Recommended time to purchase water pipes: before water and electricity renovation

1. Type of water pipe material

The selection and installation of water pipes in the "hidden project" become the decoration An issue that cannot be ignored. In order to make the home beautiful, people generally use buried wall construction when decorating. Once water pipes leak or burst, it will bring irreparable consequences.

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In the past, the main pipes used for water supply were cast iron pipes. Sand molded cast iron pipes are mainly used outdoors, and galvanized cast iron pipes are used indoors, which can be divided into cold (electric) galvanizing and hot-dip galvanizing. Galvanized pipes are used as water pipes. After several years of use, a large amount of rust will occur in the pipes. The yellow water flowing out not only pollutes the sanitary ware, but is also mixed with bacteria that breed on the rough inner wall. The rust causes excessive heavy metal content in the water, seriously endangering human health. The state has stipulated that sand cast pipe fittings and cold-dip galvanized cast iron pipes will be eliminated from June 1, 2000, and the use of hot-dip cast iron pipes will be gradually restricted, and the use of aluminum-plastic composite pipes and new plastic pipes will be promoted. Therefore, there are three main categories of pipelines currently in use. The first category is metal pipes, such as plastic-lined hot-dip cast iron pipes, copper pipes, stainless steel pipes, etc. The second category is plastic-coated metal pipes, such as plastic-coated steel pipes, aluminum-plastic composite pipes, etc. The third category is plastic pipes, such as PP-R (cross-linked polypropylene high-density mesh engineering plastic).

The state also stipulates that all pipes and accessories involving drinking water pipes must have approval from the health department before they can be sold. The following introduces several common types of water pipes and how to identify them when purchasing:

(1) Plastic-clad metal pipe-aluminum-plastic composite pipe

Aluminum-plastic composite pipe is the most common type of water pipe on the market. A popular pipe material that is lightweight, durable and easy to construct. Its bendability is more suitable for use in home decoration. The main disadvantage is that when used as a hot water pipe, long-term thermal expansion and contraction may cause the ferrule connection to become misaligned and cause leakage. There are many varieties of aluminum-plastic composite pipes currently sold on the market, with great differences in quality and price. How to choose aluminum-plastic composite pipes has become a headache for consumers.

① Check the appearance of the product

High-quality aluminum composite pipes generally have smooth outer walls. The trademark, specification, applicable temperature, meter number, etc. are clearly marked on the pipe wall. The manufacturer is clearly marked on the pipe wall. The production number is also printed to prepare for monitoring product quality at any time; the product is well packaged, and the various logos on the package are equally clear. The manufacturer's name, address, phone number, etc. are all printed in prominent positions. Fake and inferior products generally have rough outer walls, unclear or incomplete markings, simple packaging, and unknown factory addresses or phone numbers.

②The aluminum layer cannot be ignored

A good aluminum-plastic composite pipe has welding at the overlap of the aluminum layer, and the aluminum layer and plastic layer are tightly combined without delamination. Some fake and inferior products have aluminum layers that are not welded at the overlap, and some aluminum layers and plastic layers are often delaminated and not tight.

(2) Plastic pipe-PP-R pipe

As a new type of water pipe material, PP-R pipe has unique advantages, including non-toxic, light weight, and durability. It is pressure-resistant and corrosion-resistant. It adopts a special hot-melt connection method and will not corrode or rust. Moreover, PP-R pipe will not scale and is becoming a popular material. Due to its relatively simple production process, there are currently a large number of counterfeit products on the market. In order to help owners initially identify authentic and fake PP-R pipes and fittings based on their appearance and feel, you can refer to the following identification methods:

< p>① Product name: The product name of true PP-R should be "polypropylene pipe for hot and cold water" or "PP-R pipe for hot and cold water", and any product named ultra-fine particle modified polypropylene pipe (PP-R ) or PP-R cold water pipes, PP-R hot water pipes, PP-E pipes and other informal names are pseudo PP-R pipes.

②The density of pseudo PP-R is higher than that of real PP-R. R is slightly larger.

③The real PP-R tube is white matte or other colors of matte, and the fake PP-R tube is bright or colorful.

④The real PP- The R tube is completely opaque, and the fake PP-R tube is slightly translucent or semi-transparent.

⑤The real PP-R tube feels soft, and the fake PP-R tube feels smooth. >⑥The sound of the real PP-R pipe falling to the ground is dull, while the falling sound of the fake PP-R pipe is crisper.

It should be noted that the service life of the fake PP-R pipe is only 1-5 years. The service life of real PP-R pipes is more than 50 years.

