Hydrostatic testing—commonly referred to as hydrotesting—is a vital procedure used to verify the structural integrity of vessels designed to hold fluids ranging from water to crude oil. However, the very use of water during this process can inadvertently introduce the risk of corrosion, potentially leading to long-term integrity issues. Cortec® has addressed this concern with a straightforward solution: the addition of a corrosion inhibitor to the hydrotesting water.
A Simple and Versatile Solution
The Cortec® VpCI®-649 Series provides an effective and adaptable corrosion protection solution both during and after hydrotesting. This additive works by forming a protective film on metal surfaces in direct contact with the treated water. It also offers vapour-phase protection, creating a molecular barrier on surfaces within voids and areas above the waterline.
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At a minimum dosage, VpCI®-649 protects vessels during hydrotesting. Increased concentrations can extend this protection for periods ranging from six months up to two years, depending on operational requirements. For applications where water reuse is necessary, the product is available with either a molybdate or PTSA tracer to confirm proper inhibitor concentration. An additional high-purity version, VpCI®-649 HP, is certified to meet ANSI/NSF Standard 61 for use in drinking water system components.*
The Importance of Proper Application
While selecting a corrosion inhibitor is critical, its effectiveness depends heavily on proper application. This begins with determining the correct dosage, which varies based on the type of water used and the intended duration of protection. For instance, protection needs may differ between a valve undergoing a short-term hydrotest and a heat exchanger that may remain unused on-site for an extended period.
Once the appropriate dosage is identified, ensuring thorough mixing and sufficient dwell time is equally important to guarantee comprehensive internal protection.
Protecting Systems Beyond the Test
Hydrotesting presents a particularly vulnerable moment in the life cycle of piping systems and fluid-handling vessels. The VpCI®-649 Series enables operators to mitigate corrosion risk, not only during the test itself but also throughout storage, transport, and delayed installation periods. With proper planning and implementation, this solution ensures long-term protection and peace of mind.
For those undertaking a hydrotesting project, incorporating corrosion protection with VpCI®-649 helps ensure that short-term validation does not lead to long-term complications.
For more information visit www.cortecvci.com
