heat shrink sleeves - aucsc speaker files/coatings period 3 aucsc 2012... · heat shrink sleeves ....
TRANSCRIPT
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• Specification
• Surface Prep
• Application
• Quality Control
May 15, 2012
Jack Wink UMAC, Inc
Heat Shrink Sleeves
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Prevent corrosion !
Coatings need to have
• high electrical
resistance
• low permeability to
hydrogen and oxygen
• mechanical strength
• chemical stability
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Irradiation Cross-linking
• High energy electrons are used to strike the molecules at the CH bond
• The hydrogen atom is set free leaving the parent carbon atom as a “free radical”
• At adjacent sites, the free radicals use their energy to form a chemical bond
• This bond is called a cross-link
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Polyolefin
(before)
Irradiation
processing
Cross-linked Polyolefin (after)
Polyolefin Cross-linking
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Properties of Cross-linked
Backings
• Imparts Elastic Memory
• Increases Tensile Strength
• Increases Impact Resistance
• Increases Abrasion Resistance
• Increases Insulation Value
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General Design Criteria
• Ultimate performance dependent upon
installation and surface preparation.
• Installation is typically more critical with
more demanding performance in service.
• Ideal shrink sleeve can be installed in the
harshest of climates by unskilled labor and
is insensitive to pipe surface contamination.
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Heat-Shrinkable Sleeve System
• Sleeves consist of a backing and adhesive
• The backing needs to be cross-linked in order to
be heat shrinkable
• The adhesive has several functions:
– corrosion protection, shear resistance, long term
adhesion to the steel, bond to the coating…
• Design of the backing and adhesive dictates
performance at operating temperature
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Cross-linked backing
Adhesive bonds to
cutback and coating
Must be compatible with the
mainline coating
Optional epoxy
primer Pre-attached or separate
closure
Heat-Shrinkable Sleeve System
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Polyolefin Support
• Provides the mechanical protection while
assisting in the bonding the adhesive with
hoop stresses provided by the elastic
memory.
• Must withstand excessive heat without
splitting, melting or pinholing.
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Polyolefin Support
• Must withstand punishment of laying
operation.
• Will be flexible in cold climates yet tough
in hot, tropical climates.
• In above ground service, must avoid
degradation by U.V.
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Adhesive
• Must be sensitive to surface preparation and preheating limitations.
• Provide an effective bond to steel.
• Must bond to the adjacent coating, critical to know coating compatibility.
• Provide good cathodic disbondment resistance.
• Resist soil stress and pipe movement.
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Selecting the sleeve
• Pipe operating temperature
• Pipe coating type
• Cutback distance
• Outside pipe diameter
• Adverse soil conditions
• Pipe laying method
• Climate conditions
• Recommended pipe preparation
• Mechanical resistance class
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Hot Melts vs. Mastics
• Precise melt point, preheat temperature is critical.
• Anchor pattern and surface preparation are critical.
• Ensure that higher preheat temperature does not damage main line coating.
• Mastics more forgiving in
the field under extreme
conditions.
• Tackiness and pressure
sensitive nature of mastics
allow for good
performance with less
than perfect surface
preparation.
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What is important to install?
• Suitable surface preparation
• Use of the proper tools
• Primer application (if used)
• Achieve the correct pre-heat
• Sleeve centered on the cutback
• Correct overlap to the coating
• Closure properly installation
• Correct procedure for shrinking
• Visual Inspection
• Field Peel Test
• Holiday Detection
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Wraparound 2 Layer Sleeve
• Installation directly
on cleaned and dried
pipe surface
• Compatible with
standard commercial
mill-applied coatings
• No primer required
heat-shrinkable backing
hotmelt/mastic layer
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Preheat Surface Area
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Center & Loosely Wrap Sleeve around Joint
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Applying one end of Sleeve
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Flash adhesive & bring up other half of sleeve
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Secure closure strip by heating
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Start shrinking at the weld bead, 360 degrees around
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Shrink from center to one end, 360 degrees
Permanent Change
Indicator: dimples are
gone after proper heating.
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Wraparound 3 Layer Sleeve
• Epoxy first layer for superior bonding and chemical resistance
• Resist high soil shear forces
• Superior cathodic disbondment
• Superior high temp. performance
• Low preheat requirements
Three-layer coating for pipes with ambient and elevated operating temperature
heat-shrinkable backing
hotmelt/mastic layer
epoxy primer
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Sleeve Application Summary
Sleeve Type Surface Prep Preheat
Mastic Wire Brush 140°F
3 Layer (Hot
Melt)
Blast to white
metal finish
160°F
Hot Melt Blast to white
metal finish
240°F +
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Coatings of fittings
Bends
Heat Shrink Tape
• Highly flexible, hand
installed tape
• Minimal inventory
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Tubular Heat Shrink Sleeves
• Only handbrush or wirebrush
required
• No closure patch, easy to
install
• High impact strength and
penetration resistance
• Thermal indicator (TPS)
Two-layer coating for pipes with ambient operating temperature up to 30°C (86°F)
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Shrink Sleeves for casings /
flanges
• Fiberglass reinforced:
mechanical strength, high
impact strength, high
penetration resistance
• Convenient wraparound
design
• High shrink ratio (65%)
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Special applications
Extremely high shear and peel
strength
• Fiber-reinforced sleeve,
excellent abrasion resistance
• No 'curing time' - just cool and
use immediately
• Superior cathodic disbondment
• Simple installation without
special tools
Three-layer coating for horizontal or directional drilling