You're looking for information on the ASME STS-1-2021 standard!
2021
ASME STS-1-2021 - Standard for Steam Turbines asme sts-1 2021 pdf
Here's a brief overview:
This standard provides requirements for the design, materials, fabrication, inspection, testing, and documentation of steam turbines. It covers turbines used for driving generators, pumps, compressors, and other driven equipment. You're looking for information on the ASME STS-1-2021