Can a Symmetrical reduction according to EN 10253-4A, stainless steel be used at the same working pressure as a straight pipe of equal D and T?

Symmetrical reduction according to EN 10253-4A, stainless steel: Generally, a Type A concentric reducer has pressure strength that can be slightly lower than a straight pipe of the same outer diameter D and wall thickness T. EN 10253 provides a pressure correction factor to account for the reducer geometry; for typical sizes this factor is about 1.0 Ã· 0.9 of the pressure rating of the corresponding pipe. Practically this means the reducerâs allowable working pressure may be up to ~10% lower than the straight pipeâs value. To be certain for a specific size and material (e.g. AISI 321 or AISI 316Ti) you must apply the exact correction factor from EN 10253 and verify with the EN 10204 3.1 material certificate and the operating conditions (temperature, corrosion allowance). Reported working pressures for these reducers range from 61 to 185 bar depending on diameter.

Does a Symmetrical reduction according to EN 10253-4A, stainless steel require a pressure correction factor compared to a straight pipe of equal D and T?

Symmetrical reduction according to EN 10253-4A, stainless steel: Yes - for type A concentric (symmetrical) reducers the pressure strength can be slightly lower than a straight pipe of the same D and T. EN 10253 provides a pressure correction factor to calculate working pressure; typical values for the sizes covered are about 1.0 to 0.9 of the pipe pressure (i.e. up to ~10% reduction). Use the factor from EN 10253 for the exact size and confirm with material certificate EN 10204â3.1 and applicable design codes.

