CFR > Title 29 - Labor > SUBTITLE B—Regulations Relating to Labor > CHAPTER XVII—OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR (parts 1900 to 1990) > PART 1919—GEAR CERTIFICATION > SUBPART E—Certification of Vessels: Tests and Proof Loads; Heat Treatment; Competent Persons (§1919.26 to §1919.37) > 1919.34—Proof tests after repairs or alterations.