Due to the good adhesion characteristics of polyethylene heat shrinkable tape, it is widely used in pipeline joint coating, big and small head, valve sealing and so on. Heat shrinkable tape, do you know what to pay attention to when storing and installing polyethylene heat shrinkable sleeve
1、 What should be paid attention to when polyethylene heat shrinkable sleeve is stored
1. When the polyethylene heat shrinkable sleeve is stored, avoid direct sunlight and put it indoors as far as possible. Any product will be damaged irreversibly after being exposed to sunlight for a long time, making the object brittle and deteriorated.
2. Storage temperature should not be too high, too high temperature will easily lead to oxidation of the product, and may also lead to product shrinkage.
3. Avoid being wet by water during storage, and take waterproof measures.
4. Far away from the fire source, the polyethylene heat shrinkable sleeve has flame retardant effect, but its effect is limited. When encountering a particularly large fire, the product itself can not prevent the spread of fire.
5. Do not come into contact with chemicals, such as acid or alkali, which will corrode the product, so keep away from it.
6. When storing, try to choose the room with low temperature and appropriate humidity. If possible, wrap the product with winding film to prolong its service life.
2、 Precautions for operation of polyethylene heat shrinkable sleeve
1. For pipes with pipe diameter more than 900 mm, anticorrosive primer and cold wrapping tape shall be used.
2. Only when the cathodic protection current reaches the metal surface can the corrosion be inhibited. Due to the poor adhesion between the polyethylene heat shrinkable sleeve and the anti-corrosion coating of the pipe, it is easy to wrinkle and crack under the action of sunlight or soil stress. At the weld.
3. It is very difficult to achieve no bubbles, no hollowing, if moisture into the f side, moisture will enter the interior along the weld. Because of its insulation effect, cathodic protection current can not reach the corrosion surface and can not prevent corrosion.
4. The polyethylene heat shrinkable sleeve has high mechanical strength, which can improve the anti mechanical damage ability of the pipeline in the trench. This is also the basic starting point of using it.
5. It is difficult to heat the pipe surface evenly, especially when the pipe diameter is large, resulting in the uneven shrinkage of the polyethylene heat shrinkable sleeve. After the pipeline is buried, the heat shrinkable sleeve is still creeping and losing the adhesion with the pipeline.
6. Once the moisture enters the lower part of the belt, the cathodic protection cannot work and corrosion cannot be prevented due to its current shielding effect.
At the same time, we must pay attention to some pipes or equipment is not suitable for polyethylene heat shrinkable sleeve, so before using, we must investigate whether the heat shrinkable sleeve is suitable for use. And Xiaobian reminds you not to use it in high temperature environment as far as possible, to avoid affecting the performance and quality of the product.
The surface area of the steel pipe needs to be calculated when purchasing the hot-rolled tape. The calculation formula is very simple, for example, the diameter of φ 168, the length of 12m is 3.14 * 0.168 * 12m = 6.33m2 This 6.33 M2 is the surface area of the steel pipe, but it does not mean the square number of the purchased winding tape. There will be overlapping parts in the winding construction of the winding belt. Generally, according to the requirements of the national standard, the lap width is 55%, which is 13.93 m2. Considering the joint part, it can be purchased about 14.5 square meters.
Processing technology guide. In the production process and after production, it is necessary to carry out strict processing technology test to see whether the production of the product is suitable for the processing rules, if not, immediately improve. It is necessary to meet the relevant processing rules of production line equipment. Before the production of heat shrinkable tape and heat shrinkable tape, it is necessary to check whether the machine and equipment are normal, the ambient temperature, the final speed, and the standard must be set according to strict standards. Or the personnel should record th
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