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Blind flanges, an integral part of piping systems, play a crucial role in ensuring safety and flexibility. These flanges provide a reliable closure to pipelines, preventing leakage and controlling the flow. Understanding the benefits, various types, specifications, and standards associated with blind flanges is essential for informed decision-making in engineering projects.
Blind flanges offer several advantages in piping systems, making them a preferred choice for engineers and manufacturers. Key benefits include effective closure, prevention of leakages, and adaptability to different pipe sizes. These flanges provide a secure and versatile solution, ensuring the integrity and safety of the overall system.
Understanding the different types of blind flanges is crucial for selecting the right fit for diverse industrial needs. Common types include standard blind flanges, spectacle blind flanges, and slip blind flanges. Each type possesses specific characteristics that make it suitable for particular applications. These types are:
Raised face blind flanges are the most commonly used type of blind flange. A raised face is on the flange’s face that sits against the pipe. It provides support when the flange bolts are tightened, thus preventing leakage. These flanges are ideal for low-pressure systems and cost-effective compared to other blind flanges.
Ring joint blind flanges are designed to be used in high-pressure systems. They are made with a ring groove machined into the flange’s face, which holds a metal gasket in place. These flanges feature a more substantial wall and are used in applications that demand higher pressure or temperature ratings.
Flat-face blind flanges do not have any protrusions on their face. As a result, they are perfect for low-pressure systems. Gaskets are used to seal the flange, and it maintains a smooth appearance, making it ideal for projects that require a neat finish.
Weld neck blind flanges have a long tapered hub welded to a pipe. They are used in high-pressure applications such as steam or gas pipelines. The flange has a thickness similar to the pipe, ensuring a smooth transition between the pipe and the flange. Weld neck blind flanges are expensive but offer optimal functionality and are worth the investment.
Close nipple blind flanges are short stubs that fit onto the end of a pipe. They are used in low-pressure systems and can be easily installed. These flanges are inexpensive, and their installation costs are also low.
Selecting the right blind flanges involves considering specifications such as materials, pressure ratings, and sizes. The table below provides key details, aiding in the selection of blind flanges for different applications.
| ASME B16.5 Blind Flange Size Chart | 1/2" (15 NB) to 48" (1200NB) DN10~DN5000 |
| Rtj Blind Flange Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092 |
| Pn16 Blind Flange Pressure Calculation in DIN | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 Blrf Flange |
| JIS | 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K Pn16 Blind Flange |
| UNI | 6Bar 10Bar 16Bar 25Bar 40Bar Rtj Blind Flange |
| Blrf Flange Pressure Rating ANSI | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS Blind Flange Raised Face |
| EN | 6Bar 10Bar 16Bar 25Bar 40Bar Class 300 Blind Flange |
| Most common types of Carbon Steel blind flange | Forged / Threaded / Screwed / Plate |
| Test Certificates | EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc |
| Production technique | Forged, Heat treated and machined |
| Coating | Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized Blind Flange |
| Connect Type/ Flange Face Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove |
| Special design | As per your drawing AS, ANSI, BS, DIN and JIS 15 NB (1/2") to 200 NB (8") Equal and Reducing Configurations |
| Test | Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector |
| Equipment | Press machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc |
| Manufacturer of | ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc.
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Blind flanges adhere to specific standards and grades to ensure quality and compatibility. It is essential to choose flanges that meet industry standards for optimal performance and safety.
Apex Engineering stands as a reliable supplier of blind flanges, offering clients a combination of extensive industry experience, high-quality products, and a customer-centric approach. Our commitment to timely delivery and comprehensive support makes us the preferred choice for blind flange solutions.
A blind flange serves as a solid disk used to block off a pipeline or to create a stop. It is a crucial component when a temporary or permanent closure is needed, preventing the flow of fluids and ensuring safety in piping systems.
Blind flanges find applications in various industries where the closure of a pipeline is necessary. Commonly used in situations requiring temporary or permanent seals, such as during maintenance or when a specific section of the pipeline is not in use.
This comprehensive guide provides insights into blind flanges, covering their benefits, types, specifications, standards, and why Apex Engineering is the preferred supplier. For further inquiries or assistance, feel free to contact us.
