I database

工业气体的冷却与回收,气体的湿法净制和干燥,以及兼有气液两相传质和传热的增在吸收塔当中又有许多种类型防腐设备[牺牲阳极保护法] 此法是将活泼金属（如锌或锌的合金）连接在被保护的金属上，当发生电化腐蚀时，这种活泼金属作为负极发生氧化反应，因而减小或防止被保护金属的腐蚀。这种方法常用于保护水中的钢桩和海轮外壳等例如水中钢铁闸门的保护，通常在轮船的外壳水线以下处或在靠近螺旋浆的舵上焊上若干块锌块，来防止船壳等的腐蚀。 To be continued.
[外加电流的保护法] 将被保护的金属和电源的负极连接，另选一块能导电的惰性材料接电源正极。通电后，使金属表面产生负电荷（电子）的聚积，因而抑制了金属失电子而达到保护目的。此法主要用于防止在土壤、海水及河水中的金属设备受到腐蚀。 电化学保护的的另一种方法叫阳极保护法，即通过外加电压，使阳极在一定的电位范围内发生钝化的过程。可有效地阻滞或防止金属设备在酸、碱、盐类中腐蚀。
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杭州兴旺综合服务公司是一家以空调、

First, what is the PP-R Pipe Fittings ?

PP-R called the three types of polypropylene, used by the PP-R out of a pipe, injection into the tube. Europe is the early 1990s, the development and application of new plastic pipe products. PP-R is the end of the 1980s, the gas used COPOLYMERIZATION 5% of the PP in PE about the molecular chain of random uniform polymerization (-R) and a new generation of pipeline material. It has good resistance to impact and long-term creep properties.

Second, PP-R and PP-C What is the relationship between ?
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The previous period, the domestic market on a PP-C pipe, tube, the installation method consistent with the PP-R. Many people in the dark on PP-R and PP-C What is the difference, resulting in a lot of misunderstanding and confusion. International standards, polypropylene hot and cold water pipes at PP-H, PP-B, PP-R are not PP-C. On the market PP-C is actually the PP-B of its raw materials is a block of special PP-type pipe. PP-B is of a hot and cold water pipes, the price is cheaper, its heat and pressure performance and the gap between the PP-R great. For example: the use of conditions grade 2, 0.6 MPadn25mm design pressure pipe, PP-R wall thickness of 3.5 mm, PP-B (PP-C) pipe wall thickness to 5.1 mm; design pressure of 0.8 MPadn25mm, PP-R pipe wall thickness 4.2 mm, and PP-B (PP-C) can not be used. Because the requirements of a thick wall thickness. Market size and structure of PP-R line of the PP-C, lower than its terms can not be confused with the use of PP-R, not in determining conditions of use, to replace PP-C of the PP-R. Terms of Use 2 that the design temperature 70 ℃, heating water.
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3, PP-R What are the characteristics of the ?

PP-R pipe in addition to general plastic pipe light weight, corrosion-resistant, non-scaling, and other characteristics of long life

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• According to brass alloy elements contained in the different types
• even some enterprises operating at a loss
• Material from consideration
• Material from consideration
• Material from consideration

Material from consideration, pneumatic brake pipe materials used by a nylon tube, pipe Bundy, Zi Tongguan, and so on. What kind of pipe used, should be selected according to specific circumstances. As with the air compressor connected to the pipeline, it should adopt Zi Tongguan. Because of air compressors work will produce oil and water, in order to prevent pipe corrosion and affect other parts of the valve. Another reason is that the output of high-pressure air compressors have a certain air temperature, and the Zitong Guan better heat dissipation. Depression of the brake pipe used Bundy, should - before bending assembly. Bundy pipe connected to the majority through the pipeline joints, its biggest shortcoming is easy to leak.

Sorry,I must go.

Brake line is good or bad a direct impact on the gas and brake bus braking performance. Brake line and the lives of the passengers were related, the brake pipe technology is the pros and cons of passenger safety on the pre-conditions. According to brake pipe used by the different media, the brake pipe pressure brake pipe and a hydraulic brake line of distinction. Buses from the current situation, brake pipe pressure dominated, because of its larger power system, and high-pressure gas is more economic braking energy. Hydraulic brake line in the use of light trucks and mini-cars. Because it is the role of brake fluid, hydraulic braking more "flexible", the brake smooth. No matter what kind of brake line, the technical requirements are able to withstand a certain pressure of work and can withstand the external environment to their own influence.

Just have a rest. Just have a rest.

Hydraulic piping of oil pipeline routes, most of the use of Bundy. The technical requirements of a pipeline able to withstand oil, oil pressure in the anti-repeatedly under no expansion.

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Related Topics:

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• Building materials broadly classified into the following
• PPR formally known as the PP-R pipe
• The previous period

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