4" ANSI Class 150 Pipe Flanges

Check the flange markings, documentation, dimensional details, and applicable standard. Class 150 and Class 300 flanges can differ in thickness, outside diameter, bolt pattern, and pressure-temperature ratings. Confirm the nominal size, material, face type, and standard before installation. Twinco Industrial offers ASME pressure classes including 150 and 300 across multiple flange types.

Dimensions for a 3 inch Class 150 flange depend on the flange type and applicable ASME standard. Verify the outside diameter, thickness, bolt-circle diameter, bolt-hole details, bore, and face dimensions against the required specification. Do not substitute dimensions from another class or flange style without confirming compatibility with the piping system.

Available flange types include Weld Neck, Slip-On, Blind, Lap Joint, Socket Weld, Threaded, and API options. The appropriate type depends on the connection design, pressure-testing or isolation requirement, fabrication method, and piping configuration. Confirm the required face style, material, standard, and quantity when requesting a quote.

Material options include Carbon Steel, Stainless Steel, Alloy Steel, Duplex, and Nickel Alloys across the supplied flange range. Material selection should follow the piping specification and account for service conditions, compatibility, temperature, corrosion requirements, and applicable documentation. Provide the required material grade or project specification so the correct option can be identified.

Twinco Industrial offers rental and purchase options for flange products. Rental can support hydrostatic testing, temporary isolation, maintenance, inspection shutdowns, turnarounds, and construction activities, while purchase supports permanent piping requirements. Availability and suitability vary by flange type, size, pressure class, material, and order requirements.

The product range references ASME B16.5, ASME B16.47 Series A and B, the broader ASME B16 Series, and API standards. The correct standard depends on the flange size, type, rating, and project specification. Review markings and documentation before installation to confirm that the flange matches the design and inspection requirements.