PPR flange standard

I need it too. I've been looking for it for a long time.

That's right. I'm waiting for urgent use now. I asked several suppliers and they all said that they don't have flanges under 50.

Do any of the seniors know about this? I am also encountering this problem now. I want to use ppr flange to connect ppr pipe and steel pipe. I don’t know if there is a 2-inch one.

Just give me the standard of an ordinary steel flange. If it can match the bolt holes of the steel flange and can be connected, it will be ok~!

I can't upload anything. So as long as it is posted in the form of words, please don't bother to read the detailed standard domestic water supply pipe of PPR pipe - polypropylene pipe (PP-R) is a new type of domestic water supply pipe currently being promoted and used in our country. It can be widely used in indoor cold and hot water supply systems and air-conditioning water systems. PP-R pipes are made of random copolymerized polypropylene material. It has the advantages of light weight, hygienic and non-toxic, good heat resistance, corrosion resistance and good thermal insulation performance. 1. Construction preparation 1. The construction technicians shall be familiar with the drawings carefully, understand the design intention, promptly contact the owner, supervisor and designer for problems found in the drawings, conduct joint review of the drawings, and keep records of the joint review. Installers must be familiar with the general performance of PP-R pipes and master the necessary operating points. 2. Before the start of each prefabricated processing project, prepare a material plan based on the design and construction drawings, prepare the required materials, equipment, etc. according to specifications and models, and transport them to the site. 3. Material and equipment requirements: Pipes and fittings arriving at the site must be carefully inspected and verified by the supervisor and owner for material quality, warranty, specifications, models, etc. Once qualified, they can be put into storage and marked separately. 1) The inner and outer walls of pipes and fittings should be smooth and flat, without bubbles, cracks, peeling, obvious marks or 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 or 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, they should be stacked flat. When handling pipes and fittings, handle them with care to avoid oil contamination. Violent impact, sharp contact, throwing, dropping, and dragging are strictly prohibited. 4) When there is a large temperature difference between the construction site and the material storage place, pipe fittings and pipes should be placed on site for a certain period of time before installation so that their temperature is close to the ambient temperature of the construction site. 2. Pipe installation: All indoor pipes should use PP-R pipes starting from behind the water meter. The diameter of the pipe entering the house is required.: House type Cold water pipe Hot water pipe Hot water return pipe Household pipe Water meter Household pipe water meter Household water meter One kitchen and one bathroom De25 DN15 De25 DN15 De20 DN15 One kitchen and two bathrooms De32 DN20 De32 DN20 De20 DN15 One kitchen and three bathrooms De40 DN20 De40 DN20 De20 DN15 One kitchen and four bathrooms De40 DN20 De40 DN20 De20 DN15 Installation process and requirements 1) Process flow 2) In order to ensure the installation quality, materials should be strictly inspected when incoming. The ellipticity of the pipe diameter should be <10%, the wall thickness deviation of the same section of the pipe should be <14%, and the inner and outer walls should be smooth and flat, without bubbles, cracks, cracks, dents, peeling, severe cold spots and obvious marks. 3= Pipe cutting• Pipe cutting can also be done by special pipe shearing: The bayonet of the pipe shear blade should be adjusted to match the diameter of the pipe to be cut. When rotating and cutting, force should be applied evenly. After cutting, the fracture should be rounded with a matching rounder. 1.8 • When cutting a pipe, the section should be perpendicular to the pipe axis and free of burrs. 