Closed Expansion Tank Sizing
Reference data and engineering information about closed expansion tank sizing for standard organizations applications.
Overview
Engineering reference data for Closed Expansion Tank Sizing in standard organizations.
Key Formulas
ISO Standard
Quality management systems.
ASTM Standard
Standard test methods for tension testing.
ANSI Standard
Pipe flanges and flanged fittings.
Variables
| Symbol | Description | Unit |
|---|---|---|
| International Organization for Standardization | — | |
| American Society for Testing and Materials | — | |
| American National Standards Institute | — |
Typical Design Parameters
The following reference conditions are commonly used as a baseline for sizing closed expansion tanks. Deviations from these values require the application of a correction factor.
Imperial Units (Baseline)
- Initial Temperature: 50°F
- Initial Pressure: 10 psig
- Maximum Operating Pressure: 30 psig
- Approximate Safety Factor: 2
Metric Units (Baseline)
- Initial Temperature: 10°C
- Initial Pressure: 70 kPa
- Maximum Operating Pressure: 200 kPa
Applying Correction Factors
When your system's initial temperature or initial and maximum operating pressures differ from the baseline values above, you must adjust the base tank size using a correction factor.
- Determine the base tank size from a standard sizing chart using the reference conditions.
- Find the appropriate correction factor from a specialized diagram (not provided in this text) that accounts for your specific pressures and temperatures.
- Multiply the base tank size by this correction factor to obtain the required volume for your application.
Note: Actual tank sizing requires consulting manufacturer-specific charts or computational tools that account for system fluid volume, temperature range, and pressure settings.