Spectacle Blind Flange or Figure 8 Flanges

1.WHAT ARE SPECTACLE BLIND FLANGES?

An Spectacle Blind Flange resembles like a pair of glasses; two metal discs are joined together by a section of metal to form the flange. These flanges are also called as figure 8 flanges. The primary role of  Carbon Steel Spectacle Blind Flanges are pressure retaining plates used in high pressure piping networks. Our ASME B16.5 Spectacle Blind Flanges can be easily rotated to open and close the flow from pipes. They are used in applications that operate at sub-zero temperatures, are volatile and toxic.

OEM/ODM order accepted, standard or no-standard steel Spectacle Blind flanges in various specifications and standard materials can be manufactured according to customers’ requirements.

Spectacle Blind Flanges or Figure 8 Blind Flanges

SPECTACLE BLIND FLANGES

Spectacle Blind Flanges

2.Standard Specification For Spectacle Blind Flanges

Dimensions : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings

ASME Size : 1/2"  to 48"

DIN:DN15 TO DN1200

EN 1092-1

DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673

BS : BS4504 , BS4504, BS1560, BS10
JIS B2220

KS B 6216 

3.Surface Treatment: Anti-rust Oil, Transparent/Black Anti-rust Paint/Hot dipped Galvanized.

4.Spectacle Blind Flange Pressure Grade
Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS,
DIN Standard PN6,10, 16, 25, 40 ,64,100,250,320,400.
JIS B2220:5K、10K、16K、20K、30K、40K,63K.

5.Material & Grades of Spectacle Blind Flanges :

Carbon Steels:A516 Gr.70 ANTI-HIC, A694 F52 / F60 / F65 / F70, A105, SA-266M, 20#, 16Mn, 16MnHIC, 20#HIC, and equivalents.

Alloy Steels:SA182-F11, SA182-F22, 15CrMo, 20MnMoNb, 25Cr2MoVA, 14Cr1Mo, 12Cr2Mo1, 08Cr2AlMo, 12Cr5Mo, 38CrMoAl, 20MnNiMo, SA-508 Gr.3, and equivalents.

Low-Temperature Steels:SA350 LF1 / LF2 / LF3, 09MnNiD, 16MnD, 20MnMoD, 08Ni3D, 10NiMoVD, and equivalents.

Stainless Steels:F304 / 304L / 304H (1.4306), F316 / 316L / 316H (1.4404), F321 (1.4541), 316Ti (1.4571), F347 / F347H (1.4550), F317 (1.4449), F310 (1.4845), F904L (S39042 / 1.4539), X2CrNiMo25-22-2, SA-182M F310MoLN, A182 F6NM, A182 F6a, and equivalents.

Duplex & Super Duplex Stainless Steels:S31803 (2205), F51 (S22253), F60 (S22053 / 2205), F53 (S25073 / 2207), and equivalents.

6.Sealing Surface Types For Spectacle Blind Flange 

RF (Raised Face);              EN 1092-1 Type B
FF (Flat Face);                 EN 1092-1 Type A
RTJ (Ring-Type Joint)           EN 1092-1  Type E

7.ANSI B16.5 Spectacle Blind Flanges Application

ASME B16.5 Spectacle Blind Flanges are known to deliver exceptional performance and are generally developed for meeting the demands. We offer a broad range of Spectacle Blind Flanges. These Spectacle Blind Flange is use in various industries.

Related Reading:

WN WELD NECK FLANGES

SO SLIP-ON FLANGES

TH THREADED FLANGES

SW SOCKET WELD FLANGES

BL BLIND FLANGES

LJ LAP JOINT FLANGES

LWN LONG WELD NECK FLANGES

SPECTACLE BLIND FLANGES

REDUCING FLANGES AND EXPANDER FLANGES