What are the downpipe installation and acceptance methods for the downpipe specification?

The plumbing is becoming more and more diverse and more important for home decoration. Among them, wear-resisting, easy maintenance, and high performance-to-price ratio are favored by more and more people. The domestic sewage pipe is an important channel for drainage. The owners are most concerned about the specifications of the downpipe and the installation of the downpipe. So, what is the general size of the downpipe? What are the installation methods for the plumbing? Today I introduced you to the specifications of the plumbing and the tips for installation. I believe we must benefit from reading the following introduction.

Household water pipe specifications

The general household water pipe specifications are: DN15 (4 in charge), DN20 (6 in charge), DN25 (1 inch), DN32 (1 inch 2 pipe), DN40 (1 inch half pipe), DN50 (2 inch pipe), DN65 ( 2" half pipe), DN80 (3-inch pipe), DN100 (4-inch pipe), DN125 (5-inch pipe), DN150 (6-inch pipe), DN200 (8-inch pipe), and DN250 (10-inch pipe).

The pipe Φ25×1/2 means its outer diameter is 25. The actual corresponding nominal diameter is DN20 (that is, people often say 6 in charge). You can buy a 6-point faucet. You can also buy a 4 point faucet (just add a diameter between the tube and the faucet).

The styles and materials of household faucets are ever-changing, but the threaded parts that are connected to the pipes are divided into four points, six points, and one inch. Don't worry about buying the wrong one.

Generally speaking, the 4-pipe is in inches, so the 4-pipe is 1/2 inch (4/8=1/2), and one inch=25.4mm, so the inner diameter of the 4-pipe is 25.4/2=12.7mm. This is the inner diameter of the so-called DN15 water pipe.

4 points is the length of the inch diameter pipe, which is 1/2 inch, which is equal to the metric 15mm.

1 inch is equal to 8 points, and the metric system is 25.4mm.

6 points = 3/4 inches = 20 mm.

4 points = 1/2 inch = 15 mm.

Also keep in mind that the pipes are all calculated with the inner diameter, but the thread of the pipe is calculated with the middle diameter. It is expressed by the diameter DN, the thread is divided into metric M and imperial G, the pipe thread is generally in inch, and the thread angle is 55. Degrees, the metric system is 60 degrees.

Toilet plumbing specifications

Sewer specifications 75, 90 are said to have a nominal outside diameter dn. Do not go back to that point. Generally speaking, a few minutes or a few inches correspond to welded steel pipes, because when the welded steel pipe is processed, the thread processed on the pipe is an inch thread, only a few points or several inches are said. The PVC-U water pipe is adopted. Bonding, there is no such thing as a few points, a few words. Addition: PVC-U pipe with an outer diameter of 90mm can be called 90 PVC pipe. If the PVC-U pipe is connected to a cast iron drain pipe, the size corresponding to the drain pipe is DN75. In technical exchanges, it is not appropriate to refer to a PVC-U pipe with a nominal outer diameter of dn90 mm as 75. It is more correct to say that it is wrong. On the matter, the drain pipe connected to the toilet should be dn110mm, using dn70mm, dn90mm is not appropriate. There is no hard standard for the standard. Now the bathroom generally uses a pipe with a PVC inner diameter of 110.

Toilet plumbing specifications

The dimensions of toilet water pipes are generally 300mm, 350mm, 400mm, 450mm, etc. Choosing the right toilet first must choose the appropriate size of downpipe. When choosing the toilet, if you are going to decorate the tiles, be sure to measure the pit distance after the tile, otherwise there will be problems with the toilet to buy back, can not be installed, the conventional reserved wall surface, sit down: Behind the wall 300mm, the side of not less than 500mm (sitting center distance generally has the following common specifications - 200,220,280,300,320,350 mm). Conventional reserved net wall surface, squat toilet, behind the wall from 650--700mm (further rinse pipe is a bit short, you need to take long), the side is not less than 450mm.


General steps for plumbing installation

Step 1, material acceptance

The quality of construction materials will directly affect the quality of the construction and the hidden dangers caused by poor materials used in the future. Before installation, the pipes shall be strictly inspected. The inner and outer walls of the pipes shall be smooth and flat, free from air bubbles, cracks, cracks, dents, peeling, and severe cold spots and obvious marks.

Step 2, on-site delivery

The installer should carefully read the drawings to confirm the location of the water heaters, sinks, washbasins, washing machines, etc., and understand whether the owner or designer has special requirements. If there are special requirements, the construction should be done in accordance with the owner's or designer's instructions.

