Stainless steel elbow is connected two lengths of pipe or tubing applied in piping and plumbing systems, to change the direction, there are different angles, 45 degree, 90 degree, 180 degree. SS elbow have high strength under high pressure environment, and corrosion resistance.
Beside 45, 90, 180 degree, there are 60 and 45 angle elbow are also available, elbow size range NPS from 1/2 inch to 48 inch, Schedule range covers 5S, 10S, 40S, 80S, 160S, XXS, elboe fitting sizes should be conformed to ASME B16.9 and ASME B16.11.
Elbow is forged or machined to butt welding elbow, threaded ( male and female ), or socket welding elbow, male and female elbow, there have seamless pipe fitting type and seam pipe fitting type. Elbow should be annealed, and mill test certificate is reported according to EN10204/3.1.
Stainless steel Elbow fitting standards
|ASME B16.9||Factory Made Wrought Butt welding Fittings|
|ASTM A403||Wrought Austenitic Stainless Steel Piping Fittings|
|ASTM A960||Common Requirements for Wrought Steel Piping Fittings|
|ASTM A815||Wrought Ferritic, Ferritic/Austenitic, and Martensitic Stainless Steel Piping Fittings|
|EN 10253-3||Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements|
|EN 10253-4||Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements|
From 3.0 mm wall thickness bevelled in compliance with DIN 2559-22 or ASME B 16.25.
Stainless steel grades for elbow
There are various steels to adapt different applications, like Ferritic steels and duplex steels.
Elbows are available in two radius types by length, Short radius (SR) and Long radius (LR), there are also additional radius, for example, 2D, 3D, 4D etc.
Long Radius elbow
Long radius elbow radius is 1.5 times the diameter of the pipe, that means R = 1.5D, this elbow is used for pressure loss, and elbow abrasion.
Short Radius elbow
Short radius elbow radius is equal to the pipe diameter, widely are typically installed in limited situation, in tight space.
Long and Short Radius stainless steel elbow dimensions
|90o Elbows||45o Elbows||180o Returns|
|Long Radius||Short Radius||Long Radius||Long Radius|
|(mm)||(inches)||Center to Face |
|Center to Face |
|Center to Face |
|Center to Center |
|Back to face |
|1/2||21.3||0.840||1 1/2||–||5/8||2||1 7/8|
|3/4||26.7||1.050||1 1/8||–||7/16||2 1/4||1 11/16|
|1||33.4||1.315||1 1/2||1||7/8||3||2 3/16|
|1 1/4||42.2||1.660||1 7/8||1 1/4||1||3 3/4||2 3/4|
|1 1/2||48.3||1.900||2 1/4||1 1/2||1 1/8||3||4 1/2||3 1/4|
|2||60.3||2.375||3||2||1 3/8||4||6||4 3/16|
|2 1/2||73.0||2.875||3 3/4||2 1/2||1 3/4||5||7 1/2||5 3/16|
|3||88.9||3.500||4 1/2||3||2||6||9||6 1/4|
|3 1/2||101.6||4.000||5 1/4||3 1/2||2 1/4||7||10 1/2||7 1/4|
|4||114.3||4.500||6||4||2 1/2||8||12||8 1/4|
|5||141.3||5.563||7 1/2||5||3 1/8||10||15||10 5/16|
|6||168.3||6.625||9||6||3 3/4||12||18||12 5/16|
|10||273.1||10.750||15||10||6 1/4||15||30||20 3/8|
|12||323.9||12.750||18||12||7 1/2||18||36||24 3/8|
The complete sizes are available according to B36.9