180° Short Radius Return Bend Manufacturer, Supplier & Exporter
A 180° short radius return bend reverses the direction of a pipeline with a centreline radius equal to the nominal pipe size (R = 1D), bringing the two legs just two pipe diameters apart. Raaj Fittings manufactures and exports short radius return bends to ASME B16.28 — now part of ASME B16.9 — in stainless steel, alloy steel, carbon steel, duplex and nickel alloys.
The short radius return is used where coils and multi-pass bundles must be as compact as possible: tight heater coils, small heat exchangers, cooling coils inside vessels and tanks, and congested skids. It replaces two short radius 90° elbows and the weld between them.
Both ends are bevelled for butt welding, and every bend is supplied with EN 10204 3.1 mill test certificates, with 3.2 certification on request.
We export 180° short radius return bends to EPC contractors, refineries and stockists across the Middle East and GCC, Europe and the Americas — to ASME B16.9 for US and Gulf projects, or EN 10253 / DIN dimensions for European specifications, with PED-compliant supply on request.
180° SR Return Bend Specifications
1" NPS to 24" NPS; larger sizes to order
Short radius: centreline radius 1.0 × NPS; centre-to-centre 2 × NPS
SCH 5S to XXS, including STD, XS, SCH 40, 80 and 160
ASME B16.28 (now part of ASME B16.9), MSS SP-43
Seamless (SMLS) and welded (ERW / EFW)
Bevelled ends for butt welding to ASME B16.25
EN 10204 3.1 mill test certificate as standard; EN 10204 3.2 on request
Materials & Grades
We supply 180° short radius return bends in the following materials and grades. All grades are supplied with EN 10204 3.1 / 3.2 Mill Test Certificates.
Stainless Steel 180° Short Radius Return Bends
Stainless steel buttweld fittings deliver excellent corrosion resistance and are essential in chemical, pharmaceutical, food processing, and marine environments. All grades supplied to ASTM A403 specification.
(ASTM A403 WP304 / WP304L) General corrosion resistance; food, dairy, and chemical service
(ASTM A403 WP316 / WP316L) Enhanced chloride and acid resistance; pharmaceutical, marine, and chemical processing
(ASTM A403 WP316H) Elevated-temperature creep strength for high-temperature process service
(ASTM A403 WP317 / WP317L) Higher molybdenum content; superior corrosion resistance in concentrated acid service
(ASTM A403 WP321) Titanium-stabilised; resists sensitisation at sustained elevated temperatures
(ASTM A403 WP347) Columbium-stabilised; ideal for heat exchangers and high-temperature piping
High-alloy austenitic; superior resistance to hot concentrated sulfuric and phosphoric acids
Duplex & Super Duplex Stainless Steel 180° Short Radius Return Bends
Duplex and super duplex grades offer approximately twice the yield strength of standard austenitic stainless steel, combined with excellent resistance to stress corrosion cracking and pitting — ideal for offshore, subsea, and chemical processing environments.
(UNS S31803 / S32205) Offshore topsides, chemical plant, desalination, and seawater piping
(UNS S32750) Seawater systems, subsea equipment, FPSOs, and high-chloride offshore environments
(UNS S32760) High-temperature, high-chloride offshore and subsea service applications
Nickel Alloy 180° Short Radius Return Bends
For the most aggressive corrosive environments — concentrated acids, caustic solutions, sour gas service, and extreme temperatures — we offer buttweld fittings in a full range of nickel alloys.
(UNS N06600) High-temperature oxidation and carburisation resistance
(UNS N06625) Outstanding broad-spectrum corrosion resistance; offshore, chemical, and subsea service
(UNS N08825) Resistance to phosphoric and sulfuric acids; FGD systems and chemical plant
(UNS N10276) Universal corrosion resistance across the widest range of aggressive process media
(UNS N06022) Superior resistance to oxidising and reducing acids and pitting attack
(UNS N04400) Suitable for seawater, hydrofluoric acid, and marine and alkali service
(UNS N08020) Engineered for sulfuric acid and aggressive chemical process service
Exceptional corrosion resistance in seawater and oxidising media at low density
(C70600 / C71500) Preferred for marine seawater piping and naval condenser systems
Carbon Steel 180° Short Radius Return Bends
Carbon steel is the most widely specified material for general-purpose, hydrocarbon, and elevated-temperature service. The primary grade is ASTM A234 WPB for standard service. For high-yield pipeline fittings, we supply ASTM A860 WPHY grades to MSS SP-75.
Standard carbon steel; primary grade for general-purpose process piping buttweld fittings
Impact-tested carbon steel for low-temperature service down to -46°C (-50°F); LNG and cryogenic piping
High-yield pipeline fittings to MSS SP-75; used in high-pressure oil, gas, and liquid transmission pipelines
Alloy Steel 180° Short Radius Return Bends
Chromium-molybdenum alloy steel buttweld fittings are specified for high-temperature, high-pressure service in power generation, petrochemical, and refinery applications. All grades supplied to ASTM A234 specification.
