In general, there are three main types of electrical steel conduits, which include hot-dip galvanized conduit, cold galvanized conduit, and black steel conduit. Each of these conduits has its own specific advantages, and one cannot be used in place of another without considering the environmental conditions and the type of conduit installation. Although black steel conduit has anti-rust capability, its degree of resistance differs from hot-dip and cold galvanized types.
In fact, it is the level of environmental moisture that determines which of these conduits you should use. In the continuation of the article, by providing more details about these conduits and making a general comparison among them, in addition to becoming familiar with black steel conduits, you will also have the ability to identify their advantages and some of their limitations. So do not miss this article and stay with us until the end.
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Black steel conduits are classified into types PG11, PG13.5, PG16 through PG48. Each of these differs from one another in terms of technical specifications. For example, grade 11 of these conduits has a thickness of 1 millimeter, but their grade 48, given that they have a larger size, naturally needs to have a greater thickness as well.
The thickness of these conduits can reach up to 1.5 millimeters. Given the high density of the steel metal in the membrane or wall of the conduits, at such a small thickness, they exhibit good resistance to a desirable extent. The length of a black steel conduit branch is also a maximum of 3 meters, and they are prepared in packaging or bundles of several pieces.
The outer diameter of the conduits also ranges from 18 millimeters up to about 60 millimeters. An increase in the diameter of the electrical steel conduit can cause an increase in their weight. Therefore, if you want to install larger-sized conduits at the heights of a structure, you must definitely use stronger fittings between these conduits and the wall or ceiling substrate surfaces.
Black steel conduit is one of the types of electrical steel conduits that, due to the advantages and capabilities it offers, can also have diverse applications. Among the advantages of black steel conduit, the following can be mentioned:
These conduits, due to having a seam, can be used with easy weldability and also have suitable connections.
The resistance and strength of black steel conduit is very high, which can increase the service life and durability of these conduits.
The execution and installation speed of black steel conduit is high, and this makes their implementation simpler and faster.
A high variety of black steel conduits is available in the market. Therefore, each of these conduits can be used depending on the application and desired need.
The production of black steel conduit does not have a complex process and can be carried out at high speed. Hence, various brands are active in the field of producing and supplying black steel conduits.
Simple maintenance conditions are among the advantages of these steel conduits.
Black steel conduits have a suitable weight and will not cause weight increase in the structure.
Black steel conduit, due to its high resistance and excellent performance, can have diverse applications in the electrical industry and refineries with the help of electrical conduit fittings. In general, the applications of these conduits include the following:
Gas piping in buildings, urban and rural residential centers
Usable in gas and petrochemical industries
Transmission of gas and petroleum fluids
Usable in boiler systems, sewage wells, and oil piping
Manufacturing various metal products in the food and pharmaceutical industries
Suitable for use in the transportation and shipbuilding industries
Construction of oil tanks and gas pipes
One of the most important applications of black steel conduit is its use in the country’s gas supply system. These conduits have high strength and a suitable price for implementation in refineries and oil and gas transmission lines. According to research and studies conducted, black steel conduit can have good performance for gas transmission and demonstrate good performance against heat, corrosion, and other environmental conditions. These steel conduits, with suitable mechanical fittings, can be used in various refineries.
Black steel conduit can perform better compared to other conduits made with large metal sheets, because other conduits are produced through a welding process along a seam and have less flexibility than black conduits. Therefore, they are not very suitable for transmitting important materials such as natural gas and can pose serious risks. However, with seamless black steel conduit, gas leakage and its resulting risks can be prevented.
Black steel conduit, or colored steel conduits, are among the conduits for which colored materials and compounds are used for coating and strengthening. Usually, the paint applied to the conduits is of the epoxy coating type. In fact, these paints have acceptable resistance to rust and can preserve the conduits for a limited period of time.
You must not place these conduits, like hot-dip galvanized conduit, in very high-humidity environments directly exposed to environmental weather. In fact, these conduits have their optimal performance when placed in a dry and stress-free environment. The type of paints on these conduits has a relatively high adhesion intensity and can prevent the conduits from discoloration as well as corrosion.
