Covalence® has over 40 years of experience in the development and manufacture of heat-shrinkable products.
Continuous improvement ensures state-of-the-art performance. Approval by testing 
agencies around the world guarantees suitability for individual applications and field conditions.

Covalence® heat shrink force technologies provide strong mechanical strength performance and corrosion protection for oil, gas and water transmission pipelines.

 

COVALENCE CORROSION PROTECTION PRODUCTS


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
  diameters

- Mastic-coated sleeves balance performance, economy and ease
  of installation

- 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
  directional drilling

Dimpled backing providing a patented “permanent change”
  indicator for application of heat.


Installation

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.

HTLP-80

WPC-C30

DIRAX

MEPS

CSEM-F

TPSM

PE
MELT STICK

PERP PE

S1301-M
E-PRIMER