This Excel-based calculator helps you size tank blanketing valves according to the API 2000 standard (7th edition). It’s mainly used for sizing valves that control pressure and vacuum relief on atmospheric storage tanks, especially tanks used to store volatile liquids like solvents, fuels, or chemicals.
The purpose is to make sure your tank has the right-sized back pressure or blanketing valve to:
- Prevent pressure buildup during filling
- Prevent vacuum collapse during emptying
- Comply with industry safety standards
API 2000 Sizing Calculator Tool
Use this calculator to find out how much flow is needed for:
Tank Blanketing Regulators (also called Pressure Reducing Valves or PRVs) – used to add gas and maintain pressure inside a storage tank (called padding).
Vapor Recovery or Back Pressure Regulators (also known as BPRVs) – used to release excess gas or vapor from a tank (called depadding).
This tool helps you size the valves properly using the latest API 2000 standard (7th edition), ensuring your system stays safe, efficient, and compliant.
What It Does
- Calculates required flow rates during normal tank filling (inbreathing) and emptying (outbreathing)
- Helps size valves that protect tanks from collapse or rupture
- Follows the guidelines used globally for atmospheric tank safety
What You’ll Need Before You Start
Before using the calculator, keep these basic details ready:
- Tank dimensions or volume
- Operating temperature and pressure
- Liquid transfer rates (filling or emptying)
- Vent or blanketing gas type (e.g., nitrogen)
- Tank construction and design limits
How to Use the Excel Sizing Calculator?
Open the Excel file (you may need to enable macros if prompted).
On the main page, you’ll see clearly labeled input fields.
Enter the required data:
- Tank volume
- Filling/emptying rate (in cubic meters/hr or gallons/min)
- Temperature range
- Blanketing gas info
- Any emergency flow cases (if applicable)
The calculator automatically runs the sizing logic in the background using API 2000 formulas.
It provides:
- Required flow capacity
- Suggested valve size
- Operating set points (pressure and vacuum)
- And any warnings or limits exceeded
What You’ll Get
Once you input the details correctly, the tool calculates:
Maximum inbreathing and outbreathing flow rates
Recommended valve or orifice sizes
API 2000-compliant sizing data that can be used to select the actual Jordan Valve model (e.g., Mark 608)
Conclusion
This calculator makes it easy for engineers, designers, and operators to quickly size blanketing valves and stay compliant with safety codes. It’s designed for real-world use with just basic tank information, you don’t need to be an expert in fluid dynamics.
Source: Jordan Valve
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