Corrosion Control Engineering Tools & Calculators

Tools at a Glance

1 - Relative Humidity (RH) Calculator

Determines the amount of water vapour present in air compared to the maximum amount the air can hold at the same temperature.

Inputs
Air Temperature | Wet Bulb Temperature | Moisture Content
Outputs
Relative Humidity (%) | Corrosion Risk Level
Applications
Rig preservation | Ship layup | Electronics storage | Ammunition depots | Warehouses

Corrosion Risk (based on RH)

Environment	Corrosion Risk
RH < 40%	Very Low
RH 40–60%	Low
RH 60–75%	Moderate
RH > 75%	High
RH > 85%	Severe

Relative Humidity and Corrosion Risk Chart

2 - Dew Point Calculator

Determines the temperature at which water vapour begins to condense into liquid water. Most industrial systems calculate this using the Magnus formula.

Inputs
Air Temperature | Relative Humidity
Outputs
Dew Point Temperature | Condensation Warning
Industrial Use
Before: Painting | Coating | Tank entry | Preservation work

Magnus Dew Point Calculation Formula Diagram

3 - Corrosion Rate Calculator

Calculates uniform corrosion rates based on metal weight loss over time in accordance with ASTM G31 standard guidelines.

Inputs
Weight Loss (W) | Area (A) | Exposure Time (T) | Density (D) | Constant (K)
Outputs
Corrosion Rate (mm/year) | Corrosion Rate (mils/year) | Corrosion Rate (µm/year) | Severity Level

Interpretation

Corrosion Rate	Severity
< 0.025 mm/y	Excellent
0.025–0.125 mm/y	Good
0.125–0.25 mm/y	Moderate
> 0.25 mm/y	Severe

Applications
Pipelines | Tanks | Offshore structures | Cooling systems

Weight Loss Method ASTM G31 Corrosion Rate Formula

4 - VCI Dosage Calculator

Determines the quantity of VCI required to protect an enclosed volume.

Inputs
Length | Width | Height | Dosage Rate (g/m³)
Outputs
Volume (m³) | VCI Quantity (g) | Emitters Required | Pouches Required
Applications
Switchboards | Containers | Crates | Electrical cabinets

Enclosed Volume VCI Inhibitor Dosage Calculation Diagram

5 - Hydrotest Dosage Calculator

Determines the required dosage of Vappro VBCI 849, 844 or 849 during hydrotesting.

Inputs
Tank Diameter | Tank Height | Water Volume
Outputs
Water Volume | Required Vappro Dosage | Number of Bags | Mixing Instructions
Applications
Storage tanks | Pressure vessels | Pipelines | Offshore modules

Hydrotest Additive Dosage Calculation Formula for Tanks and Vessels

6 - Tank Circumference Calculator

Determines tank circumference and surface areas for planning coating, inspection and preservation.

Inputs
Tank Diameter (D) | Tank Height (H)
Outputs
Circumference (m) | Shell Area (m²) | Bottom Area (m²) | Total Surface Area (m²)
Applications
Coating estimation | Vappro Slurry estimation | Inspection planning | Scaffold planning

Tank Shell and Bottom Surface Area Calculation Formulas

7 - ER Probe Quantity Estimator

Estimates the optimum quantity of Electrical Resistance (ER) corrosion monitoring probes.

Inputs
Tank diameter | Corrosion risk | Soil resistivity | Chloride contamination | Historical failures
Outputs
Number of ER Probes | Suggested Locations | Monitoring Plan
Applications
Storage tanks | Pressure vessels | Pipelines | Offshore modules

Electrical Resistance ER Corrosion Monitoring Probe Quantity Table

Input

Asset Type:
Jack-Up Rig | FPSO | Vessel | Generator | Transformer | Tank | Electrical Cabinet
Environment:
Tropical | Marine | Desert | Industrial | Offshore
Storage Duration:
3 months | 6 months | 12 months | 24 months | 60 months
Scientific Logic:
The software evaluates-
Atmospheric corrosion | Galvanic corrosion | MIC risk | Mold growth risk | Elastomer degradation | UV degradation | Chloride contamination

Output

Corrosion Risk Assessment:
Low | Moderate | High | Severe
Product Recommendation:
Example-
Main Engine - Vappro VBCI 868, Vappro VBCI 869 and Vappro VBCI 823
Cooling Water System - Vappro VBCI 841
Ballast Tank - Vappro VBCI 844 and Vappro VBCI 867
Accommodation - Vappro VBCI Moisture-Sorb, and Vappro VBCI AMS Anti-Mold Spray
Preservation Budget:
Product quantities | Labour estimate | Inspection schedule
Preservation Report:
Automatically generates -
Method Statement | Product Application Matrix | Inspection Checklist | Recommissioning Procedure

Advanced vapour corrosion inhibitor solutions for industrial asset preservation and corrosion protection worldwide.

10H, Enterprise Road, Singapore 629834

(65) 6786-2616

info@vapprovbci.com

Corrosion Control Engineering Tools & Calculators

Professional calculators and engineering references for corrosion control, preservation planning, and asset management.

Tools at a Glance

01 - Relative Humidity (RH) Calculator

02 - Dew Point Calculator

03 - Corrosion Rate Calculator

04 - VCI Dosage Calculator

05 - Hydrotest Dosage Calculator

06 - Tank Circumference Calculator

07 - ER Probe Quantity Estimator

08 - Preservation Planning Tool