ANSI Class 150 Forged Pipe Flanges

The 150 marking identifies the flange’s Class 150 pressure-temperature category under the applicable ASME flange standard. It does not mean the flange is universally rated for 150 PSI in every service condition. Material and operating temperature affect the allowable rating, so the flange marking should be checked against the project specification and piping design requirements.

A 4-inch Class 150 flange commonly follows the bolt-hole pattern specified by the applicable ASME dimensional standard. The exact count should be verified against the required flange type, standard, and product documentation before ordering. Twinco Industrial can help confirm the bolt pattern along with flange face, material, and connection details.

An ANSI #150 flange is a common industry term for a flange manufactured to the Class 150 dimensional and pressure-temperature requirements associated with ASME flange standards. Available configurations can include weld neck, slip-on, blind, lap joint, socket weld, and threaded designs. Selection should account for material, size, face type, and piping service.

Product information lists carbon steel, stainless steel, alloy steel, duplex, and nickel alloys across the available flange offerings. Material selection should match the piping specification, fluid service, temperature, corrosion requirements, and applicable project standards. Availability may vary by flange type, size, and whether the item is purchased or rented.

The product range includes weld neck, slip-on, blind, lap joint, socket weld, threaded, and API flange options. Rental blind flanges are also available with face options including raised face, flat face, RTJ, and seal ring groove. Confirm the required connection, facing, dimensions, and standard when requesting a quotation.

The available product information identifies both rental and purchase options across the flange range. Rental blind flanges are offered for applications such as hydrostatic testing, vessel and process system isolation, maintenance shutdowns, and turnarounds. Contact Twinco Industrial with the required size, material, face, quantity, and application to identify the appropriate option.