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A raised face flange is the most widely used flange facing for industrial piping systems. The raised sealing surface is designed to concentrate the gasket load onto a smaller area, creating a reliable seal between two bolted flanges. PipingMarket.eu supplies a wide range of raised face flange solutions in different materials, pressure classes and dimensions for standard and project-specific applications.
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What is a raised face flange?
The defining feature of a raised face flange is the slightly elevated sealing surface surrounding the bore of the flange. When the flange is bolted together with a suitable gasket, the raised face concentrates the bolt load, reducing the risk of leakage. The height of the raised face depends on the pressure class. According to ASME B16.5, Class 150 and Class 300 flanges typically have a raised face of 1.6 mm (1/16"), while Class 400 and above generally feature a height of 6.4 mm (1/4").
What are the benefits?
The popularity of the raised face flange is largely due to its balance between sealing performance and ease of installation. Key advantages include:
- improved gasket compression;
- reliable sealing under varying operating conditions;
- compatibility with a wide range of gasket materials;
- suitability for numerous pressure classes;
- availability in many materials and flange sizes.
Typical applications
A raised face flange is commonly installed on piping systems carrying liquids, gases and steam under low, medium and high-pressure conditions. Typical applications include process piping, refineries, offshore installations, chemical plants, power stations and general industrial facilities. They are also regularly specified for equipment connected to cylinder tubes where reliable sealing performance is essential. The facing can be manufactured on numerous types of flanges, allowing engineers to select the most appropriate flange design without compromising sealing performance.
Related flange solutions
A raised face can be combined with several flange configurations, including:
- threaded flanges for systems where welding is not preferred;
- socket welding flanges for small-diameter, high-pressure piping;
- lap joint flange assemblies requiring regular dismantling;
- long welding neck flanges for critical pressure applications;
- swivel flanges for offshore and subsea installations;
- A694 F65 flanges for high-strength pipeline systems.
Source raised face flange solutions
Whether you require standard raised face flanges or other piping products, submit your technical specifications through our online RFQ platform. Our specialists review your material grade, pressure class, dimensions and project requirements to help source the most suitable solution through our international supplier network. We support standard requirements and project-specific sourcing.
