The APPLUS VELOSI inspector visited HEBEI HAIHAO HIGH-PRESSURE FLANGE & PIPE FITTINGS GROUP CO., LTD on Jan.13, 2023 to perform final inspection for ASTM A182 316/316L, ASTM A350 Gr.LF2 weld neck flanegs and blind flanges at the end of the article, including visual, dimension, marking, color ...

Haihao Group recently supplied a range of top-quality flange products. These products include ASTM A350 Gr.LF2 Cl.1 ASME B16.5 weld neck flanges, ASTM A182 316/316L ASME B16.5 RF weld neck flanges, ASTM A350 Gr.LF2 Cl.1 ASME B16.5 RTJ blind flanges, ASTM A182 Gr.F304/304L ASME B16.5 RF blind fla ...

In mid-March, ASME B16.47A ASTM A105 weld neck flanges and blind flanges ordered by Saudi customers were shipped. The customer expressed great satisfaction with the quality of the products after receiving the goods. Due to the needs of the project, the customer needs to purchase a batch of AWWA ...

As an enterprise dedicated to providing customers with one-stop pipeline engineering products and services, Haihao Group not only has rich pipeline supporting products, but also has the ability to provide customers with coating treatment and engineering solutions. Today, epoxy coating is widely ...

Due to the sulfur element and acidic substances contained in the pipeline, the corrosion of petrochemical pipeline is also inevitable. Now Haihao shares with you several common causes of petrochemical pipeline corrosion. flanged steel pipe 1.Oxygen absorption corrosion of steel caused by primary ...

There are two types of bolts used to connect flanges: single-head bolts and double-head bolts. Their threads are generally triangular metric coarse threads. Let’s take a closer look at these two products. Single-head bolts are also known as hexagon-head bolts. Single-head bolts can be divi ...

The function of blind flange is to cut off the medium in the pipeline, which can be divided into the following types according to the use pressure and the form of sealing surface: ANSI B16.5 ASTM A182 F304 blind flange 1.Smooth face blind flange is used with smooth sealing face flange, and its a ...

Leakage is the main form of pipe flange failure, which is related to many factors such as the type of sealing structure, the stiffness of the connected parts, the performance of the seal, operation and installation. The gasket is the main seal of the flange connection, so the correct selection o ...

Not long ago, Haihao received an inquiry from the customer about the wind power flange. After many times of communication, the customer finally decided to order the flange product from the customer. After confirming the cooperation, the customer recognized Haihao’s professionalism and aske ...

Endeavour for 40 years, passion for the future. In 1982, Hebei Haihao Group officially established its factory in Mengcun County, the hometown of pipe fittings in China. From a few people to more than 700 people, Haihao has always put product quality and service first. Now Haihao Group has devel ...

As a professional manufacturer and operator of pipeline engineering supporting products, Haihao sometimes encounters the situation of expediting delivery for customers. On January 10, a batch of flanges ordered by Russian customers completed production and were packed for shipment. The customer& ...

The natural environment is a major problem affecting the operation and maintenance work, which will directly affect the time to sea, such as typhoon days, fog days and other special weather, and the time to sea will be reduced. In addition, the transportation equipment of offshore wind power is ...