galanmiha
Nuclear
- Nov 8, 2012
- 3
Dear all,
I am asking for your support in trying to understand which is the right approach in using the material specification SA182 for construction of nuclear valves.
- According to SA 182: "4.4 The material shall be forged as close as practicable to the specified shape and size."
- According to ASME Sect. III, ND-2124 "Material Size Ranges and Tolerances":
(a) Material outside the limits of size or thickness given in any specification in Section II may be used if the material is in compliance with the other requirements
of the specification and no size limitation is given in this Subsection. In those specifications in which chemical composition or mechanical properties are indicated to
vary with size or thickness, any material outside the specification range shall be required to conform to the composition and mechanical properties shown for the nearest
specified range [NCA-3856].
- according to ASME Sect. III, ND-4211 "Cutting":
Materials may be cut to shape and size by mechanical means such as machining, shearing, chipping, or grinding, or by thermal cutting.
My question is:
Am I allowed to use Forged bars (SA182) long of 8000 mm (eg), cut it in 4 pieces and make the plugs? Or do I have to order other forged bars at dimensions "as close as possible to the plug size"?
Thank you!
I am asking for your support in trying to understand which is the right approach in using the material specification SA182 for construction of nuclear valves.
- According to SA 182: "4.4 The material shall be forged as close as practicable to the specified shape and size."
- According to ASME Sect. III, ND-2124 "Material Size Ranges and Tolerances":
(a) Material outside the limits of size or thickness given in any specification in Section II may be used if the material is in compliance with the other requirements
of the specification and no size limitation is given in this Subsection. In those specifications in which chemical composition or mechanical properties are indicated to
vary with size or thickness, any material outside the specification range shall be required to conform to the composition and mechanical properties shown for the nearest
specified range [NCA-3856].
- according to ASME Sect. III, ND-4211 "Cutting":
Materials may be cut to shape and size by mechanical means such as machining, shearing, chipping, or grinding, or by thermal cutting.
My question is:
Am I allowed to use Forged bars (SA182) long of 8000 mm (eg), cut it in 4 pieces and make the plugs? Or do I have to order other forged bars at dimensions "as close as possible to the plug size"?
Thank you!