Cortec® VpCI® Corrosion-Inhibiting Powders

ECORR Systems offers Cortec® VpCI® corrosion-inhibiting powders for protecting internal surfaces, recessed areas, cavities, voids, tanks, piping, process equipment, and enclosed machinery during storage, shipment, shutdown, or layup.

As an Authorized Cortec® Distributor, ECORR Systems provides multi-metal, ferrous-metal, water-soluble, biodegradable, and silica-free powder options. We can help identify the appropriate product based on the metals, enclosure volume, application method, system condition, exposure environment, and required protection period.

Dry Corrosion Protection for Internal Surfaces

Internal cavities and complex equipment can be difficult to protect with conventional coatings. Turbines, compressors, boilers, heat exchangers, pipelines, tanks, engines, vessels, and closed-loop systems may contain recessed surfaces that cannot be reached by brush, roller, or direct spray application.

Cortec® VpCI® powders provide a dry and efficient method of introducing corrosion protection into these enclosed spaces. Selected powders may also be dissolved in water for wet preservation, hydrotesting, or compatible water-treatment applications.

How VpCI® Powders Work

VpCI® powders release Vapor phase Corrosion Inhibitor molecules into an enclosed atmosphere. These molecules diffuse throughout the space and adsorb onto accessible metal surfaces, forming a protective molecular layer.

The vapor can reach interior surfaces, voids, crevices, cavities, and recessed areas without requiring the powder itself to coat every surface directly. Selected formulations also provide contact protection where the powder or treated solution reaches the metal.

Common VpCI® Powder Applications

• Pipelines, tubular structures, and piping systems
• Storage tanks, pressure vessels, and process vessels
• Boilers, condensers, and heat exchangers
• Turbines, compressors, engines, and pumps
• Closed-loop heating and cooling systems
• Dry equipment layup and mothballing
• Equipment protection after hydrostatic testing
• Internal cavities, voids, and recessed spaces
• Marine vessels, barges, and offshore structures
• Packaged parts, components, and assemblies
• Bottom plates of above-ground storage tanks
• Standing water and wet preservation with appropriate products

Types of Cortec® Corrosion-Inhibiting Powders

Multi-Metal VpCI® Powders

Multi-metal formulations are designed to protect combinations of ferrous and non-ferrous metals inside enclosed equipment, cavities, tanks, piping, machinery, and packaged assemblies. Compatibility should be confirmed for every metal and alloy present.

Ferrous-Metal Powders

Some Cortec® powders are formulated primarily for iron and steel. These products may be appropriate for piping, boilers, tanks, machinery, structural cavities, and other enclosed ferrous-metal systems.

Water-Soluble Powders

Water-soluble powders may be used in compatible wet or dry corrosion-protection applications. Depending on the formulation, they can be dissolved into hydrotest water, standing water, closed-loop systems, or another approved aqueous carrier.

Biodegradable Powder Formulations

Selected Cortec® powder products are formulated for increased biodegradability. Biodegradability, disposal requirements, metal compatibility, and water-treatment suitability should be confirmed for the individual product and application.

Silica-Free Powders

Silica-free formulations are available for applications where silica content is restricted by system requirements, facility specifications, downstream processing, or cleanliness standards.

Premeasured Powder Pouches

Breathable pouches contain VpCI® powder and release protective molecules into an enclosed space without requiring loose powder application. Pouches simplify placement and help reduce powder handling inside packages, vessels, and equipment.

Featured Cortec® VpCI® Powder Products

» Cortec® VmCI®-307 Powder
A multi-metal corrosion-inhibiting powder for recessed areas, interior cavities, voids, tanks, piping, machinery, dry layup, and equipment protection after hydrostatic testing.

» Cortec® VpCI®-308 Powder
A water-soluble, multi-metal powder designed to provide contact and vapor phase protection in enclosed cavities and difficult-to-reach internal spaces.

» Cortec® VpCI®-309 Powder
A dry corrosion-inhibiting powder for protecting ferrous-metal surfaces inside piping, vessels, turbines, compressors, boilers, heat exchangers, and stored equipment.

