PRODUCTS
STYLE F / FS
Assets
Style F & FS 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 K coupling which is constructed from 316 alloy. Consult Piedmont application engineering for guidance on the selection of plastic or metal alloy for your application.
Application
450 psi (31 bar) and 600 psi (41.4 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.
+ 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.
Features
Pressure Rating
450 psi (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.
+ Duplex (Style F)
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 (Style FS)
Our couplings can also be produced using a Super Duplex material, which offers 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).
Components
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- Housing
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- Duplex & Super Duplex stainless steel type CE8MN, conform to ASTM A995 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.
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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 ASTM F-593 and 594, Group 2, condition CW.
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- Bolts / nuts
TABLE OF SPECIFICATION
| Style F/FS Specifications | |||||
|---|---|---|---|---|---|
| Nominal size | X | Y | Z | Aprx Weight | Pressure rating when cut grooves and sch 40 pipes are used |
| Inches | inches mm. | inches mm. | inches mm. | lbs. kgs. | PSI BAR |
| .75 | 1.82 46 | 2.90 74 | 1.68 43 | 0.7 0.33 | 600 41 |
| 1.0 | 2.21 55l | 3.40 88 | 1.68 43 | 0.8 0.35 | 600 41 |
| 1.25 | 2.42 62 | 3.60 92 | 1.71 43 | 0.8 0.35 | 600 41 |
| 1.5 | 2.56 68 | 3.90 92 | 1.71 43 | 0.8 0.35 | 600 41 |
| 2.0 | 3.14 80 | 4.13 105 | 1.70 43 | 0.9 0.41 | 600 41 |
| 2.5 | 3.63 94 | 5.00 127 | 1.70 43 | 1.5 0.67 | 600 41 |
| 3.0 | 4.30 110 | 5.50 140 | 1.90 47 | 1.8 0.83 | 600 41 |
| 4.0 | 5.18 132 | 6.81 173 | 1.90 47 | 3.3 1.48 | 600 41 |
| 6.0 | 7.90 201 | 9.75 248 | 1.90 47 | 5.2 2.37 | 450 31 |
| 8.0 | 9.94 253 | 12.13 308 | 2.25 57 | 8.6 3.91 | 450 31 |
| 10.0 | 12.12 308 | 14.26 361 | 2.25 57 | 8.6 3.91 | 450 31 |
| 12.0 | 14.18 360 | 16.26 413 | 2.25 57 | 12.2 5.51 | 450 31 |
| 16.0 | 20.9 530 | 21.85 555 | 2.95 75 | 52.8 233 | 450 31 |
| Working pressure Ratings | ||
|---|---|---|
| Pipe weight | Under 2″ dia. | 2″ dia & larger |
| Schedule 40s | 400 psi (28 bar) | 400 psi (28 bar) |
| Schedule 10s | 400 psi (28 bar) | 150 psi (10 bar) |
| Schedule 5s | 400 psi (28 bar) | 120 psi (8 bar) |
* 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.
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
Technical Drawing – Style F
Technical Drawing – Style F (16”)
Product Sheet – Style F
CAD | STP – Style F 0.75
CAD | STP – Style F 1.0
CAD | STP – Style F 1.25
CAD | STP – Style F 1.5
CAD | STP – Style F 2.0
CAD | STP – Style F 2.5
CAD | STP – Style F 3.0
CAD | STP – Style F 4.0
CAD | STP – Style F 6.0
CAD | STP – Style F 8.0
