ASTM A234 WP11-S 180 Degree U Bend For High Temperature and Pressure Application

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Model Number:ASTM A234 WP11-S 180 Degree U Bend
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ASTM A234 WP11-S 180 Degree U Bend For High Temperature and Pressure Application


A 180-degree U-bend is a pipe fitting that curves back on itself in a semi-circular or U-shaped pattern, changing the flow direction by 180 degrees. It is commonly used in piping systems where space constraints or thermal expansion management require a tight directional reversal.


Key Features of a 180° U-Bend:


1. Shape & Geometry

-Forms a complete half-circle (U-shape).

-Bend Radius (R): Specified as a multiple of the pipe diameter (e.g., 1.5D, 2D, 3D, where D = pipe diameter).

Example: A 2D bend on a 6-inch pipe has a 12-inch centerline radius.


2. Types of U-Bends

-Short Radius (1D): Tightest bend, used where space is limited.

-Long Radius (1.5D or more): Smoother flow, less pressure drop.

-Custom Radii: Engineered for specific applications.


3. Manufacturing Methods

-Hot Induction Bending: Heated and bent for thick-walled pipes.

-Cold Bending: Used for smaller pipes with thinner walls.

-Mandrel Bending: Ensures smooth interior without wrinkles.


4. Materials

-Carbon steel (e.g., ASTM A234 WPB)


-Alloy steel (e.g., ASTM A234 WP11, WP22)

-Stainless steel (e.g., ASTM A403 WP316)

-Nickel alloys (e.g., Inconel, Monel)


5. End Connections

-Plain Ends (PE): For welding.

-Beveled Ends (BE): Prepared for butt welding.

-Threaded Ends (TE): For screw connections.


Why Use a 180° U-Bend Instead of Two 90° Bends?

  • Fewer Welds: Reduces leak risks.
  • Lower Pressure Drop: Smoother flow than two 90° elbows.
  • Space Efficiency: Compact design for tight layouts.

ASTM A234 WP11 Chemical Composition (%)

ElementWP11 Class 1WP11 Class 2WP11 Class 3
Carbon (C)0.05–0.150.05–0.200.05–0.20
Manganese (Mn)0.30–0.600.30–0.800.30–0.80
Phosphorus (P)≤ 0.030≤ 0.030≤ 0.030
Sulfur (S)≤ 0.030≤ 0.030≤ 0.030
Silicon (Si)0.50–1.000.50–1.000.50–1.00
Chromium (Cr)1.00–1.501.00–1.501.00–1.50
Molybdenum (Mo)0.44–0.650.44–0.650.44–0.65
Nickel (Ni)≤ 0.50≤ 0.50≤ 0.50
Vanadium (V)--≤ 0.03
Columbium (Cb)--≤ 0.08

ASTM A234 WP11 Mechanical Properties

PropertyWP11 Class 1WP11 Class 2WP11 Class 3
Tensile Strength (MPa)≥ 415≥ 485≥ 485
Yield Strength (MPa)≥ 205≥ 275≥ 275
Elongation (%) (min)202020
Hardness (HB) (max)197197197

Notes:

  • WP11 Class 1: Standard grade with lower strength.
  • WP11 Class 2 & 3: Higher strength due to modified heat treatment (Class 3 includes micro-alloying elements like V and Cb).
  • Suitable for high-temperature service (e.g., power plants, refineries).

Applications of A234 WP11-S 180° U-Bend


1. Power Plants

Used in boiler systems, steam lines, and heat exchangers due to its high-temperature resistance.

Suitable for thermal expansion loops to absorb pipe stress.


2. Oil & Gas Refineries

Employed in crude oil processing, petrochemical pipelines, and high-pressure gas lines where corrosion resistance is critical.


3. Chemical Processing Plants

Resists sulfur compounds, acidic, and alkaline environments (thanks to chromium-molybdenum alloy).


4. High-Temperature Steam Systems

Used in steam distribution networks (up to 593°C / 1100°F for WP11).


5. Heating & Cooling Systems

Functions in heat recovery systems, condensers, and district heating pipelines.

China ASTM A234 WP11-S 180 Degree U Bend For High Temperature and Pressure Application supplier

ASTM A234 WP11-S 180 Degree U Bend For High Temperature and Pressure Application

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