Haihao Group Ships ASTM B564 UNS N06625 Sour Service Flanges to Singapore

Sour gas piping systems in Southeast Asia demand strict material verification and non-destructive testing, and this batch of ASTM B564 UNS N06625 sour service flanges was produced to meet the rigorous specification of our Singapore client. Haihao Group finished machining, testing and packing this nickel alloy package, combining welding neck flanges, blind flanges and custom pup joints for a corrosive process line.

All WN and blind flanges follow ASME B16.5, Class 600, raised face finish, forged from ASTM B564 UNS N06625 for sour service duty. The package also includes custom pup joints manufactured to ASTM B444 UNS N06625 Gr.1, sized 100 mm length with mixed S-10S and S-40S wall thickness, built against supplied engineering drawings. Every ASTM B564 UNS N06625 sour service flange and pup piece passed the mandatory full inspection scope required by the project.

ASTM B564 UNS N06625 sour service welding neck and blind flanges, ASTM B444 pup pieces, packed for Singapore project, 100% PMI UT PT tested

The testing package is the key differentiator for this sour service order: 100% direct-reading PMI confirms alloy chemistry, 100% ultrasonic inspection checks for internal forging and pipe body flaws, and 100% penetrant testing identifies any surface discontinuities. Many alloy suppliers only perform spot checks on high-nickel components, but the Singapore specification leaves no room for sampling, and we executed full traceable records for every ASTM B564 UNS N06625 sour service flange in this shipment.

UNS N06625 (Alloy 625) is selected for sour environments because it resists chloride cracking and sulphide stress corrosion better than common stainless grades. Our workshop handled the tight machining tolerances for RF flange faces and prepared the pup joints exactly as per SP-220 and SP-223 drawing requirements. We can also consolidate mixed CRA packages, arrange third-party witness inspection and issue complete MTCs compatible with Singapore oil & gas project documentation standards.

If you are sourcing ASME B16.5 sour service nickel alloy flanges, or custom ASTM B444 pup joints with full NDE and PMI requirements, send your drawing and inspection datasheet to our technical team. We support fast quotation and controlled documentation for critical CRA piping packages.