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09-10 

Advantages of polyurethane insulation pipe

1. This kind of pipe has good thermal insulation performance, and the heat loss is very small during the transportation process, which is only one-fourth of that of traditional pipes compared with traditional pipes. In this way, long-term use of this energy-saving pipeline can save a lot of energy. 　　2. This kind of pipeline construction is very convenient, that is, the overall cost is relatively low, and it has strong corrosion resistance and impact resistance. 　　 3. Polyurethane insulation pipe has a particularly long service life. 　　4. Because of the particularity of polyurethane insulation pipes, in the production process, the production cost of polyurethane insulation pipes is very low, which leads to the price of polyurethane is also very suitable. During installation, if polyurethane insulation pipes are used, a lot of installation costs can be saved. related suggestion

09-10 

What should be paid attention to in the maintenance of stainless steel elbow

There are many problems in the use and maintenance of stainless steel elbows, which require users to use them in a certain way, and use and maintain them in an accurate and fair manner. The considerations are as follows: 　　1. Stainless steel elbows stored for a long time should be checked in time, and the exposed surface should be kept clean, dirt removed, and stored neatly in a ventilated and dry place indoors. Stacking or open storage is strictly prohibited. Stainless steel elbows are always kept dry and breathable, and the holder is clean and tidy, and stored in accordance with accurate storage methods. 2. During installation, the stainless steel elbow can be directly installed on the pipeline according to the connection method, and the stainless steel elbow can be installed according to the location of use. Under normal circumstances, it can be installed in any position of the pipeline, but it requires easy-to-operate inspection. Note that the flow of the stainless steel elbow medium should flow under the longitudinal valve flap, and the stainless steel elbow can only be installed horizontally. When installing the stainless steel elbow, pay attention to sealing to prevent leakage and affect the normal operation of the pipeline. 3. When using stainless steel elbow ball valves, globe valves and gate valves, they can only be opened or closed, and the flow rate must not be adjusted to avoid wear of the sealing surface. The gate valve and the upper threaded globe valve are equipped with an inverted sealing device, and the handwheel is fastened to the top to prevent media Leakage from the filling point. 　　 4. Use the hand wheel to make stainless steel elbows. Do not use levers or other tools to avoid damage to valve components. Turn the handwheel clockwise to close, and vice versa. When using, we should be fair and ensure the correct use of methods and means. 　　5. The bolts of the stainless steel elbow valve packing cover should be evenly tightened, and should not be pressed into a bent state, so as not to interfere with the movement of the valve stem or cause leakage. 　　 6. The stainless steel elbow should be kept clean during use, and the transmission thread must be lubricated in time. Once a fault is found, it should be stopped immediately to find out the cause of the fault.

09-10 

Precautions for the use of stainless steel elbows

Stainless steel elbows are mainly different from carbon steel elbows in material, and their chemical composition will prevent the surface of the elbow from rust and corrosion for a long time. In piping systems, elbows are pipe fittings that change the direction of the pipeline. From an angle of view, the three commonly used are 45° and 90°180°. In addition, according to engineering needs, other abnormal angle bends such as 60° are also included. 　　\ 　　 elbows are made of cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics. Pipeline connection methods include: direct welding (common method) flange connection, hot melt connection, electrofusion connection, threaded connection, socket connection, etc. According to the production process, it can be divided into welding elbow, stamping elbow, hot pressing elbow, pressing elbow, casting elbow, forging elbow, clamping elbow, etc. Other names: 90° elbow, right angle bend, love bend, white steel elbow, etc. 　　Precautions for the use of stainless steel elbows one. During installation, the stainless steel elbow can be directly installed on the pipe according to the connection mode, or according to the use position. Under normal circumstances, it can be installed in any position of the pipeline, but it needs to be sealed to prevent flushing leakage and affect the normal operation of the pipeline. two. When using ball valves, globe valves and gate valves with stainless steel elbows, they can only be fully opened or closed. They are not allowed to be used for flow regulation to avoid sealing. three. For long-term storage of stainless steel elbows, regular inspections should be carried out. The exposed processing surface should be kept clean, the dirt should be removed, and stored neatly in a ventilated and dry place indoors. Stacking and open storage are strictly prohibited. Always keep the stainless steel elbow dry and ventilated, keep the retainer clean and tidy, and store it in accordance with the accurate storage method.

09-10 

How are flanges connected and sealed?

The flange connection structure is an assembly, which is composed of a pair of flanges, several bolts, nuts and a gasket. In practical applications, it is rare that the flange seal fails due to the strength of the coupling or the strength of the coupling, and more often it leaks due to poor sealing. Therefore, the main problem to be solved in the design of the flange connection is to prevent the leakage of the medium. 　　The principle of flange sealing is that the flange compresses the gasket between the sealing surfaces under the action of the bolt pre-tightening force. The pressure (compression stress) applied to a unit area must reach a certain value to deform the gasket and be compacted, and the micro-gap formed by machining on the sealing surface is filled to form the initial sealing condition. The required compression stress is called the gasket seal specific pressure, expressed in y, and the unit is MPa. 　　. The specific sealing pressure is mainly determined by the gasket material. Obviously, when the gasket material is determined, the wider the gasket, in order to ensure the due specific pressure, the greater the pre-tightening force required by the gasket, and the larger the size of bolts and flanges are required, so the flange connection The middle gasket should not be too wide, and the entire flange surface should not be covered with gaskets. When the equipment or pipeline is in working condition, the axial force formed by the internal pressure of the medium causes the bolt to be stretched, and the flange sealing surface moves in the direction apart from each other, reducing the compression stress between the sealing surface and the gasket. If the gasket has sufficient resilience, the compression deformation recovery can compensate the deformation of the bolt and the sealing surface, and the pre-tightening seal specific pressure value will at least drop to a certain value (this specific pressure value is called the working seal ratio Pressure).