The difference between PVC-U PIPE, PVC-O PIPE, PVC-M pipe

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The difference between PVC-U PIPE, PVC-O PIPE, PVC-M pipe

PVC-U PIPE, PVC-O PIPE, and PVC-M pipes are three different pipes. Although they are both made of PVC, the performance and uses of the three pipes are different. The pvc pipe manufacturer will introduce PVC-U, What is the difference between the three pipes of PVC-O and PVC-M pipes.

Rigid polyvinyl chloride pipe, referred to as PVC-U pipe, as a new type of building material, has attracted more and more attention and attention. It is light in weight, smooth, beautiful, small in water resistance, flexible in assembly, time-saving and labor-saving in installation, and is very popular among design, construction units and users. Therefore, the use of PVC-U pipes to replace traditional cast iron drainage pipes is becoming an irreversible trend and is quickly becoming popular throughout the country. At present, most of the pipes used in tap water transportation, domestic sewage discharge, and construction wires are rigid PVC pipes.

UPVC pipe

Compared with steel, iron, concrete and ceramic pipes, PVC-U PVC pipe has the following advantages:

Light weight, the relative density of the rigid PVC pipe is 1.43, which is only 1/6 of the weight of steel of the same size. -1/3.

Easy to connect and easy to install. Because the PVC-U pipe is light in weight, easy to connect, and has a certain toughness, it is easy to install. Compared with other pipes, the more complicated the pipeline system is, the more prominent the advantages of the PVC-U pipe are.

Good corrosion resistance and flame retardant properties.

Good electrical insulation performance, its volume resistance is about 1 × 10 ~ 3 × 10, and the breakdown voltage is 23 ~ 28Kv/mm.

Frictional resistance is small. The fluid velocity in the pipe is about 30% higher than that of the steel pipe, and there is less scaling and no rust. The flow rate and flow rate can remain unchanged for long-term transportation of water and other fluids; while the iron pipe will rust and scale, and after several years of use Both the flow rate and flow in the tube are reduced.

The thermal conductivity is small, the weather resistance is good, and the heat insulation performance is good.

Coloring is convenient, no paint is required, and it is easy to make pipes with various marking colors. The energy consumption in production is low, which is only 18.3% of that of cast iron pipes.

Long service life, the service life of traditional pipes is 20-30 years, and the service life of PVC-U pipes is not less than 50 years under rated temperature and pressure, and the maintenance cost is only 30% of cast iron pipes or concrete pipes.

PVC-U: Non-plastic PVC pipe is the most common type of pipe in the pipeline processing industry. The molecular structure of PVC pipes is a randomly arranged long chain structure, which is the most common in PVC pipes. Generally speaking, PVC molecules do not show obvious directionality, that is to say, its axial and radial strengths are consistent. Although CHINA PVC pipeline system has formed a huge scale with an annual output of more than 1 million tons, it has always stayed within the scope of traditional PVC-U. Many enterprises do not understand the trend and progress of PVC pipeline technology innovation in the world, because of technological progress. Slowness restricts further promotion and application.

PVC-O: PVC-O biaxially oriented pipe fittings, the extruded pipes are preheated for a second time and then oriented by axial and radial stretching to obtain pipes with higher strength and higher toughness. The molecular chain of the material forms an interwoven network-like lamellar structure through the biaxial orientation process. The thickness of this high-strength material can be thinner than ordinary PVC pipes, which not only reduces the production cost, but also makes the pipes have considerable toughness. Therefore, PVC-O pipes are not used as gravity pipes, and are mainly used in water supply pipes, mine pipes, pipes for trenchless laying and repairing, gas pipes, etc., especially in harsh environments with strict safety requirements and corrosive underground environments.

mpvc pipe

PVC-M: Modified PVC pipes can be obtained by incorporating additives or “impact modifiers” to increase the strength of the material. While maintaining the elastic modulus of PVC-U pipe, PVC-M pipe allows PVC pipe to be bent, folded, and even butt welded to a certain extent, and its toughness is between PVC-U and PE. Its good toughness improves the water hammer resistance and point load capacity of the pipe, and the wall thickness is 30% smaller than the corresponding PVC-U pipe, which is convenient for handling and transportation, and improves the safety of pipeline operation. The United Kingdom, Australia, South Africa and other countries already have national standards, and a large number of pipes are used in mines with harsh working conditions, requiring high strength and high toughness, and pipes for trenchless laying and repairing.

How to connect the broken PVC pipe

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How to connect the broken PVC pipe

We often encounter the phenomenon that the installed PVC sewage pipe is damaged in the middle. Because the bad part is in the middle, and the two ends cannot move, we have to dig it again according to the previous method. The pvc pipe manufacturer will introduce a method to you.

