Resources
Engineering Reference
Specifying flanges across the full pressure spectrum, from 86 PSI AWWA waterworks fittings up through 20,000 PSI API 6BX wellhead connections, demands more than a parts catalog. The references collected here cover the material used when reviewing bid packages, validating MTRs, and helping engineers confirm that what they drew matches a standard part.
Reference Library
Flange Dimensions
Outside diameter, bolt circle, bolt count, bolt hole size, hub projection, and raised face callouts for ASME B16.5, B16.47, AWWA C207, and API 6BX flanges. Illustrative tables and notes on the dimensional gotchas that trip up first-time specifiers.
CAD Drawings
2D drawings in DWG, DXF, and PDF formats and 3D models in STEP and IGES for weld neck, slip-on, blind, threaded, socket weld, lap joint, and RTJ flanges across the standard pressure classes. How to request a specific size, class, and facing.
Domestic vs Import
Buy American, ARRA, and BABA compliance walked through in plain language, along with the API product specification levels from PSL-1 to PSL-4. When melt origin is contractually binding and how to specify it on your quote request.
Technical Specs
What a complete flange spec sheet looks like, ASME class to DIN PN equivalents, pressure-temperature derating concepts, bolt material selection between B7 and B7M, and gasket compatibility notes for raised face and ring joint geometries.
Calculation Tools
The reference pages above explain what the numbers mean. The tools section gives you a working interface to pull dimensions and calculate torque values without opening a PDF. Each calculator is built around the published standards.
Bolt Torque Calculator
Stud diameter, lubrication factor, and target preload to ft-lbs.
Flange Dimension Calculator
Size, class, and facing lookup with full dimensional output.
Long-Form Technical Articles
The texasflange.com site hosts a deeper library of articles written for engineers, procurement specialists, and field crews. The pieces below are the ones most often referenced from this site.
Understanding Flange Pressure Classes
Class 150 through Class 2500 and why class is not the same as working pressure.
Raised Face vs Flat Face
When to specify each facing and the consequences of mixing them.
Weld Neck vs Slip-On Flanges
Cost, installation, and pressure cycling considerations.
AWWA C207 Waterworks Flanges
Class B, D, E, and F flanges for municipal and water treatment service.
API 6A Wellhead Flanges
6B and 6BX flanges from 2,000 PSI through 20,000 PSI working pressure.
Reading an MTR
Material test reports, heat numbers, and chain of custody for regulated projects.
How to Use These Resources
For a one-off specification check, the dimension and tech spec pages will usually answer the question directly. For active bid work, pull the CAD drawings you need, run the relevant calculator, and confirm domestic versus import requirements before you send the RFQ.
Request a Quote
Send the flange type, size, pressure class, facing and material grade.
Request a Quote