Hollow steel sections (HSS) exhibit superior resistance to bending and torsional loads due to several mechanical properties:
1. Moment of Inertia:
The moment of inertia, denoted as ‘I’ in mechanics, is a measure of an object’s resistance to changes to its rotation. It is dependent on both the mass of the object and its distribution of mass around the axis of rotation. For a structural element, the axis of rotation is typically its neutral (centroidal) axis. In HSS, more material is located further away from this neutral axis compared to a solid beam of the same material and weight. This greater distance increases the moment of inertia, giving HSS better resistance to bending.
2. Section Modulus:
The section modulus, often symbolized as ‘S’, is another property that is indicative of a material’s strength against bending. It is defined as the moment of inertia divided by the distance from the neutral axis to the outer surface of the shape. Like the moment of inertia, the section modulus for HSS is larger than for a solid beam of the same material and weight, providing superior resistance to bending.
3. Torsional Constant:
The torsional constant, also known as the torsion constant, and represented as ‘J’, is a property that describes an object’s resistance to torsional deformation. For a circular HSS, the torsional constant is higher than for a solid circular bar of the same material and weight, providing superior resistance to torsion.
These mechanical properties are all influenced by the shape and distribution of material in a structural element. A hollow section places more material further from the neutral axis, which increases these properties and therefore improves resistance to bending and torsion. This is why, for the same weight, HSS can often be stronger than solid steel.
The use of pipe piles in foundation construction has been a popular choice for many years. Pipe piles are used to transfer the load of a structure to a deeper, more stable layer of soil or rock.
Benefits of Pipe Trusses The use of pipe trusses in construction offers several notable advantages: Strength and Load-bearing Capacity: Pipe trusses are renowned for their high strength-to-weight ratio. The interconnected pipes distribute loads evenly, resulting in a sturdy and reliable structure. This allows for the construction of large spans without the need for excessive support columns or beams.
The standard for fluid-conveying seamless pipes depends on the country or region you are in, as well as the specific application. However, some widely used international standards for fluid-conveying seamless pipes are: ASTM A106: This is a standard specification for seamless carbon steel pipes for high-temperature service in the United States. It is commonly used in power plants, refineries, and other industrial applications where high temperatures and pressures are present. It covers pipes in grades A, B, and C, with varying mechanical properties depending on the grade. API 5L: This is a standard specification for line pipes used in the oil and gas industry. It covers seamless and welded steel pipes for pipeline transportation systems, including pipes for conveying gas, water, and oil. API 5L pipes are available in various grades, such as X42, X52, X60, and X65, depending on the material properties and application requirements. ASTM A53: This is a standard specification for seamless and welded black and hot-dipped galvanized steel pipes used in various industries, including fluid-conveying applications. It covers pipes in two grades, A and B, with different mechanical properties and intended uses. DIN 2448 / EN 10216: These are European standards for seamless steel pipes used in fluid-conveying applications, including water, gas, and other fluids. Read more
Fluid-conveying seamless pipes are designed to resist various types of corrosion depending on the material used and the specific application. Some of the most common types of corrosion that these pipes are designed to resist include: Uniform corrosion: This is the most common type of corrosion, where the entire surface of the pipe corrodes uniformly. To resist this type of corrosion, pipes are often made of corrosion-resistant materials, such as stainless steel or lined with protective coatings. Galvanic corrosion: This occurs when two dissimilar metals are in contact with each other in the presence of an electrolyte, leading to the corrosion of the more active metal. To prevent galvanic corrosion, pipes can be made of similar metals, or they can be isolated from each other using insulating materials or coatings. Pitting corrosion: Pitting is a localized form of corrosion that occurs when small areas on the pipe's surface become more susceptible to attack, leading to the formation of small pits. This type of corrosion can be prevented by using materials with high pitting resistance, such as stainless steel alloys with added molybdenum, or by applying protective coatings. Crevice corrosion: Crevice corrosion occurs in narrow spaces or gaps between two surfaces, such Read more
Wedge wire screens, also known as profile wire screens, are commonly used in various industries for their superior screening capabilities. They are constructed from triangular-shaped wire,
2 7/8in J55 K55 Perforated Well Casing Pipe is one of mainly products of we abter steel, they can be used for water, oil, gas well drilling fields. The thicknesss can be supplied from 5.51-11.18mm based on client's well depth and required mechanical properties. Normally they are provided with thread connection, like NUE or EUE, which will be easier to installed at site. The length of 3-12m perforated casing pipes are available for client's different drilling rigs height. The hole diameter and open area on the surface are also customized. The popular hole diameters are 9mm, 12mm, 15mm, 16mm, 19mm, etc.