In industrial pipeline systems, spectacle blinds play a vital role in system isolation for maintenance, testing, or safety shutdowns. When manufactured from ASTM A240 Grade 316/316L stainless steel, these components offer excellent corrosion resistance, mechanical durability, and compatibility w ...

In 2025, Haihao Group successfully completed the production and quality inspection of stainless steel spectacle blinds for a valued client in Singapore. These critical flow-control components were manufactured from ASTM A240 Grade 316/316L stainless steel and in full compliance with the ASME B16 ...

At Haihao Group, we understand the precision demands of global engineering procurement teams. When Singapore’s leading energy infrastructure contractor approached us for ASME B16.48 ASTM A240 GR. 316 spectacle blind flanges, our engineering team prioritized material integrity, dimensional ...

Haihao Group specializes in manufacturing industrial flanges that adhere to the most rigorous international benchmarks, with our ASME B16.5 A105N RF weld neck flanges standing as a testament to our dedication to precision engineering. These flanges are engineered to deliver exceptional performan ...

Haihao Group, a global leader in industrial flanges and pipeline products, has successfully fulfilled a high-specification order for ASME B16.5 ASTM A694 F65 and A350 LF2 CL1 weld neck flanges (1″ & 3″, 600# & 2500#) for a Singaporean client. Key Technical Specifications Materials: A694 ...

If you are involved in the construction of refineries and petrochemical plants,high-temperature and high-pressure pipelines are the norm. These systems transport critical fluids such as crude oil, steam, and process chemicals under extreme operating conditions. Ensuring a reliable, leak-free con ...

Haihao Group, a comprehensive service provider integrating industry and trade, offers one-stop solutions. Recently, we fulfilled an order for EN 1092-1 RF weld neck flanges in dimensions ranging from 40 to 150 millimeters, with a pressure rating of PN16 and made from P355QH1 material, for a Mala ...

Haihao Group has successfully completed the production and delivery of a batch of API 6A WN Flange RTJ 10,000 PSI SAE 4140 products for a valued client in Argentina, reinforcing our commitment to supplying high-performance flanges for demanding oil and gas applications. Product Overview This shi ...

An In-Depth Look at High-Performance Flanges Made from UNS N06625 In offshore oil fields and high-sulfur (H₂S) wellhead environments, traditional carbon steel flanges often suffer premature failure due to severe corrosion. As a result, nickel-based alloy flanges, especially those made from ASTM ...

At Haihao Group, our commitment to quality and compliance is reflected in every order we deliver. Recently, we completed a custom order for a Singaporean client, supplying high-performance RTJ WN flanges and swage nipples in Nickel Alloy ASTM B564 and B366 UNS N06625, fully compliant with NACE M ...

Following a successful March delivery of 15x5M alloy seamless elbows and reducers, Haihao Group received two new flange orders from the same Russian client in April. The repeat orders confirm the client’s trust in Haihao’s strict quality control, precision manufacturing, and reliable ...

Haihao Group has recently completed an order of ANSI B16.5 F316L blind flanges and ASME B16.20 316L spiral wound gasket for a client. The flanges are made of 316L material and are available in sizes of 2, 3, 4, and 6 inches. They have thickness options of 150# and 300#. The gaskets, also made of ...