When refilling foam concentrate storage, leaving space for expansion helps prevent which issue?

• A. Expansion-related leaks
• B. Contamination of concentrate
• C. Over-pressurization
• D. Thermal degradation

Answer: (A)

Foam concentrates can expand when temperatures rise or as components offgas. If a storage container is filled right to the brim, that extra volume has nowhere to go, causing pressure to build up and liquids to be forced past seals, gaskets, or connections. Leaving space for expansion—headspace—lets the vapor and small increases in volume escape or be accommodated without pushing liquid out, which prevents expansion-related leaks. Contamination and thermal degradation aren’t directly caused by not leaving headspace, and while over-pressurization can be related, the immediate and most direct issue addressed by expansion space is avoiding leaks from expansion.