Henan Sheng He Pipe Industry Co., Ltd., have an experience spanning for over ten years, producing and supplying best-in-class products, minimize cost by getting manufacturing processes under one roof and delivering consignments on a daily basis only because of a diligent and dedicated team. We are manufacturers, suppliers and exporters of Blind Flanges.
Blind Flanges are mostly used to seal the end or opening of a pipe, which is why they come without a bore. This comes in handy for inspection and pressure tests, as it allows quick access to the pipe.
Blind Flange production process
Dimensions Blind Flanges & Stud Bolts ASME B16.5
| OTHER DIA | NPS 1/2 | ||||||
| CLass | 150 | 300 | 600 | 900 | 1500 | 2500 | |
| DIA D | 90 | 95 | 95 | 120 | 120 | 135 | |
| B | 11.2 | 14.3 | 20.7 | 28.7 | 28.7 | 36.6 | |
| DIA G | 35.1 | 35.1 | 35.1 | 35.1 | 35.1 | 35.1 | |
| DIA K | 60.3 | 66.7 | 66.7 | 82.6 | 82.6 | 88.9 | |
| NO. L | 4 | 4 | 4 | 4 | 4 | 4 | |
| DIA L | 15.9 | 15.9 | 15.9 | 22.2 | 22.2 | 22.2 | |
| Stud Bolts Diameter x Length | |||||||
| DIA (in) | 1/2 | 1/2 | 1/2 | 3/4 | 3/4 | 3/4 | |
| lgth (mm) | 55 | 65 | 75 | 110 | 110 | 120 | |
Notes..
- Dimensions are in millimeters unless otherwise indicated.
- The length of the Stud Bolt does not include the height of the chamfers (points).
- IMPORTANT! please read this short article
Dimensional Tolerances of Blind Flanges ASME B16.5
Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
Inside Diameter
not applicable
Outside Diameter of Hub
≤ 12 = + 2.4 mm / – 1.6 mm
≥ 14 = ± 3.2 mm
Drilling
Bolt Circle = 1.6 mm
Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle
≤ 2.1/2 = 0.8 mm max.
≥ 3 = 1.6 mm max.
Thickness
≤ 18 = + 3.2 mm / – 0
≥ 20 = + 4.8 mm / – 0
Length thru Hub
≤ 18 = + 3.2 mm / – 0.8 mm
≥ 20 = + 4.8 mm / – 1.6 mm
Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face
Tongue and Groove / Male-Female ± 0.4 mm
Blind Flanges Specification:
| Standard | Type | Class | Size |
| ASME B16.5 | WN/LWN/SO/Blind/Lap Joint | 150#-2500# | 1/2″-24″(Except Blind Flange 2500lb 1/2″-12″) |
| DIN2543 | SO flange | PN16 | DN10-DN1000 |
| DIN2544 | SO flange | PN25 | DN10-DN1000 |
| DIN2545 | SO flange | PN40 | DN10-DN500 |
| Sealing Surface | RF FF RTJ TF GF LF LM | ||
| Flange Face Finish | Stock Finish/Spiral Serrated/Concentric Serrated/Smooth Finish(Ra 3.2 and 6.3 micrometers) | ||
| 125-250 AARH(it is called smooth finish) | |||
| 250-500 AARH(it is called stock finish) | |||
| Coating | Vanish, yellow paint, anti-rust oil, galvanizing etc | ||
Blind Flanges Material Grades:
| Nickel Alloy Steel | ASTM/ASME B/SB 564 UNS N02200(NICKEL 200), UNS N04400, (MONEL 400),UNS N08825( INCOLOY 825), UNS N06600(INCONEL 600), UNS N06601(INCONEL 601),UNS N06625(INCONEL 625), UNS N10276(HASTELLOY C276) ASTM/ASME B/SB160 UNS N02201(NICKEL 201), ASTM B/SB472 UNS N08020(Alloy 20) |
| Stainless Steel | ASTM/ASME A/SA 182 F304, 304L, 304H, 310H, 316, 316H, 316L, 316Ti, 317, 317L, 321, 321H, 347, 347H, 904L |
| Duplex andSuper Duplex | ASTM/ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61,S31803, S32205, S32550, S31254, SMO254, S32750, S32760, S32950 |
| Carbon Steel | ASTM/ASME A/SA 105(N) |
| Low Temp Carbon Steel | ASTM/ASME A/SA350 LF2 |
| High Yield Carbon Steel | ASTM/ASME A/SA694 F52, F56, F60, F65, F70 |
| Alloy Steel | ASTM/ASME A/SA182 GR F5, F9, F11, F12, F22, F91 |