A spectacle blind also known as a figure 8 blind is generally a piece of metal that is cut to fit between two pipe flanges and usually sandwiched between two gaskets. A spectacle blind is often made from two metal discs that are attached to each other by a small section of steel. The shape is similar to a pair of glasses or spectacles hence the name spectacle blind. One end of the blind will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance. They are generally installed as a permanent device to separate process pipe system.
Spectacle flanges, single blinds, and ring spacer are crucial pipeline accessories when a section of the pipeline may need to be isolated from the rest. Single Blinds or Blanks are positive shut-off devices that prevent flow through a pipeline.
The products are according to the requirements of API 590 can be used to the RF flange as following standard: ANSI B16.5, SH3406, ISO7005-1, GB9112-9124, HG20615. The corrosive capacity is involved in the thickness of paddle blind, spacer and figure 8 & the corrosive capacity is 1.3mm for c.s. Low alloy & low temperature steel and O for s.s. Adopted to flat spacer. Adjust the thickness if adopt other spacer.
The industrial processes come into die forging,and machining,we can provide a wide range of flanges,following on standards like ASME B16.5 Flange , ASME B16.47 Flange, DIN 2573 Slip On Flange, DIN 2631 Welding Neck flange, JIS Flange 5K SOP Flange and JIS Flange 10K SOH Flange.
ASME Flange include ASME B16.5 Flange, ASME B16.47-A Flange, ASME B16.47-B Flange, this standard system include slip on flange, blind flange, welded neck flange, Threaded Flange, lapped joint flange (loose flange), socket welded flange, B16.36 Orifice Flange, long Weld Neck Flange and Special Flange, sizes from 1/2 inch to 60 inch, class 150, class 300, class 600, class 900, class 1500, class 2500.
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