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Spectacle Blind Flange

Short Description:

We assure that all products we supply are tested rigorously to each of our client’s specifications.

Extra robust corrosion protection can be supplied upon requests.

All our flanges are packaged according to an engineering or project specification.

Short delivery times can be met where required.


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Manufacturing Standards: ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, GB/T12459, GB/T13401, SH3408, SH3409, JIS B2311/2220, DIN2617/2616/2615
Size: 1/2”—100”
Pressure:    150LBS,300LBS,400LBS,600LBS,900LBS,1500LBS,2500LBS.                 DIN Standard PN-2.5,6,10,16,25,40,50,64,110,150,250,320,400.
OD: 3/8”—40”
Material: CS A105/SA105N,SS 304/3034L,316/316L
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Surface: RF,MFM,TG,RJ,RF
Carbon Steel ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70
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  • Commonly used in the following industries:
  • architecture
  • bridge
  • Petrochemical industry
  • shipbuilding
  • project
  • Offshore and onshore services
  • Power generation industry
  • Food processing industry
  • oil and gas industr
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  • Products are packaged to ensure that there is no damage during transit.
  • In case of exports, standard export packaging is done in wooden cases.
  • All pipes are marked with Grade, Lot No, Size, Degree and our trade mark.
  • On special requests we can also, make custom marking on our products.
  • Wooden Boxes
  • Wooden Pallets
  • Shrink-Wrapped
  • Carton Boxes
  • Wooden Boxes


  •  Manufacturer Test Certificate as per EN 10204 / 3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report
  •  Positive Material Identification - PMI Testing
  • Chemical Analysis - Spectro Analysis
  • Mechanical Testing Such as Tensile, Elongation, Reduction of Area
  • Micro Test
  • Macro Test
  • Hardness Test
  • Pitting Resistance Test
  • Intergranular Corrosion (IGC) Test
  • Flaring Test
  • Flattening Test
  • Hydrostatic Test
  • Hydrogen-Induced Cracking (HIC) Test, NACE TM0284
  • Sulfide Stress Corrosion Cracking (SSC), NACE TM 0177
  • Radiography Test
  • Dye Penetrant Test (DP Test)
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All materials are strictly inspected at every stage of the production process from procurement to product shipment. Visually inspect them for compliance with ASTM, ASME, MSS, DIN, EN and JIS codes and standards. Support officially certified inspection agencies to witness product material reporting, dimensional and quality compliance. Factory inspections are also supported.

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Product Description

Flange blind, also known as blind flange, real name is blind. Is a form of flange connection. In fact, there is no hole in the middle of the flange.

One of its functions is to block the end of the pipeline, and the second is to facilitate the role of removing debris in the pipeline during maintenance. In terms of blocking function, it has the same function with head and pipe cap. But the head has no way to dismantle, while the flange blind plate is fixed with bolts, which is very convenient to dismantle. Flange blind material has carbon steel, alloy steel, stainless steel, plastic, etc. Our company mainly produces metal material blind flange.

Flange blind plays the role of isolation, cut-off, and the role played by the head and pipe cap is the same. Because of its good sealing performance, for the need to completely isolate the system, generally as a reliable means of isolation. Blind plate is a solid circle with a handle, used in the usual conditions in the isolation state of the system. The 8-word blind, shaped like a figure of 8, one end is a blind, the other end is a throttle ring, but the diameter of the pipe and the pipe diameter is the same, and does not work as a throttle. 8-word blind, easy to use, need to isolate, the use of blind end, need to normal operation, the use of throttle ring end, but also can be used to fill the installation gap of the blind on the pipeline. Another feature is obvious marking, easy to recognize the installation status.

Flange blind used in oil media system is not galvanized, for other media system should be hot-dip galvanized, the minimum dipped zinc layer weight 610g/m2, hot dip zinc quality inspection according to CB * / Z343 8 is a kind of pipeline parts, mainly for easy access, the specific shape you can paint the upper part of the "8" black will know. It is half of the blind half of the iron ring. Commonly used in the need to change the process of pipeline flange, the material is mainly carbon steel, stainless steel, alloy, according to the pipeline pressure level and pipeline media to choose.

Significance of use Usually used in the pipeline with a large diameter, usually with a flange at one end of the occupation of the spacing to keep the pipeline open, when needed to change to the other end of the same thickness of the blind plate to cut off the pipeline. Avoid the temporary replacement of other blind plate caused by the pipeline is forced to expand, affecting the whole system.




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