Butt Welding Fitting
Aare International has its resource focusing on butt welding return elbow stocking to secure on time delivery. All return elbows are in all applicable materials and dimensions for direct fired heater application. Fittings' standards as below

ANSI/ASME Standards
ANSI/ASME B 16.25 : Butt Welding Ends
ANSI/ASME B 16.9   : Elbows LR, Tees, Concentric Reducers, Eccentric Reducers, Caps
ANSI/ASME B 16.28 : Elbows SR

MSS Standards
SP-43: Wrought Stainless Steel Butt-Welding Fittings
SP-75: Specification for High Test Wrought Butt Welding Fittings

DIN Standards
DIN 2609    : Steel Butt-welding Pipe Fittings, Technical Delivery Conditions
DIN 2605-1 : Steel Butt-welding Pipe Fittings, Elbows & Bends with Reduced                    Pressure Factor
DIN 2605-2 : Steel Butt-welding Pipe Fittings, Elbows & Bends for Use at Full                    Service
DIN 2615-1 : Steel Butt-welding Pipe Fittings, Tees with Reduced Pressure                    Factor
DIN 2615-2 : Steel Butt-welding Pipe Fittings, Tees for Use at Full Service
DIN 2616-1 : Steel Butt-welding Pipe Fittings, Reducers with Reduced Pressure                    Factor
DIN 2616-2 : Steel Butt-welding Pipe Fittings, Reducers for Use at Full Service
DIN 2617    : Steel Butt-welding Pipe Fittings, Caps

EN Standards
EN 10204   : Inspection Documents for Metallic Products
EN 10253-1: Butt Welding Pipe Fittings, Wrought Carbon Steel for General Use                    and Without Specific Inspection Requirements

JIS
B2311: Steel Butt-welding pipe fittings for ordinary use
B2312: Steel Butt-Welding Pipe Fittings for Special use
B2313: Steel Plate Butt-Welding Pipe Fittings