Product Selection

ASME B16.1 Flanges: Gray Iron Classes and Matching

ASME B16.1 Flanges: Gray Iron Classes and Matching

ASME B16.1 flanges are gray iron pipe flanges and flanged fittings within the standard's stated Class 25, 125, and 250 scope. The standard covers more than bolt patterns. Its scope includes pressure-temperature ratings, materials, dimensions and...

Jul 27, 2026
ASME B16.47 Flanges: Series, Classes, and Purchasing

ASME B16.47 Flanges: Series, Classes, and Purchasing

ASME B16.47 flanges are large-diameter steel pipe flanges covered within the standard's stated NPS and pressure-class scope. A usable purchase description must identify the standard edition required by the contract, nominal pipe size, rating...

Jul 27, 2026
Blind Flange: Selection, Pressure Boundary, and Inspection

Blind Flange: Selection, Pressure Boundary, and Inspection

A blind flange closes a flanged opening without a center bore. It can terminate a line, close a vessel or valve connection, or provide an access point that can be opened later. Because the full pressure load acts on the solid plate, the correct standard,...

Jul 25, 2026
Flange Size Chart: How to Select the Correct Standard Table

Flange Size Chart: How to Select the Correct Standard Table

A flange size chart is useful only when it identifies the dimensional standard, edition, nominal size, rating, flange type, and facing. There is no single universal chart for every flange. The same nominal pipe size can have different outside diameters,...

Jul 25, 2026
How to Measure Flange Size: OD, Bore, and Bolt Circle

How to Measure Flange Size: OD, Bore, and Bolt Circle

To learn how to measure flange size, record several dimensions rather than relying on one diameter. The minimum useful set is flange outside diameter, bore or inside diameter, bolt-circle diameter, bolt-hole diameter, number of holes, flange thickness,...

Jul 25, 2026
Lap Joint Flange: Stub End Matching and Inspection

Lap Joint Flange: Stub End Matching and Inspection

A lap joint flange is a loose backing flange used with a lapped stub end. The stub end is welded to the pipe and provides the sealing face, while the backing flange supplies the bolting load. Because the backing flange can rotate before tightening,...

Jul 25, 2026
Orifice Flange: Tapping, Alignment, and Inspection Guide

Orifice Flange: Tapping, Alignment, and Inspection Guide

An orifice flange is designed to hold an orifice plate and provide pressure-differential connections for flow measurement. The flange pair, pressure taps, orifice plate, gaskets, bore, and upstream/downstream orientation must be treated as one measurement...

Jul 25, 2026
Raised Face Flange: Gasket Contact and Selection Guide

Raised Face Flange: Gasket Contact and Selection Guide

A raised face flange has a gasket seating area raised above the surrounding bolting plane. This geometry concentrates the bolting load on a defined gasket contact area. The facing dimensions, surface finish, gasket type, material, rating, and mating...

Jul 25, 2026
Slip-On Flange: Fit-Up, Welding, and Purchasing Guide

Slip-On Flange: Fit-Up, Welding, and Purchasing Guide

A slip-on flange slides over the pipe and is normally attached with fillet welds. It is widely used because fit-up is straightforward and the flange can be positioned before welding. Correct selection still requires the standard, size, rating, material,...

Jul 25, 2026
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