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Thursday, January 2, 2014

WPC Installation Instructions

Wraparound pipe sleeve for field corrosion protection


Wraparound Pipe Sleeve for Field Girthweld Corrosion Protection

WPC heat-shrinkable wraparound sleeves are designed for corrosion protection of girthwelds on buried pipelines.

WPC sleeves have a thick radiation-crosslinked polyolefin backing coated with a specially formulated mastic sealant. During installation the mastic flows and fills surface irregularities, bonding to metal and adjacent coating surfaces. The flexible closure is coated with a high shear-strength adhesive and is kitted with the sleeve; however,  it is available pre-attached to the sleeve in the UNISLEEVE construction.

Simple Installation                                                         Resists Adverse Environments
To install, wrap the sleeve around a clean,                                                WPC sleeves resist hydrostatic pressure.           
preheated pipe. A flexible closure forms the                                            They demonstrate high resistance to
sleeve into a tube. The sleeve is then torch-                                             ultraviolet light, fungus, bacteria, cathodic
shrunk around the pipe.                                                                             disbondment and chemical attack by
                                                                                                                    common fluids and solvents.

Rugged and Mechanically Strong                                               Versatile
WPC sleeves resist abrasion, impact and                                                     WPC sleeves are compatible with all
 penetration. No rock-shield is required                                                    standard pipe coatings and outer jackets
                                                                                        including fusion-bonded epoxy, polyethylene,
                                                                                                                     tape and coal tar. The product has a long
                                                                                                                     shelf-life when stored correctly at tempera-
                                                                                                                     tures below 50 degrees C

Materials and equipment
  1. Appropriate size WPC sleeve and WPCP IV closure patch
  2. Raychem torch (or equivalent)
  3. Propane gas tank, hose, regulator and gauge
  4. Standard safety equipment such as gloves, goggles, hard hat, etc.
* Installation has to be done according to local government regulations and usual safety precautions. 

Sleeve Application

1. Clean exposed steel and adjacent pipe                      
coating to be covered by WPC sleeve with a
hand or power wire brush, to remove loose
and foreign materials. Wiping may be
necessary to remove the particles from
Preparing the pipe for WPC applicationNote:
Coal tar - remove outer paper wrap 5" (125
mm) to 6" (150 mm) adjacent to cut-back to
expose coal tar.
 Painted coatings - remove whitewash paint
on the surface of coating to be covered by
WPC sleeve.

2. Preheat joint area until approximately
140 degrees F (60 degrees C) minimum and check for 
conformance either by temperature gauge or other temperature
measuring device. Preheating reduces installation time
and ensures proper bonding.
preheat the joint area preparing of sleeve application
Two people working on opposite sides of
the pipe are recommended for installing 
sleeves on pipe 16" (400 mm) in diameter
and larger.

3. Remove the protective release plastic from the
coated sleeve. Center sleeve over the weld so it is
evenly overlapping adjacent pipe coating. Wrap 
loosely around pipe so that the Raychem logo runs
around the pipe.
sleeve application over preheated joint, remove protective release
1) Clean over lap area of the sleeve to remove
dirt and other foreign material.
2) Edges of sleeve should extend 2" or more
onto adjacent pipe coating.
3) Overlapping ends of sleeve should align evenly.
4)Position overlap to permit easy access for installing closure.


WPCP IV Closure Application

1. Press WPCP IV closure in position, centering over the exposed
         sheet end.(For UNI-sleeve products, the closure is pre-attached 
  and already centered in position.)The sheet should overlap the 
sheet (excluding closure) by 2" (50 mm) minimum. 

Joint Specialist already provides the closure pre-attached read for install

2. Using a Raychem torch (or equivalent), adjust flame length to 
approximately 20" (500 mm) to produce a blue tipped yellow
flame.Using the yellow portion of the flame, heat the closure 
evenly until the pattern of the fabric reinforcement is visible. 

Heat closure with flame, closure application, smooth wrinkles

With gloved hand, pat down the closure and smooth any wrinkles by gently
working them outward from the center of the closure.


Sleeve Recovery

1. Using the Raychem torch (or equivalent),
begin at the center of the sleeve and heat
circumferentially around the pipe using a
constant paintbrush motion.

center sleeve, heat circumferentially, smooth surface

2. Continue heating toward one end of the
sleeve, followed by the other.

continue heatingNote:
Sleeve may be recovered starting at one end
and proceeding toward the opposite end,
depending on conditions (i.e., wind).

3. During shrinkdown, occasionally check
adhesive flow with a finger. Wrinkles should
disappear automatically. Remember to wear

remove air void, sleeve recovery
While sleeve is hot, press roll overlap and
closure area to remove any air voids.

4. Sleeve is fully recovered when all of the
following have occured:
WPC sheet, smooth surface, weld bead profile, conformed to pipe

1) There are no cold spots or dimples on the sleeve surface.

2) Weld bead profile can be seen through the sleeve.

3) After sleeve is cool, mastic flow is evident on both edges.

4) The sleeve has fully conformed to the pipe and adjacent coating.

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