Blind Flange BL
BL blind flange is a dedicated sealing, isolation, and pressure testing safety accessory for piping systems. It has a solid, hole-free structure and is bolted to a flange of the corresponding specification, paired with a gasket to achieve complete sealing and plugging. It is mainly used for closing pipe ends, plugging spare pipe openings, isolating pipe sections, and capping equipment interfaces, and can be used for permanent plugging or temporary maintenance plugging. It is widely used in pipeline hydrostatic pressure testing, airtightness testing, sectional pressure testing and acceptance of engineering projects, pipeline modification isolation, and closure of abandoned pipe openings. It can effectively isolate media, block fluid flow, prevent medium leakage and impurities from entering the pipeline, and ensure the safety of maintenance and construction. It is suitable for oil and gas, chemical, power, municipal, and fire protection piping systems, and is an indispensable core pressure-bearing pipe fitting for pipeline pressure testing, safety isolation, and engineering acceptance.
Inquiry
- BL blind flange made by solid integral forging
- No sand holes, no air pores, no interlayers
- High density, extremely strong pressure-bearing performance
- Resistant to high pressure, resistant to impact, not easy to deform or crack. All series sizes are standard, bolt hole positions are precise, sealing surface flatness is high
- Excellent butt joint sealing
Detailed Introduction
BL blind flange adopts an integral solid forging process, with no sand holes, air pores, or laminations, high density, strong pressure-bearing performance, resistance to high pressure and impact, and not easy to deform or crack. The full range of sizes is standard, bolt hole positions are precise, sealing surface flatness is high, and when paired with gaskets it can achieve zero-leakage sealing, suitable for permanent plugging or repeated disassembly and pressure testing. Products cover mainstream standards such as ASME, GB, HG, EN, etc., with nominal diameters DN15-DN1200, pressure Class150-2500LB or PN6-PN160, and sealing surface forms including RF, FF, MFM, TG, RJ, etc. We keep regular stock, support low minimum order quantities, mixed batches, and non-standard customization, and provide export-grade packaging and after-sales service to meet the procurement needs of global B2B customers.
- Solid forging, no sand holes or air pores, strong pressure-bearing performance, suitable for high-pressure pressure testing working conditions
- Precision-machined sealing surface, paired with gaskets to achieve zero leakage, can be repeatedly disassembled and used
- Covers multiple standards such as American standard, national standard, chemical industry, and European standard, with complete specifications
- Supports non-standard customization, including extra-large diameters, ultra-high pressure, special materials, and surface treatment
- Sufficient stock, commonly used specifications shipped within 24 hours, stable delivery time
- Export-standard packaging, supports neutral packaging and LOGO branding, suitable for sea freight export
| Product Name | Blind Flange BL |
| Category | Contact us to confirm |
| Standard | ASME B16.5/B16.47, GB/T9123, HG/T20592, EN1092-1; nominal diameter: DN15-DN1200 (NPS1/2″-48″); pressure rating: Class150-2500LB, PN6-PN160; sealing surface forms: RF, FF, MFM, TG, RJ; product structure: solid non-porous forged flange cover; process: integral forging, heat treatment, precision turning, non-destructive testing; connection method: bolt-fastened sealed connection; working temperature: carbon steel -20℃~425℃, stainless steel -196℃~600℃; suitable media: water, steam, oil and gas, chemical fluids, corrosive media. All parameters strictly |
| Customization | Our factory possesses full-dimensional BL blind flange non-standard customization capabilities, and can customize ultra-large diameter, ultra-high pressure thickened, non-standard irregular sizes, and non-standard thickness flange covers. We support customization of special sealing surfaces, high-precision flat polishing, and high-pressure RJ ring groove precision machining, suitable for high-end high-pressure working conditions. We can perform surface treatment processes such as sandblasting and rust removal, blackening, hot-dip galvanizing, epoxy anti-corrosion, and acid and alkali resistant coatings. We can reverse-customize special thickened test pressure blind flanges according to customer drawings, samples, and engineering pressure test parameters. We support laser marking, LOGO engraving, batch number customization, and exclusive packaging and OEM labeling. We can produce high-precision and advanced material products such as duplex steel, low-temperature steel, and nickel-based alloys, suitable for overseas high-end chemical, power, and special equipment customization needs. |
| MOQ | Our factory's BL blind flanges support an ultra-low-threshold flexible minimum order model. For conventional national standard and American standard in-stock specifications, the MOQ is as low as 1 piece, fully meeting the needs of sample testing, engineering pressure test supplementary parts, equipment repair and replacement, and small trial orders. Commonly used carbon steel and stainless steel specifications with conventional diameters and conventional pressure ratings on the market support scattered purchasing, mixed batches of multiple specifications, and combined shipment, with no mandatory minimum order restrictions. |
| Lead Time | Conventional national standard and American standard standard BL blind flange flanges are kept in massive stock. Common specifications ship within 24 hours at extreme speed, quickly responding to customers' urgent orders, replenishment orders, and pressure test emergency needs. Conventional bulk standard orders have a production lead time of 3-7 working days, with stable and efficient shipment. Ordinary non-standard thickened, hole-modified, and special sealing face machining orders have a lead time of 7-10 working days. Extra-large diameter, ultra-high pressure |
| Packaging | Our factory's BL blind flange adopts standardized protective packaging specially for foreign trade export, providing full-process rust prevention, collision prevention, and sealing surface damage prevention. The product sealing surface is affixed with thickened dust-proof and scratch-proof protective film to completely prevent transportation wear, scratches, and oxidation rust. Each piece is individually wrapped and isolated with bubble film to avoid friction and collision damage; conventional specifications are classified and packed into thickened export cartons, and large-volume full orders are packed with fumigated solid wood pallets, reinforced with steel straps for stability, suitable for long-distance ocean shipping. The outer packaging clearly marks the model, standard, material, pressure, specification, quantity, batch, and export shipping mark information. It supports neutral packaging, customer LOGO branding, customized shipping marks, and exclusive packaging box customization, fully complying with the standardized packaging requirements for export commodity inspection, customs clearance, and overseas warehousing. |
| Reference Price | Inquiry |
Applications
- Pipeline pressure testing: used for hydrostatic pressure testing and airtightness testing to ensure the sealing performance of the pipeline system
- Segmented isolation: During pipeline modification or maintenance, isolate the pipe section to ensure construction safety
- Permanent sealing: seal off abandoned pipe openings or spare connections to prevent medium leakage
- Equipment blind cover: used for plugging idle connections of equipment such as pressure vessels and heat exchangers
- Engineering acceptance: as a standard fitting for sectional pressure testing acceptance of pipeline engineering
Overview
BL blind flange is a solid, non-perforated forged flange cover, used for plugging, isolation, and pressure testing of pipeline systems. It is bolted to a flange of the corresponding specification, and with a gasket achieves complete sealing, and can permanently plug or temporarily isolate a pipe section. The product is suitable for pipeline systems in petrochemical, power, gas, water treatment, municipal, and fire protection industries, and is a core pressure-bearing pipe fitting for pipeline pressure testing, safety isolation, and engineering acceptance. We provide multiple standards and specifications, and support non-standard customization to meet the needs of different projects.
