Foam Concentrate Analysis
in New Zealand.

Firefighting foam concentrate testing

Fixed and portable foam systems depend on concentrate that remains chemically stable, correctly stored, and compatible with the installed proportioning equipment. Laboratory analysis can identify deterioration, dilution, contamination, sediment, abnormal viscosity, or performance loss before a system is needed in an emergency. vslSafety coordinates representative shipboard sampling, compliant transport, specialist laboratory testing, and a report suitable for owner, class, or flag review.

Intervals and regulatory context

IMO MSC.1/Circ.1312 provides guidance for the performance and testing of foam concentrates used in fixed fire-extinguishing systems. A first periodical control is commonly expected within three years after supply and annual testing thereafter, subject to the concentrate type, maker instructions, flag, and class requirements. Additional analysis may be prudent after contamination, mixing products, prolonged high-temperature storage, system discharge, or uncertainty about batch identity. Changing restrictions on fluorinated substances also make accurate inventory and compatibility information important when planning replacement.

Typical laboratory scope

• Appearance, sediment, pH, specific gravity, viscosity, and freeze-point checks as applicable
• Expansion ratio, drainage time, and extinguishing-performance tests appropriate to the foam type
• Comparison with maker specifications, original batch data, or an approved reference sample
• Review of mixed concentrates and compatibility where a tank has been topped up
• Signed analysis report with sample identification, methods, results, conclusion, and recommendations

How to obtain a representative result

Send the vessel, port, foam maker and product, foam type and concentration, batch and supply date, tank capacity, quantity onboard, previous report, system type, and survey deadline. Samples should be drawn from agreed locations using clean compatible containers, sealed, labelled, and documented with a chain of custody. Do not mix or replace concentrate solely on a generic result: the maker, laboratory, class society, and flag requirements should be considered before corrective action.

Sampling, results, and common questions

Can crew send a sample directly?

Often yes, if the laboratory supplies instructions and approved containers and the vessel can draw a representative sample safely. The sample point, flushing, container cleanliness, quantity, labelling, sealing, and temperature exposure in transit all matter. For disputed, contaminated, or mixed tanks, independent attendance and a formal chain of custody provide stronger evidence.

What if two foam brands have been mixed?

Record both products, batches, quantities, and dates and consult the makers and class before further topping up. Similar nominal concentration does not prove chemical or performance compatibility. The laboratory may recommend additional compatibility and fire-performance tests. Replacement planning must also account for cleaning the tank and lines and confirming compatibility with seals and proportioning equipment.

Does laboratory analysis test the entire system?

No. It assesses the submitted concentrate sample against specified properties. Pumps, valves, proportioners, monitors, piping, nozzles, air supply, controls, and application rate require separate inspection and operational testing. A passing concentrate result cannot compensate for blocked nozzles or an incorrectly adjusted proportioner.

How should PFAS-related replacement be planned?

First establish the installed foam chemistry, regulatory deadlines in the vessel’s trading area, maker-approved alternatives, system compatibility, disposal route, and class or flag expectations. Avoid unplanned mixing. A replacement project may require tank cleaning, line flushing, component changes, revised documentation, crew instruction, and performance testing in addition to purchasing new concentrate.