1 / 56

Fire Resistant Coatings

Fire Resistant Coatings. Presented by: Jayson L. Helsel, P.E. KTA-Tator, Inc. Learning Objectives. Comprehension of the Fire Resistant Webinar will enable the participant to: Describe how intumescent coatings protect underlying steel from heat exposure

Jimmy
Télécharger la présentation

Fire Resistant Coatings

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fire Resistant Coatings Presented by: Jayson L. Helsel, P.E. KTA-Tator, Inc.

  2. Learning Objectives Comprehension of the Fire Resistant Webinar will enable the participant to: • Describe how intumescent coatings protect underlying steel from heat exposure • Identify the US authority that evaluates and approves intumescent coatings • List two fire rating classification tests that are used to qualify intumescent coatings for use in building construction • Identify two primary resin types that are used to formulate intumescent coatings

  3. Learning Objectives (cont.) • List characteristics of the resin systems used to formulate intumescent coatings • Explain how steel size and structure design affect specified thickness and number of coats • Describe the methods used to improve the appearance of the texture of intumescent coatings • Describe a method to measure the hardness of the applied coating to assess cure • Identify the generic types of primer and finish coats commonly used in conjunction with intumescent coatings

  4. Fire Resistant Coatings • Sprayed Fire Resistive Materials (SFRM) are broad group of materials including: • Cementitious and gypsum based materials • Intumescent coatings (Note: There is a separate category for “Fire Retardent” coatings, which are not reviewed here)

  5. Fire Resistant Coatings • Intumescent Coatings: • Are categorized as SFRMs • Similar to conventional coatings • Have unique fire resistant properties

  6. Intumescent Coatings • How they function: • Intumescent coatings char and swell when exposed to fire/heat • The charred layer acts to insulate the steel from fire

  7. Intumescent Coatings • Performance ratings • Coatings rated by how long steel is protected at specified thickness • Ratings from 1 to 3 hours (at 30 minute intervals • Specific to shape/size of steel, e.g. W10 x 49 column

  8. Fire Resistance Classifications • Underwriters Laboratories (UL) is recognized authority that evaluates and approves intumescent coatings for a certain classification and fire rating • Certifications can be verified online at www.ul.com

  9. Fire Resistance Classifications • Certifications are “design” specific by coating manufacturer • Numbering system defines an alphanumeric design number

  10. Fire Resistance Classifications • Beams • W, M or S shaped steel sections (AISC) • Minimum beam size for fire resistance is expressed as W/D ratio • W = weight of beam per lineal foot • D = perimeter of protection material • Beams of same configuration with greater W/D ratio may be used in design

  11. Fire Resistance Classifications • Columns • Minimum column size and configuration specified in X and Y series designs • Same hourly rating applies when section with equal or greater W/D ratio is substituted for same configuration

  12. Fire Resistance Classifications • Beams and Columns • Required coating thickness increases as weight of steel decreases • Lighter steel heats up more rapidly and requires more protection

  13. Fire Resistance Classifications • Intumescent (and Mastic) Coatings • Coating thickness specification in a design is minimum average thickness measured in accordance with Technical Manual 12-B • Average thickness should not exceed maximum thickness published (if listed) in individual designs or by • No individual measurement <80% of specified design thickness

  14. Fire Resistance Classifications • Technical Manual 12-B • Published by Association of the Wall and Ceiling Industries (AWCI International) • Individual measurement = average of 3 gauge readings (similar to SSPC-PA 2) • Testing frequency one bay per floor or one test per 10,000 square feet (further defines required shapes)

  15. Fire Resistance Classifications • Technical Manual 12-B • Scope • General Information • Substrate Conditions • Site Conditions • Inspection Procedures • Method of Tests • Conditions of Finished Application • Patching

  16. Fire Resistance Classifications • ANSI/UL 263 • Used for resistance to cellulosic fire (e.g. combustion of wood or building materials) • Slower rise in temperature • 1000 F at 5 min.; 1550 F at 30 min.; 1700 F at 60 min.; 1925 F at 180 min.; 2000 F at 240 min. • Interior and exterior exposures

  17. Fire Resistance Classifications • ANSI/UL 263 Classified Coatings • Typical use for structural steel in commercial structures

  18. Fire Resistance Classifications • ANSI/UL 1709 • Used for resistance to a hydrocarbon fire • Rapid rise in temperature • 2000 F at 5 minutes • Interior and exterior exposures • Environmental tests include, accelerated aging, high humidity, salt spray, thermal cycling for exterior exposure

  19. Fire Resistance Classifications • ANSI/UL 1709 Classified Coatings • Typical use for steel structures at petrochemcial facilities, e.g. • Chemical plant • Refineries • Offshore oil platforms

  20. Other Approvals • Intumescent coatings may also need approval by city building codes • Coating manufacturers should provide approvals as applicable

  21. Generic Coating Types • Intumescent coatings are generally the following generic resin types: • Acrylic/vinyl • Epoxy • Intumescents are also generally categorized as “thin-film” or “thick-film” coatings

  22. Generic Coating Types • Acrylic/vinyl • Thin-film coating • Solvent or water-based • Single component • Typically rated under UL 263

  23. Generic Coating Types • Acrylic/vinyl • Applied in several coats • Time-frame for a complete application may span several days • Additional time may be needed before application of any required exterior finish coat.

  24. Generic Coating Types • Epoxy • Thick-film coating • Applied by plural component spray equipment in one or two coats • Rapid cure • Typically rated under UL 1709

  25. Generic Coating Types • Epoxy • May require mesh reinforcement (e.g. metal, fiberglass, carbon) • Typically requires the use of applicators licensed or approved by the coating manufacturer

  26. Generic Coating Comparison

  27. Testing for Coating Cure • Intumescents may require testing for proper cure • Typical test is Durometer Hardness (Shore D) • Resistance of coating film to indentation by Durometer instrument • ASTM D2240, “Standard Test Method for Rubber Property-Durometer Hardness”

  28. Testing for Coating Cure

  29. Coating Appearance • Intumescents generally have a rough or orange peel appearance • Methods to improve include: • Back rolling following spray application • Sanding (not recommended) • Finish coat application (may be required)

  30. Coating Systems • Intumescent design approvals typically include a primer and/or finish coat • When included in design primer/finish must be applied to meet fire rating • Primer/finish must be endorsed by intumescent coating manufacturer • Preference always for same manufacturer

  31. Use of Primers • Intumescent coating manufacturer may have approved list of primers • Types include alkyd, acrylic, epoxy and zinc-rich • Application thickness important

  32. Primers • Function of primer • Provides adhesion to substrate • Provides suitable surface for intumescent • Provides additional barrier protection • Can also provide inhibitive or sacrificial protection

  33. Use of Finish Coat • May be required in design approval for exterior exposure • Intumescent coating manufacturer must endorse finish material • Types include 100% acrylic and aliphatic urethane coatings • May affect/improve appearance

  34. Finish Coats • Function of topcoat • Color and gloss • Abrasion resistance • Chemical resistance • Washability • Resistance to the environment

More Related