Presentation on theme: "1 Chapter 2 Asbestos-Containing Materials Version 2012.1 Asbestos NESHAP Inspection and Safety Procedures Course."— Presentation transcript:
1 Chapter 2 Asbestos-Containing Materials Version 2012.1 Asbestos NESHAP Inspection and Safety Procedures Course
2 Topics Brief discussion of historical asbestos use What is asbestos?
3 History of Asbestos Use Asbestos has been used for thousands of years Principal use was in woven materials until the 1800s 1850s – First commercial production 1870s – Large deposits discovered in Canada 1940s – 1970s – Greatest use in U.S.
4 History of Asbestos Use (Cont.) More than 3,000 products have contained asbestos Asbestos products are still legally used Major ongoing challenges in managing asbestos Naturally occurring sources Naturally occurring sources Workplace Workplace
5 Geological Information What is asbestos? A naturally occurring fibrous mineral A naturally occurring fibrous mineral 6 varieties of asbestos currently regulated 6 varieties of asbestos currently regulated
6 Varieties of Asbestos ASBESTOS Serpentine GroupAmphibole Group Serpentine (Chrysotile) Cummingtonite-Grunerite (Amosite) Riebeckite (Crocidolite) Anthophyllite Actinolite-Tremolite
7 Commonly Used Asbestos Products Most commonly used ACM products in the US currently: Roofing materials (mainly flashing & cements) Roofing materials (mainly flashing & cements) Gaskets Gaskets Friction products Friction products
8 Other marketed asbestos products Asbestos-cement products Asbestos clothing Pipeline wrap (typically asphaltic) Flooring materials Caulks/putties/mastics (glues) On rare occasions banned materials like pipe insulation are imported and installed
10 Where is Asbestos Found? Naturally occurring fibrous mineral Mined from the ground like coal or iron ore Was once mined all over the world, including the US, Australia, Canada, China, South Africa, and the former USSR No longer mined in the US Still mined in Canada, China, and a number African countries
15 Chrysotile - most common - white Amosite - less common - brown Crocidolite - rare - blue Other types - remolite, actinolite, anthophyllite are sometimes found as contaminants with other minerals such as talc and vermiculite Chrysotile - most common - white Amosite - less common - brown Crocidolite - rare - blue Other types - remolite, actinolite, anthophyllite are sometimes found as contaminants with other minerals such as talc and vermiculite Asbestos Types
19 Vermiculite – Libby, Montana Source: U.S. Geological Survey and U.S. Environmental Protection Agency, Region 8, Denver, Colorado. Tremolite Fibers Winchite/Richterite
20 Asbestos Material Categories Asbestos Containing Material (ACM) >1% Surfacing Materials (SM) such as fireproofing or decorative textured ceilings Thermal System Insulation (TSI) such as pipe and boiler insulation Miscellaneous (Misc.)
21 Misc. Asbestos Materials Floor tile and mastics Ceiling tiles Roofing materials like shingles and tar Wallboard joint compound Gaskets and valve packing materials Cement asbestos products including Transite
22 Friable ACM Material that, when dry, may be crumbled, pulverized or reduced to powder by hand pressure Includes damaged non-friable material or non-friable material that is not kept substantially intact (OSHA) Includes damaged non-friable material or non-friable material that is not kept substantially intact (OSHA)
24 But when damaged like you see in the picture it can be very friable and release asbestos. Floor tile is considered non- friable.
25 Asbestos is a concern when it becomes airborne. Fibers do not just jump off materials that contain asbestos. They get into the air when ACM or ACM debris is disturbed. They may then be breathed or swallowed.
26 Surfacing material (SM) Material that is spray- or trowel-applied, generally to ceilings and structural steel Material that is spray- or trowel-applied, generally to ceilings and structural steel
30 Significant damage on a high school gym ceiling
31 ACM Acoustical Textured Ceiling in Good Condition
32 Modern non-ACM fireproofing looks much like ACM. Looks can be deceiving!
33 Thermal System Insulation (TSI) Insulation materials on systems such as: boilers/steam delivery boilers/steam delivery chilled water chilled water condensate returns condensate returns ductwork ductwork
34 Undamaged TSI If undamaged.. EPA and OSHA allow TSI to be managed in place