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BL Flange
SDFL
This EN1092-1 compliant blind flange is manufactured from low-carbon SUS316L stainless steel, engineered for permanent pipe end closure in ship bilge pipelines, offshore platform piping, and coastal wharf systems. Developed for high-chloride coastal and marine environments, the flange addresses common degradation issues associated with long-term salt fog exposure and seawater immersion, including pitting corrosion, surface peeling, and brittle fracture. Production follows a quality management system certified to ISO 9001, ISO 14001, and ISO 45001, with CE and TS certifications available to support commercial procurement requirements.
Item | Details |
|---|---|
Flange Type | Plate Flange, Welded Neck Flange, Blind Flange, Threaded Flange, Slip On Flange, Socket Welding Flange, Disinfection Pot Flange, Flexible Joint Flange, Tube Sheet, Large Diameter Flange, Press Flange, Pressure Vessel Flange, Lap Flange, Butterfly Valve Flange |
Pipe Fitting Dimensions | Maximum Outer Diameter: 6000 |
Pressure | 150#-2500#, PN0.6-PN400, 5k-40k |
Sealing Surface | RF, FF, RTJ, Groove, Customizable |
Specification | GOST 12820-80 / ANSI B16.5 / EN1092 / BS4504 / JIS B2220-2012 / DIN / ASME B16.5 / UNI - Multiple Standards Compliance |
Wall Thickness | SCH5S, SCH10S, SCH10, SCH40S, SCH20, SCH30, SCH40, SCH60, SCH80, SCH160 |
Stainless Steel | A182 F304/304L, A182 F316/316L, A182 F321, A182 F310S, A182 F347H, A182 F316Ti, 317/317L, 904L, 1.4301, 1.4307, 1.4401, 1.44571, 1.4541, 254MO |
Carbon Steel | A105, A350 LF2, S235JR, S275JR, ST37, ST45.8, A42CP, A48CP, E24, A515 GR60, A515 GR70 |
Duplex Stainless Steel | UNS31803, SAF2205, UNS32205, UNS31500, UNS32750, UNS32760, 1.4462, 1.4410, 1.4501 |
Line Pipe Steel | A694 F42, A694 F52, A694 F60, A694 F65, A694 F70, A694 F80 |
Nickel Alloy | INCONEL 600, INCONEL 625, INCONEL 690, INCOLOY 800, INCOLOY 825, INCOLOY 800H, C22, C-276, MONEL 400, ALLOY 200 |
Cr-Mo Alloy | A182 F11, A182 F5, A182 F22, A182 F91, A182 F9, 16MO3, 15CR MO |
Application | Petrochemical industry, pharmaceutical industry, waste gas system, power plants, shipbuilding, water treatment, and more |
Nom. Pipe Size | T | R | X of Holes | Dia | Bolt Circle | L2 | H | B2 | L | B | r | L3 | B3 | D | C | Thr | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1/2 | 3.75 | 0.56 | 1.38 | 1.5 | 4-0.62 | 2.62 | 2.06 | 0.84 | 0.62 | 0.88 | 0.88 | 0.12 | 0.88 | 0.90 | 0.38 | 0.93 | 0.62 |
3/4 | 4.62 | 0.62 | 1.69 | 1.88 | 4-0.75 | 3.25 | 2.25 | 1.05 | 0.82 | 1.00 | 1.09 | 0.12 | 1.00 | 1.11 | 0.44 | 1.14 | 0.62 |
1 | 4.88 | 0.69 | 2.00 | 2.12 | 4-0.75 | 3.50 | 2.44 | 1.32 | 1.05 | 1.06 | 1.36 | 0.12 | 1.06 | 1.38 | 0.50 | 1.41 | 0.69 |
1-1/4 | 5.25 | 0.75 | 2.50 | 2.50 | 4-0.75 | 3.88 | 2.56 | 1.66 | 1.38 | 1.06 | 1.70 | 0.19 | 1.06 | 1.72 | 0.56 | 1.75 | 0.81 |
1-1/2 | 6.12 | 0.81 | 2.88 | 2.75 | 4-0.88 | 4.50 | 2.69 | 1.90 | 1.61 | 1.19 | 1.95 | 0.25 | 1.19 | 1.97 | 0.62 | 1.99 | 0.88 |
2 | 6.50 | 0.88 | 3.62 | 3.31 | 8-0.75 | 5.00 | 2.75 | 2.38 | 2.07 | 1.31 | 2.44 | 0.31 | 1.31 | 2.46 | 0.69 | 2.50 | 1.12 |
2-1/2 | 7.50 | 1.00 | 4.12 | 3.94 | 8-0.88 | 5.88 | 3.00 | 2.88 | 2.47 | 1.50 | 2.94 | 0.31 | 1.50 | 2.97 | 0.75 | 3.00 | 1.25 |
3 | 8.25 | 1.12 | 5.00 | 4.62 | 8-0.88 | 6.62 | 3.12 | 3.50 | 3.07 | 1.69 | 3.57 | 0.38 | 1.69 | 3.60 | 0.81 | 3.63 | 1.25 |
3-1/2 | 9.00 | 1.19 | 5.50 | 5.25 | 8-0.88 | 7.25 | 3.19 | 4.00 | 3.55 | 1.75 | 4.07 | 0.38 | 1.75 | 4.10 | 4.13 | 1.44 | |
4 | 10.00 | 1.25 | 6.19 | 5.75 | 8-0.88 | 7.88 | 3.38 | 4.50 | 4.03 | 1.88 | 4.57 | 0.44 | 1.88 | 4.60 | 4.63 | 1.44 | |
5 | 11.00 | 1.38 | 7.31 | 7.00 | 8-0.88 | 9.25 | 3.88 | 5.56 | 5.05 | 2.00 | 5.66 | 0.44 | 2.00 | 5.69 | 5.69 | 1.69 | |
6 | 12.50 | 1.44 | 8.50 | 8.12 | 12-0.88 | 10.62 | 3.88 | 6.63 | 6.07 | 2.06 | 6.72 | 0.50 | 2.06 | 6.75 | 6.75 | 1.81 | |
8 | 15.00 | 1.62 | 10.62 | 10.25 | 12-1.00 | 13.00 | 4.38 | 8.63 | 7.98 | 2.44 | 8.72 | 0.50 | 2.44 | 8.75 | 8.75 | 2.00 | |
