Hydrostatic Pressure Test Pumps are also a common testing procedure to verify pressure vessels do not leak or have manufacturing flaws. Hydrostatic pressure test pumps & units are important for pressure vessels in the interest of device safety, and durability under operating pressure. Hydro-static pressure testing is a technique to identify leaks within low-pressure vessels and devices such as pipes and plumbing as well. These heavy-duty triplex ceramic plunger pumps are designed for testing boilers, vessels, process piping, steam, and gas lines.