What is Blind flange? Stainless steel flanges, also known as specialty flanges, are popular accessories of pipe facades. In a war blind mind there is no mistake to cover the top of the pipe, preventing flow from circulating.
Stainless steel flanges are often installed in the form of a standby tube. When adding another system or device, it can be easily removed and installed, are applied to production standard products such as JIS, BS, ANSI, DIN, all size industrial pipes are sized for blind face use.
Blind flange standards at QMS
- Steel grade: SUS 304, 304L, 316, 316L
- Standards: JIS, BS, DIN
- Origin: Vietnam, Taiwan, Korea, China, other…
- Specification: Diameter DN10 – DN2000
- Applications: Wastewater treatment, environment, refrigeration, M&E, petrochemical industry, oil and gas, water supply and drainage, high-rise buildings…
Refer to the blind flange technical standards table
Technical specifications of JIS standard stainless steel blind flanges Flanges 20 Class 150 Flanges
| Nominal | O | T1 | R | X | No.2/Dia of Holes | Bolt Circle Dia | L21 | H | B23 | L | B | r | L34 | B3 | D |
| Pipe Size | |||||||||||||||
| 1/2 “ | 3.5 | 0.44 | 1.38 | 1.19 | 4-0.62 | 2.38 | 1.88 | 0.84 | 0.62 | 0.62 | 0.88 | 0.12 | 0.62 | 0.9 | 0.38 |
| 3/4 “ | 3.88 | 0.5 | 1.69 | 1.5 | 4-0.63 | 2.75 | 2.06 | 1.05 | 0.82 | 0.62 | 1.09 | 0.12 | 0.62 | 1.11 | 0.44 |
| 1 “ | 4.25 | 0.56 | 2.00 | 1.94 | 4-0.64 | 3.12 | 2.19 | 1.32 | 1.05 | 0.69 | 1.36 | 0.12 | 0.69 | 1.38 | 0.5 |
| 1 1/4 “ | 4.62 | 0.62 | 2.50 | 2.31 | 4-0.65 | 3.5 | 2.25 | 1.66 | 1.38 | 0.81 | 1.7 | 0.19 | 0.81 | 1.72 | 0.56 |
| 1 1/2 “ | 5.00 | 0.68 | 2.88 | 2.56 | 4-0.66 | 3.88 | 2.44 | 1.9 | 1.61 | 0.88 | 1.95 | 0.25 | 0.88 | 1.97 | 0.62 |
| 2 “ | 6.00 | 0.75 | 3.62 | 3.06 | 4-0.67 | 4.75 | 2.5 | 2.38 | 2.07 | 1 | 2.44 | 0.31 | 1 | 2.46 | 0.69 |
| 2 1/2 “ | 7.00 | 0.88 | 4.12 | 3.56 | 4-0.68 | 5.5 | 2.75 | 2.88 | 2.47 | 1.12 | 2.94 | 0.31 | 1.12 | 2.97 | 0.75 |
| 3 “ | 7.5 | 0.94 | 5 | 4.25 | 4-0.69 | 6 | 2.75 | 3.5 | 3.07 | 1.19 | 3.57 | 0.38 | 1.19 | 3.6 | 0.81 |
| 3 1/2 “ | 8.5 | 0.94 | 5.5 | 4.81 | 8-0.75 | 7 | 2.81 | 4 | 3.55 | 1.25 | 4.07 | 0.38 | 1.25 | 4.1 | 0.88 |
| 4 “ | 9.00 | 0.94 | 6.19 | 5.31 | 8-0.75 | 7.5 | 3 | 4.5 | 4.03 | 1.31 | 4.57 | 0.44 | 1.31 | 4.6 | 0.94 |
| 5 “ | 10 | 0.94 | 7.31 | 6.44 | 8-0.88 | 8.5 | 3.5 | 5.56 | 5.05 | 1.44 | 5.66 | 0.44 | 1.44 | 5.69 | 0.94 |
| 6 “ | 11 | 1 | 8.5 | 7.56 | 8-0.88 | 9.5 | 3.5 | 6.63 | 6.07 | 1.56 | 6.72 | 0.5 | 1.56 | 6.75 | 1.06 |
| 8 “ | 13.5 | 1.12 | 10.62 | 9.69 | 8-0.88 | 11.75 | 4 | 8.63 | 7.98 | 1.75 | 8.72 | 0.5 | 1.75 | 8.75 | 1.25 |
| 10 “ | 16 | 1.19 | 12.75 | 12 | 12-1.00 | 14.25 | 4 | 10.75 | 10.02 | 1.94 | 10.88 | 0.5 | 1.94 | 10.92 | 1.31 |
| 12 “ | 19 | 1.25 | 15 | 14.38 | 12-1.00 | 17 | 4.5 | 12.75 | 12 | 2.19 | 12.88 | 0.5 | 2.19 | 12.93 | 1.56 |