(3) Metal pipe-copper pipe

Copper pipe has the advantages of corrosion resistance, sterilization, etc. It is the top grade among water pipes. The copper pipe interface has a ferrule. and welding. Like aluminum-plastic pipes, ferrules have the problem of aging and water leakage for a long time. Therefore, most users who install copper pipes use the welding method. Welding means that the interfaces are welded together through oxygen. In this way, they can be the same as PP-R water pipes. leakage. One disadvantage of copper pipes is that they conduct heat quickly, so the hot water pipes produced by well-known copper pipe manufacturers are covered with plastic and foaming agents to prevent heat dissipation. Another disadvantage of copper pipes is that they are expensive. Very few residential areas have copper pipes in their water supply systems. I am afraid they can only be seen in export apartments and high-end villas. If you plan to replace the water pipes and think copper pipes are good, it is recommended that you use welded interfaces.

(4) Metal pipe-stainless steel pipe

It is a very expensive water pipe. It is difficult to construct and is rarely used. Its performance is similar to that of copper pipe.

Other similar knowledge:

Water pipe knowledge: summary of the classification of water pipes

Types of water pipes and their respective characteristics

Five common decoration uses Comparison of the pros and cons of water pipes

Classification of water pipe knowledge, joints and fittings

2. Purchase of water pipes

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1. Home furnishing PPR water pipes, steel-plastic water pipes, and copper pipes are generally used for decoration water pipes. The price of steel-plastic pipes is relatively high, while the price of PPR water pipe accessories is higher than that of steel-plastic pipe accessories. Copper pipes are the most expensive, and the price is about 4 times that of PPR pipes. .

2. When laying water pipes in home decoration, you should try to avoid laying them from the ground. It is best to run them from the top or wall. The amount of pipes may increase slightly, but it will be beneficial to future pipeline repairs.

3. The wall thickness of hot and cold water pipes is different. Cold water pipes cannot be used as hot water pipes. A simple way to distinguish hot and cold water pipes is that there is a red line mark on the hot water pipe.

4. The standard length of PPR pipes is four meters each. When buying, you should ask clearly whether the merchant is talking about the price of each pipe or the price of each meter. Remember to check the pipes after they are delivered. Whether the length meets the requirements.

5. Pay attention to the diameter and wall thickness of water pipes for home decoration. Generally, 6-branch pipes are used for main pipes, and 4-branch pipes can be used for branch pipes. In order to ensure water consumption, 6-branch pipes can also be used for branch pipes.

6. When purchasing pipes for home decoration, pay attention to whether the inner diameter of the pipe is uniform. Uneven pipe diameters will affect the docking of the two interfaces.

7. The "Quality Specifications for Home Decoration and Decoration Projects" of the Building and Decoration Industry Association stipulates the time and pressure of the pressure test: newly installed water supply pipes must be pressure tested in accordance with relevant regulations. The test pressure of metal and composite pipes is 0.6MPa, and the pressure is stabilized for 10 minutes. The pressure drop in the pipe should not be greater than 0.02MPa, without leakage. The test pressure of plastic pipes is 0.8MPa, and the pressure is stabilized for 20 minutes. The pressure drop in the pipe should not be greater than 0.05MPa, without leakage. leakage.

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Purchase of PPR pipes

PPR water pipes are highly used in home decoration. The safety of water pipes is the safety of the entire decoration. The premise is that high-quality PPR water pipes have a long service life and high safety, which can save a lot of unnecessary troubles. However, many low-quality and fake PPR water pipes in the building materials market are now inferior, which requires consumers to keep their eyes open to distinguish the authenticity. Now that the fake ones are out of the way, the editor will teach you four tricks so that you can easily identify the authenticity of PPR water pipes.

At a glance

First of all, look at the appearance. High-quality pipes have a smooth appearance, complete logos, and brand names on the accessories; inferior products cannot do these. Because high-quality pipes use 100% imported PPR raw materials, and inferior pipes only use part of PPR raw materials, there is a big difference in performance between the two. High-quality PP-R water pipes have a soft and bright color and an oily texture, while low-quality PP-R water pipes are mixed with inferior plastic. Even the color of lime powder is unnatural, the cut section is dry and oily, and it feels like chalk dust has been added.

Second touch

Toughness: Good quality PPR pipes have good toughness and can be easily bent into a circle without breaking, while inferior pipes are brittle and break when bent. The inner and outer walls of high-quality PP-R water pipes are smooth and have no uneven cracks, while the inner walls of inferior PP-R water pipes are rough and have a concave-convex feeling.

Three weights

High-quality PP-R water pipes are heavier than inferior PP-R water pipes, because most high-quality PP-R metal pipe fittings have more than three waterproof leakage trenches The copper parts of the groove (copper content is greater than 58%), the copper parts are longer in size and thicker, so they are heavier than inferior PP-R pipe fittings.