4＝ PP-R pipe connection • Welding, hot melting and threaded connection can be used. Among them, hot melt connection is the most reliable, easy to operate, has good air tightness and high interface strength. The pipeline connection in this project uses a hand-held fusion splicer for hot-melt connection. • Before connecting, dust and foreign matter on the pipes and accessories should be removed. • Pipe connections use a welding machine to heat pipes and fittings, and the hot-melt depth of pipes and fittings should meet the requirements. Nominal outer diameter (mm) Hot melt depth (mm) Heating time (s) Processing time (s) Cooling time (min) 20 14 5 4 2 25 15 7 4 2 32 16.5 8 6 4 40 18 12 6 4 When connecting, insert the pipe end into the heating jacket without rotation to reach the predetermined depth. At the same time, push the pipe fittings to the heating head for heating without rotation. After the heating time is reached, immediately remove the pipes and pipe fittings from the heating jacket and heating head at the same time, and quickly insert them to the required depth without rotation and even force to form a uniform flange at the joint. During the specified heating time, the newly welded joint can be corrected, but rotation is strictly prohibited. Do not use excessive force when pushing the heated pipes and fittings vertically to prevent bending of the elbows. • After the connection is completed, the pipes and fittings must be held tightly for sufficient cooling time, and they can only be released after they have cooled to a certain level. • When PP-R pipes are connected to metal pipe fittings, PP-R pipes with metal inserts should be used as transitions. The pipe fittings and PP-R pipes are connected by hot-melt sockets. When connected to metal pipe fittings or hardware accessories of sanitary ware, threaded connections are used, and polypropylene raw material tapes should be used as sealing fillers. When installing, do not use excessive force to avoid damaging the threaded accessories and causing leakage at the connection. 5) When installing pipes, especially when installing hot water pipes, the thermal expansion factor of the pipes should be considered. When connecting pipes, pipe turns and bends should be used where space allows to naturally compensate for the expansion and contraction of the pipes. When natural compensation is used, sliding brackets are used for pipe supports, but the maximum length of straight pipes without fixed brackets must not be greater than 3m. The following methods can be used for natural compensation of pipeline tee connections and straight pipelines:: X: fixed bracket: |Sliding bracket 6) When the pipeline cannot utilize natural compensation, the pipeline uses fixed brackets to limit thermal expansion. The form of the fixed bracket is shown in the figure below.: Use two pipe hoops to install. Use pipe hoops and tees to install. 7) Pipe supports should be buried before pipeline installation. Pipe clamps and hangers should be set according to different pipe diameters and requirements. The position should be accurate and the burial should be smooth. The pipe clamps should be in close contact with the pipeline and the surface of the pipeline should not be damaged. When using metal pipe clamps, plastic or other soft objects should be used to isolate the metal pipe clamps from the pipes. At the connection point between metal pipe fittings and water supply PP-R pipes, the pipe clamp should be located on one side of the metal pipe. Fixed brackets should be installed at water supply equipment such as valves and water meters, and their weight should not act on the pipes. The maximum installation distance of hot and cold water pipe brackets is shown in the table below. When hot and cold water pipes share brackets, the spacing between hot water pipe brackets should be determined. Maximum installation distance of polypropylene pipe hot and cold water pipe brackets (mm) Pipe diameter (outer diameter) 20 25 32 40 Cold water horizontal pipe 650 800 950 1100 Riser pipe 1000 1200 1500 1700 Hot water horizontal pipe 500 600 700 800 Riser pipe 900 1000 1200 1400 8) Some of the indoor water supply pipes and air-conditioning water pipes are at the same position. Considering the layout of all indoor pipes, this part of the pipes can be arranged vertically on one side of the air-conditioning pipe. The bracket form is as shown below: The form of the fixed bracket is the same as above, and two pipe hoops can be used for installation. 9) The vertical and horizontal bending of horizontal pipes, the verticality of risers, and the installation deviation of rows of pipes must meet the following table. Polypropylene pipe installation allowable deviation (mm) Project allowable deviation Horizontal pipe vertical and horizontal direction bending 1.5 pipes per m Total length 25m ≯ 25 Verticality of vertical pipes 3 pipes per m Total length 5m ≯ 10 Spacing of rows of pipes on the same straight line 3 3. System hydraulic test requirements During the pipeline installation process, the hydraulic test can be carried out in layers or in a single set. The working pressure and test pressure of all pipelines are: the working pressure in the low zone is 0.4Mpa, the test pressure is 0.6Mpa, the working pressure in the high zone and the middle zone is calculated at 0.6Mpa, and the test pressure is 0.9Mpa. 　　