Symmetrical reduction according to EN 10253-4A, stainless steel

Additional information

Material	SS – stainless steel
Standard length [m]	10

Symmetrical reduction (concentric reducer) for butt welding for pressure applications made from seamless pipes, compliant with standard EN 10253-4 (stainless steel). With material certificate EN 10204 3.1. Commonly used in the industry for the construction of installations and pipelines, as components of complete welded ends for metal and rubber hoses (welded with threaded and flanged ends) and other fittings and valve components. Other sizes and materials are also available upon request, including reductions of more than two sizes DN and ASME reductions. For type A fittings (EN 10253-4A), the pressure strength may be slightly lower than for a straight pipe of the same diameter D and thickness T. The working pressure of the reducer can be determined using the pressure correction factor provided in the EN 10253 standards (for the specified sizes approximately 1.0 ÷ 0.9 of the pressure corresponding to the dimensions of the pipe). Other types of fittings for butt welding are available upon special request: 45° and 180° elbows, eccentric reducers, tees, end caps. Material: stainless steel AISI 321, AISI 316Ti. Working pressure: from 61 to 185 bar – depending on the diameter.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
TK-RS-026-021-SS	Reduction symmetrical 26.9x2.0 / 21.3x2.0, AISI 321, EN 10253-4A	-	160	In stock	Enquiry
TK-RS-026-021-SS316TI	Reduction symmetrical 26.9x2.0 / 21.3x2.0, AISI 316Ti, EN 10253-4A	-	167	In stock	Enquiry
TK-RS-033-021-SS	Reduction symmetrical 33.7x2.6 / 21.3x2.3, AISI 321, EN 10253-4A	-	177	In stock	Enquiry
TK-RS-033-021-SS316TI	Reduction symmetrical 33.7x2.6 / 21.3x2.3, AISI 316Ti, EN 10253-4A	-	185	In stock	Enquiry
TK-RS-033-026-SS	Symmetrical reduction 33.7x2.6 / 26.9x2.3, AISI 321, EN 10253-4A	-	177	In stock	Enquiry
TK-RS-033-026-SS316TI	Reduction symmetrical 33.7x2.6 / 26.9x2.3, AISI 316Ti, EN 10253-4A	-	185	In stock	Enquiry
TK-RS-042-026-SS	Symmetrical reduction 42.4x2.6 / 26.9x2.3, AISI 321, EN 10253-4A	-	139	In stock	Enquiry
TK-RS-042-026-SS316TI	Reduction symmetrical 42.4x2.6 / 26.9x2.3, AISI 316Ti, EN 10253-4A	-	146	In stock	Enquiry
TK-RS-042-033-SS	Reduction symmetrical 42.4x2.6 / 33.7x2.6, AISI 321, EN 10253-4A	-	139	In stock	Enquiry
TK-RS-042-033-SS316TI	Reduction symmetrical 42.4x2.6 / 33.7x2.6, AISI 316Ti, EN 10253-4A	-	146	In stock	Enquiry
TK-RS-048-033-SS	Reduction symmetrical 48.3x2.6 / 33.7x2.6, AISI 321, EN 10253-4A	-	121	In stock	Enquiry
TK-RS-048-042-SS	Reduction symmetrical 48.3x2.6 / 42.4x2.6, AISI 321, EN 10253-4A	-	121	In stock	Enquiry
TK-RS-048-042-SS316TI	Reduction symmetrical 48.3x2.6 / 42.4x2.6, AISI 316Ti, EN 10253-4A	-	128	In stock	Enquiry
TK-RS-060-042-SS	Reduction symmetrical 60.3x2.9 / 42.4x2.6, AISI 321, EN 10253-4A	-	111	In stock	Enquiry
TK-RS-060-042-SS316TI	Reduction symmetrical 60.3x2.9 / 42.4x2.6, AISI 316Ti, EN 10253-4A	-	115	In stock	Enquiry
TK-RS-060-048-SS	Reduction symmetrical 60.3x2.9 / 48.3x2.6, AISI 321, EN 10253-4A	-	111	In stock	Enquiry
TK-RS-060-048-SS316TI	Reduction symmetrical 60.3x2.9 / 48.3x2.6, AISI 316Ti, EN 10253-4A	-	115	In stock	Enquiry
TK-RS-076-048-SS	Reduction symmetrical 76.1x2.9 / 48.3x2.6, AISI 321, EN 10253-4A	-	86	In stock	Enquiry
TK-RS-076-060-SS	Symmetrical reduction 76.1x2.9 / 60.3x2.9, AISI 321, EN 10253-4A	-	86	In stock	Enquiry
TK-RS-088-060-SS	Reduction symmetrical 88.9x3.2 / 60.3x2.9, AISI 321, EN 10253-4A	-	83	In stock	Enquiry
TK-RS-088-076-SS	Reduction symmetrical 88.9x3.2 / 76.1x2.9, AISI 321, EN 10253-4A	-	83	In stock	Enquiry
TK-RS-114-076-SS	Symmetrical reduction 114.3x3.6 / 76.1x2.9, AISI 321, EN 10253-4A	-	72	In stock	Enquiry
TK-RS-114-088-SS	Symmetrical reduction 114.3x3.6 / 88.9x3.2, AISI 321, EN 10253-4A	-	72	In stock	Enquiry
TK-RS-139-114-SS	Reduction symmetrical 139.7x4.0 / 114.3x3.6, AISI 321, EN 10253-4A	-	66	In stock	Enquiry
TK-RS-168-114-SS	Reduction symmetrical 168.3x4.5/ 114.3x3.6, AISI 321, EN 10253-4A	-	61	In stock	Enquiry

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Symmetrical reduction (concentric reducer) for butt welding for pressure applications made from seamless pipes, compliant with standard EN 10253-4 (stainless steel). With material certificate EN 10204 3.1. Commonly used in the industry for the construction of installations and pipelines, as components of complete welded ends for metal and rubber hoses (welded with threaded and flanged ends) and other fittings and valve components. Other sizes and materials are also available upon request, including reductions of more than two sizes DN and ASME reductions. For type A fittings (EN 10253-4A), the pressure strength may be slightly lower than for a straight pipe of the same diameter D and thickness T. The working pressure of the reducer can be determined using the pressure correction factor provided in the EN 10253 standards (for the specified sizes approximately 1.0 ÷ 0.9 of the pressure corresponding to the dimensions of the pipe). Other types of fittings for butt welding are available upon special request: 45° and 180° elbows, eccentric reducers, tees, end caps. Material: stainless steel AISI 321, AISI 316Ti. Working pressure: from 61 to 185 bar – depending on the diameter.