1.1 This practice covers the basic apparatus and procedures required to create and maintain a simulated environment intended to reproduce a sewer headspace environment. 1.2 This apparatus is designed to simulate the pertinent attributes of a typical domestic severe wastewater headspace (sewer) environment. The testing chamber comprises two phases: (1) a liquid phase containing a prescribed acid and saline solution and (2) a vapor phase consisting of air, humidity, and concentrated sewer gas (see NOTE 1). The temperature of the test chamber is elevated to create accelerated conditions and reaction rates. NOTE 1-For the purposes of this practice, sewer gas is composed of hydrogen sulfide, carbon dioxide, and methane gases. 1.3 WARNING--This practice can be extremely hazardous. All necessary precautions need to be taken when working with sewer gas, sulfuric acid, and a glass tank. It is highly recommended that a professional testing laboratory experienced in testing with hydrogen sulfide, carbon dioxide, and methane gases perform this practice. 1.4 The values stated in SI units are to be regarded as the standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate health and safety practices and determine the applicability of regulatory limitations prior to use.
Todays sewerage systems have become more corrosive in terms of their elevated sewer gas concentrations. High-performance protective coatings (namely, protective linings) are routinely observed failing in these severe headspace environments found in nearly all domestic wastewater collection and treatment systems. Protective coating failures are attributed to many factors, including the permeability to sewer gases present. Although certain chemical and physical properties of coating systems can be determined in the laboratory using current ASTM test methods, these results are not predictive of a polymers performance when exposed to severe wastewater headspaces environments. Subsequently, the wastewater sector is faced with selecting from an array of protective coatings that have not been subjected to a testing environment simulating that found in actual sewer systems, in large part because of the lack of a standardized laboratory testing method.
wastewater test chamber; severe wastewater analysis test; accelerated testing; sewer testing; hydrogen sulfide gas; biogenic sulfide corrosion; sewer corrosion; protective coatings; protective linings; wastewater gases; sewer gases
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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