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Home Products Flange cover Flange cover
Flange cover
Flange cover
Flange cover
Flange cover
Flange cover
Flange cover
Flange cover
Flange cover

Flange cover

A flange cover, also known as a Blind Flange, is a solid circular flange with no bore in the center. It is mainly used to block the end of pipelines, isolate equipment outlets, or serve as a temporary seal during system pressure testing and maintenance. The products cover the European standard system (PN series) and the American standard system (CLASS series). Types of sealing faces include Raised Face (RF), Male and Female Face (MFM), Tongue and Groove Face (TG), and Ring Joint Face (RJ). Available materials include stainless steel, duplex steel, alloy steel, and special metals such as titanium and Hastelloy. Featuring reliable sealing and easy assembly and disassembly, they are widely used in industrial piping systems for petroleum, chemical, power, pharmaceutical and other industries.
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Product Details

Steel Pipe Flange Cover (Blind Flange)


Standard: HG/T 20601-2009 (PN/European System), HG/T 20622-2009, GB/T 9123

Type code: BL (Blind Flange / Flange Cover)

Alias: Blind Plate, Flange Cap, Blank Flange, Blanking Disc


1. Product Overview

The flange cover is a solid circular plate with no central bore. It is bolted to a matching pipe flange to:

Seal off the end of a pipeline

Isolate equipment during maintenance or pressure testing

Serve as a removable alternative to a welded pipe cap or head

It can be manufactured from stainless steel, carbon steel, alloy steel, duplex steel, titanium, Hastelloy, etc.


2. Pressure Rating & Size Range (from catalog)

PN Series (European system): PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320, PN400
CLASS Series (American system): Class 150 – Class 2500
Nominal size: DN15 – DN2000 (1/2" – 80")
Material: 304, 304L, 316L, 321, 310S, 904L, S22053 (duplex), titanium, Hastelloy, etc.

3. Sealing Face Types

RF – Raised Face 
FF – Flat Face / Full Face 
MFM – Male & Female 
TG – Tongue & Groove 
RJ – Ring Joint 

4. Dimension Symbols (Blind Flange)

Symbol

Description

DN

Nominal diameter

D

Flange outside diameter

K

Bolt circle diameter (pitch circle)

L

Bolt hole diameter

n

Number of bolt holes

Th

Bolt thread size

C

Flange thickness (excluding raised face)

f

Raised face height (usually 2 mm for PN≤40)

G

Raised face outside diameter


5. Typical Dimensions (HG/T 20601, PN16, mm)

DN

D

K

L

n

Th

C

RF ØG

15

95

65

14

4

M12

16

39

25

115

85

14

4

M12

18

57

50

165

125

18

4

M16

19

87

100

220

180

18

8

M16

22

149

150

285

240

22

8

M20

24

203

200

340

295

22

8

M20

26

259

250

405

355

26

12

M24

29

312

300

460

410

26

12

M24

32

363

400

580

525

30

16

M27

38

473

500

715

650

33

20

M30

46

575

600

840

770

36

20

M33

52

675

(Values are typical; final specs follow HG/T 20601 tables by pressure class.)


Key features:

No central hole (blind)

No neck / hub

Bolt holes drilled on pitch circle K

Optional center threaded vent hole available


6. Application Scenarios

Pipeline end closure

Valve / pump outlet isolation

Pressure vessel nozzle blanking

Hydrostatic / pneumatic testing

Temporary maintenance isolation in petrochemical, power, food, pharma plants


7. Ordering Description Example

BL 150-16 RF S30408 HG/T 20601

(DN150, PN16, Raised Face, 304 stainless steel, blind flange)



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