{"data":{"id":"us/30-cfr-18.98","jurisdiction":"us","citation":"30 CFR 18.98","heading":"Enclosures, joints, and fastenings; pressure testing.","body":"(a) Cast or welded enclosures shall be designed to withstand a minimum internal pressure of 150 pounds per square inch (gage). Castings shall be free from blowholes.\n(b) Pneumatic field testing of explosion-proof enclosures shall be conducted by determining:\n(1) Leak performance with a peak dynamic or static pressure of 150 pounds per square inch (gage); or\n(2) A pressure rise and rate of decay consistent with unyielding components during a pressure-time history as derived from a series of oscillograms.\n(c) Welded joints forming an enclosure shall have continuous gastight welds.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS","PART 18—ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES","Subpart E—Field Approval of Electrically Operated Mining Equipment"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"42e770d23fc4b97a4db4d2df449f9370b66ff2f81cdf17832816a3c65e641b60","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-18.97","next":"us/30-cfr-18.99"},"notice":"GroundRules: Original legal text. Not legal advice."}