Flanges are external ridges on beams or pipes that allow them to be attached to other objects. In the process industries, flanges are most often important in the context of pipelines and piping. Sections of pipe are able to weld together at these flanges; allowing for easier transportation, assembly, installation, and/or disassembly than if they constructed as one big section. By making them easier to disassemble, maintenance, inspection, and cleaning activities can be conducted without affecting large portions of the pipe system.
Some of the most common types of flanges in the industry are welding neck flanges, slip on flanges, socket weld flanges, lap joint flanges, threaded flanges, and blind flanges. They made of a number of different materials such as stainless steel, cast iron, aluminium, brass, bronze, or plastic, among others. Usually the flange material is the same as the pipe itself.
Most of flange purchasers buy flanges that have already been manufactured and there is no chance to witness above inspection and tests. In this case, your TPI must pay more attention to the review of quality control records and test reports. Our qualified inspection engineer performed inspection based on reference standards of ASME II , V , VIII , IX , ASME B31.1, B31.3, B16.5, DIN, AS/NZ standards etc.
Best Practice Recommendations:
- A visual test performed to identify cracks, surface porosity and open structure defects.
- A dimensional inspection performed to confirm that the different flange (Types of flanges are; Slip on, Blind, Weld Neck, Threaded, Socket Weld, Lap Joint and Orifice) manufactured according to the ASME Specficition, that specifies the dimensions and indicates the design tolerances.
- A tensile test performed to test the tensile strength, the yield strength, and the elongation restrictions.
- A hardness test performed to test surface hardness and micro-hardness to confirm the material performance and acid environment performance.
- Magnetic particle inspection is to detect locating surface and near subsurface discontinuities in ferromagnetic materials, if some surface cracks, folds, thrust fault, pit or gas hole.
World Class Quality Service for Flange inspection include:
- Quality Assurance/Quality Control
- Technical Inspection
- AUTO CAD
- Vendor Audits
- Non-Destructive Testing
- Laboratory Test Services
- Document Control
- Welding and NDT Procedures