Tools and materials we need to prepare: hacksaw, hand hammer, PVC drain pipe, pipe hoop, PVC glue;

1. Damaged PVC drainage pipe in the middle, both ends of the hole are intact;

How to connect the broken PVC pipe

2.Use a hacksaw to cut off the part with the hole in the middle of the pvc pipe;

sawing pvc pipe

3.Use a hacksaw to cut off the dividing line in the middle of the pvc coupling

pvc coupling

4.Put the PVC coupling without a dividing line in the middle of the two ends of the PVC pipe that was just sawn off;

 

pvc couling join

5. Saw a piece of PVC short pipe of the same specification, so that the length is equal to the size of the middle gap, and the two ends of the middle PVC short pipe are marked with about 1/2 the width of the PVC coupling;

mark pvc coupling

6.After applying the special PVC glue on both sides of the two gaps, tap the two PVC coupling with a hammer to the position of the marked line in the direction of the arrow;

pvc coupling and pvc pipe

7. According to the above method, the entire PVC takeover can be easily completed

PVC pipe take over

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How to maintain PVC pipe during construction

 

How to maintain PVC pipe during construction

PVC pipes have long-term chloride ion precipitation, which is not suitable for water pipes, shock drops, and natural gas pipelines. However, PVC pipes are low in price, high in hardness, affected by temperature, and reduce heat and cooling. Therefore, PVC pipes are divided into PVC water supply pipes and PVC drainage pipes. For municipal water supply and drainage, industrial water supply and drainage, civil drainage, irrigation, plant watering.

pvc pipe

What is the construction and maintenance of PVC pipes?

The connection methods of PVC pipes mainly include sealing rubber rings, bonding, and flange connection. Pipes larger than 100mm in diameter usually use rubber band joints. Pipes with a pipe diameter of less than 100 mm usually use bonded joints, as well as union joints. Pipes often use metal pipes when crossing sewers or other pipes, in this case, plastic pipes use flanged connections to metal pipes. The valve front and rear and pipeline connections are also flange connections.

1. When the small-diameter pipe is glued with solvent, a groove should be formed around a small round on the socket to make the brake flat and the vertical axis, so as to be firmly bonded to avoid water leakage.

2. PVC pipes generally use rubber band joints for PVC pipes with a pipe diameter greater than 100 mm. Before installation, arrange personnel to chamfer the insertion part of the pipe to check whether the quality of the rubber band is qualified. When installing, wipe the bearings, rubber bands, etc. clean.

3. When excavating the trench installed on the existing pipeline, it should be able to put the pipeline into the trench and seal it. When the existing soil layer is not loosened, there is no need to ram the cushion with pressure.

4. Generally, the PVC branch can be split with a T-shaped or vertical water truce. During construction, you can add a saddle-shaped fitting and a half-shaped T-shaped piece, tighten it with U-shaped bolts to thicken the wall of the pipe, and then directly drill holes on it, open the teeth, and then support it with externally threaded plastic. Experiments show that, after construction using this method, the pressure acceptance can fully meet the requirements of the specification. In addition, the position where the thrust is generated by the water flow in the pipeline, such as elbows, T-shaped tees, and blocked pipe ends, also need to install a thrust wharf to withstand the thrust of the water.

5. As a new type of non-metallic pipe, PVC pipe cannot be detected by the existing metal pipe detection equipment, but this problem can be easily solved by burying wires on the pipe when the pipe is buried.

What is the installation structure of PVC pipes?

PVC pipes are widely used as pipeline materials in the construction industry, and their own characteristics can be fully reflected in the waterway system. So, what precautions should we consider when installing PVC pipes?

1. In order to ensure the safety and cleanliness of the PVC pipes, use brackets to place the pipes on them to ensure that the pipes are not placed in random places and are not trampled on by people. The pipes can also be used cleanly to prevent mud from being left on the pipes.

2. Before installing the PVC pipe, check the layout of the construction pipeline. Not only to be neat but also to make sure the structure is strong and smooth.

3. When installing, place the pipe gently to prevent damage during transportation, and pay attention to stones or mud remaining in the pipe.

4. After the installation of the PVC pipe is completed, we need to carry out a pressure test for a period of time, and check whether each interface leaks when re-testing. If leaks are found, replace them immediately.

Why does the PPR pipe have wall thickness deviation

 

Why does the PPR pipe have wall thickness deviation

For those in the non-PPR pipe and pipe fittings industry, it may be considered that the PPR wall thickness is a standard fixed value, but in fact, this is not the case. Regardless of the length, diameter, or wall thickness of the PPR pipe, there are deviations, and this objective deviation is also The china GT/T1874-22002 standard clarifies the permitted existence.

So why is there a deviation in the parameters of the PPR tube? We are a professional manufacturer of PPR pipes and fittings, let me introduce you to three main reasons:

1. PPR polypropylene resin itself has a shrinkage rate, which will affect the parameter value of PPR pipe length, diameter, and wall thickness
2. The stability of the PPR pipe production equipment will also affect the parameter values
3. The linear expansion coefficient of the PPR pipe will also affect the parameters after the PPR pipe is produced.

The diameter of PPR hot and cold water pipes for home improvement generally includes three specifications: D20, D25, and D32. For these three specifications of pipe series products, according to national standards, deviations are allowed within a certain nominal wall thickness range, and the deviation values are as follows:

Nominal wall thickness en Permissible deviation
1.0＜en≤2.0 +0.3
2.0＜en≤3.0 +0.4
3.0＜en≤4.0 +0.5
4.0＜en≤5.0 +0.6
5.0＜en≤6.0 +0.7

What we need to point out is that the above deviations exist objectively and are determined by objective factors such as physics and production. There will not be big differences due to different PPR brands. Reasonable deviations do not affect the quality. PPR tube users can choose it with confidence.