SZAR Shrink Sleeves

SZAR Splash Zone Shrink Sleeves

     Szar (Splash Zone and Subsea Corrosion Protection for Conductor Connectors) is designed to completely seal offshore conductor connectors exposed to splash zone and subsea environments.  The installed sleeve encapsulates the connector and bonds to the conductor on either side.  The product prevents seawater from entering the connector joint and causing internal corrosion. 

     Cathodic protection is ineffective in the splash zone and on recessed areas such as the inside connectors on the subsea portions of conductors.  Effective corrosion protection for all connectors above the seabed can be achieved by using SZAR connector protection sleeves. 

     SZAR wrap around heat shrinkable sleeves are constructed of fibre reinforced, modified polyolefin.  They are precoated with a high shear strength, hot melt adhesive that chemically bonds to a two part epoxy primer.  The system provides mechanical strength and exceptional long term adhesion to steel. 

     The unique construction of the SZAR sleeve provides a tough, split resistant, low profile coating capable of withstanding the rigours of offshore installation and long term exposure to constant wave action, abrasion and impact.

     SZAR sleeves are heat shrinkable and they easily accommodate diameter differences between the conductor and connector.  Special filler strips can be provided to accommodate grooves and diameter transitions on connectors.  The filler strips soften during installation to conform to the surface of the connector and fill possible voids. 

     High performance coatings require grit blasting for effective surface preparation.  Although this can be done offshore during conductor stringing, it is much simpler to grit blast the connectors onshore and apply a coating of SZAR Epoxy Primer (S1301M).  This process will maintain the surface profile and greatly simplify offshore operations.

     To install offshore, simply preheat the connector with a propane torch to remove moisture, hand apply a second epoxy primer coating and wrap and shrink the sleeve.

Offshore Field Joint Coating

Heat Shrink Sleeves for Offshore Field Joint Coating

     Heat shrinkable sleeves have been used successfully on offshore oil and gas pipelines more many, many years.  Whether installed in a J-Lay or an S-Lay, literally hundreds of thousands of heat shrink sleeves are currently preventing corrosion on field joints in the worlds oceans, gulfs and seas.  Heat shrink sleeves have always been a reliable and easy to install option for most offshore project.  Requiring very little specialized equipment, many heat shrink sleeves can be installed on wire brushed (or power brush) pipe surfaces and many heat shrink sleeves can be installed with nothing more than a propane torch and a silicon roller.  With those simple tools and with minimal training, an easily repeatable, consistent, simple; and most importantly:  fast installation -- heat shrink sleeves are very often the most logical choice for offshore field joint coatings of subsea pipelines.

     One of the most commonly used shrink sleeve material types used on offshore pipelines is the WPC100M.  WPC stands for Wraparound Pipe Coating.  The 100M tells us that the sleeve is rated to a temperature of 100C continuous operating temperature and the M tells us that the adhesive sealant of the shrink sleeve is a mastic material (butyl mastic in this case).  WPC100M is a product that can be installed over a wire brushed pipe surface.  WPC100M also requires that the substrate be preheated to a temperature of 212F prior to wrapping and heat shrinking the sleeve.  Residual heat from the welding station can certainly be used as the supply of that preheat temperature as long as the temperature exceeds 212F while staying under 260F (the sleeve would insta-shrink if the backing were exposed to temperatures above its crystalline melt point; which is ~267F).  The sleeve is then torch shrunk in place until it conforms to all substrate surfaces and mastic flow is evident at all edges.  Installation is very quick and we have performed time trials in the past where we installed WPC100M on a 36" pipeline in less than four minutes per field joint using two installers; each with a high output propane torch.

     WPCT is another heat shrink sleeve product that has been used extensively offshore.  Very similar to the WPC100M above, WPCT can be installed over a wire brushed pipe surface.  The preheat temperature for WPCT is in the 140F range.  As you might logically have already concluded; the fact that the preheat temperature for WPCT is lower than the preheat temperature of WPC100M does indeed mean that the approved operating temperature for WPCT is lower than WPC100M.  WPCT is generally approved for use on pipelines operating at or below 104F. 

     Both WPCT and WPC100M are available in a variety of widths less than or equal to 34.25".  Standard options are 11", 17", 24" and 34", but we do have the capability to offer up custom widths for any products that we sell.  In addition, all WPCT and WPC100M sleeves that we sell are offered as /UNI sleeves.  This means that the closure strips are preattached to the shrink sleeve material here in our shop.  This makes the installers jobs even easier and removes the risk of lost closures.