Stainless Steel Pipe Fittings

The Blind Flanges By

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The Blind Flanges By

The blind flanges are used to close ends of piping systems. It is a kind of round plate with no center hold but with all the proper bolt holes. This blind flange is available in various sizes and materials and is used to provide positive closer on the ends of pipes, valves or equipment nozzles. This flange helps in easy access to a line once it has been sealed. The blind flange is sometimes custom made or machined to accept a nominal sized pipe to which reduction is being made. This reduction can be a threaded reduction or welded reduction.

Grades :

•   F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L Duplex stainless steel UNS S31803, 2205, Super Duplex stainless steel UNS S32750


•   Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500 
Features of blind flanges:

Some important features of blind flanges are as follows:

•   Blind flanges are sometimes supplied with NPT fittings which allow pressure test connections to be fitted.
•   They are used to blank off the ends of pipe.
•   They are also used to blank off the ends of valves and pressure vessel opening.
•   Considering factors like internal pressure and bolt loading, blind flanges, especially in the larger sizes, are the most highly stressed of all types of flanges.
•   Since the maximum stresses in a blind flange are bending stresses at the center, they can safely be allowed to be higher than in other types of flanges.
•   Blind flanges are made to fit standard pipes in all sizes. 

Notes :

•   Flange dimensions to ANSI to B16.5.
•   Dimensions “D” includes raised face thickness. 
•   Larger outlet sizes available on applications.
•   ANSI 150# / 300# 2mm Raised Face.
•   ANSI 600# / 2500# 7mm Raised Face.

Materials :
Nickel Alloy Blind Flanges 

• ASTM / ASME SB 564 / 160 / 472 
• UNS 10276 (HASTELLOY C 276 Blind Flanges)
• UNS 2200 (NICKEL 200 Blind Flanges)
• UNS 2201 (NICKEL 201 Blind Flanges)
• UNS 4400 (MONEL 400 Blind Flanges)
• UNS 8020 (ALLOY 20 Blind Flanges)
• UNS 8825 INCONEL 825 Blind Flanges)
• UNS 6600 (INCONEL 600 Blind Flanges)
• UNS 6601 (INCONEL 601 Blind Flanges)
• UNS 6625 (INCONEL 625 Blind Flanges)

Copper Alloy Blind Flanges
ASTM / ASME SB 61 / 62 / 151 / 152.
C 70600 (CU -NI- 90/10) – Cupro Nickel Blind Flanges 
C 71500 (CU -NI- 70/30) – Copper Nickel Blind Flanges
UNS NO. C 92200, UNS NO. C 83600, UNS NO. UNS NO C 10100,
C 10200, C 10300, C 10800, C 12000, C 12200

Duplex Stainless Steel Blind Flanges
ASTM / ASME A/SA 182 UNS F 44, F 45, F51, F 53, F 55, F 60, F 61.

Alloy Steel Blind Flanges – AS Blind Flanges
ASTM SA 182 F1/F5/F9/F11/F22/F91

Carbon Steel Blind Flanges – CS Blind Flanges 
ASTMA 105 Gr. F42/46/52/56/60/65/70

Low Temperature Carbon Steel Blind Flanges – LTCS Blind Flanges
A350 LF2/A350 LF3

Value Added Services
• Hot Dip Galvanizing • Electro polish

Test Certificate
Mill Test Certificate as per EN 10204 / 3.1B

Duplex Stainless Steel : Duplex Stainless Steel Blind Flanges – Duplex SS Blind Flanges 
ASTM A 182 – Blind Flanges
F 51 UNS S31803 Blind Flanges
S32750 Blind Flanges
S31500 Blind Flanges
ASTM / ASME A/SA 182 UNS Blind Flanges
F 44 Blind Flanges
F 45 Blind Flanges
F51 Blind Flanges
F 53 Blind Flanges
F 55 Blind Flanges
F 60 Blind Flanges
F 61 Blind Flanges
Carbon Steel Blind Flanges – CS Blind Flanges 

ASTM A105 Blind Flanges
ASTM A 694-F42 Blind Flanges
F46 Blind Flanges
F52 Blind Flanges
F60 Blind Flanges
F65 Blind Flanges
F70 Blind Flanges

Copper Nickel Blind Flanges – Cu-Ni Blind Flanges

Source: Zhejiang Yaang Pipe Industry Co., Limited (

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