Differences Between EN10253-1 and EN10253-2 Pipe Fittings

General introduction of EN10253-1 and EN10253-2 fittings 

The welded or seamless butt-welding pipe fittings, manufactured to either EN10253-1 or EN10253-2, can be furnished in the same product forms including elbows, return bends, concentric and eccentric reducers, equal and reducing tees, and caps. Both EN10253-1 and EN10253-2 are derived from relative DIN standards which are now obsolete. They supersede DIN 2605-1 & DIN 2602-2 for elbows and return bends, DIN 2616-1 for concentric reducers, DIN 2616-2 for eccentric reducers, DIN 2617 for caps, DIN 2615-1 for tees with reduced pressure factor, DIN 2615-2 for tees in use at full service pressure, and DIN 2609 for technical delivery conditions. All these EN10253 fittings can be made from seamless pipes, weld pipes, plates, forgings, or bars through hot or cold deformation.

Bright bevels of EN10253 fittings

Sand-blasting & Anti-Rust oil painting for EN10253 fittings

Differences between EN10253-1 and EN10253-2 fittings

Despite of the extensive similarities, there are still some significant differences between EN10253-1 and EN10253-2 pipe fittings. The material for EN10253-1 fittings is limited to carbon steel S235 or its alternative S265 which can only be used for general purpose at room temperature without specific inspection requirements(P235TR1, an equivalent steel grade to S235, sometimes are also available with EN10253-1 fittings). No heat treatment is needed for these materials.

EN10253-1 90° Elbow R=3D S235

EN10253-1 90° Elbow 3D 219.1x6.3 P235TR1

Pipe fittings manufactured to EN10253-2 are intended for pressure purpose at room temperature, at low temperature, or at elevated temperatures, and for the transmission and distribution of fluids and gases. EN10253-2 fittings must conform to the essential requirements of the pressure equipment directive(PED 97/23/EC). The material not only covers carbon steel P235TR2, P265TR2, P235GH, P265GH, P355N, P355NH, P355NL, P215NL and P265NL but also incorporates low alloy steel 16Mo3, 10CrMo5-5, 13CrMo1-5, 10CrMo9-10, X11CrMo5, x11CrMo9-1, X10CrMoVNb9-1, 12Ni14, X10Ni9, L290NB, L360NB, L360QB, L415NB, L415QB, and L450QB (For more details, see the chemical requirements and mechanical properties of EN10253-2 pipe fittings). All steel grades under EN10253-2 shall take proper heat treatment which may include one or more of the following methods: normalizing, normalizing and tempering, quenching or tempering, isothermal annealing.

Furthermore, according the the design-requirements of PED 97/23/EC, EN10253-2 fittings shall be furnished in two types: Type A and Type B. Type A fittings have the same wall thickness at the welding ends and at the body of the fitting as a pipe having the same specified wall thickness. Their resistance to internal pressure is less than that of a pipe with the same specified diameter, wall thickness and of the same steel grade. Fittings of Type B have increased wall thickness at the body of the fitting. Hence they can withstand the same pressure as a pipe having the same specified diameter, wall thickness and of the same steel grade.

EN10253-2 90° Elbows 3D 323.9x7.1 Type B 16Mo3

EN10253-2 concentric reducers Type A P265GH