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 ...

Haihao Group recently completed production and quality inspection for a high-pressure 2″ 600# RTJ Sight Glass (Part No. 24-sG-9007) for one of our valued international clients. Designed for high-performance fluid monitoring systems, this robust sight glass is engineered for reliability in ...

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 ...

Haihao Group recently completed an order of ANSI B16.5 ASTM A105 RF weld neck flanges for a client in Hong Kong. These flanges are made to the ANSI B16.5 standard and use ASTM A105 material. They come in sizes of 8 and 12 inches, with a 150LB pressure rating and SCH40 schedule. The total length ...

Haihao Group has just wrapped up an order of ASME B16.47 SERIES A ASTM A350 GR. LF2 CL1 RF weld neck flanges for a client in Singapore. These flanges are made to the ASME B16.47 SERIES A standard and use ASTM A350 GR. LF2 CL1 material. They have an outside diameter of 38 inches, a thickness of 0 ...

Haihao Group just finished an order of ГОСТ 33259 12Х18Н10Т/AISI321 RF weld neck flanges for a Latvian client. The flanges are made to the ГОСТ 33259 standard and use 12Х18Н10Т/AISI321 material. They come in sizes from DN200 to DN400 and have a PN16 pressure rating. The 321 grade material has th ...

Flanged connections are essential in piping systems that require secure, detachable joints. They allow for easier maintenance, inspection, and replacement of components. However, not all flanges are the same. In this article, we’ll explain the most common flange face types: Flat Face (FF), Raise ...