Ductile Iron Mechanical Joint Fittings
Mechanical joint fittings are normally furnished complete with a gland, plain rubber gasket and tee-head alloy steel bolts with heavy hex nuts for each socket. Ductile iron mechanical joint fittings are available for pressure ratings of 150, 250 and 350 psi.
Description
Established in 1982, Hebei Jianzhi Casting Group Co., Ltd. is a well-known manufacturer of malleable cast iron pipe fittings. Our factory covers an area of 1,000,000 square meters, with multiple automatic pipe fitting production lines, as well as CNC machine tools, threading machines and other equipment, resulting in an annual output of more than 80,000 metric tons. Currently, our company has more than 4,000 employees, including hundreds of operators.
Why Choose Us?
Rich Experience
Our company has a large number of professional employees and production teams, as well as more than 40 years of experience in manufacturing pipe fittings and accessories. Our sales, market share and ranking have always been far ahead in the industry.
Broad Market
We have reached friendly cooperation with more than 130 countries and regions in Asia, Europe, Africa, South America and Oceania. Because the products are of high quality and competitively priced, more than 90% of our customers choose to repurchase our products.
Caring Service
Our customer service team is online 24/7, and you can contact us at any time to obtain any information about the product, including quotations, usage tips, and technical guidance. If customers need it, we also help them formulate marketing strategies and provide planning service support.
Wide Range of Product
6 automatic production lines, 12 DISAMATIC D3, 50 CNC machine tool pipe fittings, 800 threading machines and other advanced equipment enable us to efficiently produce various pipe fittings. Our products include ductile iron grooved pipe fittings, malleable iron threaded pipe fittings, malleable iron lined plastic pipe fittings, various pipeline fittings, and machinery spare parts.
Mechanical joint fittings are normally furnished complete with a gland, plain rubber gasket and tee-head alloy steel bolts with heavy hex nuts for each socket. Ductile iron mechanical joint fittings are available for pressure ratings of 150, 250 and 350 psi. Mechanical joining has been in manufacturing for a long time as a way to join tubing to flanges and fittings without the need to weld. Actually, a mechanical joint is stronger than a welded joint. It can withstand over 20,000 pounds of hydrostatic pressure.
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Features of Ductile Iron Mechanical Joint Fittings
Reliability
Ductile iron mechanical joint pipe fittings have high load-bearing capacity and certain elongation. Moreover, they usually use flexible interfaces, and their axial deviation of 3 to 5 degrees will not cause media leakage, and they have strong resistance to earthquakes and foundation settlement.
Easy to Use
Mechanical joining fittings require limited training to operate and any training required can be learned in minutes. All resources needed to learn and operate these fittings are easily available online. Because mechanical joint fittings are easy to install and construct, they don't take a lot of installation time and cost.
Stronger
When a joint is mechanically joined, it becomes more secure than ever. A mechanical joint will not leak, pull apart, or come loose due to pressure, vibrations or temperature change. Because a mechanical joint will not leak, vibrate loose, or pull off when properly installed, engineers who design hydraulic or pneumatic systems consider it superior to welded or brazed joints.
Compatibility
Virtually all pipe materials except plastic can be fitted with ductile iron mechanical joints. It is important to note that the tube must be annealed or ductile. Annealed and ductile materials include, but are not limited to, steel, stainless steel, aluminum, titanium, copper, cupronickel, and inconel.
Advantages of Ductile Iron Mechanical Joint Fittings
Long Lasting
One of the benefits of using ductile iron mechanical joint fittings is that these fittings provide long-lasting, high-quality performance. Ductile iron resists common metal weaknesses and degradation over time. Most materials, such as cast iron or PVC, suffer from structural problems known as "creep" and "stress regression." Over time, these can cause the material to degrade and lose strength. Continuous changes in temperature, pressure and other performance factors can also exacerbate creep and stress regression.
Improve Ductility
Ductile iron is able to overcome constant changes in temperature, pressure and environment. It can do this because it is more malleable. Ductility refers to the ability of a metal to be stretched, squeezed, and deformed without damage. It is a good indicator of a metal's ductility and formability. This means that ductile iron mechanical joint fittings can be manufactured quickly and each tube is likely to be free of any breaks, dents or similar defects. This also means it can withstand additional stress and pressure without cracking or breaking.
Excellent Strength and Resistance
Although ductile iron mechanical joint fittings have similar chemical properties to cast iron mechanical joint fittings, ductile iron has superior strength and resistance. This results from strict casting requirements, metallurgical processes, and improved quality control during manufacturing. When making ductile iron, improved manufacturing processes change the structure of the graphite in the iron. Due to this new graphite structure, ductile iron is almost twice as strong as cast iron. This is demonstrated by the improved results of ductile iron in tensile, beam, ring bending and burst tests. Additionally, ductile iron is many times more capable of withstanding impact forces and elongation than cast iron.
Easy to Maintain
Ductile iron mechanical joint fittings are also much simpler than other types of joints. This means ductile iron joints are easier to install and repair. Additionally, these couplings are capable of greater deflection than other pipe couplings. Ductile iron pipe joints can deflect up to 5 degrees, while other pipes often cannot deflect at the joint. This means that ductile iron pipe reduces the need for pipe bends, thereby reducing the chance of the metal becoming stressed or cracked.
