ASTM B564 UNS N06626 Sour Service WN Flanges ASME B16.5 Shipped to Singapore

This shipment to our Singapore client is a full set of sour service weld neck flanges built to ASME B16.5 Class 600, forged from ASTM B564 UNS N06625. The package covers a wide size range from 1.5 inch up to 18 inch, including a special long weld neck flange that requires custom drawing control. This ASTM B564 UNS N06625 ASME B16.5 flange is specified for sour gas environments, where resistance to sulphide stress cracking is a non-negotiable requirement for the Singapore offshore and refining sector.

Every ASTM B564 UNS N06625 ASME B16.5 flange in this batch goes through three mandatory non-destructive checks as requested: 100% direct-reading PMI, 100% UT and 100% PT. Direct PMI confirms the nickel alloy composition on every single flange surface, ruling out material mix-up for high-risk sour service lines. Ultrasonic testing checks for internal forging discontinuities, while penetrant inspection finds surface cracks that could propagate under cyclic pressure and corrosive gas exposure. Our QC team logs each test result against the heat number, so this ASTM B564 UNS N06625 ASME B16.5 flange can be fully traced at any point during site acceptance.

ASTM B564 UNS N06625 Class 600 RF weld neck flanges, long WN flange for Singapore sour service piping project

The flange lineup mixes standard schedule wall thicknesses: S10S, S20, S40S and the special 15.85 mm bore on the 1.5-inch long WN unit. All are raised face (RF) finish with butt weld ends, matching the ASME B16.5 dimensional envelope. The long weld neck variant is manufactured strictly following the buyer’s drawing, with extra control on hub length and transition profile, a detail that many alloy flange suppliers overlook when handling custom sour service packages.

Singapore EPC contractors working on sour gas and process systems often select ASTM B564 UNS N06625 ASME B16.5 flange because of its stable performance in chloride and H₂S containing streams. Unlike standard carbon steel, this nickel alloy retains ductility and cracking resistance even when pressure swings and corrosive media act together. Consolidating multiple sizes into one shipment also helps the client simplify receiving and inventory management for fast-track project schedules.

All marking, sealing face protection and packaging are completed after NDT clearance. We prepare full documentation packages including PMI spectra, UT scan records, PT inspection sheets and material test certificates, formatted to meet local third-party inspection standards common in Singapore. Each flange is individually protected to prevent scratches on the raised sealing face during transit.

If you are sourcing sour service nickel alloy flanges for Singapore or Southeast Asian oil and gas projects, and require full 100% PMI, UT and PT inspection, send your flange schedule, pressure class and drawing requirements to our engineering team. We support standard and custom long weld neck designs for UNS N06625 and other corrosion-resistant alloy grades.