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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.
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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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