Written by: Ray Krohn 

For critical operations, plant hold-up time is vital. This is the duration a compressed air system can sustain downstream pressure in the event of compressor failure.

What is Hold-Up Time?

Hold-up time measures how long your compressed air supply can maintain pressure and flow for downstream processes when the upstream compressors stop.

Why It Matters

Unexpected air loss can halt production, disrupt safety systems, and cause costly downtime. Correctly sized storage ensures critical devices remain operational during emergencies.

Differential Pressure: Key to Efficient Storage

Instead of designing large storage tanks at full system pressure, engineers calculate the pressure differential between normal operating pressure and minimum required pressure. This reduces tank size and cost while maintaining safety.

Using Booster Compressors for High-Pressure Storage

A small booster compressor can re-pressurize air into a smaller, high-pressure vessel. In an emergency, regulators maintain a safe downstream pressure. This system saves space and capital costs while providing reliable backup.

Real-World Example: Capital Savings

Implementing a high-pressure hold-up vessel with a booster compressor saved one client $86,180 in capital costs—reducing storage from 14,960 US gallons to just 2,760 US gallons without compromising plant safety.

Need Expert Guidance on Compressed Air Systems?
Contact our team at info@cae-ltd.ca to optimize your plant’s compressed air reliability, efficiency, and cost.