Spectacle Blind Flange | Figure-8 Blank Flange

What is a spectacle blind flange?

A spectacle blind flange also called figure-8 blank flange,it is made of two pieces metal discs which are joint together by a part of steel handle.One piece disc of the spectacle flange is a blind without any hole on it, is could block the flow fluid when working,another piece disc is a blind which have an opening to allow the fluid run through the pipe when working.

The spectacle blind flange is a safety device used to isolate a section of pipeline or equipment when they need to be inspected or removed from piping system.It is not like a valve,the spectacle blind flange is a permanent or long term isolation block.

Stainless steel SS316 spectacle blind flange

Specifications of spectacle blind flange or figure-8 blank flange:

Size: 1/2″-24″

Standard: ANSI/ASME B16.48

Haihao Group can provide a variety spectacle blind flange(figure-8 blank flange),as follows:

• Dimensions of Class 150 Blanks for Use With Raised Face Flanges
• Dimensions of Class 300 Blanks for Use With Raised Face Flanges
• Dimensions of Class 600 Blanks for Use With Raised Face Flanges
• Dimensions of Class 900 Blanks for Use With Raised Face Flanges
• Dimensions of Class 1500 Blanks for Use With Raised Face Flanges
• Dimensions of Class 2500 Blanks for Use With Raised Face Flanges
• Dimensions of Class 150 Female Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 300 Female Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 600 Female Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 900 Female Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 1500 Female Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 2500 Female Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 150 Male Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 300 Male Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 600 Male Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 900 Male Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 1500 Male Ring-Joint Facing Figure-8 Blanks
• Dimensions of Class 2500 Male Ring-Joint Facing Figure-8 Blanks

Materials of spectacle blind flange flange:

Haihao Group manufacture spectacle blind flanges with various materials,such as carbon steel,stainless steel and alloy steel.

Carbon steel spectacle blind flange flange:

• ASTM A105 spectacle blind flange
• ASTM A350 LF2 spectacle blind flange
• SS400 spectacle blind flange
• P235GH spectacle blind flange
• P250GH spectacle blind flange
• C22.8 spectacle blind flange
• Q235 spectacle blind flange

Stainless steel spectacle blind flange:

• ASTM A182 F304 spectacle blind flange
• ASTM A182 F304L spectacle blind flange
• ASTM A182 F316 spectacle blind flange
• ASTM A182 F316L spectacle blind flange
• ASTM A182 F321 spectacle blind flange
• ASTM A182 F347 spectacle blind flange

Alloy steel spectacle blind flange:

• ASTM A694 F42 spectacle blind flange
• ASTM A694 F46 spectacle blind flange
• ASTM A694 F52 spectacle blind flange
• ASTM A694 F56 spectacle blind flange
• ASTM A694 F60 spectacle blind flange
• ASTM A694 F65 spectacle blindflange
• ASTM A694 F70 spectacle blind flange
• ASTM A182 F5 spectacle blind flange
• ASTM A182 F9 spectacle blind flange
• ASTM A182 F11 spectacle blind flange
• ASTM A182 F12 spectacle blind flange
• ASTM A182 F22 spectacle blind flange
• ASTM A182 F91 spectacle blind flange

Haihao Group is committed to providing high quality flanges and service with on–time shipments to customer. Our products are mainly for Petroleum, natural gas, petrochemical, shipbuilding, Power generation, pulp and paper industries.Haihao Group is produced strictly in accordance with the international standard of ASME/ANSI,BS,DIN,EN,JIS,GOST,UNI,ISO and specifications.We do many specials and will help you design and specify the flange that best fits your needs.Email:sales@haihaogroup.com