Common Types of Ductile Iron Mechanical Joint Fittings
Mechanical Lock-Type Joint
For installations where the joints may tend to come apart owing to sag or lateral thrust in the pipeline, a mechanical joint having a self-locking feature is used to resist end pull. This joint is similar to the gland-type mechanical joint except that in the locked joint the spigot end of the pipe is grooved or has a recess to grip the gasket. Although only slight expansion or contraction can be accommodated in this type of joint, it does allow the usual 3¹⁄₂° to 7° angular deflection. The lock-type joint finds application above ground in the process industries and in river crossings on bridges or trestles, as well as in submarine crossings or in unusually loose or known marshy soils. Where the locking feature is on the spigot rather than on the bell, this type of pipe can be used with the regular line of mechanical joint fittings.
Mechanical Push-On-Type Joint
Where a low-cost mechanical joint is desired, the roll-on type can be used. In this joint, a round rubber gasket is placed over the spigot end and is pulled into the bell by mechanical means, thus pulling the ring into place in the bottom of the bell. Outside the rubber gasket, braided jute is wedged behind a projecting ridge in the bell. This serves to confine the gasket under pressure in the joint. A bituminous compound is used to seal the mouth of the bell and to aid in retaining the hemp and the rubber gasket. Either bell-and-spigot or mechanical (gland-type) fittings are used with this line of pipe. Push-on joints are made in accordance with ANSI/ AWWA C111/A21.11.
Mechanical Screw-Gland-Type Joint
This type of mechanical joint for cast-iron pipe makes use of a coarse-threaded screw gland drawn up by means of a spanner wrench to compress a standard rubber or composition packing gasket. The joint allows from 2° to 7° angular deflection, as well as expansion or contraction without danger of leaks. A lead ring, inserted in the bell ahead of the gasket, seals off the contents of the line from the gasket. The ring also provides an electric circuit through the joint for thawing out frozen underground mains and service lines by the electrical method. The screw-gland joint is used in piping which conveys water, gas, oil, and other fluids at considerable pressure. The gaskets and lead rings are interchangeable with those used in equivalent lines of mechanical joints of the bolted-gland type.
Installation Tips of Ductile Iron Mechanical Joint Fittings
Tip 1
Clean the socket and the plain end. Lubrication and additional cleaning should be provided by brushing both the gasket and the plain end with soapy water or an approved pipe lubricant meeting the requirements of ANSI/AWWA C111/A21.11 just prior to slipping the gasket onto the plain end for joint assembly. Place the gland on the plain end with the lip extension toward the plain end, followed by the gasket.
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Tip 2
Give the gasket a good inspection. Since you are assembling a joint that may be in service for 50 to 100 years, don't take a chance on a questionable gasket. Lubrication of the gasket also is very important. Anyone who has assembled a push-on joint knows that it is nearly impossible to do without lubrication. In the push-on joint, the gasket is moved into position and compressed during the insertion of the spigot. The mechanical joint seals by the force of the t-bolts pushing the gland, which moves and compresses the gasket. With the gasket being trapped in a confined volume and the gland pushing from one side, the gasket experiences an increase in internal pressure. This pressure causes the gasket to exert enough force against the surfaces of the pipe and fitting to form a seal.
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Tip 3
Insert the pipe into the socket and press the gasket firmly and evenly into the gasket recess. Keep the joint straight during assembly. In this step notice the word "press." If the joint is properly aligned and the pipe spigot and fitting bell are within tolerance, it should not be necessary to pound the gasket in with a hammer. (Note: It is very difficult to press something with a 20 oz. ball peen hammer and getting a bigger hammer is not the same as pressing harder.) Gaskets are made to be very close to the outside diameter of the pipe. When a gasket is pounded into position, a loop of excess rubber is often formed, especially if the fit is tight. This means that some part of the gasket has been stretched with a related excess of gasket being stuffed into one area. A pinched gasket is usually an indication that one of the components is out of tolerance.
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Tip 4
Push the gland toward the socket and center it around the pipe with the lip against the gasket. Insert bolts and hand tighten nuts. Make deflection after joint assembly but before tightening bolts. Before inserting the t-bolts, double check to see that they are the right length. This may sound somewhat simplistic but when a 4 1/2" bolt is installed in a 6" fitting that requires a 3 1/2" bolt, there is a strong chance that the nut will bottom out on the threads before the gasket is compressed. If this occurs, it doesn't matter how tight you get the nut, the joint is still not going to seal. Since the threaded length of t-bolts varies between manufacturers, what worked last week on a joint may not work today. Double check the length and remember that the length is measured from under the t-head to the end of the threads.
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Tip 5
Tighten the bolts to the normal range of bolt torque while at all times maintaining approximately the same distance between the gland and the face of the flange at all points around the socket. This can be accomplished by partially tightening the bottom bolt first, then the top bolt, next the bolts at either side, finally the remaining bolts. Repeat the process until all bolts are within the appropriate range of torque. The use of a torque indicating wrench will facilitate this procedure.
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Ultimate Guide
Q: Where should mechanical joints be used?
Q: How does mechanical joint work?
Q: Is a mechanical joint restrained?
Q: What are the strongest mechanical joints?
Q: What are the failure modes of mechanical joints?
Q: What are the classification of mechanical joints?
Q: Which type of joint material is used in a mechanical joint?
Q: Are push-on and mechanical joints rated for the same pressure as the pipe or higher?
Q: What is the maximum rated pressure for push-on and mechanical joints?
Q: What is the difference between Cast Iron and Ductile Iron?
Q: What does MJ mean?
Q: How to install ductile iron mechanical joint fittings?
Q: Do I still need to use expansion joints or loops if I use grooved couplings and fittings in my heating system?
Q: What is a mechanical compression joint?
Q: What is an example of a mechanical joint?
Q: What is difference between a mechanical joint and a restrained joint fitting?
Q: How do mechanical joint fittings fail?
Q: What is the difference between C110 and C153 ductile iron mechanical joint fittings?
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