Russian process and utility projects rely heavily on GOST standard flanges to match existing Soviet-era and modern CIS piping systems. Haihao Group has completed manufacturing and shipment of GOST 33259-2015 stainless flange for a Russian end-user, combining super duplex 2507 and AISI 304 grades ...

Haihao Group recently completed fabrication and shipment of forged welding neck raised face flanges to our Singapore customer. This batch of ASME B16.5 flange is specially engineered for sour service applications, fully complying with NACE MR 0175 / 0103 requirements to resist sulfide stress cra ...

For oil and gas pipeline assembly in Venezuela, welding neck flanges remain a reliable choice for high-integrity permanent flange connections. Haihao Group has finished manufacturing, inspection and shipment of ASTM A105 ASME B16.5 RF welding neck flange for a Venezuelan client. This batch cover ...

Large-scale energy and pipeline projects in Indonesia often require mixed sets of welding neck, long welding neck and blind flanges with custom hub lengths and varied wall schedules. Haihao Group has completed production and shipment of SA105N ASME RF flange package for an Indonesian client, cov ...

For process piping systems built to European standards in Vietnam, full sets of matching plate and blank flanges are often required for construction, pressure testing and future isolation. Haihao Group has completed production and shipment of a full range of EN1092-1 A105 PN16 flange for a Vietn ...

High-pressure process and utility piping systems across Portugal demand robust, precision-sealed flange connections to maintain leak-free integrity under sustained operating pressures. Haihao Group has completed production and dispatch of A105N RTJ weld neck flange units for a Portuguese industr ...

Pipeline isolation and connection hardware for Russian upstream oil and gas facilities must clear strict benchmarks for low-temperature toughness, sour service durability and alignment with local MESC and DEP engineering standards. Haihao Group has wrapped up fabrication and shipment of a custom ...

Large-diameter pipeline isolation for UAE oil and gas infrastructure demands heavy-duty blind flanges with verified low-temperature toughness and full non-destructive examination. Haihao Group has completed fabrication and shipment of a mixed batch of A694 F65 blind flange and A105N weld neck fl ...

Industrial piping infrastructure projects in France require robust, fully traceable flanges built to ASME B16.5 specifications for stable long-term operation. Haihao Group has finished inspection and shipment of a mixed batch of carbon and alloy flanges for our French client, combining ASTM A105 ...

Low-temperature piping projects across Indonesia’s oil and gas sector often require mixed sets of standard and drawing-specified flanges to match varied pressure classes and pipe schedules. Haihao Group has completed production and shipment of SA350 LF2 CL1 WN flange assemblies for an Indo ...

Precise pipeline isolation and standardized component identification are critical for stable operation of petrochemical and energy piping systems in Singapore. Haihao Group has completed professional fabrication and delivery of custom A350 LF2 spectacle blind flanges, tailored to meet local indu ...

Haihao Group has successfully shipped custom SA694 F65 blind flange units tailored to client drawings for an Indonesian industrial pipeline project. Unlike standard stock flanges, this batch features a full flat face design with no bolt holes, manufactured strictly per custom dimensional and mec ...