If we want to provide a general comparison among the three types — hot-dip deeply galvanized conduit, cold galvanized conduit, and black steel conduit — we must say at the very beginning that the most resistant and durable type is hot-dip galvanized conduit. You certainly know the main reason: in fact, the presence of the hot-dip galvanized coating, or molten zinc, on these conduits has increased their durability and service life.
All three of these conduits are designed and manufactured from steel material with a specific thickness. However, their final resistance and strength are determined when they can be completely neutral against chemical processes such as rust. Of course, the cold galvanized conduit and black steel conduit types each also have resistance to corrosion caused by environmental weather to an acceptable extent, but their strength is lower compared to hot-dip galvanized conduit types.
It makes no difference at what points you use the hot-dip steel conduit types. However, if you want to obtain cold conduit types or black steel conduit, you must certainly have high precision and care in correctly using them in an appropriate environment with low humidity.
Black steel conduit generally uses two types of fittings. These two include structural fittings and inter-conduit fittings. Fittings related to the structure are, in fact, parts that hold the conduits in various points such as walls or ceilings. Without using these structural fittings, you cannot employ black steel conduit in an exposed or embedded manner.
The other type of these fittings are, in fact, inter-conduit connecting parts that can extend the path of steel conduit branches or change their direction. But for greater familiarity, we will introduce some of the various types of these parts, which are as follows:
Spit clamps
Various types of conduit bodies
Elbow parts
Pull elbows
Plain tees and pull tee types
Couplings
Various types of caps
These are the parts and fittings that are abundantly used in conduit installation projects. Of course, there are also other fittings used according to the type of project. Among the above parts, each has specific responsibilities.
For example, conduit bodies are fittings that, due to having a separate cover, provide the necessary conditions for accessing the internal connections. In such conditions, you can make changes at the electrical cable connection points as well as troubleshoot and inspect them whenever you wish.
At Rafi Industrial Group, you can purchase the most diverse products related to various types of electrical steel conduit in numerous sizes. These conduits, given their very high manufacturing quality, are generally offered to customers at an affordable price. You can contact the experts of this group to receive pricing information as well as to become familiar with the purchasing process.
Black steel electrical conduit is a conduit made of steel, the surface of which is covered with a black coating for resistance to rust and corrosion. These conduits are used to protect electrical wires and cables in various environments.
High resistance: These conduits have high mechanical resistance and can withstand mechanical pressure and impacts.
Service life: Due to the anti-rust coating, these conduits are resistant to corrosion and rust and have a long service life.
Better protection: These conduits provide better protection against physical damage and electromagnetic interference.
These conduits are mainly used in electrical and industrial systems for the protection and routing of electrical wires and cables. Common applications include installation in commercial, residential, and industrial buildings, as well as infrastructure facilities.
Yes, to increase the service life and efficiency of black steel electrical conduits, it is recommended to inspect them regularly and clean and refurbish them if necessary. Also, correct installation and the use of appropriate fittings can help improve performance and reduce the need for maintenance.
The installation of these conduits does not require special tools and equipment, but it must be carried out by specialists and in compliance with safety and installation standards. Typically, appropriate fittings, brackets, and clamps are used to secure and route the conduits.
The price of these conduits varies depending on various factors such as diameter, thickness, length, and coating type. To receive the exact price, it is better to contact various suppliers and review the product details.
Yes, steel conduits are generally recyclable. This feature helps conserve natural resources and reduce industrial waste.
Black steel electrical conduit has a black coating for corrosion resistance, while galvanized conduit is covered with a zinc layer to resist rust. Galvanized conduits are usually used in high-humidity or outdoor environments, while black steel conduits are more commonly used in indoor and industrial environments.
To choose the best type of black steel electrical conduit, you must consider the specific needs of your project. Factors such as the installation environment, the type of wires and cables, the need for mechanical and chemical resistance, and budget can influence your choice.
