Spill kits and response equipment

A spill kit is only useful if it is the right kind, big enough, close enough and fully stocked when the spill happens. Many sites have spill kits that fail one of those tests: an oil-only kit beside a battery charging station, a kit that holds 20 liters beside a 5,000-liter tank, a kit locked in a storeroom, or a kit whose absorbent pads were used up last month and never replaced. This lesson covers how to choose, place, maintain and use spill response equipment, including the protective equipment that keeps responders safe.

Types of absorbent

Absorbents soak up liquid so it can be collected and disposed of. They come in three main types, usually color-coded by manufacturers. Universal absorbents, often gray or green, soak up oils, water-based liquids, coolants and most mild chemicals. Oil-only absorbents, usually white, are made of materials such as polypropylene that repel water and soak up only oils and fuels. Because they float and do not take up water, they are the right choice for oil on a pond, a flooded ditch or a wet parking lot. Chemical or hazmat absorbents, often yellow or pink, are made to handle aggressive chemicals such as acids, caustics and oxidizers without reacting or breaking down.

Using the wrong absorbent can make things worse. Universal pads on an oil sheen in water soak up water and sink. Cellulose-based absorbents, made from paper or plant fibers, can react with strong oxidizers and acids and even catch fire. Clay-based granular absorbent on a large area makes a heavy, dusty mess. Each spill kit should be labeled with what it is for, and the safety data sheet for each chemical stored on site should be checked to confirm the absorbent is suitable.

Forms of absorbent

Absorbents come in several forms, each with a job. Pads and rolls are flat sheets for wiping up and covering small spills and drips. Socks, also called snakes, are long tubes filled with absorbent that are laid around a spill to contain it and stop it spreading, or across a doorway. Pillows are thick bags that soak up larger volumes, good for leaks under a drum or in a sump. Booms are long floating tubes used on water to contain and absorb oil; lesson 9 covers them. Loose granular absorbent is spread on floors to soak up liquid and to make surfaces less slippery.

What a kit contains

A typical general-purpose spill kit contains absorbent pads, socks and pillows; a drain cover or plug; heavy-duty disposal bags with ties and labels; a non-sparking shovel or scoop if flammable liquids may be involved; nitrile gloves, splash goggles and an apron or coveralls; and a laminated instruction card with the first steps and phone numbers. Larger kits come in wheeled bins or overpack drums, which can also serve as the container for the waste. Specialized kits add neutralizers for acids and bases, mercury absorbent for broken thermometers or switches, or extra protective equipment for chemical hazards.

Kits are rated by capacity: the volume of liquid the absorbents in the kit can soak up when fully used. A small kit for a vehicle might absorb 20 to 40 liters, a wheeled bin 100 to 250 liters, and a large overpack drum kit more. The capacity should be matched to the largest likely spill at that location, not the average one. Where the largest possible spill is much bigger, for example a full tank, the plan relies on secondary containment to hold most of it and on additional absorbent, pumps, vacuum trucks or contractors to recover it.

# How many absorbent items do you need? Capacities are illustrative; use the product label.
spill_l = 60
capacity = {"pad": 0.8, "sock (1.2 m)": 4.0, "pillow": 8.0}   # L absorbed per item
safety_factor = 1.5          # absorbents rarely reach full rated capacity in real use
need = spill_l * safety_factor
print(f"Spill {spill_l} L; plan for {need:.0f} L of absorbent capacity")
# Typical mix: socks to ring the spill, pillows for the pool, pads to finish
plan = {"sock (1.2 m)": 6, "pillow": 6}
used = sum(capacity[k] * n for k, n in plan.items())
pads = max(0, -(-(need - used) // capacity["pad"]))   # ceiling division
print(f"6 socks + 6 pillows = {used:.0f} L; add {int(pads)} pads to reach {need:.0f} L")
print(f"In US gallons: spill {spill_l/3.785:.1f} gal, plan for {need/3.785:.1f} gal")

Spill 60 L; plan for 90 L of absorbent capacity
6 socks + 6 pillows = 72 L; add 23 pads to reach 90 L
In US gallons: spill 15.9 gal, plan for 23.8 gal

Where to put spill kits

Spill kits must be close to where spills are likely, easy to see and never locked away. Good locations include beside fuel tanks and dispensers, at loading docks, in maintenance shops near hydraulic and oil storage, beside chemical storage rooms, at wash bays, on service trucks and in vehicles that carry fuel or chemicals. A kit should be reachable within a minute or two of the risk point, because that is about how long it takes a spill to reach a nearby drain. Kits should be marked with signs that can be seen from a distance, and access to them must be kept clear.

Some sites use a simple rule of thumb: a kit for every significant risk area, a kit within about 25 meters of any fuel transfer point, and a kit in every vehicle that carries more than small amounts of fuel or chemicals. Larger sites add a central response trailer or cache with extra absorbent, booms, pumps, drums and protective equipment for bigger spills.

Drain protection

Stopping a spill from entering a drain is often the single most important action, because once liquid reaches a storm drain it can be in a creek within minutes. Drain protection comes in several forms. Drain covers are heavy, flexible mats, often made of polyurethane, that are laid over a grate to seal it. Drain plugs and inflatable stoppers block pipe openings. Absorbent socks laid around a grate help but do not seal it. Some sites install permanent valves or inserts in catch basins that can be closed during a spill, or oil-water separators that trap floating oil before it leaves the site.

Drain covers must match the drains on site: a cover too small for the grate is useless. They should be stored right beside high-risk drains, and workers should practice placing them, because a cover laid on a dirty or uneven grate may leak. Before placing a cover, check that the liquid is not a flammable substance pooling under it in a way that creates a vapor hazard, and always follow the site plan.

Protective equipment

Responders must protect themselves before they touch a spill. The minimum for most small oil and fuel spills is chemical-resistant gloves such as nitrile, safety glasses or splash goggles, and footwear that will not soak up liquid. For corrosive chemicals, add a face shield, chemical apron or suit and suitable gloves as the safety data sheet directs. Section 8 of the safety data sheet lists the protective equipment needed. Never use cotton work gloves on solvents or fuels; they soak up the liquid and hold it against the skin.

Respiratory protection is a different matter. If a spill gives off vapor strong enough to need a respirator, it is usually beyond awareness-level response. Respirators must be selected, fitted and used under a respiratory protection program, as covered in HSE-240. Workers who have not been fit-tested and trained must not use them. The plan should say clearly that if vapor, odor or symptoms such as dizziness or eye irritation are present, workers withdraw and call for help.

Inspecting and restocking kits

Spill kits should be inspected on a schedule, often monthly, and after every use. The inspection checks that the kit is in its place, the seal is intact, all items on the contents list are present and in good condition, protective equipment fits and is not expired, the instruction card is legible and the phone numbers are current. A tamper seal makes it easy to see whether a kit has been opened. Anything used must be replaced immediately; many sites keep a stock of refill packs and make restocking part of closing out every spill.

Other response equipment

Larger sites and those with bigger risks may need more: hand pumps or air-operated pumps to transfer liquid from a leaking container, overpack and salvage drums to hold leaking drums, leak-sealing putty and plugs, non-sparking tools, portable berms that unfold to contain a leak, wet-dry vacuums rated for the liquids involved, and portable gas detectors to check for flammable vapor. Each piece of equipment needs trained users and regular checks. Lesson 7 explains how these items are used in a response.