FLANGE PN GUIDE

Overview

The Flange Part Number Guide explains the complete logic behind identifying, decoding, and validating stainless steel and alloy flange part codes. This includes weld-neck, slip-on, blind, threaded, lap-joint, and plate flanges per ASME B16.5 and industry standards. This guide ensures engineers, fabricators, OEMs, and installers select the correct flange rating, bore, material, and finish for mission-critical process systems.

Applications

Flange selection for industrial, sanitary, and OEM piping systems
Engineering calculations involving bolt torque, gasket load, and flange stress
Identifying bore type and raised-face configurations
Fabrication of process skids, manifolds, and spool assemblies
Regulated industry QA documentation and material traceability
Hobbyist projects involving high-pressure stainless pipe builds

Technical Structure & Interpretation

Flange part numbers incorporate multiple technical attributes that determine the flange’s structural, pressure, and compatibility characteristics:

Flange Type Code: WN (weld neck), SO (slip-on), BL (blind), THD (threaded), LJ (lap joint), PL (plate)
Rating / Pressure Class: 150#, 300#, 600#, 900#, 1500#, 2500#
Bore / Facing: Standard bore, XS/XXH bore, RF (raised face), RTJ (ring-type joint), FF (flat face)
Material Grade: 304/304L, 316/316L, Duplex, Nickel alloys
Specifications: ASME B16.5, MSS SP-44, API, custom machining
Finish Options: Serrated, smooth, polished

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Industries Served

Oil & Gas
Chemical & Petrochemical
Food & Beverage Processing
Pharmaceutical & Biotech
Water Treatment & Filtration
Power Generation
OEM Skid Manufacturing

Integration & Workflow

Engineering Review: Confirms flange compatibility with pipe schedule and process pressures.
Fabrication Planning: Weld-neck and slip-on flanges are prepped for spool assembly.
Installation QA: Torque values, gasket type, and bolt loading verified per ASME.
Documentation: All flanges ship with full MTRs and material confirmation.
Hobbyist Builds: Provides simplified flange identification for small stainless projects.

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