Contact: Cheng Huiqiang
Address：No. 333, Jinxian Road, Jinjiaba, FENHU Town, Wujiang District, Suzhou City, Jiangsu Province
When considering whether to use a heat shrinkable sleeve or a heat shrinkable tape, pay attention to the following issues: From a construction perspective, a heat shrinkable tape should be selected because the heat shrinkable tape does not need to be sleeved on the pipe before installation, and can be used when filling It will not be lost or contaminated due to hanging on the site tube for many days in advance or the quality of the heat shrinkable sleeve will decline under other climatic conditions, but from a quality perspective, because the heat shrinkable belt needs to be set up on the site, at the same time, It is also necessary to use a fixing sheet to fix the overlapped part, which not only increases the bonding area and edge, but more importantly, the overlapped part is two layers higher, which is easy to be scratched or scraped, especially when the level of the construction staff is not enough. It is easy to produce quality problems, so you should use heat shrink sleeves as much as possible. However, the quality of heat shrinkable belts has been continuously improved, large caliber heat shrinkable belts have short production cycles, low prices, and other objective reasons, and large-scale projects such as the West-East Gas Pipeline Project have selected heat shrinkable belts as fill materials. Heat shrinkable belts have become pipeline corrosion protection Main product of the patching material market.
Therefore, when selecting heat shrinkable sleeves and heat shrinkable belts, the following points can be consulted. (Heat Shrink Patch)
(1) In the construction section where the working space is small, the installation of the heat shrinkable sleeve is very inconvenient, and a heat shrinkable belt should be selected;
一分彩(2) Frequent wind and sand at the construction site, and other climatic conditions will have a large impact on the quality of the heat shrinkable sleeve hanging on the site for a long time, such as the destruction of the paper tape on the rubber surface of the heat shrinkable sleeve, severe degumming, etc. , You should choose heat shrinkable tape;
一分彩(3) In the case where the heat shrinkable sleeve is easy to be stolen or damaged. For example, if the quality of residents in a certain construction site is poor, a heat shrinkable zone should be selected.
一分彩(4) For directional drilling through projects, heat shrink sleeves are used, and thicker thicknesses are used to pass through heat shrink sleeves, because during the dragging process, the pipe section is dragged over a long distance, and even the boreholes are in the fine soil layer and unearthed There may also be hard materials such as concrete blocks, stones, and tree roots in the surface layer near the point and the point of entry. It is easy to fall from the point of entry into the borehole. During the reaming process, some hard substances may be squeezed onto the hole wall. Because the drag force is far greater than the edge adhesive force of the heat shrinkable sleeve and the heat shrinkable band, the edges of the heat shrinkable sleeve and the heat shrinkable band are easily torn when encountering such a hard object. Compared with the two, because the self-lap joint of the heat shrinkable tape, the strap is two layers higher (1 layer higher when it is overlapped, and another layer of the fixing sheet), the edge of this part is more easily torn, especially It is that the pipe section will also have a large range of rotation during the dragging process (there is a rotary joint between the drill pipe and the pipe.At present, in China, there are generally no additional measures to prevent the pipe segment from rotating during the dragging, and some do not allow the optical cable tube and The project that the supervisor was dragging together also dragged back). During the rotation of the tube, the annular smooth surface of the heat-shrinkable sleeve is not easy to tear, but the fixing sheet on the self-lap joint of the heat-shrink tape is easily scraped off, and the overlap seam of the heat-shrink tape along the longitudinal direction of the pipe is also easy. The opened and torn heat shrinkable zone will have a negative effect on the mud flow in the borehole. In some past directional drilling crossing projects, when the pipe section failed to pull back and was pulled out of the earthing point, there were scraped seals, lap edges, and repairs. Therefore, when you can only choose from heat shrinkable sleeves or heat shrinkable belts, you should choose to use heat shrinkable sleeves or heat shrinkable belts with reliable quality and related engineering performance. For example, the second line of the West-East Gas Pipeline Project uses products. Good quality manufacturers' heat-shrinkable tapes are used as material for pipeline crossing engineering.
一分彩(5) When there is a limit on the construction cost, the price of heat shrinkable sleeves or heat shrinkable belts is also an important reference factor, because the prices of heat shrinkable belts and heat shrinkable sleeves are different. Half the large caliber heat shrinkable belts are cheaper, less than 100 The caliber of steel pipe and heat shrinkable tape are not easy to produce. Even if it is made, the cost is relatively high. You can choose a heat shrinkable sleeve or wrap it with a heat shrinkable winding tape.
(6) When the project is due to be delivered quickly, when the production of heat shrinkable sleeves is not as fast as heat shrinkable belts, heat shrinkable belts should be used, and they do not need to be placed on the pipes first, which will not affect the construction of other units, resulting in greater personnel idleness, waste of machinery and Delay in project delivery.
Contact: Cheng Huiqiang
|Contact : Li Cong|
|Address: No. 333, Jinxian Road, Jinjiaba, Wujiang District, Suzhou, Jiangsu|