How do you choose heat shrink sleeves?
How to Select the Right Size of Heat Shrink Tubing
- Determine the diameter size of the tubing. Measure the diameter of the underlying materials to be covered – at the widest part.
- Determine the shrink ratio of the tubing.
- Determine the wall thickness of the tubing.
- Determine the length of the tubing.
What is the use of a heat shrinkable sleeve?
Heat-shrink sleeves have an adhesive that sticks the sleeve to the material and the factory-applied mainline coating, and also acts as a corrosion protective layer. The backing provides mechanical protection against abrasion and soil stress forces after the pipeline is buried.
How do you calculate heat shrink size?
Measure the width of the flattened piece with a set of calipers, if you have one, and multiply that figure by 2. Divide this figure by 3.1416 (pi) and the result will be the diameter of your heat shrink tubing.
What is heat shrink sleeve made of?
Heat Shrink Tubing Materials Common materials used for heat shrink tubing include: Polyolefin: Polyolefin is the most popular material for shrink tubing due to its thermal resistance. It is more expensive than PVC but capable of withstanding temperatures as high as 125-135°C.
How is cable thickness measured?
Measure the diameter with calipers. Place an electrical wire between the jaws of a set of Vernier calipers. Slide the movable jaw around the cable without compressing the insulation and read the measurement where the line from the moving indicator meets the stationary scale for a diameter.
How do you select heat shrink tubing?
Summary. In summary, the following elements should be taken into careful consideration when selecting the appropriate heat shrink tubing: The size of the object to be encased in order to determine the tubing inner diameter, shrinkage ratio, and length.
What material shrinks with heat?
Polymers like rubber shrink on heating as their molecular chains curl up, and water shrinks when warmed from its freezing point to around 4°C. After that, though, it behaves normally, and expands on warming. In contrast, so-called negative thermal expansion (NTE) materials never behave themselves.
What is a heat-shrinkable sleeve?
Heat-shrinkable sleeves are the most widely used technology in the world today for field-girth weld corrosion protection because they’re easy to install, provide excellent protection, and are cost-effective. A heat-shrink sleeve is also known as a heat-shrinkable sleeve or a shrink sleeve.
How much should I overlap the heat shrink sleeve?
Reheat the top 2 inches of the heat shrink sleeve before overlapping. Be sure to overlap downward.
What are the benefits of heat shrink sleeves?
Properly specified and applied heat-shrink sleeves can provide corrosion and mechanical protection that is equal to or superior to the mainline coating, be it a tape, epoxy or multi-layer polyolefin. It resists impact, abrasion and ultraviolet light as well as cathodic disbondment and dielectric breakdown.
How do you use a heat shrink sleeve on a torch?
Holding the propane torch at an angle allows the flame to bounce off the heat shrink sleeve and decreases the local intensity of the heat. If the flame is held too close to the surface, the heat shrink sleeve will burn and may tear around the burned areas. Use your body as a shield to protect the flame from the wind.