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The ASME board first approved machine-room-less systems in a revision of the ASME A17.1 in 2007. Machine-room-less elevators have been available commercially since the mid-1990s, however cost and overall size prevented their adoption to the residential elevator market until around 2010.
Less than that is typically a storage tank, even if there is some overpressure added by design. The rules for PVHO are invoked at 2 psig (13.8 kPa), per Section 1-2.1 "Application" of the ASME PVHO-1 code. [2] This lower threshold is due to the potential for serious injury if a person under pressure as low as 2 psig is rapidly decompressed. [4] [5]
In the United States and Canada, new escalators must abide by ASME A17.1 standards, [47] and old/historic escalators must conform to the safety guidelines of ASME A17.3. [48] In Europe, the escalator safety code is EN 115.
The American Society of Mechanical Engineers (ASME) is an American professional association that, in its own words, "promotes the art, science, and practice of multidisciplinary engineering and allied sciences around the globe" via "continuing education, training and professional development, codes and standards, research, conferences and publications, government relations, and other forms of ...
Some of which includes the Boiler and Pressure Vessel Code (BPVC), Elevators and Escalators (A17 Series), Piping and Pipelines (B31 Series), Bioprocessing Equipment , Nuclear Facility Applications , Process Performance Test Codes (PTC), and Valves, Flanges, Fittings and Gaskets (B16).
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The ASME Boiler & Pressure Vessel Code (BPVC) is an American Society of Mechanical Engineers (ASME) standard that regulates the design and construction of boilers and pressure vessels. [1] The document is written and maintained by volunteers chosen for their technical expertise . [ 2 ]
Buildings commonly use a factor of safety of 2.0 for each structural member. The value for buildings is relatively low because the loads are well understood and most structures are redundant. Pressure vessels use 3.5 to 4.0, automobiles use 3.0, and aircraft and spacecraft use 1.2 to 4.0 depending on the application and materials. Ductile ...