Spectacle Blind Flange

Spectacle Blind Flange– also known as a figure-8 blind – is generally a piece of metal that is cut to fit between two pipe flange 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 piping systems. 

ATT's spectacle blinds are a single piece of machined metal designed to eliminate the hassle of having seperate paddle blind and spacer sets. When a section of your pipe needs to be isolated from the rest for maintenance, a spectacle blind or spec blind can make the process much easier!

Size in Inch

Integral flange(Long Weld Neck Flange):3/4″-80″ DN20-DN2000

Pressure

America Series:Class 150 ,Class 300, Class 600, Class 900A ,Class 1500,Class 2500.

Europe Series:PN2.5,PN6,PN10,PN16,PN25,PN40,PN63,PN100,PN160,PN250,PN320,PN400

Flange Facing Types

America Series:Flat face(FF),Raised face(RF),Tongue(T),Groove(G),Female(F),Male(M),Ring type joints face(RJ/RTJ)

Europe Series:Type A(Flat Face),Type B(Raised Face),Type C(Tongue),Type D(Groove),Type E(Spigot),Type F(Recess),Type G(O-Ring Spigot),Type H(O-Ring Groove)

1. Materials:

Carbon Steel: ASTM A105, ASTM A350 LF1, LF2, LF3, A36, 16Mn, etc

Stainless Steel: ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Alloy Steel: A182 F1, F5, F9, F11, F12, 22, F22, F91, etc 

Duplex Stainless Steel: ASTM A 182 – F51, F53, F55, S31803, S32205, S32550, S31254, SMO254, S32750, S32760, S32950.

Copper Alloy Steel: ASTM / ASME SB 111 UNS NO. C 10100, C 10200, C 10300, C 10800, C 12000, C 12200, C 70600, C 71500, ASTM / ASME SB 466 UNS NO. C 70600 ( CU -NI- 90/10), C 71500 ( CU -NI- 70/30)

Nickel Alloy: ASTM / ASME SB 336, ASTM / ASME SB 564 / 160 / 163 / 472, UNS 2200 (NICKEL 200), UNS 2201 (NICKEL 201 ), UNS 4400 (MONEL 400 ), UNS 8020 ( ALLOY 20 / 20 CB 3 ), UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600 ), UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276)

2. Standards:

ASME ANSI B16. 5, ASME ANSI B16. 47. API 605, API 6L. MSS SP 44 CSA Z245. 12 EN1092-1, EN1759-1. DIN28115

BS1560, BS 4504, BS 10. AFNOR NF E29-200-1 ISO7005-1  AS2129  JIS B2220  UNI 2276. UNI 2277. UNI 2278. UNI 6089. UNI 6090