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180 degree pipe elbows

Butt weld pipe elbows for ASME and DIN industrial pipeline connections

180 Degree Pipe Elbows

 

1. Product Overview

180° pipe elbows (also called return bends) are U-shaped pipe fittings designed to reverse fluid flow direction by 180° in piping circuits, commonly used for heat exchangers, tank circulation and compact pipeline layout.

2. Main Classification

  • Long Radius 180° Elbow (LR, R=1.5D)：Most popular, low flow resistance, standard engineering option
  • Short Radius 180° Elbow (SR, R=1D)：Compact size for narrow installation space

3. Executive Standards

  • ASME B16.9
  • EN 10253
  • GB/T 12459, GB/T 13401
  • MSS SP-75

4. Available Materials

  • Carbon steel: A234 WPB, P245GH, Q235B
  • Stainless steel: A403 WP304, WP316L
  • Alloy steel: A234 WP11, WP22

5. Technical Parameters

  • Size: 1/2″~48″, DN15~DN1200
  • Connection end: Butt Weld (BW), Socket Weld, Threaded
  • Pressure grade: Class150~Class2500 / PN10~PN160

6. Application

Heat exchange system, boiler pipeline, water circulation, petrochemical, HVAC, power station piping.
 
Custom sizes & special material 180° elbows available per your drawings.

Relate Ptoduct

 

1. Product Overview

180° pipe elbows (also called return bends) are U-shaped pipe fittings designed to reverse fluid flow direction by 180° in piping circuits, commonly used for heat exchangers, tank circulation and compact pipeline layout.

2. Main Classification

  • Long Radius 180° Elbow (LR, R=1.5D)：Most popular, low flow resistance, standard engineering option
  • Short Radius 180° Elbow (SR, R=1D)：Compact size for narrow installation space

3. Executive Standards

  • ASME B16.9
  • EN 10253
  • GB/T 12459, GB/T 13401
  • MSS SP-75

4. Available Materials

  • Carbon steel: A234 WPB, P245GH, Q235B
  • Stainless steel: A403 WP304, WP316L
  • Alloy steel: A234 WP11, WP22

5. Technical Parameters

  • Size: 1/2″~48″, DN15~DN1200
  • Connection end: Butt Weld (BW), Socket Weld, Threaded
  • Pressure grade: Class150~Class2500 / PN10~PN160

6. Application

Heat exchange system, boiler pipeline, water circulation, petrochemical, HVAC, power station piping. Custom sizes & special material 180° elbows available per your drawings.

Relate Ptoduct

Specifications

Item Range
Size 1/2″ – 48″ (DN15 – DN1200)
Wall thickness SCH10 – SCH160, STD, XS, XXS
Standard ASME B16.9 (>= 2″), B16.28 (small bore), DIN 2605, JIS B2311, GB/T 12459
Materials A234 WPB carbon, A420 WPL6 low-temp, A403 WP304/304L/316/316L stainless
Certificates EN 10204 3.1 standard; 3.2 third-party inspection on request

Applications of 180 Degree Elbows (Return Bends)

A 180° elbow (return bend) reverses flow direction completely: heater and furnace passes where fluid runs back through the tube bank, heat exchanger circuits, U-tube bundles, and recirculation loops. Using one 180° return instead of two 90° elbows plus a spool removes two welds from the system – fewer leak points, faster installation, smoother flow.

Available Configurations

ASME B16.9 defines two 180° configurations: long radius (center-to-center = 2 x 1.5D) for standard process service, and short radius (center-to-center = 2 x 1D) for tight heater and exchanger layouts. Both available seamless and welded, in A234 WPB, A420 WPL6 and A403 stainless grades, SCH10-SCH160.

Ordering & Custom Options

Tell us: size, schedule, radius (LR/SR) and material. Non-standard center-to-center dimensions and walls are manufactured to drawing. Every return bend ships stamped with size, schedule and heat number, EN 10204 3.1 certificate included. Request a quote.

FAQs

What is the difference between a 180° elbow and a return bend? They are the same fitting – “return bend” is the common trade name for the 180° elbow.

Can 180° elbows be made in duplex stainless? Yes, on request – send the grade (e.g. UNS S31803/S32205) and quantity for a manufacturing review.