10 | 17.50 | 1.88 | 12.75 | 12.62 | 16-1.12 | 15.25 | 4.62 | 10.75 | 10.02 | 2.62 | 10.88 | 0.50 | 3.75 | 10.92 | 10.88 | 2.19 | |
12 | 20.50 | 2.00 | 15.00 | 14.75 | 16-1.25 | 17.75 | 5.12 | 12.75 | 12.00 | 2.88 | 12.88 | 0.50 | 4.00 | 12.92 | 12.94 | 2.38 | |
14 | 23.00 | 2.12 | 16.25 | 16.75 | 20-1.25 | 20.25 | 5.62 | 14.00 | 13.25 | 3.00 | 14.14 | 0.50 | 4.38 | 14.18 | 14.19 | 2.50 | |
16 | 25.50 | 2.25 | 18.50 | 19.00 | 20-1.38 | 22.50 | 5.75 | 16.00 | 15.25 | 3.25 | 16.16 | 0.50 | 4.75 | 16.19 | 16.19 | 2.69 | |
18 | 28.00 | 2.38 | 21.00 | 21.00 | 24-1.38 | 24.75 | 6.25 | 18.00 | 17.25 | 3.50 | 18.18 | 0.50 | 5.12 | 18.20 | 18.19 | 2.75 | |
20 | 30.50 | 2.50 | 23.00 | 23.12 | 24-1.38 | 27.00 | 6.38 | 20.00 | 19.25 | 3.75 | 20.20 | 0.50 | 5.50 | 20.25 | 20.19 | 2.88 | |
22 | 33.00 | 2.63 | 25.25 | 25.25 | 24-1.63 | 29.25 | 6.50 | 22.00 | 21.25 | 4.00 | 22.22 | 0.50 | 5.75 | 22.25 | 22.19 | 3.13 | |
24 | 36.00 | 2.75 | 27.25 | 27.62 | 24-1.62 | 32.00 | 6.62 | 24.00 | 23.25 | 4.19 | 24.25 | 0.50 | 6.00 | 24.25 | 24.19 | 3.25 |
The marine-grade blind flange adopts low-carbon SUS316L stainless steel with molybdenum alloying elements. Compared to standard 304 stainless steel, the molybdenum content enhances resistance to chloride-induced pitting and crevice corrosion in seawater and salt fog environments. The low-carbon composition reduces carbide precipitation during welding, lowering the risk of intergranular corrosion for on-site fabrication work.
The flange is manufactured through integral forging, which creates uniform internal stress distribution and reduces crack risk under prolonged hull vibration. The entire flange undergoes full pickling passivation treatment, forming a stable chromium-rich passive film on the surface. Based on internal accelerated corrosion test data, this treatment extends service life in coastal environments by 2.2 times relative to standard mechanically polished 304 blind flanges.
The product has passed a 5000-hour neutral salt spray test, verifying its corrosion resistance in coastal atmospheric environments. The 316L material grade supports permanent immersion in seawater, making it suitable for submerged piping systems on ships and offshore platforms.
With a solid thickened disc structure, this blind flange has a pressure rating of PN25, withstanding hydraulic impact pressure up to 2.5 MPa. This pressure capacity accommodates common offshore working conditions, including hull sway vibration and seawater water hammer impact.
The flange features a fine-ground RF (Raised Face) sealing surface, designed to pair with marine oil-resistant rubber gaskets. This sealing configuration maintains consistent performance under floating pipeline vibration, suitable for circulating seawater and bilge sewage media.
This blind flange is widely used for standby pipe closure on offshore platforms, pipe end blocking of ship sewage pipelines, isolation of coastal fire protection pipelines, and blanking of seaside circulating water pipelines. Standard stock sizes cover DN20 to DN600, supporting urgent order requirements from shipyards. The product is packed with marine anti-collision export packaging, and full ship inspection and customs documentation are available with each order. A 20-year anti-corrosion warranty applies for marine atmospheric and splash zone applications under standard installation and operating conditions.
Yes. The marine-grade 316L material formulation is designed for long-term contact with seawater, supporting permanent immersed sealing applications when installed per specification.
Each batch undergoes ultrasonic internal defect inspection and full hydraulic tightness test, aligned with ship classification inspection standards. Material test reports and inspection certificates are available upon request for commercial procurement documentation.
Yes. Custom production covers diameters from DN15 to DN4000 via CNC machining, with support for ASME, ISO, JIS, or proprietary specifications as required by individual projects.
