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 ...

The new energy base project in the middle and north of Ordos in Kubuqi Desert (hereinafter referred to as “Kubuqi Base Project”), led by Three Gorges Group and jointly constructed by Inner Mongolia Energy Group, started construction in Dalate Banner, Ordos, Inner Mongolia on August 2 ...

The year 2023 is approaching us with vigor and vitality. In the New Year, Haihao Group will stay true to its original intention and forge ahead, working hand in hand with you to create a better world. Haihao Group

On December 23, the production of large diameter flange ordered by Singapore customers was completed. The diameter of the flange is 3m. The customer placed an order in the middle of this year. In addition to the flange, the order also includes a large elbow. After the packaging of this completed ...

On December 18, the ocean drilling ship, the first ultra deep-water scientific research ship designed and built independently by China for deep-water 10000 meter drilling, realized the main hull penetration in Nansha District, Guangzhou City. Construction of the drillship began on November 30, 2 ...

Recently the Pakistan client send us a tender inquiry for SSGC(Sui Southern Gas Company Limited). The tender including many products, like: ANSI B16.5 Flanges, ASME B16.5 butt weld fittings and fasteners. Weld neck flange WN flange A182 Gr F321 RTJ ASME B16.5 Before we submit the offer, we provi ...