Durable Rigid Couplings For High-strength, Leak-free Pipe Joints
Standard duty rigid couplings provide robust, leak-free connections for industrial piping systems, ensuring high strength and corrosion resistance.
Durable Rigid Couplings For High-strength, Leak-free Pipe Joints
Standard duty rigid couplings provide robust, leak-free connections for industrial piping systems, ensuring high strength and corrosion resistance.
Standard Duty Rigid Coupling is a high-strength pipe fitting designed to create secure, leak-free connections between pipes in industrial piping systems, ensuring reliable fluid, gas, or steam transmission. These rigid pipe couplings are engineered to comply with standards such as ASTM A536, UL 213, and FM 1920, using materials like ductile iron, carbon steel, or stainless steel for superior corrosion resistance. Widely used in water supply networks, HVAC systems, petrochemical pipelines, and fire protection systems, standard duty rigid couplings provide dependable boiler pipeline protection under pressures up to 300 PSI (20.7 bar) and temperatures ranging from -30°C to 120°C.
The manufacturing process involves precision casting or forging of the coupling body, typically consisting of two ductile iron or steel segments, a rubber gasket (EPDM or Nitrile), and high-strength bolts for secure clamping. Available in sizes from 1" to 12" (DN25 to DN300), these couplings accommodate pipe outer diameters from 33.7mm to 323.9mm, with customizable coatings like red epoxy, galvanization, or Dacromet for enhanced corrosion resistance. The rigid design ensures zero flexibility, maintaining pipe alignment and preventing axial movement, making them ideal for applications requiring stable, non-flexible joints, such as fire sprinkler systems or high-pressure water pipelines.
Standard Duty Rigid Couplings undergo rigorous testing, including hydrostatic pressure, tensile strength, and sealing integrity tests, to meet UL, FM, and ISO 9001 standards. The EPDM or Nitrile gasket provides a watertight seal, while the ductile iron body offers high tensile strength (minimum 450 MPa) and durability. In HVAC systems, these piping system couplings ensure reliable connections for chilled water or hot water lines, while in petrochemical applications, they handle aggressive fluids with minimal maintenance. The bolted design allows for quick installation without welding, reducing labor costs and downtime.
Compared to flexible couplings or flanged connections, rigid pipe couplings provide superior stability for applications where pipe movement is undesirable. They offer a cost-effective alternative to welded joints, with comparable strength and easier installation. Stainless steel variants (e.g., AISI 304) resist corrosion in saline or chemical environments, while ductile iron couplings are preferred for cost efficiency in water supply systems. These high-strength pipe joints support grooved, threaded, or plain-end pipes, ensuring compatibility with diverse piping materials like steel, PVC, or HDPE.
Addressing challenges like pipeline leaks, corrosion, and misalignment, Standard Duty Rigid Coupling delivers a robust, efficient solution for industrial piping systems. Its high-strength construction, corrosion-resistant materials, and easy installation make it a preferred choice for engineers seeking durable boiler pipeline protection. Whether in fire protection systems, water distribution networks, or petrochemical pipelines, these pipe couplings ensure long-term performance, safety, and reliability in demanding environments.
| Nominal Size mm/in |
Pipe O.D mm/in |
Working Pressure PSI/MPa |
Bolt Size No. - Size mm |
Dimensions mm/in | UL | FM | ||
|---|---|---|---|---|---|---|---|---|
| Ø | L | H | ||||||
| 25 1 |
33.7 1.327 |
500 3.45 |
2 - M10x45 | 60 2.362 |
102 4.016 |
45 1.772 |
• | • |
| 32 1¼ |
42.4 1.669 |
500 3.45 |
2 - M10x45 | 70 2.756 |
106 4.173 |
44 1.732 |
• | • |
| 40 1½ |
48.3 1.900 |
500 3.45 |
2 - M10x45 | 73 2.874 |
108 4.252 |
44 1.732 |
• | • |
| 50 2 |
60.3 2.375 |
500 3.45 |
2 - M10x55 | 87 3.425 |
123 4.843 |
44 1.732 |
• | • |
| 65 2½ |
73.0 2.875 |
500 3.45 |
2 - M10x55 | 100 3.937 |
138 5.433 |
44 1.732 |
• | • |
| 65 2½ |
76.1 3.000 |
500 3.45 |
2 - M10x55 | 103 4.055 |
142 5.591 |
45 1.772 |
• | • |
| 80 3 |
88.9 3.500 |
500 3.45 |
2 - M12x60 | 117 4.606 |
166 6.535 |
45 1.772 |
• | • |
| 100 4 |
114.3 4.500 |
500 3.45 |
2 - M12x65 | 139 5.472 |
190 7.480 |
49 1.929 |
• | • |
| 125 5 |
139.7 5.500 |
400 2.75 |
2 - M12x75 | 168 6.614 |
218 8.583 |
49 1.929 |
• | • |
| 150 6 |
165.1 6.500 |
400 2.75 |
2 - M12x75 | 193 7.598 |
241 9.488 |
49 1.929 |
• | • |
| 150 6 |
168.3 6.625 |
400 2.75 |
2 - M12x75 | 198.5 7.815 |
249 9.803 |
50 1.969 |
• | • |
| 200 8 |
219.1 8.625 |
300 2.07 |
2 - M16x85 | 253 9.961 |
320 12.598 |
59 2.323 |
• | • |
| 250 10 |
273 10.748 |
300 2.07 |
2 - M22x130 | 335 13.189 |
426 16.772 |
68 2.677 |
• | • |
| 300 12 |
323.9 12.752 |
300 2.07 |
2 - M22x130 | 380 14.96 |
470 18.504 |
65 2.559 |
• | • |
The Standard Duty Rigid Coupling is designed to provide a strong and secure connection for pipes in industrial applications. Known for its durability and precision, it is ideal for projects that require a reliable and rigid connection without flexibility in alignment.
Good corrosion resistance, often used in plumbing applications.
Corrosion ResistantExcellent corrosion resistance, suitable for harsh environments and high-purity applications.
Premium GradeCost-effective solution for general purpose applications with good durability.
Cost EffectiveLightweight with good corrosion resistance, used where weight is a concern.
LightweightGood conductivity and corrosion resistance, often used in water systems.
ConductiveDurable with good corrosion resistance, used in marine and industrial applications.
Marine Grade
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