Products Style DS
APPLICATION
Applications can impose severe-duty factors in addition to the maximum continuous operating pressure rating. These additional design requirements must be considered in selecting the appropriate Piedmont coupling.
Download Datasheet Products Style D
Download Datasheet Products Style D 16-18 Inches technical drawing
ASSETS
Style D 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.
FEATURES
Pressure Rating
1200 psi (82 bar) with schedule 40s pipe (special alloys) with cut groove only – all sizes.
Components
- Housing
- Super Duplex* stainless steel type CE8MN, conform to ASTM A-890 Grade 2A. Piedmont also offers this coupling style in CE3MN (Grade 5A) for even higher corrosion resistance. Other alloys are also available, contact Piedmont for details.
- Gaskets
- EPDM rubber, suitable for hot and cold water service. Two shapes of gaskets available: C-shaped or Flush-fit. NSF/ANSI 61 approved for drinking water system components. Not suitable for petroleum service. *EPDM peroxide cured gaskets available upon request (for special applications such us chloramines, etc…)
- Bolts/Nuts
- Round / hexagonal head, oval neck, 316 stainless steel bolts conform to ASTM F-593, group 2, condition CW. Heavy hex silicon bronze nuts for sizes from ¾” to 3”, 316 stainless steel nuts for 4” and above. o Washers are heavy pattern 316 stainless steel.
Duplex
Duplex stainless steel is highly resistant to chloride corrosion because of its metallurgy and microstructure. Used for high pressure couplings for seawater installation our duplex alloy is made of two metallurgical phases with each their role to play in the efficiency of the couplings.
* Duplex 2205 is also available upon request. We highly recommend duplex for sea water corrosive applications.
- Austenite for nobility
- Ferrite for strength
The two phases are homogenized to form a metallic composite analogue to epoxy/glass composite. Our duplex is highly resistant to corrosion and offers twice the tensile and yield strength compared to stainless steel 316. Our duplex alloy is CE8MN and offers better mechanical properties when compared to conventional 316L stainless steel.
* Super Duplex
Our couplings can also be produced using a Super Duplex material, whichoffers even higher corrosion resistance than duplex, and is very similar to alloys 2507 and Zeron 100 which are commonly used for seawater piping.
Made of Super Duplex stainless steel CE8MN alloy, our couplings are austenitic-ferritic stainless steel and highly resistant to chloride stress corrosion. Super Duplex grade of stainless also offers higher strength and better mechanical properties than duplex stainless steel
As an option, these couplings can be specified with CE3MN Super Duplex material, which offers a slightly higher Pitting Resistance Equivalent Number (PREN).
TABLE OF SPECIFICATION
Style D Specifications | |||||
|---|---|---|---|---|---|
| Nominal size | X | Y | Z | Aprx Weight | Pressure rating* |
| Inches | inches
mm. | inches
mm. | inches
mm. | lbs. kgs. | PSI BAR |
| 0.75 | 1.91 48.5 | 3.04 77.2 | 1.68 42.7 | 0.81 0.37 | 1200 82 |
| 1.0 | 2.29 58.2 | 3.42 86.9 | 1.68 42.7 | 0.97 0.44 | 1200 82 |
| 1.25 | 2.50 63.5 | 3.65 92.7 | 1.71 43.4 | 1.08 0.49 | 1200 82 |
| 1.5 | 2.76 70.1 | 4.06 103.1 | 1.71 43.4 | 1.21 0.55 | 1200 82 |
| 2.0 | 3.24 82.3 | 4.38 111.3 | 1.85 47.0 | 1.92 0.87 | 1200 82 |
| 2.5 | 3.74 95 | 5.30 134.6 | 1.85 47.0 | 2.14 0.97 | 1200 82 |
| 3.0 | 4.48 113.8 | 6.02 153.1 | 1.85 47.0 | 2.64 1.20 | 1200 82 |
| 4.0 | 5.70 144.8 | 7.60 193.0 | 2.02 51.3 | 4.54 2.06 | 1200 82 |
| 5.0 | 7.22 183.4 | 9.50 241.5 | 2.02 51.3 | 9.30 4.23 | 1200 82 |
| 6.0 | 8.18 207.8 | 10.25 260.4 | 2.02 51.3 | 9.74 4.42 | 1200 82 |
| 8.0 | 10.89 276.6 | 13.44 341.5 | 2.34 60.7 | 24.50 11.10 | 1200 82 |
| 10.0 | 13.28 337.3 | 15.88 403.3 | 2.55 64.8 | 33.46 15.18 | 1200 82 |
| 12.0 | 15.28 388.1 | 17.38 441.4 | 2.55 64.8 | 34.82 15.80 | 1200 82 |
* Pressure rating when cut grooves and sch 40 pipes are used.
Note I: 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.
Note II: It is allowed a single hydrostatic proof test at 1.5 x rating pressure before being put in operation at its rated pressure or less.
NOTE: For the use of Style DS couplings on cyclic axial displacement systems, please consult with ATS Water technology for design and installation guidance
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