Blind Flange Cover Introduction

Full Name of Blind Flange Cover: Steel Pipe Flange Cover, Abbreviated as BL in English

Alias: Flange Blank, Flange Cover, Plug, Lid, etc. have different names but mean the same thing.

The blanking flange cover is solid in the middle, serving as a sealing function for the pipeline. The difference between a blanking flange and a cap is that the blanking flange is a removable seal, whereas the cap is a non-removable seal that is welded directly onto the pipeline.

Blind Flange Cover Features

The flange cover can withstand a higher pressure rating than the blanking plug, and it is also removable, offering a variety of sealing surfaces.

Blind flanges serve the same isolation and cutoff functions as caps, pipe caps, and welded plug caps. Due to their excellent sealing performance, they are generally regarded as reliable isolation methods for systems requiring complete isolation.

Specification Model

DN15-DN2000

Pressure Rating

PN2.5;PN6;PN10;PN16;PN25;PN40;PN63;PN100;PN160;

Sealing Surface Type

Rough Face (RF), Full Flat (FF), Middle Flat (MFM), Concave Face (FM), Middle (M), Tongue and Groove (TG)

Common Materials

Carbon Steel Flanges: 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 Flanges: ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8

Alloy Steel Flanges: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/Ⅲ

Execution Standards

Steel Pipe Flange Cover: GB/T 9123-2010

Marine Blind Flange for Ship: GB/T4450-1995

Chemical Industry Standard: HG20592-2009, HG20615-2009, HG20601-97

Mechanical Department Standard: JB/T86.1-94, JB/T86.2-94

Electricity Industry Standard: D-GD86-0513

Connection Type

Add flange gasket, and bolt the flange in place.

Production Process

Generally, there are four types: forging, casting-forging, medium plate cutting, and casting. Among them, forging products are priced higher, followed by medium plate, then casting-forging, and casting is the least preferred in terms of craftsmanship. In terms of quality, forging and medium plate are superior, with casting-forging being slightly inferior.

Procurement Recommendations

1: Recommend purchasing from a reputable flange blank manufacturer, which should have a certain production scale.

2: Manufacturers of flanges need to provide material inspection reports and related documents for blind flange covers.

3: Blind flange covers must have corresponding specification model stamps and markings.