Black Iron Pipe Fittings
Black pipe fittings are a kind of malleable iron pipe fittings or grooved pipe fittings,are made from corrosion-resistant ungalvanized steel with a scaly, black-colored iron oxide coating. Since there is no surface treatment, they are called black pipe fittings. Correspondingly, it is hot-dip galvanized pipe fittings, that is, galvanizing the surface of black pipe fittings to form a zinc layer of a certain thickness.
The two most common kinds of pipe fittings used to transport liquid and gas are black steel pipe fittings and galvanized steel pipe fittings. Despite the fact that galvanized and black steel pipes are both made of steel, galvanized pipe fittings are zinc-coated, while black steel pipe fittings are not. Galvanized pipes are therefore more durable. Due to its tendency to erode more easily, the black malleable iron pipe is more suitable to carry gas than galvanized pipe. Galvanized pipe, however, is intended to carry water rather than gas in transport applications. The black pipe fittings price is less than that of galvanized pipe fittings.
Pipes and fittings with black iron are connected with black pipe fittings (black malleable iron fittings). The black iron pipe system transports natural gas to residential properties.
Due to its seamless construction, black steel pipe is better suited for gas transportation and fire sprinkler systems since it can prevent fire better than galvanized pipe. As a result of its heat resistance, the black iron pipe is often used in fire sprinkler systems as well as water supply lines to prevent water damage. During the manufacturing process, iron oxide forms a dark colour on its surface, giving the pipe the name black steel pipe.
On the other hand, black steel pipe is not suitable for water transportation. The black steel pipes tend to corrode in water and the minerals will dissolve in the water, clogging the line.
The following is a list of the most common fittings you will come across:
Elbows – this part allows you to bend the supply line and redirect it. PlumbersStock offers 45 and 90-degree elbows in a variety of sizes.
Tees – when buying a black iron tee fitting, there are two basic types from which to choose. There are tees that connect pipes of the same diameter, and there are tees that connect smaller lines to larger ones. Make sure you get the right part.
Bushing reducers – this fitting allows you to extend a pipeline, but reduces it in the process.
Couplings - these black iron pipe fittings join two pipes together and can be of the “reducing” variety. A coupling is made of one solid piece of black iron
Unions – very similar to couplings, unions differ in that they are ideal fitting for quick maintenance. You can easily connect or disconnect the line without having to rotate threading into place (which unintentionally tightens the pipe on the other side of the coupling connection). Unions are very reliable forms of connecting pipe.
Plugs - also referred to as “caps”, they literally plug the end of a pipeline.
|Elbows||Elbow is mainly used to connect two equal diameter pipes perpendicular to each other at the right angle bend of the pipe, and the different diameter elbow is connected with two different diameters perpendicular to each other so that the vertical pipes can be effectively and reasonably linked together.|
|Elbow 90°, equal||Elbow 90°, reducing||Elbow 90°, M&F, equal||Elbow 90°, M&F, reducing||Elbow 45°||Bracket Elbow||Side Outlet Elbow|
|Union||A pipe union is used to connect two pipes and the connection is secure and semi-permanent. It consists of two pipes connected together via a third piece, and all three parts are threaded. The pipe unions are similar to threaded couplings, they are usually easier to remove and allow pipes of different metals to be securely connected together. This connection method is common in home and business plumbing systems.|
|Union, flat seat||Union, flat seat, M&F||Union, conical seat||Union, conical seat, M&F|
|Tee||The tee is the pipe fitting that connects the main pipeline and the branch pipeline. It is divided into many types according to different manufacturing materials and uses. It can be divided into "equal tee" and "reducing tee" according to different specifications.||Caps||The pipe cap is a pipe fitting welded on the pipe end or installed on the external thread of the pipe end to cover the pipe. It is used to close the pipeline and has the same function as the pipe plug.||Bends||Bend refers to the pipe fittings that change the direction of the pipeline in the pipeline system. Elbow by angle, there are 45 °, 90 °, 180 ° three most commonly used.|
|Tee, equal||Tee, reducing||Tee, reducing||Cap, hexagon||Cap, round||Bend 90°, M&F||Bend 90°, female|
|Sockets||The socket is commonly used to connect two pipes of the same size. The socket is also known as Coupling, Malleable iron material, the surface can be hot-dip galvanized and cold galvanized. 220 Socket is part threaded, its threads at both ends are disconnected.||Nipple||Nipples used in the installation of steel and cast iron pipelines. They connect cast iron or steel fittings. The area of applications are various liquids, heat carriers, steam, gas, or compressed air.||Bushing||Bushings are used when the pipe needs to be reduced in diameter.|
|Socket, part threaded||Socket, reducing||Socket, M&F||Nipple, reducing||Nipple, equal||Bushing|
|Cross||The black pipe cross fitting is one of the most commonly used fittings. Usually, they need a thicker wall and heavyweight to prevent the damage for 4 directions pipe threading.||Plug||The plain plug is a kind of closed pipe fitting, which is used at the end of the pipe. Plain plug is an external thread structure, while caps are an internal thread structure.||Round Flange||Flange (flange) connection is the connection of two pipes, fittings, or equipment, each fixed on a flange, between the two flanges, plus flange pads, fastened together with bolts, completed. 329 flange is with holes cast iron flange.|
|Cross, equal||Plug, plain||Round Flange, Without Bolt Hole|
For pipelines with relatively small diameters, threaded black malleable iron pipe fittings are generally used for a connection. For pipes with larger or larger diameters, black grooved pipe fittings or butt welded pipe fittings are used for a connection.
1. Choose a professional factory. Among the factors used to determine the professionalism of the factory are its history, size, delivery time, certifications, and so on. A factory visit is also necessary.
2. Apply to the manufacturer for free samples. After receiving the sample, test whether the product is qualified in terms of surface smoothness, weight, thread accuracy, air tightness, etc.
3. The contract is signed. Pay attention to details such as confirmation, payment method, delivery time, etc.
4. Inspection and delivery. Before shipment, a sample inspection should be carried out on bulk orders. Pay special attention to the consistency of product trademarks to prevent multiple different trademarks from appearing on the same product. (If this is the case, the supplier likely purchases the product from several small factories, not the manufacturer)
Q1: Are black pipe fittings cast iron?
A1: The black pipe fittings are classified according to the surface treatment method, and the material can be malleable iron, ductile iron, carbon steel, PVC, PPR, etc. The black pipe fittings of Jianzhi brand are mainly made of malleable iron and ductile iron.
Q2: How to check the air tightness of the black pipe fittings?
A2: For the air tightness of black pipe fittings, Jianzhi Group has more than 200 testing equipment. All products are 100% tested. Test standard: 0.7Mpa air pressure, no bubbles for more than 5 seconds.
Q3: Are black pipe fittings weldable?
A3: For small OD pipe, we will connect fittings by threaded. The material of the black pipe fittings are malleable iron, stainess steel, etc. For big OD pipe, we will connect fittings through weld, the material usually is carbon steel.
Q4: How are black pipe fittings measured?
A4: For the measurement and inspection of black pipe fittings dimensions, there are several measuring tools for threaded pipe fittings. Vernier callipers are used for size measurement, electronic scales are used for weight measurement, and plug gauges and ring gauges are used for thread accuracy measurement. Then compare the corresponding production standards to confirm whether the product is qualified.
Q5: Does black pipe fittings rust?
A5: Compare black pipe fittings (black malleable iron pipe fittings) with galvanized pipe fittings, the black one is rust easier because the surface doesn't have any protection. Usually, the black pipe fittings will be used for the gas pipe system and petroleum pipe system. For the water system, galvanized pipe fittings are better.
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