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Weld-On Sight Windows for ASME Pressure Vessels
and non-ASME Applications

Jacoby-Tarbox Pressure Vessel Quality (PVQ) windows, circular and obround, are available manufactured in accordance with Section VIII of the ASME Boiler and Pressure Vessel Code.  Weld pads are a proprietary size and designed to be self-reinforcing like any other studding outlet.  Factory thicknesses work for most applications.  Custom thicknesses are available to meet your vessel designer’s requirements.  Non-ASME windows are available for lighter duty and piping applications.


  • Pads available with flat (standard), cylindrical radius cut, or spherical radius cuts

  • Weld neck body windows available for pipe ends, fittings, or vessels

  • Standard windows available to 600 psig / 41.4 bar (consult factory for higher pressures)

  • UniGlas window discs available for all weld-on sight windows

  • Standard windows available with quartz glass for service temperatures up to 2012°F / 1100°C

  • Custom sizes are available

  • Weld pad material available to match your specification

weld on sight window
W5000-2 weld on sight window
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