1. Special Tools
- Blast burner or propane/butane spray gun with nozzles;
-
- Scissors;
- Steel wire brush;
- Grinder;
- Abrasive cloth;
- Cotton yarn
2. Installation of Heat Shrinkable Sleeve
a.
b. Notice not to peel off the plastic film and lining paper in order to prevent dirty materials from entering the sleeve.
3. Use primer
a. a.When the temperature of the steel body is between80℃to100℃, the first paint is to be made . Under the normal condition of temperature, blending with the proportion A and B, (one A matched one B).At the same time , the agitation should be even . In the winter seasons, the temperature should be heated to normal condition.
b. The applying with a brush should be even and quickly . It is better to do the work by two workers at the same time .
c. The thickness is about 100um
4. Treatment of Welding Seam
a.
b. Shear the pipe exterior coatings on both butt ends to bevel edges, use abrasive clothes or steel wire brushes to scrub the areas of pipe exterior coatings which will connect with heat shrinkable sleeve.
5. Pre-heat of Pipes
6. Heat of Shrinkable Sleeve
a.
b.
c. When the sleeve shrinking is almost finished, use small flame to heat the sleeve again but completely and equably. When the sleeve shrinking is completely finished, the heat melting glue will escape from the sleeve ends.
7. Application on Elbows
a.
b. If several sleeves are to be used at the tip of elbow to pre-make exterior coatings, the overlapping width should not be less than 80mm. The heating method is as same as the one on straight pipes.
c. 
Use several shrinkable
sleeves on the over crossing pipeline. The heating method is as same as the one
on straight pipes.
d. When the sleeves are used to protect flanges, you`d better fill in the bolts at the both ends of flanges with fillings in order to avoid breaking the sleeves during installation. The heating method is as same as the one on straight pipes.
Remarks:
If the project uses heat shrinkable sleeve methodology to protect the pipe-to-pipe connections, the non-coated width of pipe both ends should be strictly controlled when the pipes are coated externally. For the heat shrinkable sleeves with standard size, the non-coated width of pipe both ends shall be no more than 150mm. If this width is bigger than 150mm, the sleeve width should be increased together.
The overlapping width between sleeve and pipe exterior coating shall be no less than 80mm.
The installation shall be operated by experienced workers strictly according to the above installation method.
The pre-heat temperature of pipes must reach to the required 70-800C. If the temperature is lower, the adherence between the melting glue and pipes will become loose, which will reduce the exfoliation strength.
The sleeve heating should be done evenly. The overheating of partial area will cause the crack of sleeve.
We suggest installing the sleeve when the atmosphere temperature is above 00C. If the temperature is too low, it will be more difficult for you to preheat pipes.
