Blind Flange

2019-06-18 17:23:11 Views:2167 Blind Flange / Forged Flanges / Products

What is a blind flange?

A blind flange also called blank flange,it looks like a plate with bolts holes around.The function of a blind flange is like a pipe cap,but it could be assembly easily by the bolts.There is no inner hole on the blind flange comparing to other type flanges,so the blind flange is used to close the end of a vessel or piping system,and it is not connect with any pipe or vessel.Blind flange also be used for pressure testing for prevent the liquid or air flow.

ASTM A350 LF2 Blind Flanges

Specification of blind flange:

ANSI/ASME standard:

ANSI/ASME B16.5 class 150 blind flange dimensions: ½”-24″
ANSI/ASME B16.5 class 300 blind flange dimensions: ½”-24″
ANSI/ASME B16.5 class 400 blind flange dimensions: ½”-24″
ANSI/ASME B16.5 class 600 blind flange dimensions: ½”-24″
ANSI/ASME B16.5 class 900 blind flange dimensions: ½”-24″
ANSI/ASME B16.5 class 1500 blind flange dimensions: ½”-24″
ANSI/ASME B16.5 class 2500 blind flange dimensions: ½”-12″
ANSI/ASME B16.47 series A class 150 blind flange dimensions: 22″-48″
ANSI/ASME B16.47 series A class 300 blind flange dimensions: 22″-48″
ANSI/ASME B16.47 series A class 400 blind flange dimensions: 22″-48″
ANSI/ASME B16.47 series A class 600 blind flange dimensions: 22″-48″
ANSI/ASME B16.47 series A class 900 blind flange dimensions: 22″-48″
ANSI/ASME B16.47 series B class 75 blind flange dimensions: 26″-48″
ANSI/ASME B16.47 series B class 150 blind flange dimensions: 26″-48″
ANSI/ASME B16.47 series B class 300 blind flange dimensions: 26″-48″
ANSI/ASME B16.47 series B class 400 blind flange dimensions: 26″-36″
ANSI/ASME B16.47 series B class 600 blind flange dimensions: 26″-36″
ANSI/ASME B16.47 series B class 900 blind flange dimensions: 26″-36″

BS standard:

BS 4504 blind flange:

DIN standard:

DIN 2527 PN6 blind flange dimensions: DN10-DN1000
DIN 2527 PN 10 blind flange dimensions: DN10-DN1000
DIN 2527 PN16 blind flange dimensions: DN10-DN2000
DIN 2527 PN 25 blind flange dimensions: DN10-DN1000
DIN 2527 PN 40 blind flange dimensions: DN10-DN1000

EN standard:

EN 1092-1 PN6 blind flange dimensions: DN10-DN2000
EN 1092-1 PN10 blind flange dimensions: DN10-DN1200
EN 1092-1 PN16 blind flange dimensions: DN10-DN1000
EN 1092-1 PN25 blind flange dimensions: DN10-DN600
EN 1092-1 PN40 blind flange dimensions: DN10-DN600

JIS standard:

JIS B2220 blind flange 5K: 10-750A
JIS B2220 blind flange 10K: 10-800A
JIS B2220 blind flange 20K: 10-600A
JIS B2220 blind flange 30K: 10-400A

ANSI B16.5 ASTM A182 F304 blind flanges

Materials of blind flange:

Commonly the material of blind flange should be same with the matched flange for joint.Since the blind flange is not welded with the pipes or vessel,some times the material could be different with the pipe material or the other flange in the joint.Haihao Group manufacture blind flanges with various materials,such as carbon steel,stainless steel and alloy steel.

Carbon steel blind flange:

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

Stainless steel blind flange:

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

Alloy steel blind flange:

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

Sealing face of blind flange:

The sealing face of blind flange can be flat face (FF), raised face(RF) or ring joint face(RTJ).The RTJ face blind flange is used for high pressure application,and the matched flange also should be RTJ face.

Application of blind flange:

Blind flanges are commonly used in petrochemical, pipe engineering, public services and water works.A blind flange is useful for pipe maintenance.In fact,during construction of a pipeline,a blind flange may be installed at the end of the pipeline.This allows for expansion or continuation of the pipeline simply by adding onto the end flange.

Haihao Group are specialized in the production of forged flanges,our forged flange products as follows:

Weld Neck Flange	Blind Flange	Slip On Flange	Flat Flange
Socket Weld Flange	Threaded Flange	Lap Joint Flange	Long Weld Neck Flange
Orifice flange	Spectacle Blind Flange	Nipoflange	Reducing Flange
Anchor Flanges	Large Diameter Flange	Tubesheet	Non-standard Flange