» Cortec® VpCI®-309SF Silica-Free Powder
A silica-free formulation for protecting ferrous metals in enclosed recessed areas, cavities, and voids.

» Cortec® VpCI®-309 Pouches
Breathable pouches containing VpCI® powder for convenient dry protection of ferrous metals inside packages, equipment, tubular structures, and enclosed spaces.

» Cortec® VpCI®-609 Powder
A water-soluble powder for compatible wet or dry corrosion protection of ferrous metals and aluminum.

» Cortec® VpCI®-649 Powder
A powdered corrosion inhibitor for compatible open- and closed-loop water systems, heating and cooling equipment, hydrotesting, and water-treatment applications.

Powder Application Methods

The appropriate application method depends on the powder, equipment, enclosure size, accessibility, and whether protection will be applied in a dry or wet system. Approved methods may include:

• Dry fogging into enclosed equipment
• Dusting or distributing powder inside a cavity
• Placing premeasured VpCI® pouches inside the space
• Dissolving powder in water before introduction
• Adding the product to hydrotest or standing water
• Circulating a treated solution through a closed system
• Applying powder through access ports or inspection openings

Only use an application method listed for the selected product. Powder quantity, solution concentration, distribution, and enclosure volume must follow the current technical data sheet.

Dry Layup and Mothballing

During dry layup, equipment is drained and prepared before VpCI® powder is introduced into the internal space. The equipment is then enclosed so the protective vapor concentration can develop and remain around the internal metal surfaces.

Dry powder preservation can be useful for boilers, turbines, compressors, heat exchangers, piping, tanks, engines, and other equipment that will remain inactive during seasonal shutdown, construction delays, shipment, or long-term storage.

Protection After Hydrostatic Testing

Hydrostatic testing can leave water trapped inside low points, crevices, valves, fittings, and complex internal spaces. Residual moisture and dissolved contaminants may cause corrosion before the equipment is commissioned.

Depending on the selected powder, VpCI® protection may be introduced through the hydrotest water or applied after draining. The water chemistry, metals, test duration, drainage process, drying method, and time until commissioning should be evaluated when selecting the treatment.

Wet Versus Dry Powder Application

Dry application introduces powder or a powder pouch directly into an enclosed space. It is commonly used for equipment layup, packaged components, cavities, pipelines, and machinery that will remain drained.

Wet application dissolves a compatible powder in water before it is added or circulated through the system. It may be used for hydrotesting, wet layup, closed loops, standing water, and selected process-water applications.

Not every powder is approved for both methods. Confirm solubility, concentration, metal compatibility, discharge requirements, and commissioning procedures before use.

Calculating the Required Powder Quantity

Powder dosage may be based on enclosed volume, internal surface area, water volume, or another product-specific measurement. Using an incorrect calculation can result in inadequate protection or unnecessary product use.

Before calculating treatment requirements, determine:

• The internal volume of the equipment or enclosure
• The volume and chemistry of any treatment water
• The metals and alloys present
• Whether the system is open, vented, or sealed
• The number of separated compartments
• The application method and protection period

Enclosure and Sealing Requirements

Vapor phase protection requires an enclosure capable of retaining the corrosion-inhibiting atmosphere. Open vents, missing covers, unrestricted airflow, failed gaskets, and frequent access may reduce the protective concentration.

Separate cavities or sealed compartments may require individual treatment. After powder application, access points should be closed according to the system design and preservation plan.

Benefits of Cortec® VpCI® Powders

• Protect internal surfaces without coating each area directly
• Reach cavities, voids, crevices, and recessed surfaces
• Support dry and selected wet preservation methods
• Provide options for ferrous and multi-metal systems
• Support hydrotesting, shutdown, storage, and layup
• Offer loose-powder and premeasured-pouch formats
• Allow removal by approved dry or water-rinse methods when required
• Provide selected water-soluble, biodegradable, and silica-free options

Removal and Return to Service

Removal requirements depend on the powder, equipment, downstream process, and amount applied. Selected powders may be removed using dry air, vacuuming, or a water rinse. In some applications, the remaining molecular layer may not interfere with equipment operation.

