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Sep 26, 2020 · The Pittsburgh seam is used for pressure classes and duct sizes larger than the Snap Lock seam can handle. The Pittsburgh seam comes in small and large sizes depending on the pressure requirements of the ductwork.
Learn how to join sheet metal with various methods, such as grooved seams, cap strip seams, drive slip joints, and "S" joints. The web page does not mention pittsburgh lock seam, which is a type of lap seam with a curved edge.
Seam lockers are used to lock Pittsburgh seams, angle seams, and standing seams. TRUMPF seam lockers close folds on ventilation ducts in a roll/glide process. The seam locker machines automatically adjust to the thickness of the sheet.
Apr 6, 2022 · If the shop uses Pittsburgh as their only longitudinal lockseam—for their straight duct and their fittings—investing in a durable and fast free standing pittsburgh machine is vital and going “Small Pittsburgh” is the best option. The Small Pitts uses 1″ of material and is good from 26 gauge down to 20 gauge.
Jun 30, 2023 · A Pittsburgh lock forming machine is designed to create the signature Pittsburgh lock seam, a reliable and efficient method of joining ductwork. It works by transforming flat pieces of sheet metal into folded, interlocking seams, resulting in airtight joints that prevent air leakage.
Aug 22, 2024 · Also known as a Pittsburgh lock or Pittsburgh seam, Pittsburgh joints occur longitudinally along the duct—that is, the long way down, not the short way across. These are less of a joint holding multiple ducts together, and more part of the way each individual duct is constructed.
The Pittsburgh lock seam is the ideal seam joint for connecting straight or curved sheetmetal parts with pre-formed edges. Pittsburgh lock seams provide smooth and aesthetic connections without the need for additional fastening elements.
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