Controlled Glass Bead Peening

Author:  Manning Jr., C. R. et all
Source:  US Patent 3,531,964
Doc ID:  1967000
Year of Publication:  1967
Abstract:  
A method and apparatus for inducing compressive stresses in a pressure vessel to prevent stress corrosion. The apparatus consists of mechanism for rotating the pressure vessel while a lance carrying a nozzle supplied with beads traverses the entire inside surface of the pressure vessel uniformly peening the material to introduce the stress.