1. What is the Tank Size Calculator?

The Tank Size Calculator helps determine the appropriate tank size for a 3/4 HP pump operating at 6 GPM, based on desired run time and system fill rate. Proper tank sizing ensures efficient pump operation and prevents short cycling.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( Flow\ Rate \) — Pump flow rate in gallons per minute (GPM)
• \( Run\ Time \) — Desired pump run time in minutes
• \( Fill\ Rate \) — Fraction of tank volume used between pump cycles (typically 0.2-0.3)

Explanation: The formula calculates the tank size needed to achieve the desired run time based on the pump's flow rate and how much of the tank's volume is actually used between pump cycles.

3. Importance of Proper Tank Sizing

Details: Correct tank sizing prevents pump short cycling (frequent starts/stops), reduces energy consumption, and extends pump life. For a 3/4 HP pump at 6 GPM, typical tank sizes range from 20-80 gallons depending on application.

4. Using the Calculator

Tips:

• Default flow rate is set to 6 GPM for 3/4 HP pumps
• Typical fill rate is 0.3 (30% of tank volume used between cycles)
• For longer run times, increase either tank size or fill rate
• All values must be positive numbers

5. Frequently Asked Questions (FAQ)

Q1: Why is fill rate important?
A: Fill rate accounts for the fact that not all tank water is usable - some remains to maintain system pressure. A typical fill rate of 0.3 means only 30% of tank volume is used between pump cycles.

Q2: What's the minimum run time I should aim for?
A: For 3/4 HP pumps, aim for at least 1 minute run time to prevent short cycling. 2-5 minutes is ideal for most applications.

Q3: How does tank size affect pump life?
A: Larger tanks reduce pump starts/stops. Each start causes wear, so fewer cycles mean longer pump life.

Q4: Can I use this for other pump sizes?
A: Yes, but adjust flow rate accordingly. The calculator works for any pump if you input its actual flow rate.

Q5: What's typical for residential systems?
A: Most 3/4 HP residential systems use 20-40 gallon tanks with 6-10 GPM flow rates and 1-2 minute run times.