| 14 “ | 21 | 1.38 | 16.25 | 15.75 | 12-1.12 | 18.75 | 5 | 14 | 13.25 | 2.25 | 14.14 | 0.5 | 3.12 | 14.18 | 1.63 |
| 16 “ | 23 | 1.44 | 18.5 | 18 | 16-1.26 | 21.25 | 5 | 16 | 15.25 | 2.5 | 16.16 | 0.5 | 3.44 | 26.19 | 1.75 |
| 18 “ | 25 | 1.56 | 21 | 19.88 | 16-1.25 | 22.75 | 5.5 | 18 | 17.25 | 2.69 | 18.18 | 0.5 | 3.81 | 18.2 | 1.94 |
| 20 “ | 27.5 | 1.69 | 23 | 22 | 20-1.25 | 25 | 5.69 | 20 | 19.25 | 2.88 | 20.2 | 0.5 | 4.06 | 20.25 | 2.13 |
| 22 “ | 29.5 | 1.81 | 25.25 | 24.25 | 20-1.38 | 27.25 | 5.88 | 22 | 21.25 | 3.13 | 22.22 | 0.5 | 4.25 | 22.25 | 2.38 |
| 24 “ | 32 | 1.88 | 27.25 | 26.12 | 20-1.38 | 29.5 | 6 | 24 | 23.25 | 3.15 | 24.25 | 0.5 | 4.38 | 24.25 | 2.5 |
Types of blind flanges
In fact, there are different types of blind flanges applicable to different needs, specifically:
RF Blind Flange (Raised Face)
RF (Raised face) is called raised face because the surfaces of the gasket are raised to the surface of the screw circle. Raised face blind flanges increase the pressure blocking ability of the joint.
FF Blind Flange (Flat Face)
FF (Flat face) is called flat face because the surfaces of the gasket are in the same plane as the screw circle face. Flat face blind flange is used full face gasket.
Blind Flange RTJ (Round Qualifying Joint)
RTJ (Ring type joint) is designed with grooves cut into the surface and has a raised surface with connecting grooves and is tightened to make contact with each other.
Characteristics of blind stainless steel flanges
Blind stainless steel flanges are made from high quality stainless steel such as SUS 304, 304L, 316, 316L. Below are some common characteristics of stainless steel blind flanges:
- The product has high aesthetics and durability.
- 304 and 316 stainless steel blind flanges are resistant to chemicals and corrosives.
- Flanges made of 304 stainless steel and 316 stainless steel are resistant to corrosive substances and chemicals.
- Withstands environments of high pressure and temperature.
- High applicability, safety, low price.
Applications of blind flanges in industry and in life
Stainless steel blind flanges or solid flanges are mainly used to block fluid flows from the first and last installed pipes. Applications of stainless steel blind flanges are often used in:
- Industrial construction industry – Industrial M&E system.
- High-rise building construction industry – Construction M&E System.
- Environmental industry – Wastewater treatment.
- Petroleum and petrochemical industry – Oil pipeline system.
- Gas supply industry.
- Chemical industry – Piping systems.
- And other industries.
Supplier of international quality blind flanges in Ho Chi Minh City
QMS – Quang Minh Stainless Steel Company specializes in providing quality standard blind flange products including blind flange DN100, blind flange DN80, blind flange DN50, blind flange DN150, blind flange DN200,… Has clear origin and quality meets international standards.
