It is the responsibility of the purchaser to determine which grade shall be furnished depending on design and service conditions, mechanical properties, and corrosion-resistant characteristics. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents. Learn more about the cookies we use and how to change your settings.
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A valve company took exception, and indicated that duplex valve bodies and bonnets would be supplied per ASTM A What is the difference between these specifications? As such, many piping specifications include references to ASTM A and its various duplex grades for piping components such as valves.
ASTM A lists tensile property requirements, but does not require that the tensile tests actually be performed. Tensile tests are only required if Supplementary Requirement S32 is specified on the purchase order. In order to obtain a test report showing the actual chemistry and tensile test results, Supplementary Requirement S12 must also be imposed.
Marking of heat numbers on castings is not required unless specified separately on the purchase order. Any casting that meets A also meets A However, A imposes some additional requirements:.
ASTM A was reapproved without changes in However, one thing is clear-materials are not added in these codes unless the parent specification requires tensile testing to ensure that the product being supplied actually meets the minimum mechanical properties upon which the design is based.
For this reason alone, many specifications that don't require actual tensile testing are not represented in these codes. A grades will not be added for the same reason. Looking for a career in the Valve Industry? Renewable Energy Consumption Surpasses C. Latest Web Only. Sections New! Industry 4. Latest Articles. Latest Products. Post: 01 June Upcoming Valve Industry Events Reprints. Secret Key. Remember Me. A does not. A provides a definition for major weld repairs and requires post-weld heat treatment i.
A only requires post-weld heat treatment if Supplementary Requirement S33 is imposed on the purchase order. A imposes several other requirements that are not included in A nor A Each heat of material must be tensile tested.
Each casting must be hydrostatically tested. Each casting must be marked with a heat number or with a serial number traceable to a heat number. Certification must be provided listing the chemical analysis of the heat and the mechanical property test results.
Mechanical properties vs. Latest Post Popular Links Events. Visit VMA. Emerson: Virtual Valve Repair Service.
ASTM A890/A890M - 18a