Spill and fire response: two coolant families, two procedures

One word, two very different responses

A plant room stores "coolant". The word suggests a benign, water-like fluid. Heat transfer fluids do not all respond to a spill the same way, and the two procedures that apply illustrate why.

For leaks of LM-1, LM-3 or LM-5 — the alcohol-based and mixed-alcohol coolants — the instruction is to evacuate personnel, open doors and windows, and dilute with water.

For leaks of LM-6, LM-6A, LM-6B, LM-9D, LM-9E, LM-7, LM-11, LM-11A, LM-11B, LM-11C, LM-11D, the LM-15 series, the LM-16 series or the LM-17 series — the anhydrous, silicone, thermal-oil and dielectric grades — the instruction is to evacuate personnel, open doors and windows, and rinse with detergent-containing water.

Two procedures, and the difference is not arbitrary.

Why detergent for one group and water for the other

The dividing line is miscibility.

Several families are water-insoluble — the LM-6, LM-7 and LM-11 series among them, along with the silicone LM-15 range. These are designed for loops where water is a contaminant, not a diluent.

That design decision has a spill consequence. Water dilutes a miscible fluid: the concentration drops, the volume is easier to handle, and the material can be washed away. Water does not dilute an insoluble fluid. It sits on top, runs underneath, or carries the fluid with it — spreading the spill across a wider floor area and potentially into drains. A detergent-containing wash does something different: it helps lift and emulsify the residue so it can actually be collected.

It is the same property that governs commissioning. The reason those loops need a dry, closed system with nitrogen protection is the reason their spills need a different response — see why anhydrous coolants need a dry loop.

Fire response follows the same split

The extinguishing guidance separates the same way:

Two differences are worth noting. The second group adds dry chemical, CO₂ and soil as options — media suitable for combustible liquids and for situations where water would be undesirable. And the instruction to evacuate at once is stated more firmly for that group.

The non-combustible grades have no flash point. That is a meaningful property, not a marketing line: the salt-based LM-8 family is described as non-combustible with no flash point, and LM-8A likewise. Where a fluid cannot form a flammable vapour layer, the fire risk changes character.

Flash point is the number that matters, not the label

If a plant handles several grades, the flash point column is the one to read across the range.

A flash point of −32 °C means the fluid produces ignitable vapour below any ambient temperature a plant will ever see. A flash point of +16 °C is a different problem again. And "no flash point" describes a fluid that does not form a flammable vapour at all under the test.

The practical consequence is that the storage and handling rules cannot be uniform. A specific set — LM-1, LM-2, LM-3, LM-5, LM-6, LM-6A, LM-6B, LM-7, LM-11 and LM-11F — is classified as combustible and explosive hazardous materials, and the storage precautions follow from that classification.

What a storage area needs

The storage precautions apply across the combustible list and are short enough to state directly:

• Keep away from sources of fire.
• Prevent static electricity.
• Prevent leakage.
• Maintain ventilation.

Ventilation is repeated in the general precautions for all products, not only the combustible ones: storage and use areas must be well ventilated. That is a requirement on the room, not on the drum.

Two more statements apply across the whole range and are easy to lose in a plant's procedures. All LM series coolants and their performance enhancers are described as harmful if ingested and are not to be inhaled in large quantities. And the products must not be used for any purpose other than as heat-transfer fluids — a line that matters in plants where a drum of fluid is available and someone finds a second use for it.

The document that actually governs your site

These figures are for reference, and the contract and related technical agreements prevail. Detailed storage, handling and safety requirements are set out in the product's enterprise standards, safety data sheet and safety labels.

That is the right hierarchy to work with:

1. The current SDS for the exact model is the controlling document for your site's procedures.
2. The enterprise standard and safety labels carry the detailed requirements.
3. The product classification — water-miscible or water-insoluble — tells you which response group applies.

The common failure is treating a spill procedure written for a glycol-type fluid as if it covered an anhydrous one, or the reverse. Both are in the same product range and neither is interchangeable.

What to do with this

If your site handles more than one grade, check the spill kit and the emergency procedure against the family, not the product label. The two questions to answer in advance are whether the fluid in the drum mixes with water, and what its flash point is.

The system protection page covers the maintenance programmes that reduce the chance of a spill in the first place, and the documentation request is the route to the current SDS for the exact grade.

Where the safety data sheet governs

Your site's emergency procedures stand, and not every product safety requirement is covered here. The figures quoted here are reference values, and detailed handling requirements sit in the safety data sheet and enterprise standard for each product. Use the current SDS for the grade on site as the governing document, and confirm your procedures against it.