filler. When installing, do not use excessive force to avoid damage to the threaded fittings and cause leakage at the joint.
4. When installing pipelines, especially hot water pipes, the thermal expansion factors of the pipelines should be considered. When the pipelines are connected, the pipelines are bent and angled to compensate the expansion and contraction of the pipelines. Where the natural compensation is used, the pipeline supports adopt sliding brackets, but no The maximum length of the straight pipe of the fixed bracket shall not exceed 3m.
V. Hydraulic test requirements
During the pipeline installation, the hydraulic test can be carried out in layers or in a single set. The working pressure and test pressure of all pipelines are: low working pressure is 0.4Mpa, test pressure is 0.6Mpa, high and medium working pressure is 0.6Mpa, and test pressure is 0.9Mpa.
After the installation of the pipeline system is completed, check the installation, check the installed pipes, valves, gaskets, fasteners, etc., all of which meet the design and technical specifications, remove the fittings that are not suitable for testing with the pipeline, and replace them with temporary shorts. Tube, all openings are closed, and the water is filled from the lowest place, and the air is vented at a high place. The pipe that has passed the test pressure is purged until the dirt is washed out, and various purge and cleaning records and pressure test records are prepared. jobs.
The test pressure is 1.5 times the working pressure of the system, but not greater than the allowable pressure of the pipe.
Water should be injected slowly during the test. Sealed inspection should be done after filling.
The pressure should be gradually increased to the test pressure by hand pump, stabilized for 1h, the pressure drop is less than 0.05Mpa, then lowered to 1.15 times of the working pressure for 2 hours, and the appearance inspection, no leakage and no leakage pressure does not exceed 0.03Mpa is qualified.
Sixth, finished product protection
1. Pipe fittings and pipes should not be exposed to sunlight for a long time. In order to avoid bending of the pipes during storage and transportation, the stacking should be flat and the stacking height should not exceed 2m. When handling pipes and fittings, care should be taken to avoid oil stains, strong impacts, and sharp touches, throws, falls, and tows.
2. After the buried pipe is sealed, it should be clearly placed on the wall, indicating the position and direction of the hidden pipe. It is strictly forbidden to impact or nail metal spikes on the pipe.
3, the road can not be used as a pull, hanger, etc. after installation.
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