Scope of the Standard
This regulatory document governs the geometric parameters of welded and seamless forged stainless steel pipes. In the industrial terminology of EV Group China, the term “pipe” is strictly distinguished from the category of “tube” and is applied to products intended for main pipelines and complex engineering systems. For sizes NPS 12 (DN 300) and smaller, the nominal diameter does not coincide with the actual outside diameter. For larger diameter pipes, the outside diameter values are unified and correspond to standard sizing series.
An important aspect is the differentiation from ANSI/ASME B36.10M. The “S” marking in the B36.19M standard indicates that the products are specialized for use in corrosive environments. Wall thicknesses for sizes in the 14–22 range (DN 350–550) for classes 10S, 40S, and 80S have unique values that differ from their carbon steel counterparts. EV Group China supplies a complete list of nomenclature, including non-standard wall thicknesses available under ASME B36.10M specifications.
Dimensional Characteristics
All pipe parameters presented in the table are based on the Nominal Pipe Size (NPS). The production of items from NPS 1/8 (DN 6) to NPS 12 (DN 300) is based on a fixed Outside Diameter (O.D.). This concept was developed to ensure the uniformity of the inside diameter for standard wall thicknesses. For pipes NPS 14 (DN 350) and larger, production is oriented toward matching the actual outside diameter to the nominal size.
Compliance with Material Standards
The geometry of the pipes presented in this section fully complies with the requirements of current ASTM specifications for various operating conditions:
- ASTM A213: Seamless ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes.
- ASTM A312: Seamless, welded, and heavily cold worked austenitic stainless steel pipes.
- ASTM A789: Seamless and welded ferritic/austenitic (duplex) stainless steel tubing for general service.
- ASTM A790: Seamless and welded ferritic/austenitic (duplex) stainless steel pipe for critical structures.
- ASTM A928: Ferritic/austenitic (duplex) stainless steel pipe electric-fusion welded with addition of filler metal.
Wall Thickness Calculation and Operational Loads
Selecting wall thickness is a critical design stage. EV Group China engineers recommend performing calculations based on the material’s ability to withstand internal pressure. Design must comply with ASME codes for pressure vessels and boiler installations, as well as ASME B31 rules for high-pressure pipelines. Unless otherwise specified, threaded connections must be performed in accordance with the ANSI/ASME B1.20.1 standard.
Dimensions and Weights of Welded and Seamless Stainless Steel Pipes
| NPS | Outside Diameter, in | Wall Thickness, in | Weight, lb/ft | Schedule No. | DN | Outside Diameter, mm | Wall Thickness, mm | Weight, kg/m |
|---|---|---|---|---|---|---|---|---|
| 1/8 | 0.405 | … (1) | – | 5S | 6 | 10.3 | … (1) | – |
| 1/8 | 0.405 | 0.049 (1) | 0.19 | 10S | 6 | 10.3 | 1.24 (1) | 0.28 |
| 1/8 | 0.405 | 0.068 | 0.24 | 40S | 6 | 10.3 | 1.73 | 0.37 |
| 1/8 | 0.405 | 0.095 | 0.31 | 80S | 6 | 10.3 | 2.41 | 0.47 |
Technical Notes:
(A) Conversion factor: 1 inch = 25.4 mm.
(B) Weight values are given for pipes with plain ends. For ferritic steels, the weight may be 5% lower, and for austenitic steels, 2% higher than the base values for carbon steel.
(1) This wall thickness does not allow for standard threading according to ANSI/ASME B1.20.1.
(2) These sizes are not included in the scope of ASME B36.10M.