Stainless Steel Versus Brass Compression Fittings
Stainless Steel Versus Brass Compression Fittings
(OP)
Is there a problem with using stainless steel compression fittings on copper pipe? Does brass work better?
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Stainless Steel Versus Brass Compression Fittings
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RE: Stainless Steel Versus Brass Compression Fittings
If you are sealing 100 psig at room temperature, anything will probably work- including plastic ferrules, or metal ferrules on plastic tubing. So if your pressure and temperature are low, you can just jam a copper tube into a stainless compression fitting and swage it. It will work- but who knows what pressure that joint will fail at, or how it will fail.
RE: Stainless Steel Versus Brass Compression Fittings
The tolerances published for tubing partially control the tolerancing of tube fittings. Besides OD tolerances, there are tolerances in tube wall thickness, ovality and hardness. Use metal tubing materials that are softer than the fitting material. If you have different suppliers furnishing materials and fitting with different tolerances, the joints may not be perfect.
"The most important consideration in the selection of suitable tubing for any application is the compatibility of the tubing material with the media to be contained. Table 1 lists common materials and their associated general application. Table 1 also lists the maximum and minimum operating temperature for the various tubing materials.
In addition, Parker instrumentation fittings should be used only with stainless steel tubing, aluminum fittings with aluminum tubing, etc. The practice of mixing materials is strongly discouraged. The only exception is brass fittings with copper tubing.
Dissimilar materials in contact may be susceptible to galvanic corrosion. Further, different materials have different levels of hardness, and can adversely affect the fittings ability to seal on the tubing."
http://www.forberg.com/pdf/techSup/Home_Tech%20Sup...
RE: Stainless Steel Versus Brass Compression Fittings