Internal Diesel Storage Tank dimensions

[ShridaviM]

I’m currently trying to estimate the capacity of a sub-base diesel tank beneath a standby generator. Unfortunately, the specifications for this particular unit are unavailable as it is an older model. While a newer, custom-built generator is intended to replace it, we are working with limited information for the existing setup.
The information known is as follows:
- Brand: Massey Ferguson

Key Specifications (based on research):​

• Prime Power (PRP): 300 kW / 375 kVA
• Standby Power (LTP): 330 kW / 412.5 kVA
• Frequency: 60 Hz
• Speed: 1800 RPM
• Voltage: 480V, 3-phase
• Alternator: Leroy-Somer LL5014L
• Winding Configuration: 6/4
• Control Panel: 4001E Series
• Engine: Typically powered by Perkins or AGCO Power engines

In your experience, does measuring the tank externally (using visible dimensions) introduce significant error due to factors like internal baffling or wall thickness, or would it generally provide a reasonably accurate estimate?

 

[waross]

I would allow about 1/4 inch for wall thickness and allow at least a 1" air space on top.

 

[LittleInch]

Just allow 5% less volume from external dimensions and you'll be fine.

 

[TugboatEng]

Do you have any requirements for how long this needs to run at power? You should start there. If this is an emergency generator it may be required to meet an equivalent to US EPA Tier 3. These engines often have significantly higher BSFC numbers than any other rating.