PPR pipe specifications

The PPR pipe specification tube series S, nominal outer diameter dn × nominal wall thickness en is indicated.

Example: PPR pipe series S5, PPR nominal outer diameter dn25mm, PPR nominal wall thickness en2.5mm, expressed as S5, dn25 × en2.5mm.

The PPR pipe series S: is a dimensionless numerical series for indicating the ppr pipe specifications, and has the following relationship S = (dn-en) / 2en.

among them:

Dn——PPR nominal outer diameter, the unit is mm;

En——PPR nominal wall thickness in mm.

The commonly used PP-R pipe specifications are five series of 5, 4, 3.2, 2.5, and 2.

PPR pipe specifications PPR pipes are divided into five series of 11, 9, 7.4, 6, and 5 according to the standard size ratio SDR value.

PPR pipe specification PPR standard size ratio SDR: is the ratio of the nominal outer diameter dn of the PPR pipe to the nominal wall thickness en.

The relationship between the PPR pipe specification SDR and the PPR pipe series is as follows: SDR=2S+1

Representation of PPR pipe fitting specifications:

The nominal outer diameter dn of the PPR pipe refers to the nominal outer diameter of the PPR pipe connected to the PPR pipe. The wall thickness of the PPR pipe is not to be less than the wall thickness of the PPR pipe of the same PPR pipe series S.

Most of the company's PPR pipe fittings have only one series of the highest standard S2, and all the hot and cold waters are tried.

PPR pipe specification S5 series --------------1.25 MPa (12.5 kg)

PPR pipe specification S4 series -------------- 1.6 MPa (16 kg)

PPR pipe specification S3.2 series ------------ 2.0 MPa (20 kg)

PPR pipe specification S2 series -------------- 2.5 MPa (25 kg)

PPR pipe installation and connection method and construction and installation precautions

In addition to the characteristics of light weight, corrosion resistance, non-fouling and long service life, PPR pipe also has the characteristics of non-toxic, hygienic, heat preservation, energy saving, long service life and convenient installation.

First, PPR pipe connection method

The connection method of the PPR tube mainly uses a hot melt connection. If there is no good hot-melt joint operation method, even if a good pipe is selected, it is still difficult to ensure the quality of the pipe installation. To ensure the quality of the connection, first of all, you must choose the hot melt tool that is matched with the manufacturer. The heating time and heating temperature of the heat welder should be strictly in accordance with the operating procedures.

The PP-R pipe adopts the form of hot-melt connection, and the connection between the pipe and the pipe fitting can only be used once. Therefore, when the water supply pipe is concealed in the wall, it should be accurately cut according to the design requirements and the specific conditions of the construction site. If the pipeline is laid underground, care should be taken to minimize the number of interfaces in the buried section.

Carefully clean the pipe and joint surfaces before welding the pipe to remove oil, impurities and burrs from the pipe surface. It should be noted that the length of the pipe insertion pipe should be appropriate, and the pipe joint after the connection should form a uniform flange. If it is uneven, even if there is a gap on the other side, it means that the welding is not ideal, and it is difficult to ensure that the joint does not leak water. connection.

1. The connection between the pipe and the pipe fittings shall be by hot melt method. It is not allowed to directly thread the pipe and the pipe fittings, and the metal pipe may be flanged. For the connection with the water device, the pipe fitting with the metal insert must be used;

2, hot melt joint construction must use reliable quality hot melt equipment to ensure welding quality;

3, using special scissors to cut the pipe vertically, the incision should be smooth, no burrs;

4. Clean the welded parts of the pipe fittings to avoid damage to the joints caused by sand, dust, etc.; fix them on the fuser with a heating head matched with the size of the pipe to be welded, connect the power supply, and wait for the heating head to reach the optimum temperature;

5. Mark the welding depth on the pipe with a pencil;

6. Insert the pipe and pipe fitting into the fusion splicer and heat it according to the specified time;

7. After heating, take out the pipe and pipe fittings and connect them immediately. When the pipe and pipe fittings are connected, if the two positions are not correct, you can make a small amount of adjustment within a certain period of time, but the twist angle should not exceed 5 °C;

8. After the connection is completed, the pipe and the pipe fittings must be tightly held by both hands, and sufficient cooling time must be maintained. After cooling to a certain extent, the hand can be released and the next pipe can be installed.

After the pipe connection is completed, the position of the pipe should be indicated by colored paint on the wall or the ground to avoid damage to the pipe caused by the second decoration. The concealed water supply riser shall be fixed at the crossing of the floor to prevent the riser from accumulating and contracting and generating displacement stress at the exit of the uppermost branch pipe, causing damage to the branch pipe. At the same time, the installation of the pipe bracket according to the specifications is also very important for the installation of the PP-R pipe.

Second, PPR pipe installation and construction considerations

1. The construction personnel should pass the technical training of the installation of the three types of polypropylene pipes.

2. The supplied pipes and fittings shall comply with the design regulations and be accompanied by product specifications and quality certificates.

3. Do not use materials with signs of damage. If the pipeline quality is found to be abnormal, technical qualification or re-inspection should be carried out before use.

4. The opening of the pipeline system during installation should be blocked in time.

5. During the construction and installation, the pressure level and use occasion of the cold and hot water pipes should be reviewed. The pipe marking should face outward and be in a prominent position.

6. When the pipeline is installed, there must be no axial distortion. When crossing the wall or floor, it is not suitable for correction. The water supply polypropylene pipe should have a certain protective distance when it is laid in parallel with other metal pipes. The net distance should not be less than 100mm, and the polypropylene should be inside the metal pipe.

7. The indoor wall-mounted pipeline should be carried out after the civil engineering finishes are completed. The hole should be reserved or the pre-embedded casing should be properly reserved before installation.

8. When the pipeline crosses the floor, a steel casing shall be provided. The casing is 50mm above the ground and has waterproof measures. Strict waterproof measures should be taken when pipes pass through the roof. A fixed bracket should be provided at the front end.

9. The laying of pipes below the indoor floor should be re-excavated after the backfilling of the civil works. It is strictly forbidden to lay in the soil before or after the backfilling.

10. The bottom of the trench where the pipeline is laid should be flat and there should be no protruding hard objects.

11. When the buried pipeline is backfilled, the backfill of the pipe shall not be in contact with the hard wall and directly contact the pipe wall.

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