Process Vessel Testing: What Are You Really Verifying?
Before a process vessel sees its first drop of product, it should pass more than just a visual inspection. Testing is engineering discipline. And yet, I still see confusion between leak tests, service tests, hydrostatic tests, and pneumatic tests. Each serves a different purpose, and choosing the wrong one or skipping it altogether can cost far more than the test itself. A hydrostatic pressure test in progress Why Test at All? Because once that vessel is in service, failure isn’t theoretical. It’s downtime, contamination, environmental risk, and reputational damage. Testing isn’t a formality; it’s your last chance to catch what drawings and weld logs can’t. Whether you’re commissioning a new reactor, validating a retrofit, or preparing for regulatory inspection, pressure testing is your final line of defense. It verifies that the vessel can withstand operating conditions, contain the process media, and perform safely over time. But not all tests are created equal. 1. Hyd...