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The FM/UL Listed Shouldered Coupling is a precision-engineered piping component designed exclusively for high-pressure systems utilizing shouldered-end steel pipes. As a key solution for demanding industrial environments, this grooved pipe joint delivers secure, leak-free connections that withstand extreme pressure, vibration, and harsh conditions. Crafted from high-grade ductile iron and equipped with premium gaskets, the coupling ensures long-term reliability in applications where failure is not an option—from mining operations to municipal water infrastructure. Its FM/UL listing confirms compliance with global safety standards, making it a trusted choice for critical piping systems.
Equipped with EPDM, NBR, or specialized gaskets, the coupling creates a tight, permanent seal against fluids. The gaskets are engineered to resist temperature fluctuations, chemicals, and wear, eliminating the risk of leaks even in high-pressure environments.
The coupling’s design allows for quick assembly without welding or complex tools. It can be installed and removed by general workers, reducing labor time and facilitating easy system maintenance, upgrades, or repairs.
Compatible with shouldered-end steel pipes and multiple fluid types—including water, oil, and mild chemicals—the coupling adapts to diverse industries. Its flexibility makes it suitable for both new installations and retrofits of existing piping systems.
The coupling’s FM/UL listing validates its performance in safety-critical applications. It also meets international standards such as AWWA C606 and ISO6182, ensuring compatibility with global piping systems and regulatory requirements.
Material: Ductile iron (ASTM A536, GRADE 65-45-12, QT450-10)
Threads: Compliant with international standards including ASME B1.20.1, ISO 7-1, BS21, BSPT, NPT, and GB 7306
Size Standards: ISO6182, AWWA C606
Available Sizes: 1"-24"
Surface Treatment: Options include electrophoretic painting, electroplating, epoxy coating, and hot-dip galvanizing.
To ensure reliability under high-pressure conditions, the couplings undergo stringent pressure testing as follows:
NO. | Size Range | Pressure Requirement | Holding Time | Test Type |
1 | ≤DN50 | ≥0.5MPa | ≥5s | Air pressure |
2 | >DN50~DN350 | ≥0.5MPa | ≥10s | Air pressure |
3 | >DN350 | 1.5× rated working pressure | 5min | Water pressure |
The choice of gasket material depends on the application medium and environmental conditions. Below are the available options with their specifications:
Gasket Type | Recommended Application Medium | Related Standards | Temperature Range (℃/℉) |
E (EPDM) | Water supply, drainage, sewage, ambient air, weak acids/alkalis | GB5135.11, GB/T 21873 | -30~+130℃ / -22~+266℉ |
D (Nitrile) | Petroleum, vegetable oil, mineral oil | GB5135.11, GB/T 23658 | -20~+80℃ / -4~+176℉ |
S (SIUCON) | Drinking water, high-temperature dry air, high-temperature chemicals | GB/T 28604, GB5135.11 | -40~+180℃ / -40~+356℉ |
F (Fluorine) | Acid/alkaline solutions, hot lubricating oil | HG/T 2181 | -20~+180℃ / -4~+356℉ |
V (Neoprene) | Seawater | - | -20~+100℃ / -4~+212℉ |
Mining environments demand rugged components that withstand high pressure and abrasive media. The coupling’s durable construction and leak-proof seal make it ideal for piping systems in mineral extraction, slurry transport, and underground mining.
Tunneling projects require reliable piping connections that fit in confined spaces. The coupling’s compact design, easy installation, and pressure resistance make it suitable for underground water supply, drainage, and ventilation pipelines.
Municipal water treatment plants and distribution networks rely on the coupling to maintain leak-free connections in high-pressure pipelines. Its corrosion resistance and potable water compatibility ensure safe, efficient water delivery to communities.
Manufacturing plants, refineries, and processing facilities use the coupling for high-pressure piping carrying chemicals, oil, or process water. Its durability and compatibility with industrial fluids make it a staple in heavy-duty operations.
Yes. When paired with SIUCON or Fluorine gaskets, the coupling can operate in temperatures up to 180°C (356°F). The ductile iron body and corrosion-resistant coating also withstand thermal stress without deforming.
Gasket replacement depends on usage and fluid type. For standard water applications, gaskets typically last 5–7 years. For harsh environments or aggressive fluids, annual inspections are recommended, with replacement at the first sign of wear.
While designed for shouldered-end steel pipes, the coupling can be used with copper or PVC pipes when paired with appropriate adapters. Always confirm compatibility with the pipe material and fluid type before installation.
