Nominal Pipe Sizes (NPS)
1/2"DN 15 (O.D. 21.3 mm)
1"DN 25 (O.D. 33.4 mm)
2"DN 50 (O.D. 60.3 mm)
3"DN 80 (O.D. 88.9 mm)
4"DN 100 (O.D. 114.3 mm)
6"DN 150 (O.D. 168.3 mm)
8"DN 200 (O.D. 219.1 mm)
10" - 24"DN 250 to DN 600
Product page
SKYLAND
ASME B16.9 Buttweld 180° Elbow Return Bends
Skyland Metal & Alloys 180° Buttweld Return Elbows are engineered for high-pressure industrial piping systems, heat exchangers, cooling coils, and process fluid manifolds. Available in Long Radius (LR) and Short Radius (SR) configurations with full penetration beveled weld ends per ASME B16.25, ensuring laminar flow reversal with minimal pressure drop and zero leak paths.
Manufactured to ASME / ANSI B16.9, ASME B16.28, DIN 2605, and EN 10253 standards
Available in Long Radius (LR) and Short Radius (SR) 180-degree return geometries
Nominal Pipe Sizes from 1/2" to 36" (DN 15 to DN 900) in seamless and 100% X-ray welded construction
Full range of schedules: Sch 5S, 10S, 40S, STD, 80S, XS, 100, 120, 140, 160, and XXS
Ready for quotationShare your range, connection and case requirement.
Talk to ATHManufacturing StandardASME / ANSI B16.9, ASME B16.28, DIN 2605, EN 10253, MSS SP-43
Size Range1/2" to 36" (Seamless up to 24", Welded 8" to 36")
Wall Thickness / SchedulesSch 5S, 10S, 20, 40S, STD, 80S, XS, 120, 160, XXS
Material GradesCarbon Steel (A234 WPB, A420 WPL6), Stainless (A403 WP304/316L), Duplex 2205, Inconel 625
End PreparationBeveled Ends to ASME B16.25 with 37.5° angle and root face
CertificationsEN 10204 3.1, NACE MR0175 / MR0103, PED 2014/68/EU, ISO 9001:2015
Technical Data & Selection Guide
ASME B16.9 180° Return Bend Specifications
Select nominal pipe size, schedule, material grade, and radius pattern (Long Radius vs Short Radius) for custom quoting and rapid delivery.
StandardASME B16.9 / B16.28
Size Range1/2" to 36"
SchedulesSch 10 to XXS
MaterialsCS, SS, Alloy, Duplex
Wall Thickness / Schedules
SCH10SSchedule 10S Light Wall
SCH40 / STDSchedule 40 / Standard Wall
SCH80 / XSSchedule 80 / Extra Strong
SCH160Schedule 160 High Pressure
SCH-XXSSchedule XXS Double Extra Strong
Material Grades
WPBASTM A234 WPB Carbon Steel
WPL6ASTM A420 WPL6 Low Temp Carbon Steel
WP304LASTM A403 WP304L Stainless Steel
WP316LASTM A403 WP316L Stainless Steel
S31803UNS S31803 / S32205 Duplex Stainless
WP22ASTM A234 WP22 Chrome-Moly Alloy Steel
Part Number Example
SKL-180E-040-SCH40-316L-LR
SKLManufacturerSkyland Metal & Alloys
180EType180° Buttweld Return Elbow
040Size4" NPS (DN 100)
SCH40ScheduleSchedule 40 Standard
316LMaterial316L Stainless Steel
LRPatternLong Radius 1.5D
Technical specifications
Applicable CodesASME B16.9, ASME B16.28, DIN 2605, EN 10253, MSS SP-43
Pressure RatingMatches bursting rating of seamless connected pipe per ASME B31.3
Bevel Angle37.5° ± 2.5° with 1.6 mm root face
Quality AssuranceISO 9001:2015, PED 2014/68/EU, 100% PMI and NDT testing
OriginMumbai & Gujarat, India (Worldwide Export)
Application & Engineering Guidelines
180° return bends allow compact parallel pipe arrangements in heat transfer coils and economizers.
Center-to-center dimension for Long Radius is 3 x Nominal Pipe Size (1.5D radius x 2).
Short Radius 180° bends have center-to-center dimension equal to 2 x Nominal Pipe Size (1.0D radius x 2).
Full material traceability with Heat Number hard-stamped on every fitting body.
Product Overview & Engineering
Skyland Metal & Alloys 180° Buttweld Elbows (Return Bends) provide a seamless 180-degree redirection of fluid flow in piping networks, heaters, boilers, and refrigeration systems. Produced using hot forming, mandrel extrusion, and precision machining processes, each fitting guarantees uniform wall thickness throughout the intrados and extrados arcs.
Every fitting undergoes strict non-destructive examination (NDE), including radiographic inspection (RT), ultrasonic testing (UT), and dye-penetrant testing (PT) to ensure total structural integrity in severe high-temperature and sour service applications.
Eliminates mechanical flange connections and potential leak paths in fluid return headers
Low flow resistance profile reduces turbulence, cavitation, and erosion in high-velocity lines
Comprehensive alloy availability from standard carbon steel to exotic titanium and nickel alloys
100% PMI (Positive Material Identification) verified prior to dispatch
Ordering & Specification Matrix
Radius OptionsLR (Long Radius = 1.5 x NPS center-to-center) and SR (Short Radius = 1.0 x NPS center-to-center)
Carbon Steel GradesASTM A234 WPB, WPC, WPBW; A420 WPL6; MSS SP-75 WPHY 42/52/60/65/70
Stainless Steel GradesASTM A403 WP304/304L, WP316/316L, WP317L, WP321, WP347, 904L, Duplex UNS S31803 / S32205
Alloy Steel GradesASTM A234 WP1, WP5, WP9, WP11, WP22, WP91
Value-Added ServicesHot Dipped Galvanizing, FBE / Epoxy Coating, Pickling & Passivation, Electro-Polishing
Part Number Breakdown
Example Part CodeSKL-180E-040-SCH40-316L-LR
Brand PrefixSKL = Skyland Metal & Alloys Inc.
Fitting Type180E = 180° Buttweld Return Elbow
Size (NPS)040 = 4" Nominal Pipe Size (DN 100)
ScheduleSCH40 = Schedule 40 (Standard Wall)
Material316L = ASTM A403 WP316L Stainless Steel
Radius PatternLR = Long Radius (Center-to-Center = 12.0 inches)
Technical Specifications & Tolerances
Dimensional TolerancesASME B16.9 (Center-to-Center: ±0.25" for sizes 1/2"-8", Back-to-Face: ±0.25")
Wall Thickness MinimumNot less than 87.5% of nominal pipe wall thickness per ASME B16.9
Bevel GeometryPlain beveled for wall <= 22mm (37.5° ± 2.5°), Compound bevel for wall > 22mm
Testing & Inspection100% Radiography on welded seams, Hydrostatic test, Hardness testing per NACE
Installation & Service Notes
Ensure alignment and root gap spacing conform to ASME B31.3 / B31.1 welding procedures before performing root pass welding.
Pre-heat and post-weld heat treatment (PWHT) recommendations apply when welding alloy steels (WP11/WP22/WP91) and low-temp carbon steels (WPL6).