Key Features
BL blind flange adopts an integral solid forging process, with no sand holes, blowholes, or laminations, high density, strong pressure-bearing performance, resistance to high pressure and impact, and is not prone to deformation or cracking. All series have standard dimensions, precise bolt hole positions, high flatness of the sealing surface, excellent butt-joint sealing performance, and can achieve zero leakage. The product has strong versatility, covers multiple standards and pressure ratings, has sufficient stock reserves, and supports fast delivery. In addition, we provide non-standard customization services, and can produce products of special specifications and materials according to drawings or samples.
Applications
BL blind flange is widely used in petrochemical process pipelines, natural gas transmission pipeline networks, thermal power generation steam pipelines, municipal water supply and drainage engineering, fire protection high-pressure pipelines, sewage treatment equipment pipelines, and pressure vessel port plugging. It is mainly used for sectional pressure testing of pipelines, isolation of new and old pipelines, plugging of reserved spare pipe openings, sealing of idle equipment interfaces, and safety isolation during pipeline maintenance. Whether in indoor plant areas or outdoor pipelines, it can be used stably under high and low pressure and normal-temperature and high-temperature working conditions.
Specifications
The product implements standards such as ASME B16.5/B16.47, GB/T9123, HG/T20592, EN1092-1, etc., with nominal diameters DN15-DN1200, pressure ratings Class150-2500LB or PN6-PN160, and sealing surface forms including RF, FF, MFM, TG, RJ. The product is a solid, non-perforated forged flange cover, using integral forging, heat treatment, precision turning, and non-destructive testing processes. The working temperature varies according to the material: carbon steel is -20℃~425℃, and stainless steel is -196℃~600℃. It is suitable for water, steam, oil and gas, chemical fluids, and corrosive media. Specific parameters can be confirmed according to project requirements.
Purchase & Delivery
We support low minimum order quantity procurement, with the MOQ for conventional specifications as low as 1 piece, meeting the needs of sample testing and scattered replenishment. Commonly used specifications are in stock and shipped within 24 hours; batch orders have a delivery time of 3-7 working days, and non-standard customized orders have a delivery time of 7-10 working days. The product adopts foreign trade export standard packaging, is rust-proof and collision-proof, and supports neutral packaging and LOGO branding. We can assist in confirming the specific delivery time and logistics plan, and welcome you to provide detailed requirements for a quotation.
Service & Support
We provide one-stop after-sales service. All products undergo multiple non-destructive tests and dimensional verification before leaving the factory to ensure quality. If quality problems occur, we support free replacement or return and exchange. We provide selection guidance and technical support to help customers choose the appropriate specifications and materials. For non-standard customization needs, production can be carried out according to drawings or samples. Welcome to contact us to confirm the specific configuration and qualification documents.
FAQ
What is the difference between a blind flange and a pipe cap?
Blind flanges are detachable and are bolted to the mating flange, making them convenient for repeated disassembly and reassembly and for pressure test isolation; while pipe caps usually need to be welded and are a permanent closure that cannot be detached. Blind flanges are more suitable for occasions requiring maintenance or temporary isolation.
Can BL blind flanges be used for high-pressure pressure testing?
Yes. Our blind flanges use an integral forging and thickening process, support Class2500LB ultra-high-pressure pressure testing working conditions, and can meet the pressure testing needs of high-pressure pipelines.
Do you support non-standard customization?
Yes. We can customize non-standard sizes, thickened thicknesses, special sealing faces, and special materials (such as duplex steel, low-temperature steel, etc.) according to customer drawings or samples, and can also perform surface treatment.
Can you provide samples or mixed-batch purchasing?
Yes. We support single-piece sample purchasing, as well as mixed-batch purchasing of multiple specifications and small trial orders, with no mandatory minimum order quantity restriction.
Can you provide the certificates required for export?
We can provide documents such as material certificates and quality inspection reports. For the specific certificate types, please contact us to confirm.
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