Most spectacle blinds provided by SWECO® are defined by ASME Standard B16.48. B16.48 replaces API Standard 590* which is now obsolete. Additionally, line blinds are defined under other standards such as ASME B31.1, ASME B31.3, and Section VIII, Div 1, UG-34.
Thickness, outside diameter and bore diameter of B16.48 line blinds exactly match the pressure ratings and sizes of ASME B16.5 flanges which cover the Nominal Pipe Size (NPS) range from 1/2 inch through 24 inch. The pressure ratings are all defined and the line blinds are defined in raised face as well as both male and female RTJ configurations.
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In piping systems, the efficiency and safety of process systems depends on specialized components such as spectacle and line blinds. These versatile devices play a key role in regulating fluid flow, isolating pipeline sections and facilitating maintenance activities. Spectacle blinds and line blinds are integral components in the tool kit of fluid control and pipeline maintenance engineers. Spectacle blinds, characterized by a characteristic figure eight or spectacle-shaped design, consist of a solid plate and a ring-shaped spacer. Line blinds, on the other hand, work like movable plates inside the piping system, capable of isolating sections of piping or redirecting fluid flow.
The effectiveness of spectacle and line blinds comes from their design. Spectacle blinds, with their figure-eight configuration, provide a simple means of blocking flow, preventing leaks and ensuring safety during maintenance or shutdown. The ring-shaped spacer, when rotated, alternates between open and closed positions, allowing seamless control of fluid flow. Their precise engineering allows for quick and precise adjustments, making them indispensable in processes that require frequent changes in fluid paths.
Spectacle and line blinds find a variety of applications in all industries where fluid control and pipe insulation are essential. In petrochemical plants, spectacle blinds are used during maintenance activities to ensure the safety of personnel and equipment. In the chemical industry, line blinds play a key role in regulating the flow of various chemical substances within the processing system.
Sveco offers a comprehensive range of spectacle and line blinds that are tailored to meet the exacting requirements of various industries. Their commitment to precision engineering is evident in the diverse product line displayed on their website. The blinds are designed with durability, reliability and ease of use in mind, reflecting the company’s commitment to providing state-of-the-art solutions to fluid control challenges.
Spectacle and line blinds have several advantages over traditional flow control mechanisms. Their ability to provide a complete seal during maintenance or shutdown minimizes the risk of leaks and provides a safer working environment. The precision and ease of operation of these shutters contribute to the efficiency and reliability of the fluid control system.