Hebei Haihao Group

  • What’s long weld neck flange (LWN)?

    What’s long weld neck flange (LWN)?

    A long neck flange (LWN) and a welding neck flange have similar features, however, a long neck flange has a slightly longer neck. Long neck flanges on columns and barrels are used as nozzles in many industrial businesses. Equal LWN barrels and heavy barrel ...
  • Meet stainless steel elliptical head

    Meet stainless steel elliptical head

    A stainless steel elliptical head is a product used to plug stainless steel pipes. It is a product used as a container after the pipe has reached its end or two elliptical heads are welded to the two ends of a round pipe. According to the different geometr ...
  • Free insulation joint knowledge for you

    Free insulation joint knowledge for you

    The insulation gasket kit is a specially designed gasket package that use to prevent galvanic corrosion of flange face in a piping system when the material of connecting flanges is different. Here, in the image, you can see the complete kit of insulation g ...
  • How much do you know about Sweepolet?

    How much do you know about Sweepolet?

    Olet fittings are a family of forged products used to make 45 or 90 degrees integrally reinforced branch connections (deviations) from a run pipe (also called header pipe) to a branch pipe (outlet pipe). The common types of branch fittings are Weldolet, Th ...
  • Introduction of nipple

    Introduction of nipple

    The nipple is a kind of fitting commonly used in industrial pipeline connection.There are common screw nipples, which are divided into double head outer thread, single head outer thread and flat head outer thread. In addition, there are also nipples connec ...
  • What are six types of flange gasket?

    What are six types of flange gasket?

    In piping, a gasket is a sealing material placed between the connecting flanges to form a static seal that maintains a leak proof seal under all operating conditions.Different types of gaskets are used to realize leak proof sealing between pipeline flanges ...
  • Knowing these things,the pipe fitting  will not crack

    Knowing these things,the pipe fitting will not crack

    The prevention of cold cracks is mainly caused by reducing the diffusion hydrogen content, improving the structure, and reducing the welding stress. Specific measures are: Preheating before welding and slow cooling after welding. This not only improves the ...
  • What are steel pipe bends?

    What are steel pipe bends?

    Pipe bend has the same function as pipe elbow. But their bending radius are different. The radius of bend is larger than 1.5D, and could be 2D bends, 2.5D bends, 3D bends, 4D bends, 5D bends, and 10D bends. Carbon Steel Pipe Bend are available in ASTM A234 ...
  • What is steel pipe coupling?

    What is steel pipe coupling?

    Steel pipe coupling is a kind of pipe fitting used for pipe connecting in industry,and coupling is a kind of short pipe between two pipes,which also named outer connector.And it is widely used in construction,industry and agriculture industries. And what i ...
  • What is corten steel?

    What is corten steel?

    Corten steel is high strength, low alloy weldable structural steel with exceptional weathering resistance. Corten steel is becoming more popular by roll formed product end-users. Its unique look and naturally oxidizing finish make it especially desirable f ...
  • The basic principle of forming bimetal composite pipe

    The basic principle of forming bimetal composite pipe

    Basic principle of bimetal composite steel pipe: the outer base pipe is responsible for pressure bearing and rigid support of the pipe, and the inner liner pipe is responsible for corrosion resistance, wear resistance and other functions. According to the ...
  • Advantages of bimetal composite pipe

    Advantages of bimetal composite pipe

    Last article we know what are bimetal composite pipes,we know bimetal composite pipes are an economical and reliable new type of pipe.There are the advantages of bimetal composite pipe: Corrosion resistance: it can effectively prevent secondary pollution a ...
  • What are bimetal composite pipes?

    What are bimetal composite pipes?

    Bimetal composite pipes take carbon steel or low alloy steel pipe as base pipe and CRA pipe as layer or lining pipe by patented technology and special equipment.It is a special metallurgical or mechanical process to ensure a tight bond between the base pip ...
  • Production and management of spiral tubes

    Production and management of spiral tubes

    The production of spiral welded steel pipes can show the advantages of high quality and efficiency. The production capacity of a spiral welding pipe unit is equivalent to 5-8 straight seam welded pipe equipment.How to make multiple production lines of pipe ...
  • The main purpose of spiral welded pipe and the difference from straight seam welded pipe

    The main purpose of spiral welded pipe and the difference from straight seam welded pipe

    Spiral welded pipes are widely used in natural gas, petroleum, chemical, electric power, heating, water supply and drainage, steam heating, pressure steel pipes for hydropower stations, thermal power generation, water sources and other long-distance pipeli ...
  • Do you know how to process the surface of stainless steel forgings?

    Do you know how to process the surface of stainless steel forgings?

    Stainless steel has excellent characteristics such as unique strength, high abrasion resistance, superior anticorrosive performance, and resistance to rust. Therefore, it is widely used in chemical industry, food machinery, mechanical and electrical indust ...
  • Do you know the good fittings mean where is good?

    Do you know the good fittings mean where is good?

    When customers call and ask about products, they often say, “i want good fittings, not defective products.” Finished pipe fittings are difficult to distinguish from good or bad quality from the appearance, and they are only known during use. Th ...
  • How to deal with the weld of ERW pipe?

    How to deal with the weld of ERW pipe?

    ERW pipe is made by rolling low carbon structural steel or low alloy structural steel strip into tube blank according to certain helix angle, and then welding the tube seam. It can produce large diameter steel pipe with narrow steel strip. The specificatio ...
  • Good product quality saves purchase costs for customers

    Good product quality saves purchase costs for customers

    Hebei Haihao Group is one of biggest manufacturers specialized in the production of pipes, pipe fittings and flanges. In 2014 we exported 2,000pcs boiler tubes to Portugal. Boiler tubes material is ASTM A179, seamless. At that time we delivered the high qu ...
  • Introduction of liquid applied epoxy lining

    Introduction of liquid applied epoxy lining

    Liquid applied epoxy lining is one important lining type.It has excellent water and chemical resistance properties. They can be applied at various thicknesses and are factory applied to provide a dielectric lining. Bonded dielectric lining systems can be a ...