(5% Cr · ½% Mo) Refinery high-temperature service; hydrotreating and catalytic reforming units
(9% Cr · 1% Mo) High-temperature hydrogen-rich process service and steam piping
(1¼% Cr · ½% Mo) Thermal power plant steam, feedwater, and reheat piping
(2¼% Cr · 1% Mo) Reactors and high-temperature pressure piping systems in petrochemical plants
(9% Cr · 1% Mo · V · Nb) Ultra-supercritical steam power plant main steam and hot reheat piping
Compact Coils with Short Radius Returns
With a centre-to-centre distance of only twice the nominal size — 203 mm for a 4" bend — the short radius return packs more passes into the same space than a 180° long radius return bend, whose legs are three diameters apart. That makes it the fitting of choice for compact heat-transfer equipment.
- Space saving — closer pass spacing in heater coils, exchangers and vessel coils.
- One fitting — replaces two 90° short radius elbows and their joining weld.
- Same wall as the tube — matched schedule and bevelled ends for direct welding.
Trade-offs
The tighter bend raises pressure drop and wear on the outer wall compared with a long radius return, and short radius fittings under ASME B16.28 were rated at 80% of the pressure calculated for straight seamless pipe. For erosive or high-velocity service, or where pigs must pass, the long radius return is preferred. Check your piping or equipment code before specifying short radius returns.
Specifying a Return Bend
Give the size, schedule, material grade, short radius (SR) and seamless or welded construction — for example 3" SCH 80 180° SR return, ASTM A403 WP316L-S. Confirm the centre-to-centre and back-to-face dimensions against your coil drawing.
Applications & Industries
- Compact fired heater and furnace coils
- Small heat exchangers and hairpin units
- Heating and cooling coils inside vessels, tanks and reactors
- Skid-mounted process and utility packages
- Chemical, pharmaceutical and food process equipment in stainless steel
Short radius returns are often specified in heat-recovery and process equipment built to tight shop dimensions, where the coil must fit inside a casing, shell or skid frame. Because the bend is a standard ASME fitting, replacement returns can be supplied quickly for maintenance and re-tubing work without new drawings.
Explore the full range of buttweld fittings.
Testing, Inspection, Marking & Packing
Short radius return bends are made under our quality assurance process:
- Incoming material verification with PMI testing
- Chemical and mechanical testing to the applicable ASTM specification
- Heat treatment as required by the material grade
- Radiographic or ultrasonic examination of the weld seam on welded bends
- Dimensional inspection of centre-to-centre, back-to-face, wall thickness and bevel
- Marking with grade, size, schedule, "SR" and heat number
Supplied with EN 10204 3.1 mill test certificates; EN 10204 3.2 certificates and third-party inspection are available on request.
Fittings are packed for export with plastic end caps protecting the bevels, rust-preventive or VCI wrapping on carbon and alloy steel, and seaworthy wooden cases; marking, tagging and packing to your specification are available on request.
Why Choose Raaj Fittings for 180° Short Radius Return Bends?
Raaj Sagar Steels has supplied piping components since 2003 and today manufactures buttweld fittings at two plants in India for buyers in the Middle East, Europe and the Americas.
- Manufactured in-house — 180° short radius return bends are made in our own plants, so material, dimensions and delivery stay under our control.
- Ready stock, short lead times — common sizes and grades are held in stock for prompt dispatch; other sizes, grades and specials are manufactured to order.
- Certified quality — ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certified; PED 2014/68/EU and IBR supply available, and NACE MR0175 / ISO 15156 material on request.
- 100% material verification — PMI testing on incoming material and EN 10204 3.1 mill test certificates with every order; 3.2 certificates on request.
- Third-party inspection ready — we regularly work with SGS, Bureau Veritas, TÜV and DNV.
- Export documentation — MTCs, certificates of origin, packing lists and inspection reports to suit projects in the GCC, Europe and the Americas.
- Export packing — seaworthy packing with end and face protection, and packing to your specification on request.
- Fast response — our team replies to enquiries within one business day.
180° Short Radius Return Bends — FAQs
A short radius return bend is a 180° fitting with a centreline radius equal to the nominal pipe size. It turns a pipe back on itself with the legs two diameters apart.
It is twice the nominal pipe size — for example about 102 mm for a 2" bend and 203 mm for a 4" bend.
Choose it when coil passes must be as close together as possible. Otherwise a long radius return is preferred for its lower pressure drop and wear.
ASME B16.28 covered short radius elbows and returns; it has since been incorporated into ASME B16.9.
Yes. We supply them in chrome-moly alloy steels (ASTM A234 WP5 to WP91), stainless steels, carbon steels, duplex and nickel alloys.
Yes. We supply 180° short radius return bends for projects under the European Pressure Equipment Directive (PED 2014/68/EU), and with IBR certification for Indian boiler applications. NACE MR0175 / ISO 15156 compliant material is also available on request for sour service in the Middle East and the Americas.
