Thermal shrinkage sleeve is still used in the treatment of steel pipe anticorrosive patch, but many customers are not familiar with the shrinkage width of thermal shrinkage sleeve, that is, the patch width, in the process of purchasing, as mentioned above. According to the relevant requirements of industry standard SY/T0413-2002 and national standard GB/T 23257-2009, the small edition tells you how to determine the width of the filling in the use of shrinkable casing.
For calculating the width of the heat shrinkable sleeve, four aspects need to be considered, namely, the reserved length of the steel pipe, the overlap width of the polyethylene layer, the longitudinal shrinkage of the material and economic considerations. Among these four factors, the first two are the main factors. The third factor is the low-tech factor of heat-shrinkable pipes. The economic factors are more complex. We will introduce the location in detail. The above four factors will determine the width of the heat shrinkable casing and the heat shrinkable casing.
1. Reserved Length of Steel Tube
In the process of steel pipe processing, corrosion protection treatment will leave a certain length at both ends of the steel pipe for repairing. There is no clear stipulation on the length of the steel pipe's mending. In the actual use process, there is no actual stipulation for the leaf, and the diameter of the steel pipe has a certain impact on the length of the reserved section. Usually the reserved length will not exceed 150 mm, so it is common to use this data as a reference.
2. Overlap Width of Polyethylene Layer
In the process of repairing construction, heat shrinkable sleeve and polyethylene anticorrosive coating need to keep the fixed value of double-wall heat shrinkable pipe. At present, the value in national standard and industry is relatively standard, not less than 100 mm. It is common to use such value for reference.
3. Longitudinal Shrinkage Rate of Repair Material
In the process of construction, the width of heat shrinkable sleeve will be different from that of finished product. For such ratio, we call it longitudinal shrinkage rate. These values are related to the actual construction products, steel tube caliber and construction. They are relatively complex and generally require no more than 5%. Therefore, the smaller caliber, generally will not exceed the steel pipe anti-corrosion patch, for better quality products, will not consider this factor, if the patch is larger, can consider increasing the width of the material.
The repairing width of heat shrinkable sleeve is 500 mm. For small diameter steel pipe, the usage can be reduced, because the reserved section of steel pipe is usually small. In the process of purchasing, we need to take into account the needs of actual projects, so it is more reasonable to determine the width of heat shrinkable casing.
Heat shrinkable tube
It has the functions of coating, stress relief, insulation, anti-corrosion, electricity resistance and wear resistance.
Tin soldering ring
Preset solder rings provide controllable welding process with low melting point and good solderability.
_Easy to install, easy to operate and low cost.
Pre-positioned at the joints, heating, shrinkage of heat-shrinkable tubes, softening of rubber rings, simultaneous soldering and tin melting, and optional prefabricated lead-out grounding wires, easy and fast operation, eliminating the traditional welding and protection process.