If you want to know the many differences between using metal and non-metallic expansion joints and their benefits, you are in the right place. Until the early 20th century, people used only cylindrical joints to join pipes and others. But the extreme weather changes cause contraction and expansion of concrete structures and piping systems. Expansion joints reduce these changes to ensure the stability and safety of the structures and systems. It may be for buildings, bridges, railway tracks, roadways, piping systems in the petrochemical, and power generation, among others.
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Expansion joints occupy only half the space of the cylindrical joints and one-third of their weight to provide high efficiency and low deformation under pressure. Also, it reduces sediment build-up, turbulence, and thrust effects on the structures and systems. Over time, they evolved to use rubber, plastic and fibre instead of metals. But rubber and later plastics for making flexible rubber expansion joints have unique benefits. So, choose the right rubber expansion joints or other ducting non-metallic expansion joints per your need and budget. Hence check out the differences between metal and rubber expansion joints for pipes and their many benefits.
Before jumping into the differences, you must know about rubber expansion joints. Also known as elastomer expansion joints, they help piping run movements and ensure efficient systems. These flexible rubber expansion joints replacing metals with rubber joints provides many advantages. A few noteworthy among them include reducing noise, relieving movement stresses, isolating vibration, and compensating for misalignment. Also, fabrication from fabric & synthetic elastomers and reinforced with metal offer high temperature and pressure resistance up to 250 degrees Fahrenheit and 200 psig.
Expansion joints patented in were made only of metals to be still in use for their many benefits. But using rubber expansion joints increased in the next few decades because it has unique advantages over metal expansion joints. Though there are many similarities between their functions and benefits, there are also many differences.
Expansion joints made from natural or synthetic rubber have many benefits in several sectors. It is because of the rubbers flexible nature and its easy attachment to other plastic and fibre to increase their benefits. A few of them include.
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Ideal for structures and systems in many sectors like oil & gas, chemical processing, petrochemicals, sugar, cement, and others. You may now be surer of choosing the best rubber expansion joints for piping and others from the above facts, differences, and benefits of buying it from a reputed manufacturer and supplier to save costs and get the best flexible rubber expansion joints for better performance at affordable costs.
Choice of elastomer is very important when your pipeline is conveying liquids other than water. Various elastomers, fluoroelastomers, and fluoroplastics have differing compatibility to chemicals and abrasive slurries. For instance, expansion joint liners can be formulated to handle raw sewage, acids, alkaline, hot air, pure drinking water, abrasive slurry, and many other chemicals and media. Tube liners of natural or pure gum rubber are ideal for use with abrasive material. Synthetic Nitrile rubber is best for raw sewage, EPDM is a good choice for many hot air applications. For chemical applications, your best choice may be Viton, PTFE, or Hypalon. Unisource does not recommend rubber expansion joints for use with compressed gases, steam, or extreme temperature liquids. For shipboard service for commercial vessels, we offer rubber expansion joints that meet the requirements of the U.S. Coast Guard and the Code of Federal Regulations. Our U.S. Navy mil-spec joints can be built with ANSI flange drilling or Navy drilling.
Also, look carefully at the maximum pressure that your piping system will see, It may be during the system hydro-test. Standard rubber expansion joints are made in working pressures of 150 to 225 PSI in most sizes. High pressure products can be manufactured upon request. Keep in mind that higher pressure expansion joints will be heavier and more stiff than lower pressure joints. Generally, rubber expansion joints are reinforce with polyester fabric plies along with steel hoops for vacuum rating. For higher-pressure ratings, Kevlar reinforcing might be indicated.
Rubber expansion joints are readily available in sizes from 1-1/2 inch to 36 inch. Single and double rubber spheres are made in hydraulic molds and range in size from 1-1/2 inch to 16 inch, with larger sizes to 20 available upon special order. Spool-type or arch-type expansion joints can be made in much larger sizes. Sizes on these products vary from 1-1-/2 to 102 diameter.
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