Four-burning

High-quality PP-R raw material is a hydrocarbon chain compound. When the flame temperature is higher than 800 degrees Celsius, under ideal combustion conditions and sufficient oxygen, the combustion is Only carbon dioxide and water vapor are released, and there should be no odor and residue when burning. Inferior PP-R water pipes will have odor and residue when burned due to the mixing of inferior plastic and other impurities. You can cut thin slices from PP-R water pipes and burn them with a lighter to identify them.

In addition, good PPR water pipes can still maintain their hardness under high water temperatures, while inferior pipes are softened at 60 degrees water temperature. High-quality products have a 50-year warranty, while inferior products only have a 5-6-year warranty.

Other similar knowledge:

Things to note when purchasing water pipes

How to identify the quality of PPR water pipes directly from their appearance

Purchase Three points to pay attention to with PPR water pipes

3. Installation of water pipes

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How to install water pipes in the safest way during home decoration

< p>1. No matter how luxurious and high-end the decoration of your home is, if you are not willing to spend money on it, it will not be worthwhile. Often the bursting or blockage of a pipe will cause tens, hundreds of times or even immeasurable consequences to the price of the water pipe itself.

2. A boost test must be performed after installation. The pressurization test is generally carried out at 1.5 times the water pressure, and there should be no water leakage during the test.

3. Simple test method without pressure, but not completely feasible.

1. Close the main valve of the water pipe. (That is, the water pipe switch in front of the water meter)

2. Open the faucets in the room for 20 minutes, make sure there is no water dripping, and then close all faucets.

3. Turn off the water inlet switches of equipment with water storage functions such as toilet tanks and washing machines.

4. Open the main valve of the water pipe.

5. Check whether the water meter is moving 20 minutes after opening the main valve, including slow movement. If there is movement, it is a leak. If you're not moving around, you're probably fine. (If there is a problem with the water meter or micro-seepage in the water pipe, it may be difficult to determine.) Therefore, it is recommended that a water pressure test be carried out after construction. Generally, the pressure is 8 kg for 20-30 minutes. (It is best to see it in person)

4. Direction of water pipes: It is recommended that the water pipes are safest to go to the top.

The main reason is that most of the waterway reconstruction is through underground pipes, and the characteristic of water is that water flows to lower places. If the pipeline is underground, it will be difficult to detect a leak in time. The leak will only be discovered when the water floods the mountain or the floor deforms and leaks downstairs. Moreover, it is difficult to detect the leak because the water pipe is hidden. At this time, the huge loss is irreparable and even seriously affects the friendly neighbor relations. If the water pipe is routed to the top, the cost of water modification may be higher, but as a long-term investment, it is worth it. If the water pipe goes to the top, even if it leaks, it can be discovered in time, which makes it easy to repair and the loss is small.

5. In daily life, if you find the following situations, please check the relevant pipelines as soon as possible.

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When the water pipe runs from the top:

1. There is dampness or water dripping on the ceiling

2. There is dampness or moisture on the wall tiles where the pipe runs. There is water seeping out

Other similar knowledge:

Is the water pipe going from the top or the ground?

How to install PP-R water pipes correctly

Installation process of PPR water pipes

4. Water pipe brands and products

Water pipes in 2013 Top Ten Brands

1. Jinde Water Pipe (China Famous Trademark, Chinese Famous Brand, China Environmental Labeling Product Certification, Jinde Pipe Industry Group)

2. Aikang-Poly Water Pipe ( Shanghai Famous Brand, the leading brand in the Shanghai decoration materials market, Shanghai Aikang New Building Materials Co., Ltd.)

3. Sorbonne-Piersa Water Pipe (the only designated product for the construction of the Chinese Antarctic Expedition Station, Shanghai Piersa Pipe Industry Co., Ltd.)

4. Weixing Water Pipe (China Famous Trademark, China Famous Brand, Top 500 Chinese Private Enterprises, Weixing Group Co., Ltd.)

5. Golden Ox Horn Water Pipe (China Famous Brand , high-tech enterprise certification, Wuhan Jinniu Economic Development Co., Ltd.)

6. Rifeng Water Pipe (Chinese Famous Brand, China Well-known Trademark, Guangdong Famous Brand, Guangdong Province Export Famous Brand, Rifeng Enterprise Co., Ltd.)

7. Baidie Water Pipe (High-tech Enterprise, Environmental Labeling Certification, Shanghai Baidie Pipe Technology Co., Ltd.)

8. Lesso Water Pipe (Chinese Famous Brand, China Famous Trademark, Industry Well-known Brand, Guangdong Lessu Technology Group)

9. Zhongcai Water Pipe (China Famous Brand, China Famous Trademark, Key High-tech Enterprise, Zhejiang Zhongcai Pipeline Technology Co., Ltd.)

10. U.S. Ergu Water Pipe (recommended product of China’s green and environmentally friendly building materials, famous and high-quality building materials product of Shanghai, Shanghai Jinsu Industrial Co., Ltd.)