Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.
The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.
These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.
This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).
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With the introduction of the "New Energy Law", the tilt of the national policy, and the impact of the external environment of the entire society on energy saving and consumption reduction, the fourth generation of water heaters - air energy heater industry has brought new opportunities for development.
“It is expected that the market size of air-energy water heaters will exceed 2.5 billion yuan this year, and will grow at a rate of 30% each year thereafter.†In the recent energy-saving popular science community activity organized by the Guangdong Provincial Economic and Trade Commission, the Guangdong Provincial New Energy Electrical Appliances Professional Committee Director Tang Yukui told reporters.
1KW electric energy can generate 4KW heat energy
As the fourth generation of water heaters for air energy products, its biggest feature is embodied in energy saving and environmental protection, but due to its insufficient marketing efforts, it leads to low consumer awareness.
Zhang Jianguo, chief engineer of the Energy Saving Information Communication Center of the National Development and Reform Commission, said in an interview with this reporter that the energy saving of air energy water heaters is that only 1/3 of its energy comes from electricity, and the remaining 2/3 of the energy comes from the atmosphere. Its principle is to use a very small amount of electric energy, absorb a large amount of low-temperature heat energy in the air, and turn into high-temperature heat energy through compression of the compressor, transfer it to the water tank, and heat the hot water, so it has low energy consumption and high efficiency.
"Using heat pump technology to absorb heat from the air, with 1KW of electrical energy can produce 4KW of thermal energy," Tang Yukui also said that compared with solar energy, it makes up for the lack of solar water heater due to the impact of the climate and the installation conditions. Its energy consumption is 1/3 of gas water heaters and 1/2 of solar water heaters. Air-energy water heater manufacturers even set up energy-saving "combat" platforms at the "popular community activities" site to show that air energy water heaters are the most energy-efficient.
Nearly 100 enterprises vie for cake
According to the data, after experiencing an increase in market volume in 2004, the market size of air-energy water heaters has reached about 200 million in 2007, and will increase at a rate of 30% each year thereafter.
"So far, nearly 100 companies have participated in market competition," said Xie Desheng, secretary-general of the Guangdong Home Appliances Chamber of Commerce. In addition to professional leading brands Tongyi and Kangtemu, they include some of the strengths of the United States, Gree, Vantage, Vanward and others. Companies have also entered this field one after another. Among them, the market size of the United States this year will exceed 1.60 billion yuan.
He said that at present, new energy electrical appliance industry clusters including wind power generation, solar power generation, solar water heaters and air-energy water heaters have basically taken shape in Guangdong Province, especially the air-energy water heater industry, and Guangdong has become the country's major production base.
This reporter learned that the air-energy water heater market is also facing the two major bottlenecks of "consumer awareness is not high" and "industry chain supporting services are not sound." In this regard, people in the industry believe that this situation will improve with the market cultivation of leading brands over the years and the entry of more and more giant companies.
It is expected that the market size of air-energy water heaters will exceed 2.5 billion yuan this year, and will increase at a rate of 30% each year.