Ensure your high-pressure equipment meets all safety regulations with Fire Extinguisher Specialists. Beyond fire protection, we are the Mid-Ohio Valley’s trusted source for DOT-certified hydrostatic testing for compressed gas cylinders. Our facility is equipped to test cylinders up to 10,000 PSI, checking structural integrity by measuring expansion under pressure. Whether for industrial gas or other high-pressure applications, our certified technicians ensure your cylinders are safe for transport and use.

Questions about testing intervals? Call our experts in Marietta, OH today at (740) 373-0515.

Testing frequency varies based on your cylinder’s specific material and rating – typically occurring on a 3, 5, or 10-year cycle. To determine your deadline, check the stamped markings on the cylinder’s shoulder. These stamps indicate the DOT specification and service pressure. For example, a marking of “DOT 3AA 1800” designates a standard 3AA cylinder rated for 1,800 PSI. If you are unsure how to read your dates or specifications, bring your equipment to Fire Extinguisher Specialists in Marietta, OH. Our DOT-certified professionals will verify your retest status and ensure you stay safe and compliant.

Test Every Five Years
DOT 3A
ICC 3A
DOT 3AA
ICC 3AA
DOT 3AL

Test Every Three Years
DOT 3HT

Test Every 10 Years
DOT 3AA with a star after the last hydrostatic test date

Specialty cylinders like DOT E or DOT SP are manufactured and tested with special permits from the Department of Transportation.