Hydrotesting and Mothballing Heat Exchange Tube Bundles

1 August 2023

Ten heat recovery steam generation tube bundles were fabricated by STS in five different modular designs. During hydrotesting, VpCI®-649 was added at 0.25% by weight to provide corrosion protection of system internals.

VpCI®-649 combines contact and volatile corrosion inhibitors along with anti-scalants in a non-toxic formulation that does not contain nitrites, phosphates, chromates, or heavy metals. After draining the hydrotest water, VpCI®-309 SF was fogged into the coil bundles at a rate of 350gm/m3 compressed air. VpCI®-309 SF provides up to 24 months of continuous protection

pCI®-309 SF is a silica-free Vapor phase Corrosion Inhibitor powder for corrosion protection of ferrous metals in recessed areas, interior cavities, and voids. VpCI®-309 SF provides an extremely efficient dry method to protect metals within an enclosed space. The VpCI® vaporizes and adsorbs on all metal surfaces reaching all exposed areas including recessed sections and interior cavities.

The customer had procured and stored 19 spare subsea pipeline connectors for several years without protection. Upon inspecting the connectors, they were found to be rusted and required refurbishment. The customer required a long term preservation solution for the refurbished connectors that would withstand the harsh outdoor storage conditions and keep the spares ready for use at any time

Loose rust and surface contaminants on the swivel flanges and bolts were removed using pressurized air. The parts were then put in a tank filled with VpCI®-422 Rust Remover, where they were left to soak until the rust completely disappeared. The rust removal process was followed by power washing with VpCI®-414 Cleaner/ Degreaser diluted 10% with water. The parts were allowed to completely air dry and then coated with VpCI®-369 Rust Preventive.

The refurbished connectors were then protected with VpCI®-111 Emitters and shrink wrapped with VpCI®-126 HP UV Film. The customer was impressed by the efficiency of Cortec’s rust removal and preservation technology and decided to implement Cortec’s “Clean, Protect, & Preserve” concept and products to other equipment stored in the warehouse.