Do not assume that every powder can remain in place during commissioning. Turbines, compressors, engines, clean-fluid systems, sensitive instrumentation, and process equipment may have specific cleanliness requirements that must be followed.

Powder Handling and Safety

Avoid generating unnecessary airborne dust during handling and application. Use the ventilation, respiratory protection, eye protection, gloves, and other controls specified by the current safety data sheet and facility procedures.

Store powder in its original sealed packaging in a dry location. Moisture exposure can cause caking, reduce flowability, or affect product performance. Close containers promptly between uses.

Environmental and Disposal Considerations

Product characteristics and disposal requirements vary by formulation. Water-soluble or biodegradable does not automatically mean a powder or treated solution can be discharged without review.

Treatment water may contain rust, scale, metals, oil, salts, process chemicals, and other contaminants collected from the system. Facility permits and applicable wastewater requirements should be evaluated before discharge.

Related Cortec® Product Categories

» Water Treatment Products
Corrosion inhibitors and scale-control products for hydrotesting, cooling systems, boilers, heating loops, and industrial process water.

» Water and Oil Additives
Liquid and powder additives for compatible water, oil, hydraulic, fuel, coolant, and process-fluid systems.

» VpCI® Emitting Devices
Emitter cups, foam devices, tape, and pouches for corrosion protection inside smaller enclosed spaces.

» Layup and Preservation Products
Corrosion control products for equipment shutdown, mothballing, storage, shipment, and long-term preservation.

» High-Performance Coatings
Direct-applied corrosion protection for exterior surfaces, equipment, structures, tanks, piping, and machinery.

Why Choose ECORR Systems?

ECORR Systems is an Authorized Cortec® Distributor helping engineers, maintenance teams, equipment operators, preservation contractors, and industrial facilities select VpCI® powders for dry layup, hydrotesting, storage, shipment, and internal equipment protection.

We can help evaluate the equipment dimensions, internal volume, metal types, water chemistry, application method, environmental exposure, commissioning requirements, and protection period to identify the appropriate Cortec® powder and treatment quantity.

FAQ

What is a VpCI® powder?

A VpCI® powder is a dry corrosion inhibitor that releases protective molecules into an enclosed atmosphere. The molecules migrate to accessible metal surfaces and form a molecular layer that helps interrupt corrosion.

What equipment can be protected with VpCI® powders?

Applications may include pipelines, tanks, boilers, turbines, compressors, engines, heat exchangers, closed-loop systems, vessels, machinery, packaged components, and other equipment with enclosed internal surfaces.

Can VpCI® powders be dissolved in water?

Selected Cortec® powders are water-soluble and approved for compatible wet applications. Other powders are intended primarily for dry protection. Follow the current technical data sheet for the selected product.

What is the difference between VpCI®-307, 308, 309, and 609?

These products differ in metal coverage, solubility, composition, environmental characteristics, and approved applications. The correct selection depends on the metals, system, application method, and commissioning requirements.

How much powder do I need?

Dosage is product- and application-specific. It may be calculated from enclosure volume, system volume, water volume, or internal surface area. ECORR Systems can help determine the information needed for the calculation.

Does the equipment need to be sealed?

The equipment must be enclosed well enough to retain the protective vapor concentration. Continuous ventilation, open access points, and excessive leakage may reduce effectiveness.

Does the powder need to touch every metal surface?

No. VpCI® molecules travel through the enclosed atmosphere to reach accessible metal surfaces, including cavities and recessed areas. The powder must still be properly distributed and the space appropriately enclosed.

Must the powder be removed before startup?

Removal requirements depend on the product and equipment. Some formulations can remain without interfering with operation, while sensitive machinery or processes may require air removal, vacuuming, rinsing, or cleanliness verification.

How long does powder protection last?

Selected Cortec® powders may provide continuous protection for up to 24 months when properly applied in a suitable enclosure. Actual duration depends on the product, dosage, enclosure integrity, environment, and storage conditions.

Can ECORR Systems help select and calculate the powder treatment?

Yes. Provide the equipment type, dimensions, internal volume, metals, water conditions, application method, exposure environment, and required protection period. ECORR Systems can help identify an appropriate product and treatment approach.