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The ASC Engineered Solutions 312820400 is a FIG 832 Pipe Dart Union designed for threaded pipe assemblies in commercial and industrial piping systems. Built from malleable iron with a black oxide finish, this union provides a reliable, separable joint in 1-1/2 inch nominal pipe runs. It carries a 300 lb pressure class and is rated to 600 psi, making it suitable for moderate- to high-pressure applications. The fitting measures 3 inches in length with a 4-inch hex and a 2-3/16 inch diameter. Conforming to ASME B16.39 for malleable iron unions and ASME B16.3 for malleable iron fittings, it meets the dimensional and performance standards expected by licensed pipefitters and mechanical contractors.
This union is well suited for use in black iron pipe systems found in gas distribution, steam, compressed air, and general industrial fluid service. It is installed in residential and light commercial settings by licensed plumbers and pipefitters, as well as in industrial plant piping by mechanical contractors. The FNPT end style accepts standard tapered pipe threads, making it compatible with conventional threaded pipe work. The domestic manufacture designation indicates the fitting is produced in the United States, which is relevant for projects with domestic content requirements.
Designed as an OEM-style replacement or new-installation fitting for 1-1/2 inch nominal threaded pipe systems conforming to ASME B16.3 and ASME B16.39 standards.
Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local mechanical and plumbing codes. Depressurize and isolate the pipe section completely before removing or installing any union. Apply an appropriate thread sealant or PTFE tape to all male threads before assembly. Do not exceed the rated 600 psi working pressure or the -20 to 150 degrees F temperature range for the intended service.
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