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ASTM grain size is a property written into many specifications for metals, with finer grain sizes generally indicating better mechanical properties, such as formability. While measuring certain materials for such properties can be difficult, electron backscatter diffraction can provide precise determinations as well as give information on grain size distribution and statistics. A new ASTM…
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ASTM International Committee F17 on Plastic Piping Systems has just completed the development of two new standards for polypropylene sanitary sewer pipe. These new standards are the first to address both dual wall and triple wall profile designs. “Polypropylene has unique material characteristics, which make it ideal for sanitary sewer pipe applications,” says John Kurdziel, director, technical…
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A recent revision to ASTM International standard E384 , Test Method for Knoop and Vickers Hardness of Materials, expands the range of its coverage. The standard is under the jurisdiction of Subcommittee E04.05 on Microindentation Hardness Testing, part of ASTM International Committee E04 on Metallography. The revision incorporates ASTM E92 , Test Method for Vickers Hardness of Metallic Materials…
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A newly approved ASTM International standard provides a procedure for safely conducting leakage tests of polyethylene pressure piping systems with compressed gaseous testing media. The new standard, ASTM F2786 , Practice for Field Leak Testing of Polyethylene (PE) Pressure Piping Systems Using Gaseous Media Under Pressure (Pneumatic Leak Testing), was developed by Subcommittee F17.40 on Test…
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A proposed new ASTM International standard will allow gas utility companies to better identify underground assets, such as different types of pipe, fittings and components. From an operations perspective, effective identification is a critical component, ranging from asset management to risk management and mitigation, to help facilitate compliance with the recent Distribution Integrity Management…
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Those involved in the rehabilitation of pressurized piping systems are invited to participate in the development of a proposed new standard, ASTM WK24231 , Practice/Guide for Internal Pipe Epoxy Barrier Coating Material Used in Pressurized Piping Systems. The proposed standard is being developed by Subcommittee F17.67 on Trenchless Plastic Pipeline Technology, part of ASTM International Committee…
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ASTM International Committee F17 on Plastic Piping Systems is currently developing an efficient means to standardize fabricated polyvinyl chloride pressure fittings that are used in a variety of piping applications. The proposed new standard, WK23931 , Specification for Fabricated PVC Pressure Fittings, is under the jurisdiction of Subcommittee F17.10 on Fittings. Some of the applications that…
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ASTM International Committee F37 on Light Sport Aircraft is currently at work on a proposed new standard that will aid light sport aircraft manufacturers in understanding the standardization system that governs their products. ASTM WK22124 , Guide for Compliance with Light Sport Airplane Standards, is under the jurisdiction of the F37.20 Airplane subcommittee. According to Thomas Gunnarson, U.S.…
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ASTM International Committee F37 on Light Sport Aircraft will meet March 30 to April 1, 2009, at the Messe Friedrichshafen Exhibition Grounds in Friedrichshafen, Germany, in conjunction with AERO Friedrichshafen 2009. The three days of F37 technical meetings will include discussions on changes to key LSA standards and proposals for new documents. It will also include several other activities,…
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Thermoplastic corrugated stormwater chambers are similar to other types of plastic piping systems in that they are subjected to significant live loads from surface traffic as well as dead loads from earth cover. However, differences in construction — specifically, the fact that chambers are open-bottomed arches — necessitate an understanding of how corrugated stormwater chambers behave…