How to select aluminum alloy pipes

In recent years, with the deepening promotion and implementation of energy saving of compressed air system, the definition of compressed air system has been extended from the narrow sense of air compressor station equipment to the broad sense of transmission pipeline, terminal gas consumption, gas consumption equipment, leakage, waste heat recovery and utilization, environment of air compressor station, management and operation of compressed air system and environmental protection. Among them, the transmission pipeline is moving from the "cold palace" to the "front desk", from less choice and consideration in the past to more choice and anxiety today. Why do you say that?

In terms of domestic market, before the 12th Five Year Plan, China's economy was in a high energy consumption and high quantity development mode. In terms of compressed air transmission pipes, there were no high-quality products. Customers can only choose high-pressure PVC gas pipes, galvanized pipes and seamless steel pipes; After the 12th Five Year Plan, affected by energy shortage and environmental protection, China's economy has changed to a high-quality development mode driven by innovation, and aluminum alloy pipes and thin-walled stainless steel pipes have gradually appeared. There may be other new materials applied to compressed air transportation. In the past, there was no choice but to follow the crowd and not make mistakes. And now? There are more varieties, and there is more room for choice. I'm afraid I'll be anxious if I choose the wrong one. So how to make pipes? The following three aspects can be considered:

Galvanized pipe, also known as galvanized steel pipe, is divided into hot-dip galvanized and electro galvanized. The hot-dip galvanized layer is thick and has the advantages of uniform coating, strong adhesion and long service life; The cost of galvanizing is low, the surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipe.

It is mainly used for conveying gas and heating.

Characteristics: the galvanized pipe contacts with water, and after several years of use, a large number of rust scale and bacteria will be generated in the pipe; Due to welding, the pressure resistance is weak; The inside is rough and uneven, and the pressure drop of the pipe is large; Welding is required during installation; But it's cheap.

. seamless pipe, made of one piece of metal, with no joint on the surface. Materials include ordinary and high-quality carbon structural steel, low-alloy steel, alloy steel, stainless and acid resistant steel, etc. According to the purpose, it can be divided into two categories: general purpose (for water and gas pipelines, structural parts and mechanical parts) and special purpose (for boilers, geological exploration, bearings, acid resistance, etc.).

It is mainly used for petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes and high-precision structural steel pipes for automobiles, tractors and aviation.

Characteristics: because it is a one-time molding, it has strong pressure resistance and small internal smooth pressure drop; Welding is required during installation: heavy weight.

Aluminum alloy pipe, due to its low density and high strength, is close to or higher than high-quality steel and has good plasticity. It can be processed into various profiles with excellent conductivity, thermal conductivity and corrosion resistance. Due to different production processes, aluminum alloy pipes are divided into slotted pipes and seamless pipes. The welding of aluminum alloy instead of steel plate material can reduce the structural weight by more than 50%. However, due to the expansion coefficient, aluminum alloy pipes are easy to fall off when the temperature difference is large. The imported galvanized pipe is very easy to use, but the price is expensive.

It is widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry.

Features: high strength and light weight, smooth inside and small pressure drop; Welding is not required for installation.

Thin wall stainless steel pipe is a hollow long round steel. When the bending and torsion strength are the same, the weight is light. Stainless steel is divided into seamless pipe and welded pipe according to production mode.

Widely used in petroleum, chemical, medical, food, light industry, mechanical instruments and other industrial transmission pipelines and mechanical results components.

Features: high strength and light weight, smooth inside and small pressure drop; Welding is not required for installation. From the perspective of energy saving, environmental protection and healthy application, the pipe is the main force of fluid transportation in the future. In the field of water affairs and water supply, major promotion has been started.