What is Blind Flange?
Blind Flange (also called Blind Flange or Blind Plate) is a type of flange connection form. Essentially, it is a flange without a central bore.
Its primary functions include:
Sealing the end of a pipeline.
Facilitating the removal of debris during maintenance.
In terms of sealing, it serves a similar purpose as headers or pipe caps. However, unlike headers (which are permanently welded), blind flanges are bolted on, allowing for easy disassembly when needed.
Blind flanges are available in various materials, including carbon steel, alloy steel, and stainless steel.
Specification of Blind Flanges
DN15-DN2000
General use OD range: 1/2", 2", 3", 4", 6", 8", 10", 12", to 24", Up to 60"(special made OD).
Surface Treatment: Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.
Blind Flange Pressure Grade
PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320, PN400
Class 150, Class 300, Class 600, Class 900, Class 1500, Class 2500
Blind Flange Materials
Carbon Steel Flange: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65 ,F70;
Stainless Steel Flange: ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;
Alloy Steel Flange: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/Ⅲ;
Blind Pipe Flange Face Types
RF (Raised Face);
FF (Flat Face);
M&F (Male-and-Female Face);
RTJ (Ring-Type Joint)
F (Female Face);
M (Male Face);
T&G (Tongue and Groove Face);
Blind Pipe Flange Standards
ANSI, ASME, JIS, DIN, BS4504, SABS1123, EN1092-1, UNI, AS2129, GOST-12820
Steel Pipe Flange: GB/T 9123-2010
Marine Steel Blind Flange: GB/T4450-1995
Ministry of Chemical Industry Standards: HG20592-2009, HG20615-2009, HG20601-97
Machinery Department Standard: JB/T86.1-94, JB/T86.2-94
Power Standard: D-GD86-0513
