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MSS SP-75 Pipe Fitting Elbow WPHY Butt Weld 90 Degree Elbow Long Radius Elbow for Changing Flow Directions
Introduction of MSS SP-75 90 Degree Long Radius Elbows:
MSS SP-75 is a standard practice that governs the manufacturing of high-strength, butt-welding fittings for use in high-pressure gas and oil transmission systems. These fittings are made from carbon and low-alloy steel and are used in various applications such as pipelines, compressor stations, metering and regulating stations.
The standard covers dimensions, tolerances, ratings, testing, materials, chemical and tensile properties, heat treatment, notch toughness properties, manufacture, inspection, certification, and marking for butt-welding fittings with a nominal pipe size (NPS) of 60 and smaller.
MSS SP-75 fittings are classified into seven different classes based on their minimum yield strength: WPHY-42, WPHY-46, WPHY-52, WPHY-56, WPHY-60, WPHY-65, and WPHY-70. The "WP" stands for "wrought pipe" or "wrought plate," while "HY" denotes "high yield."
These fittings, such as long radius elbows, 3R elbows, straight tees, reducing tees, caps, and reducers, are commonly used to connect API 5L pipes or ASTM A694 forged pipe flanges.
In high-pressure oil and gas pipeline fittings, MSS SP-75 Grade WPHY 60, 65, and 70 are frequently utilized. For WPHY-42, 46, 52, and 56, which operate in medium-high pressure pipelines, clients may choose fittings made from ASTM A234 WPB or WPC instead.
Materials and Manufacturing Methods of MSS SP-75 90 Degree Long Radius Elbows:
MSS SP 75 pipe fittings must be manufactured using fully killed steels produced through the open hearth, basic oxygen, or electric furnace process. These materials include blooms, billets, slabs, high-quality forging bars, plates, seamless pipes, or fusion-welded pipes. Welding procedures must comply with Section IX of the ASME Boiler and Pressure Vessel Code, as well as relevant ASTM and API specifications. Post-weld heat treatment should adhere to the guidelines outlined in Section VIII, Division 1 of the ASME Boiler and Pressure Vessel Code. The welding ends (bevels) of the fittings must be provided with varying wall thicknesses.
The manufacturing of MSS SP 75 WPHY pipe fittings can be easily accomplished through forging, hammering, pressing, piercing, rolling, extruding, upsetting, welding, or a combination of these methods. The final products must be devoid of harmful defects or the need for welding repairs. Some customers may request machining and grinding to address surface imperfections.
MSS SP-75 90° Long Radius (L/R) Elbows Dimensions:
| MSS SP-75 90° Long Radius (L/R) Elbows Dimensions | ||
| NPS | Outside Diameter(D) | Center to End(A) |
| 90° Elbows | ||
| 16 | 16 | 24 |
| 18 | 18 | 27 |
| 20 | 20 | 30 |
| 22 | 22 | 33 |
| 24 | 24 | 36 |
| 26 | 26 | 39 |
| 28 | 28 | 42 |
| 30 | 30 | 45 |
| 32 | 32 | 48 |
| 34 | 34 | 51 |
| 36 | 36 | 54 |
| 38 | 38 | 57 |
| 40 | 40 | 60 |
| 42 | 42 | 63 |
| 44 | 44 | 66 |
| 46 | 46 | 69 |
| 48 | 48 | 72 |
| 50 | 50 | 75 |
| 52 | 52 | 78 |
| 54 | 54 | 81 |
| 56 | 56 | 84 |
| 58 | 58 | 87 |
| 60 | 60 | 90 |
Grades of MSS SP-75 WPHY Eccentric Reducer:
MSS SP-75 specifies several grades, known as WPHY grades, for butt-welding fittings. These grades correspond to different minimum yield strengths and are used to categorize the fittings based on their mechanical properties. The WPHY grades specified in MSS SP-75 include:
WPHY-42: This grade has a minimum yield strength of 42,000 psi (290 MPa). It is commonly used in applications that require medium-strength fittings.
WPHY-46: This grade has a minimum yield strength of 46,000 psi (315 MPa). It offers slightly higher strength compared to WPHY-42 and is suitable for applications that require increased toughness.