Step 3, pipe cutting

In order to avoid unnecessary waste during the installation process, the installer should measure the length of the required pipe to cut it. The pipe cutting adopts special pipe shearing, and the bayonets of the pipe clip should be adjusted to match the diameter of the pipe to be cut. When rotating and cutting, the force should be evenly applied. When the pipe is broken, the section should be perpendicular to the pipe axis. After cutting, the entire round section of the fracture should be cut. No glitches.

Step 4, pipe connection

PPR pipe and pipe fittings are connected by hot-melt method. The hot-melt connection is the most reliable, convenient operation, good airtightness and high interface strength. Before connecting, remove dust and foreign matter from pipes and accessories. The pipeline connection uses a fusion splicer to heat the pipe and fittings. The depth and time of heat fusion of the pipe and fittings should meet the requirements. Do not rotate while welding. When the tubing is connected, the raw material should be wound to ensure sealing.

Step 5, pipe fixing

In order to ensure that the water pipes will not be resonated due to water pressure in the future, all water pipes must be fixed with a pipe clamp. Pipes with a pipe spacing of 400-500mm, outer diameters below 25mm, pipe corners, water meters, and pipe ends shall be provided with 100mm pipe clamps. If the water pipe is in a special situation, the thickness of the mortar must be >100mm.

Toilet plumbing installation method

Before installing the bathroom plumbing, it is necessary to check whether there are any damages or cracks in the fittings, building materials, water pipes and related connection fittings. When the bathroom plumbing is installed, the builder must pre-think the thickness of the wall tiles.

Use as little or no connection parts as possible under the wall and under the ground. This will reduce the potential for leaks and ensure that the connection fittings are installed securely and leak-free. When installing the bathroom plumbing, it is necessary to consider the installation position of the faucet in the home washing machine, the layout of the water, etc., and also whether the position of the power outlet is appropriate.


Kitchen plumbing installation method

Under the drainage pipe installation, under the drainage is the drainage port on the ground, the sewage pipe vertically through the floor, the pipe directly to the downstairs, loading and drainage I used to install the backwater bend in the bottom, so if there is other In the water, you can share a single return trap to use the 50 water return traps. If there are other kinds of water, add the three links. Use the kind of inclined tee on the way above to make the water flow smoothly. Most of the time the kitchen water is more complex, and sometimes they all go around. The reason why the waterway is difficult to do is mainly because the area is too small. There are other electrical appliances in the cabinet, such as garbage disposal, kitchen pouch, water purifier, etc. Also connect the washing machine and so on.

The side drain is installed under the water pipe, and the side drain outlet is on the main kitchen pipe. Above the ground, a part of the downpipe leads to the main pipe. Under the drainage, there is a return bend under the building. If the upper floor is re-installed with the return bend, it is double-taste-proof. The side-drain is connected to the main sewer pipe horizontally. Generally only one return trap can be installed. The installation of such water is to connect the 45-degree elbow to the horizontal pipe and then to the half of the return-water trap. Note, however, that the return-water trap must be of the kind of triangular type. The round type is not well connected and finally connected. Other pipes, in general, do not drain as follows.

Upper and lower water pipe water acceptance method

1, the direction of the upper and lower water should be reasonable, pipe vertical and horizontal, there is no excessive corners and joints.

2. A new irrigation pipe is used for irrigation experiment, drainage is smooth, and there is no leakage or leakage of the wall.

3, the hot and cold water pipe outlet elbow should be in the same plane at the same height, the left hot right cold, away from 10 ~ 15CM, and is located directly above the drain.

4, the finished pipe to pay attention to finished product protection, prevent man-made foreign objects caused by secondary impact.

5, the drainage pipe to do drainage test, smooth water, no leakage of water.

6. There is no scratch on the surface of the pipe, and there is no dead bend on the hose.

7, pressure test should be done on the water pipe, pressure is generally 0.6 MPa, no leakage for 24 hours.

8, the pipeline must be installed firmly, after the water can not shake, loose phenomenon, no leakage at the junction.

9, do not forget to let the construction team leave the wiring diagram of the wire, especially the dark line, be sure to leave accurate electrical wiring to the map, in case of emergency repair needs.

Editor's summary: The above is the introduction of the water pipe installation and acceptance methods for household sewage pipe specifications. I hope to help those friends who have this requirement! For more information, please continue to pay attention to our website, follow-up will show more exciting content. You can also purchase your favorite product on Qijia Mall!

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