Style S couplings incorporate the more noble, duplex-alloy construction, which although initially more expensive, offers the superior corrosion resistance and corresponding better longevity for highly corrosive environments compared to the Style B coupling which is constructed from 316 alloy. Consult Piedmont application engineering for guidance on the selection of metal alloy for your application.
Pressure Rating: 1500 psi (103 bar) with schedule 40s pipe (special alloys) with cut groove only – all sizes.
- Duplex or Superduplex stainless steel type CE8MN (UNS # J93345) conform to ASTM A995, Grade 2A requirements. Piedmont also offers this coupling in superduplex type CE3MN (UNS # J93404) conform to ASTM A995, Grade 5A requirements for higher resistance to corrosion. Other alloys are also available.
- EPDM rubber, suitable for hot and cold water services. Two shapes of gaskets are available: C-shaped or Flush-fit. NSF/ANSI 61 approved or equivalent for drinking water system components. Not suitable for petroleum service. *EPDM peroxide cured gaskets available upon request (for special applications such us chloramines, etc…)
- Round / hexagonal head, oval neck, 316 stainless steel bolts dimensional specifications conforming to ASME B18.5 – 2012. For couplings sizes from ¾’’ to 3’’, use heavy hex type 651 silicon bronze nuts, for couplings of 4’’ and up use 316 stainless steel nuts. Washers are heavy pattern 316 stainless steel.
* For the use of Style S couplings on cyclic axial displacement systems, please consult with Piedmont for design and installation guidance.
Note: Working pressure ratings based upon generally accepted pressure piping design standards and testing in accordance with ASME Section VIII Division 1 pressure vessel test method.