After the pipeline system is installed, conduct a comprehensive inspection to verify that the installed pipes, valves, gaskets, fasteners, etc., all comply with the design and technical specifications. Remove the accessories that are not suitable for pressure testing with the pipelines and replace them with temporary short pipes. All openings should be closed, water should be filled from the lowest point, and air should be released from high places. Pipes that have passed the pressure test should be purged until the dirt is washed away, and various purging and cleaning records and pressure test records should be made. • The test pressure is 1.5 times the system working pressure, but shall not be greater than the allowable pressure of the pipe. • Water should be filled slowly during the test, and sealing inspection should be done after filling. • It is advisable to slowly increase the pressure to the test pressure with a hand pump, stabilize the pressure for 1 hour, and the pressure drop is less than 0.05Mpa, and then drop it to 1.15 times the working pressure and stabilize the pressure for 2 hours. Conduct a visual inspection. If there is no leakage and the pressure drop does not exceed 0.03Mpa, it is qualified. IV. Issues to note: 1. Avoid touching sharp objects when transporting and installing pipelines to prevent pipeline damage. 2. During pipeline installation, 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 damaging the threaded fittings and causing leakage at the connection. 4. When heating pipes and fittings, excessive heating should be prevented to cause the thickness to become thinner. The pipe is deformed within the pipe fitting. 5. Rotation is strictly prohibited during hot melt intubation and correction. 6. There must be no open flames at the operation site, and it is strictly prohibited to bend pipes with open flames. 7. Exposures where installation is interrupted or completed must be temporarily closed to prevent debris from entering. 5. Protection of finished products • Pipe fittings and pipes should not be exposed to sunlight for a long time. To avoid bending of pipes during storage and transportation, they should be stacked flat and the stacking height should not be greater than 2m. When handling pipes and fittings, handle them with care to avoid oil contamination. Violent impact, sharp contact, throwing, dropping, and dragging are strictly prohibited. • After the buried pipe is sealed, the location and direction of the concealed pipe should be clearly marked on the wall. It is strictly prohibited to impact or drive sharp objects such as metal nails onto the pipe. • After the track is installed, it shall not be used as a pull-bar, hanger, etc. 6. Safety precautions 1. You must wear a safety helmet when entering the construction site. Smoking and open defecation are prohibited at the construction site. Operating heights greater than 2m are considered high-altitude operations, and safety belts must be worn when working at high altitudes. 2. Use various machines correctly. The grinder cannot be reversed. People must stand on one side of the cutting machine when cutting to prevent the grinding wheel from breaking and hurting people. 3. When stacking and installing pipes, pay attention to fire safety and stay away from fire sources to prevent fires. , the distance from the heat source shall not be less than 1m, and the use of sun lamps for heating is strictly prohibited. 4. When using a herringbone ladder, you must install a connecting rope to ensure that the ladder is at an angle of 60°~70° with the ground. ； The bottom corners of the ladder are wrapped in rubber or linen to prevent slipping. , 5. After daily construction, the remaining materials on the construction site are required to be cleaned up. Technical characteristics of PPR hot and cold water pipes Nominal outer diameter dn (mm) Wall thickness e (mm) Nominal pressure (MPa) PN1.0 PN1.25 PN1.6 PN2.0 PN2.5 PN3.2 20 1.9 2.3 2.8 3.4 4.1 25 2.3 2.8 3.5 4.2 5.1 32 2.4 2.9 3.6 4.4 5.4 6.5 40 3.0 3.7 4.5 5.5 6.7 8.1 50 3.7 4.6 5.6 6.9 8.3 10.1 63 4.7 5.8 7.1 8.6 10.5 12.7 75 5.6 6.8 8.4 10.3 12.5 15.1 90 6.7 8.2 10 12.3 15.0 18.1 110 8.1 10 12.3 15.1 18.3 22.1 Project unit technical indicators Hydrostatic test short-term temperature 20℃ time 1h Ring stress 16MPa No rupture, no leakage Long-term temperature 95℃ time 100h Ring stress 3.5MPa, no cracking, no leakage, pendulum impact test

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I'm so crazy that I want to find a standard. Doesn't Haichuan have one?