With technology born of the atomic age, shrink sleeves are unique in their ability to perform safely and efficiently:
- Two-layer and three-layer constructions complement wide range
of pipe coatings
- Top quality hotmelt, copolymer coated sleeves resist elevated
pipe operating temperatures and soil stresses on all pipe
- Mastic-coated sleeves balance performance, economy and ease
- Three-layer sleeves with epoxy primer and hotmelt copolymer
have excellent resistance to both cathodic disbondment and hot
water immersion even at maximum rated operating temperature
- Fiber-reinforced sleeves withstand the high stresses of
- Dimpled backing providing a patented “permanent change”
indicator for application of heat.
All pipeline coatings need to be correctly installed in order to achieve long-term, corrosion-free service. Installing heat-shrink sleeves is very simple – the essential 3 steps are:
Step 1: Surface preparation
Blast-clean the steel to SA 21/2 and sweep-blast adjacent line coating to roughen-up the surface. On certain sleeve types (power wire) brushing is allowed.
Step 2: Preheat joint area
Most sleeves require a steel preheat of 50°C – 80°C (122°F – 176°F). This is easy to achieve using propane gas torches. Induction heating can be used for sleeve types requiring a preheat temperature greater than 150°C (302°F). Note: 3-layer sleeves require the application of liquid epoxy after preheat.
Step 3: Shrink the sleeve
Using a propane torch, heat is applied to the sleeve, which has been wrapped around the preheated area. Every part of the sleeve needs to receive a minimum amount of heat.
The Permanent Change Indicator (PCI) gives guidance to the applicator both before and after shrinking.