WPHY-52: This grade has a minimum yield strength of 52,000 psi (360 MPa). It provides higher strength compared to the previous grades and is used in applications that require increased pressure and temperature resistance.
WPHY-56: This grade has a minimum yield strength of 56,000 psi (385 MPa). It offers further increased strength and is suitable for demanding applications that require higher pressure and temperature capabilities.
WPHY-60: This grade has a minimum yield strength of 60,000 psi (415 MPa). It provides even higher strength compared to the previous grades and is commonly used in applications with more demanding requirements.
WPHY-65: This grade has a minimum yield strength of 65,000 psi (450 MPa). It offers increased strength and toughness, making it suitable for high-pressure and high-temperature applications.
WPHY-70: This grade has a minimum yield strength of 70,000 psi (485 MPa). It provides the highest strength among the WPHY grades and is used in applications that require excellent mechanical properties and resistance to extreme conditions.
Advantages of MSS SP-75 90 Degree Long Radius Elbows:
Smooth Flow Characteristics: The longer radius of the MSS SP-75 90 Degree Long Radius Elbow allows for a smoother flow path, reducing turbulence and pressure loss in the fluid or gas flow. This promotes efficient flow and minimizes energy losses, resulting in improved system performance and reduced operating costs.
Increased Flow Efficiency: By reducing pressure loss and turbulence, MSS SP-75 90 Degree Long Radius Elbow helps increase flow efficiency in the piping system. This is particularly beneficial in applications where high flow rates or low-pressure drops are critical, such as in large-scale industrial processes or HVAC systems.
Strength and Durability: MSS SP-75 90 Degree Long Radius Elbow is designed to meet high strength and durability requirements. It is constructed from materials with excellent mechanical properties, allowing it to withstand high-pressure and high-temperature conditions. This makes it suitable for demanding applications in industries such as oil and gas, petrochemical, and power generation.
Minimized Erosion and Corrosion Risk: The longer radius of the MSS SP-75 90 Degree Long Radius Elbow helps minimize the risk of erosion and corrosion. The smoother flow path reduces the impact of fluid flow on the inner surface of the elbow, reducing wear and tear over time. This contributes to the longevity and reliability of the piping system, reducing maintenance and replacement costs.
Applications of MSS SP-75 90 Degree Long Radius Elbows:
Oil and Gas Industry: MSS SP-75 90 degree long radius elbows are extensively used in the oil and gas industry for pipeline systems, refineries, and petrochemical plants. They are employed in fluid transportation, oil and gas processing, and distribution systems. These elbows provide a smooth flow path, ensuring efficient and reliable operation in demanding environments.
Power Generation: In power generation facilities, MSS SP-75 90-degree long radius elbows are used in steam and water distribution systems. They are crucial components in boiler piping, condensate systems, and other high-pressure applications. These elbows handle the flow of steam, water, and other fluids, providing a reliable and durable solution.
Chemical Processing: MSS SP-75 90 degree long radius elbows find applications in chemical processing plants. They are used in pipelines that transport various chemicals, acids, and corrosive substances. The corrosion-resistant properties of carbon steel, combined with the smooth flow path of these elbows, make them suitable for handling aggressive and corrosive media.
HVAC and Plumbing Systems: MSS SP-75 90 degree long radius elbows are employed in heating, ventilation, air conditioning (HVAC), and plumbing systems. These elbows are used in water supply lines, drainage systems, and HVAC ductwork installations. They help change the direction of fluid flow, ensuring efficient and reliable operation in residential, commercial, and industrial buildings.
Water Treatment and Wastewater Management: MSS SP-75 90 degree long radius elbows play a crucial role in water treatment plants and wastewater management systems. They are used in pipelines that handle treated water, sludge, and wastewater. These elbows ensure the proper flow direction and help manage the transportation and treatment of water and wastewater efficiently.
Construction and Infrastructure: MSS SP-75 90 degree long radius elbows are utilized in construction projects and infrastructure development. They are employed in plumbing systems, fire protection systems, and industrial piping networks. These elbows provide a reliable and durable solution for fluid transportation in buildings, bridges, and other structures.
