Glass steel pipe and ordinary steel pipe comparative analysis

Steel pipe is a traditional pipe by spiral wound steel plate welded into a cylindrical post. From the strength and stiffness of view, sand glass pipe and ordinary steel pipe have excellent characteristics.

But in terms of corrosion resistance and service life, hydraulic characteristics, energy, water, transportation, installation, and price analysis, the ratio of Fiberglass Reinforced Plastic Pipe superior, more competitive.

Strength properties

FRP pipe has excellent strength properties, the maximum allowable working pressure up to 6.4MPa, design safety factor of more than 6 times. Tensile strength: According to the laying of the fiber content, the apparent ring to the glass pipe in l40-520MPa tensile strength between the axial tensile strength can be between 70-320MPa; bending strength: According to the fiber laying and content, the apparent glass pipe hoop bending strength can be between 154-340MPa. Only the nozzle is flexible interface, but also the flexible tubing. Impact strength: glass pipe with good impact strength, as 300kgf ² cm/cm2 above, there are tests showed: the Φ2600 glass pipes free fall from a height of 1.8m were no damage;


In the stiffness of performance, both of which can meet the engineering needs. FRP pipe is subjected to bending stresses in the wall of a small increase in the intermediate layer according to project needs to increase the stiffness of the sand layer, which can meet the requirements of any user of the proposed stiffness. Pipe stiffness itself is large enough, can not be considered. (Eg trucks), the glass pipe can withstand short-term accident to bear loads in super elastic deformation by itself, and after the load is removed automatically restitution; while the pipe at a certain shear deformation easily be damaged or fracture.

Hydraulic characteristics

Inner wall of the glass tube is very smooth, the new glass pipe of Hazen-Wllliams roughness coefficient C is 160 a 165, its conservative design value (50 years) is 150. The new steel pipe C values ​​are 120, after the use of C = 65. Reduce the value of C is due to the inner surface of the tube to produce iron molecule oxidation and electrochemical corrosion is reflected in the inner wall of the fouling caused. Steel and glass pipe flow of comparable data. Because the new pipe absolute roughness of 0.05mm, absolute roughness after etching of the tube is 3mm, the etching is not an absolute roughness of the etching pipe 60 times.

Structure and production processes

GRP pipe inner surface is composed of a high proportion of unsaturated polyester resins and reinforced impermeable layer of material, and then untwisted hoop and cross-alkali glass fiber and resin layer wound. Living wall quartz sand throughout central position, which has multi-ring and E untwisted to cross-wound glass fiber connections and enhance the role play. The outer ring and the cross-E remains untwisted fiberglass and resin layer wound. Fiber production process in order to give sufficient tension and forming compacted layer by layer, so that the whole wall structure seamless. Higher thermal conductivity of steel, with anti-corrosion material deformation coefficient difference between the larger, external localized corrosion, water and other factors impact the role easier to peel.

Related Seamless pipes :

Weled steel pipe specification, Standard and identification

Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.