Sweco Fab, Inc., a division of PT&P, fabricated a variety of six spectacle blinds that will be used for selective line isolation. The spectacle blinds are fabricated from A516-70 carbon steel with sizes ranging from 4″ to 14″ diameter and per ASME B16.48 code. The function of a spectacle blind is to allow a line to be in either full shut-off mode or full flow mode, depending on which side is being utilized. Spectacle blinds are a lower cost alternative to double block and bleed valves where OSHA requires positive isolation of piping segments for safety reasons.
Piping Technology and Products, Inc. and SWECO Fab, Inc. designed and fabricated 24″ 300 # (ANSI rating), 2 1/2″ thick and 42″ 600 # (ANSI rating), 3 7/8″ thick carbon steel spectacle blinds. Spectacle blinds serve the same purpose as flow control valves at less the cost. Spectacle blinds either stop or continue the flow depending on which end is being utilized. PT&P/SWECO Fab. can supply these spectacle blinds in any material needed, such as stainless steel, Monel, Inconel and carbon steel. Smooth, mill, machined or serrated finish is also available upon request. PT&P/SWECO Fab. can produce this product in small quantities/sizes in 48 hours if needed.
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Sweco Fab, Inc. recently manufactured Spectacle Blinds ranging in size from 28" to 30" for a petroleum plant in Texas. These Spectacle (Figure 8 Blinds) are rated for 300# service, and are fabricated from SA516 carbon steel, grade 70N.
Pictured above are spectacle blinds. Piping Technology & Products, Inc. builds these for any pipe size up to 60”. A variety of metals can be used including carbon steels, stainless steels or exotic alloys depending on the pressure rating required and the environment where they must function.