PRODUCTS
STYLE K
Assets
Style K coupling offers favorable corrosion resistance and represents an economical choice since it is constructed from 316 alloy. Better suited for brackish and fresh water, the Style K coupling will perform well under pressures between 300 & 450 psi. Consult Piedmont application engineering for guidance on the selection of plastic or metal alloy for your application.
Advice +
An example of a severe-cyclical duty consideration is piping in the immediate proximity of the discharge of reciprocating, positive displacement piston pumps including the energy recovery devices of this type used in the seawater desalination industry.
Piping components, including grooved end pipe couplings, can be subjected to severe cyclical duty in industrial and desalination plants and engineers and designers need to assure that piping system pulsations and axial displacements are adequately provided for in the piping system design, particularly geometry.
Piping system displacements impart compressive and tensile loads in addition to the axial and hoop stresses arising from both continuous operating pressure and localized pulsation conditions. Displacement loads from reciprocating pumping devices impose additional stresses and require greater strength of the piping-joint components compared to piping components throughout the remainder of a plant at similar pressure, but not subjected to these additional loads. Contact Piedmont for assistance during the early stages of such designs.
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.
Features
Pressure Rating
300 psi (20 bar) to 450 (31 bar) working pressure with schedule 40s pipe with cut groove only.
Pressure ratings for other pipe schedules and groove types, please refer to the table below or consult with Piedmont.
Components
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- Housing
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- 316 stainless steel, Grade CF8M (UNS # J92900) conform to ASTM A351/A351M requirements.
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- Housing
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- Gaskets
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- 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…)
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- Gaskets
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- Bolts/Nuts
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- Round / hexagonal head, oval neck, 316 stainless steel bolts and heavy hex nuts conform to ASME B18.5 and B18.2, respectively.
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- Bolts/Nuts
*Stainless steel 316 is used for its resistance to corrosion. Highly durable, stainless steel requires low maintenance and is ideal for fresh water applications.
Coatings (optional)
To improve against corrosion, couplings coatings components are available upon request:
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- Coated castings with epoxy primer plus polyurethane coating (other coatings available upon request).
- Coated hardware with fluoropolymer coats such as Xylan, Fluorokote or similar (Oil & Gas applications)
TABLE OF SPECIFICATION
| Style K Specifications | |||||
|---|---|---|---|---|---|
| Nominal size | X | Y | Z | Aprx Weight | Pressure rating * |
| Inches | inches
mm. | inches
mm. | inches
mm. | lbs. kgs. | PSI BAR |
| 0.75 | 1.82 46.2 | 2.90 73.7 | 1.68 42.7 | 0.63 0.28 | 450 31 |
| 1.0 | 2.18 55.4 | 3.50 89.0 | 1.70 43.2 | 0.72 0.33 | 450 31 |
| 1.25 | 2.42 61.5 | 3.60 91.4 | 1.70 43.2 | 0.77 0.35 | 450 31 |
| 1.5 | 2.66 67.6 | 3.79 96.3 | 1.70 43.2 | 0.79 0.36 | 450 31 |
| 2.0 | 3.14 79.8 | 4.13 104.9 | 1.70 43.2 | 0.85 0.39 | 450 31 |
| 2.5 | 3.69 93.7 | 5.00 127.0 | 1.70 43.2 | 1.40 0.64 | 300 20 |
| 3.0 | 4.36 110.7 | 5.70 144.8 | 1.85 47.0 | 1.83 0.83 | 300 20 |
| 4.0 | 5.70 144.8 | 7.50 190.5 | 2.02 51.3 | 3.25 1.47 | 300 20 |
| 6.0 | 7.80 198.1 | 9.75 247.7 | 1.90 48.3 | 5.11 2.32 | 300 20 |
| 8.0 | 9.94 252.5 | 12.13 308.1 | 2.25 57.2 | 8.71 3.95 | 300 20 |
| 10.0 | 12.12 307.8 | 14.26 362.2 | 2.25 57.2 | 11.07 5.02 | 300 20 |
| 12.0 | 14.18 360.2 | 16.26 413.0 | 2.25 57.2 | 12.64 5.73 | 300 20 |
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.
Images
Quote request
Piedmont couplings are sold as a whole including the housing, the gasket, the bolts, nuts and washers when necessary. Please specify the coupling size and gasket type required.
Documents
Installation manual
Product Sheet – Style K
Technical Drawing – Style K
CAD | STP – Style K 0.75
CAD | STP – Style K 1
CAD | STP – Style K 1.25
CAD | STP – Style K 1.5
CAD | STP – Style K 2.0
CAD | STP – Style K 2.5
CAD | STP – Style K 3.0
CAD | STP – Style K 4.0
CAD | STP – Style K 6.0
CAD | STP – Style K 8.0
CAD | STP – Style K 10.0
CAD | STP – Style K 12.0
