What is an indoor water supply pipe

- Aug 27, 2018-

What is an indoor water supply pipe?

Like the outdoor water supply pipe, the indoor water supply pipe is mainly divided into two categories: metal pipe and non-metal pipe.

1, metal tube

At present, there are many indoor metal water supply pipes that are mainly used, such as steel pipes, water supply aluminum alloy lining plastic pipes, and water supply copper pipes.

1.1 steel pipe

The steel pipe has the points of welded steel pipe and seamless steel pipe; in terms of anti-corrosion performance, it can be divided into protective layer type, unprotected layer type and texture type; according to wall thickness, there are ordinary steel pipe and thick steel pipe. The protective layer type is divided into a metal protective layer type and a non-metal protective layer type. The non-metallic protective layer type has a steel-plastic composite steel pipe, and the metal protective layer type has a surface-plated protective layer type surface pressure-bonding protective layer type. The surface coating protection layer has cold and hot-dip galvanized steel pipes, and the surface is pressed and protected.

Commonly welded steel pipe, ordinary seamless steel pipe, stainless steel pipe and galvanized steel pipe have detailed specifications in various design manuals, and their application technology is relatively mature, so we will not introduce more. Here, the stainless steel tube, the steel double stainless steel tube, the metal surface pressure-protected layer steel tube, the copper tube and the like are introduced. 1.1.1 stainless steel tube

Stainless steel pipes are available in stainless steel welded pipes and stainless steel seamless pipes. According to the thickness of the pipe wall, there are stainless steel pipes and thin-walled stainless steel pipes. The promotion and application of thin-walled stainless steel pipes that appeared in China in the late 1990s are gradually being accepted and accepted by everyone. Thin-walled stainless steel tube

The thin-walled stainless steel pipe treated by the special welding process has a high strength, a thin wall and a low cost, which effectively promotes the application and development of the stainless steel pipe. The superior performance of thin-walled stainless steel tubes also includes:

(1) Durable, hygienic*, good corrosion resistance and good environmental protection.

(2) Strong impact resistance. The strength of the pipeline with better connection form (such as plug-and-pressure connection technology) is 2-3 times that of galvanized pipe and ordinary steel pipe.

(3) Good toughness. It is more flexible than ordinary metal, easy to twist, not easy to crack, not easy to break.

(4) Adopting mature and versatile dedicated connection technology, greatly improving the progress and efficiency of the project.

Stainless steel pipe connection [7]: Common pipe types are compression type, compression type, push type, welding type and the connection series of welding and traditional connection.

Thin-walled stainless steel pipes are used for direct drinking water pipes or high-standard building indoor water supply pipes installed along the external walls of buildings due to their relatively high pipe prices. Ultra-thin wall stainless steel plastic composite pipe

The ultra-thin wall stainless steel plastic composite pipe is a new type of pipe made of an outer layer of ultra-thin wall stainless steel pipe, an inner layer of plastic pipe and an intermediate adhesive.

Its performance characteristics:

(1) The outer stainless steel pipe wall is thinner, the inner lining plastic pipe wall thickness is also reduced, and the main material price is further reduced.

(2) Surface stainless steel isolates the plastic tube from the outside world, overcomes the shortcomings of plastic oxidative aging, and improves the flame retardant performance and compressive strength of the plastic tube.

(3) The intermediate adhesive restricts the expansion of the lining plastic pipe, and the coefficient of linear expansion of the pipe is small.

Stainless steel bonded pipe fittings, stainless steel, copper and other ferrule fittings can be used, and the connection method is various and convenient to install. It can be designed and constructed according to the existing technical standards of plastic pipes. The current common specifications of the pipeline are more than ten kinds of outer diameters of 16-110mm.

1.1.2 steel-plastic composite steel pipe

Steel-plastic composite steel pipe is mainly composed of water-coated plastic composite steel pipe and water-lined plastic composite steel pipe. Water-coated plastic composite steel pipe

The excellent properties of water-coated plastic composite steel pipes are:

(1) Safe and sanitary, low price.

(2) Good anti-corrosion performance, acid resistance, alkali resistance, high temperature resistance, high strength and long service life. Superior impact resistance mechanical properties.

(3) The medium flow resistance is lower than 40% of the steel pipe.

Common specifications are more than 10 nominal diameters DN15-DN150. The plastic-coated composite steel pipe is connected by three types: pipe thread, flange and groove. Water-lined plastic composite steel pipe

The main performance of the water-supply-lined plastic composite pipe is similar to that of the water-supply steel-coated composite pipe. For the lining-plastic composite steel pipe, the thermal conductivity is low, which saves the thickness of the material for heat preservation and anti-condensation. In addition, under the condition of the outer diameter, the cross section of the water is small, and the water flow loss and the flow velocity are increased. Common specifications are more than 10 nominal diameters DN15-DN150.

1.1.3 Metal surface pressed protective layer steel pipe

The surface pressure-bonding protective layer type is also divided into a physical covering type composite steel pipe and a chemical blasting covering type composite steel pipe according to different production processes. Physical overlay composite steel pipe

The physical-covered composite steel pipe has been produced with steel-forged stainless steel composite steel pipe and copper-steel bi-metal composite steel pipe, all of which are physically pressed to the steel base by a certain process by a heat-softened thin-walled stainless steel pipe or a cold-thin-wall copper pipe. On the inner wall of the tube.

Its common performance characteristics:

On the one hand, it carries forward the advantages of high pressure resistance (2.5MPa), high impact resistance, wide temperature range (-40-150°C) and high strength of galvanized steel pipe. On the other hand, it has the advantages of galvanized steel pipe. The water transfer protection wall is thick and the joint is tight*, so the corrosion resistance is strong and the hydraulic conditions are good.

The specifications of the two pipes are DN15-DN300 and DN15-DN150. Pipe connections are often connected using special accessories. Chemical blasting covered composite steel pipe

The chemical blasting covered composite steel pipe has a bimetallic composite pipe. It is a new type of lining anticorrosive pipe produced by the 41st Institute of Aerospace Science and Technology Group, which adopts the patented technology - "Metal Pipeline Explosion and Lining Technology". According to the introduction [8], the product still uses carbon steel pipe as the base material, giving full play to the excellent mechanical properties and low-cost characteristics of the carbon steel pipe; using the corrosion-resistant alloy material as the anti-corrosion coating layer, giving full play to the excellent corrosion resistance of the corrosion-resistant alloy, Thereby, the bimetal composite pipe has excellent corrosion resistance and excellent mechanical properties.