Field Joint Coating for Bores

 Special Coating for Pipe Bores?

     There is a significant difference, when evaluating pipe coatings, between the performance required for a buried pipeline that will be backfilled; and a pipeline that will be dragged through a bore hole for (possibly) thousands of feet; encountering who knows what in terms of rocks, roots, clay, etc.  Bores require high performance products, otherwise your coating is likely not going to survive.

     That is illustrated in the photo above.  That is a section of pipe that was dragged through a bore.  What we are looking at here is the "back end" of the field joint coating.  The black that you see (which is kind of scraped away in places) was an epoxy coating that was being evaluated along with the DIRAX coating system.  We can see quite clearly here, that black epoxy was completely scraped away in places.  Meanwhile, the DIRAX sleeve has nothing more than some surface scratches that aren't coming within 100 mils of the bare steel protected underneath.  

     One product failed (the black epoxy product) and the DIRAX passed with flying colors.  

     In terms of products that I offer that are specifically designed to survive a bore and then protect that pipeline for the life of the pipeline; there are 3 products that I lean on:

1.  DIRAX:  more than a coating; DIRAX is a coating system.  Utilizing a two part epoxy primer as both the bonding agent and the actual anti-corrosion coating; DIRAX then adds in a thick, reinforced polyolefin backing and a very tough, very strong hot melt adhesive that bonds both chemically and physically to the epoxy bonding agent.  DIRAX is easy to install and offers unparalleled protection of the field joints on your pipeline.

2.  POWERCRETE J:  the premier and original field joint coating for bores and drills.  Powercrete J offers excellent adhesion to steel; gouge resistance and is great at every other coating parameter that would considered "important" for a bore.  Available in 2#, 4# and custom kit sizes; Powercrete J is an excellent choice.

3.  Powercrete R65/F1:  bringing many of the same excellent features as Powercrete J; Powercrete R65/F1 adds another:  FAST CURE.  Approved for bores; and requiring fewer labor dollars to install, Powercrete R65/F1 is an excellent choice for your bore.  

I'd love to discuss your next project with you.  Steve@jsicoatings.com   936/321-3333

WPCT for Road Bores?

Standard Shrink Sleeves on Road Bore Applications

     The world of pipeline coatings is much like the world of tools. Different tools are designed for different functions.  Brooms are great, and very effective when sweeping up dirt....but they are going to be pretty much useless if you're trying to cut down a tree.  Likewise an axe is great for cutting down a tree, but is not going to be particularly effective for tightening a bolt.  A wrench can tighten a bolt great, but it isn't going to be very effective if you're trying to dig a deep hole.  Likewise; standard shrink sleeves are great for basic, drop the pipe in a ditch and backfill it types of applications; but they are quite simply:  not designed for use in road bore applications. 

     WPCT is our most commonly sold ambient temperature, wrap around, heat shrink sleeve for corrosion prevention.  It is a fantastic product.  It has successfully prevented corrosion for decades on literally millions of field joints over the last decade.  It is easy to install.  It is reliable.  It essentially inspects itself.  But WPCT is not approved or recommended for use on road bore applications.  That simply isn't what it is designed for. 

     The product that is specifically designed for road bore service is our DIRAX product.  Incredible peel and shear resistance.  Unparalleled abrasion resistance and penetration resistance.  This sleeve is three times thicker than the WPCT product (on the leading edge of the coating).  DIRAX uses a two part epoxy as the primary corrosion coating.  That two part epoxy brings with it excellent cathodic disbondment resistance and improves the physical characteristics of the system (better peel / shear).  The DIRAX sleeve is then installed over the wet epoxy.  DIRAX is comprised of a three layer backing system and a high shear polyamide adhesive; which is designed to physically and chemically bond to the two part epoxy; forging a contiguous, bonded, thick field joint coating system that will easily withstand any forces it is put through during the boring process. 

     To sum up:

DIRAX for directional drilling:  GOOD

WPCT for directional drilling:  Not Good

    
     Now, there are folks out in the world who will tell you that "WPCT will do just fine on a road bore."  Please, do not believe those folks.  They are just looking to make a quick and easy sale.  They aren't evil people, they are simply uneducated.  They want things quick and easy rather than spending the time to learn the ins and the outs of the Covalence heat shrinkable products product line.