{"data":{"id":"us/46-cfr-58.20-25","jurisdiction":"us","citation":"46 CFR 58.20-25","heading":"-25 Tests.","body":"(a) All pressure vessels, compressors, piping, and direct expansion cooling coils must be leak tested after installation to their design pressures, hydrostatically or pneumatically.\n(b) No pneumatic tests in refrigeration systems aboard ships must be made at pressures exceeding the design pressure of the part of the system being tested. Pneumatic tests may be made with the refrigerant in the system. If the refrigerant has been removed, oil-pumped dry nitrogen or bone-dry carbon dioxide with a detectable amount of the refrigerant added should be used as a testing medium. (Carbon dioxide should not be used to leak test an ammonia system.) In no case should air, oxygen, any flammable gas or any flammable mixture of gases be used for testing.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER F—MARINE ENGINEERING","PART 58—MAIN AND AUXILIARY MACHINERY AND RELATED SYSTEMS","Subpart 58.20—Refrigeration Machinery"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"46caaf4b638014c9b90bab7ff5ff5a5c294e132abb1cdd624a872dbf120f743d","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-58.20-20","next":"us/46-cfr-58.25-1"},"notice":"GroundRules: Original legal text. Not legal advice."}