Corrosion of Insulation Jacketing - PowerPoint by bA5mrD6M

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									                 Welcome
 The objective is to provide the best
  recommendation to diminish the possibility
  of corrosion at the metal and insulation
  interface.
 Explanation on the differences between
  moisture retarder and vapor barrier.
 Show the results of corrosion tests done
  on multiple bare metals. (Galvanic Test)
 Show the results of corrosion tests done
  on multiple bare metals laminated with
  polysurlyn moisture retarder.
 Show the results of corrosion test done on
  painted moisture retarders. (Pinhole Test)
 Introduce ITW’s recommended solution.
             Terminology
 Two terms often confused

 Vapor Retarder /Barrier

 Moisture Retarder
            Vapor Retarder/
                Barrier
 Definition- A material used to prevent
  moisture vapor in the atmosphere from
  reaching the insulation on cold work.
 System operating below ambient
  temperature: vapor drive is toward the cold
  pipe and equipment
 Vapor barrier properly applied to warm
  side of insulation can minimize problems
          Moisture Retarder
 Definition- A material, usually Polysurlyn®,
  which is heat laminated to the inner
  surface of metal jacketing to keep
  moisture from contacting the metal jacket
  in order to prevent corrosion of the jacket.

 Function is really corrosion retarder.
MOISTURE RETARDER
                Moisture
 Entrapped between the insulation jacket
 and the insulation may function as weak
 electrolyte.

 This condition may set up galvanic
 corrosion

 Important to keep insulation and exterior of
 vapor retarder dry
         Job Site Conditions
 May be difficult to insure that insulation
  and vapor retarder dry before applying
  insulation jacketing

 We always recommend a Polysurlyn®
  moisture retarder. The insulation jacketing
  may come into contact with excessive
  amounts of moisture at anytime.
  Standard Moisture Retarders
 Polysurlyn® - a three layer co extruded
  film



 Paint – of different types
                 GOAL
 Provide the best recommendation to
 diminish the possible interior corrosion of
 insulation jacketing installed by you or
 your customers
  Corrosion of Insulation Jacketing
 Metal Types
   - All

 Differentiation
  - Based on user specification
  -Job Site environment
          Galvanic Corrosion
               Testing
 Test parameters

 Materials tested

 Test results
 Aluminum 3000 Series Bare




Corrosion on the inside of the unprotected
aluminum 3000 series jacket.
 Aluminum 3000 series Bare
                                   Corrosion Pits




Corrosion on the inside of the unprotected
      aluminum 3000 series jacket.
       Galvanized Steel Bare
 Removed from test early


 Zinc coating failed
       Galvanized Steel Bare




Corrosion on the inside of the galvanized steel
jacket
   Zinc/aluminum coated steel




Red corrosion on the interior of a zinc/aluminum
steel jacket.
Aluminized Steel

                   Corrosion
Aluminum 3000 series w/PSMR




 Aluminum 3000 series H14 jacket with no
 corrosion
Zinc/aluminum coated steel
         w/PSMR




Zinc/aluminum steel jacket with
Polysurlyn®
                 Conclusion
 Bare metal
 -All corrodes



 Polysurlyn®
 - No evidence of corrosion
            Pinhole Testing
 Test Parameters


 Test Results
Typical Painted Aluminum
        Jacketing
Painted Aluminum Jacketing-
       Thermoclad®
Thermoclad® Plus
Comparison
       Pin Hole Test Results
 ALL paint type moisture retarders tested
 have pin holes

 Thermoclad® Plus has no pinholes
              Conclusion


 Thermoclad® Plus offers superior interior
 protection
         Recommendations
 Polysurlyn® moisture retarder is
 recommended for all types of metal
 jacketing as best practice

 Polysurlyn® shall be 3 mil thickness, 3
 layer co-extruded film, factory heat
 laminated to metal jacketing
 ITW Insulation Systems Canada
  Aluminum Jacketing Products
 We will offer two Products:
GOOD
Aluminum with Polysurlyn Moisture
 Retarder.
Exterior: Bare Aluminum
Interior: 3 mil thickness 3 layer co-
 extruded Polysurlyn factory heat laminated
 to metal jacketing.
BEST
THERMOCLAD PLUS ®
 Exterior: 0.4 mil clear un-tinted coil coated
 thermosetting enamel.
Interior: 0.6 mil laminate grade coil coated
 thermosetting enamel covered by a 3 mil
 thickness 3 layer co-extruded polysurlyn
 factory heat laminated over the enamel
 undercoat.
FOR SPECIFICATION DATA SHEETS PLEASE VISIT
OUR WEBSITE AT WWW.ITWINSULATION.CA

								
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