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ASTM A182/ASTM A240 F316L/SS316L Blind Spectacle, 8 Figure FLANGE B16.48 for Pipeline
A spectacle blind flange, also known as a figure-8 blind flange, is a type of flange that consists of a combination of a blind flange and a spacer flange. It is primarily used in piping systems to isolate or shut off a section of the pipeline.
Chemical Composition of A182 F316L Spectacle Flanges
| Chemical Composition and Mechanical Property For ASTM A182 | ||||||||||||
| Steel Grade | Chemical Composition | Mechanical performance | ||||||||||
| C(Max) | Si(Max) | Mn(Max) | P(Max) | S(Max) | Ni | Cr | Mo | Tensile Strength (Min) | Yield Strength (Min) | |||
| psi | Mpa | psi | Mpa | |||||||||
| F316L | 0.03 | 1.00 | 2.00 | 0.045 | 0.03 | 10.0–15.0 | 16.0–18.0 | 2.00–3.00 | 495 | 70 | 175 | 25 |
| Ultimate Tensile Strength, ksi | 75 |
| 0.2% Yield Strength, ksi | 30 |
| Elongation, % | 40 |
| Hardness MAX, Brinell | 217 |
Feature of Blind Flange or 8 Figure Flange
1. Design: A spectacle blind flange consists of two metal discs connected by a central section, resembling the shape of a figure-8. One disc is a solid plate (blind flange), while the other has a hole (spacer flange). The central section can be rotated to align either the solid plate or the open hole with the pipeline.
2. Purpose: The main purpose of a spectacle blind flange is to temporarily block the flow of fluid or isolate a particular section of the pipeline for maintenance, repair, or inspection. By rotating the central section, the blind plate can be aligned to block flow, while the spacer plate allows flow.
3. Versatility: Spectacle blind flanges are commonly used in industries such as oil and gas, chemical, petrochemical, and refineries. They can handle different types of fluids, including liquids, gases, and steam, and can be used in high-pressure and high-temperature applications.
4. Installation: Spectacle blind flanges are installed between two flanges using bolts and nuts. When the blind plate is aligned with the pipeline, it is tightened securely to prevent any leakage. During maintenance, the blind plate can be rotated to allow flow, while the spacer plate can be removed if required.
5. Material and Specifications: Spectacle blind flanges are available in various materials like carbon steel, stainless steel, alloy steel, etc. They are manufactured according to recognized industrial standards such as ASME B16.48 and API 590.
6. Safety Measures: It is crucial to follow proper safety measures while installing or removing spectacle blind flanges. Proper pressure relief, isolation, and verification of blind plate alignment are essential to prevent accidents or damage to the piping system.
Application
Oil
Gas
Pipeline
Heat Exchangers
Chemical Industries
Heating Element Tubing
High Temperature Mineral Processing
