A blind flange (also called a ‘closure plate flange’) is installed at the end of a piping system to terminate a pipe. It has no centre hole (bore), so there is no flow through the flange. A blind flange may be used for isolating a pipe, valve, or pressure vessel. This type of flange is available in all sizes and classes, and may use a flat, raised, or ring-type joint face.
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Details of Blind Flange: 1. blind flange; 2. stud bolt |
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A blind flange can replace a butt weld cap in case an extension of the piping line is required, or in case a piping inspection is required (remove the blind flange to access the pipe interior). This type of flange can also be used as the rod access point on drain systems. Depending upon the application, a blind flange may be drilled and used as a slip-on flange, or tapped and used as a threaded flange.
Despite its simplistic design, this type of flange is comparatively expensive.
Non-Destructive Testing (NDT) Techniques
Blind flanges are not usually part of any routine non-destructive inspection (NDI) program. It is possible to measure the thickness of a blind flange as a precautionary measure, but this rarely occurs.
ASME Standards
The ASME B16.5 standard details the dimensions and tolerance requirements for blind flanges.
Standard Specification For Blind flanges
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Dimensions |
ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings |
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Size |
1/2" (15 NB) to 48" (1200NB) |
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Class |
150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc. |
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DIN |
DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673 |
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BS |
BS4504 , BS4504, BS1560, BS10 |
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Flange Face Type |
Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
Material & Grades of Blind flanges
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Stainless Steel Blind flanges |
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L |
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Duplex & Super Duplex Steel Blind flanges |
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61 |
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Carbon Steel Blind flanges |
ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706 |
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Low Temperature Carbon Steel Blind flanges |
ASTM A350, LF2, LF3 |
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Alloy Steel Blind flanges |
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91 |
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Copper Alloy Steel Blind flanges |
ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200 |
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Nickel Alloy Blind flanges |
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020) |
ASME B16.5 Raised Blind flanges Available Types
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Blind Raised Face Flange |
Raised Faced Blind Flanges |
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ANSI B16.5 Blind Flanges |
Blind Flange Dimensions |
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ASME B16.5 BLRF Flanges |
ANSI B16.5 Class 150 Blind Flanges |
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Stainless Steel Blind Flanges Suppliers |
SS Blind Flange |
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Blind Plate Flanges Dealer |
ASME B16.47 Series A and B BLRF Flanges Exporter |
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ANSI B16.5 class 150 BLRF Flange Stockholder |
ANSI 150 Blind Flange Distributors |
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Carbon Steel Blind Flange |
High Quality BLRF Flanges Manufacturer |
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ASTM A182 Stainless Steel BLRF Flange |
Duplex Steel Blind Flange |
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Super Duplex Steel Blind Forged Flange |
Copper Nickel Blind Pipe Flanges |
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High Nickel Alloy BLRF Flanges |
Hastelloy Flat Faced Blind Flanges Stockist |
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Titanium ASME B16.47 Series A and B BLRF Flanges |
Inconel Blind Flanges |
ANSI B16.5 Blind flanges Application
ASME B16.5 Blind Flanges are known to deliver exceptional performance and are generally developed for meeting the demands. We offer a broad range of Flat Faced Blind Flanges through a worldwide network of stock-keeping branches. These Blind Flange is use in various industries like :
Stainless Steel Blind Flanges uses in Oil and Gas Pipeline
Blind Raised Face Flanges uses in Chemical Industry
Alloy Steel BLRF Flanges uses in Plumbing
Flat Faced Blind Flanges uses in Heating
Blind Pipe Flanges uses in Water Supply Systems
ANSI B16.5 Blind Forged Flanges uses in Power Plant
Blind Plate Flanges uses in Paper & Pulp Industry
Blind Flange uses in General Purpose Applications
