ASME B16.5 & B16.48 duplex and carbon steel flange package for Pakistan gas project
Haihao Group has completed fabrication, inspection and shipment of a mixed flange and spectacle blind set for our Pakistan client. This supply bundle combines weld neck RTJ flange, NACE compliant RJ spectacle blind and RF paddle blind, built to match sour gas and general piping isolation requirements on-site.
This ASME B16.5 & B16.48 duplex and carbon steel flange package covers different pressure classes and sealing face designs to suit separate piping loops. The 8 inch Class 900 WN RTJ flange is supplied to ASME B16.5, forged from ASTM A182 F51 duplex stainless steel with SCH 80 matching pipe schedule, engineered for high-pressure process connections.
A key component within this ASME B16.5 & B16.48 duplex and carbon steel flange package is the 2 inch Class 900 RJ spectacle blind. It is manufactured from ASTM A240 UNS S31803 duplex stainless steel and fully aligned with NACE sour service requirements. The ring joint face provides reliable sealing under fluctuating pressure, an essential feature for sour hydrocarbon lines common across Pakistan’s gas infrastructure.
ASME B16.5 B16.48 flange and spectacle blind set, A182 F51 RTJ weld neck flange, UNS S31803 NACE spectacle blind, A516 Gr60 paddle blind
Completing this ASME B16.5 & B16.48 duplex and carbon steel flange package is the 12 inch Class 300 RF paddle blind made from ASTM A516 Gr.60 carbon steel to ASME B16.48. This RF paddle blind serves straightforward isolation duties on non-sour utility lines, balancing project cost while keeping dimensional and marking compliance consistent with the rest of the flange set.
Pakistan gas sector EPCs often face delays when sourcing mixed isolation and connection fittings, as many suppliers can only offer standard carbon steel blinds without NACE-qualified duplex spectacle blinds. We verify material certificates, sealing face machining and NACE compliance separately for duplex items, so all documentation can be submitted together for client or third-party approval.
If your project requires a matched ASME flange and spectacle blind assembly, including duplex NACE sour service spectacle blinds or forged RTJ flanges, send your technical datasheet to our team for a complete quotation with full material compliance records.