Oil and chip vacuum for steel workshops: how to collect and separate

Every machine tool in a steel workshop produces two waste streams that end up mixed: metal chips and the coolant or oil that carried them away from the cut. When chips and sludge build up in sumps and around machines, they are usually cleared by hand with shovels, buckets and absorbents while the machine stands idle. An oil and chip vacuum for steel workshops collects both in one pass and separates them, so each can go to the right place.

For a workshop manager, the questions are practical: which machine fits our fluids and chips, how a sump clean should be organized, and where the limits are. This application guide answers them in that order.

How can oil and chips be collected and separated?

They are drawn up together by suction, separated inside the vacuum by a basket, and then discharged separately. The mixture enters the tank through the hose; a perforated or grated basket holds back chips and coarse sludge, while the liquid drains through into a separate chamber.

DUPUY states that the grated metal baskets in its oil and chip vacuums let the emulsion “be instantly separated from sludge and slurries”, “facilitating the recycling of the sucked oil”. The liquid is then emptied by pump or drain: DUPUY lists a drain pump on the Oilvac 130P and an ejector pump on the Oilvac 130. Whether recovered coolant goes back into the machine is a decision for your fluid management, based on its condition; the vacuum only makes the choice possible.

DUPUY’s short film presents the Oilvac 200 T recovering and separating oil, metal chips and sludge; watch where the chips stay and where the liquid goes, and compare that with the layout of your own sumps.

Which fluid and chip details decide the right oil and chip vacuum?

The fluid, the chip form and the volumes decide the machine, so describe them before comparing models. The table shows what to tell a supplier and why each item matters.

DUPUY’s oil and chip range includes the Chipvac 200, 400 and 400M and the Oilvac series from the Oilvac 60 to the Oilvac 600HV; DUPUY describes the Oilvac 500 as a “vacuum cleaner for coolant, oil and chips”. The range page gives no tank volumes, so take capacities and pump data from the datasheet of the model you are offered.

How should coolant sump cleaning be planned?

Plan sump cleaning as a scheduled maintenance task with a defined end point, not as an emergency job. A typical sequence:

1. Schedule with production. Use planned stops, and group machines so one vacuum serves several in a shift.
2. Stop and isolate the machine. Follow your site’s isolation procedure before anyone reaches into the sump or the chip conveyor area.
3. Collect liquid and chips. Vacuum the sump contents into the separator, then remove settled sludge from corners and baffles.
4. Decide the fluid’s destination. Return filtered coolant only if its condition meets your fluid management criteria; otherwise send it to the site’s waste route.
5. Clean, refill and record. Remove remaining residues, refill or top up the coolant, check its concentration, and record what was removed and when.

If machine surfaces also need degreasing, dry steam is one option. Machine conditioning with dry steam and oil recovery covers how the tasks can be sequenced, and dry steam degreasing during machine maintenance covers the steam step on its own.

Where else does an oil and chip vacuum fit in a steel workshop?

Beyond sumps, the same equipment clears chips and coolant around machines, beneath chip conveyors and on floors after spills. DUPUY also lists “stationary vacuum units on board the machine” among its industrial vacuum families, which may suit machines that need frequent chip removal; ask for details for your machine type.

Airborne oil mist is a separate problem that a floor-level vacuum does not solve. DUPUY’s SKY oil mist extractors work on “the principle of coalescence”, and DUPUY says the collected oil “can therefore be recovered and reused”.

DUPUY presents the Oilvac 130 as a vacuum made to extract, recover and separate lubricants or oil from metal chips; note how the liquid is emptied and ask whether that suits where your fluid needs to go.

What safety and environmental checks apply?

Check the hazards of what you are collecting before choosing the machine, and agree where every output goes before the first clean.

• Sharp chips. Use suitable gloves and lifting aids when emptying baskets and containers.
• Skin contact with fluids. Follow the coolant’s safety data sheet for handling and personal protection.
• Waste routes. Recovered chips and spent coolant follow your site’s own waste and recycling procedures. AFE supplies equipment and advice; it does not provide waste transport or disposal.

What should you measure to judge the result?

Measure the job before and after the change, so the decision rests on your own workshop’s data rather than on general claims. The useful measures are simple to record on a sheet beside each machine:

• Time per sump clean, from machine stop to restart, including emptying the vacuum.
• Cleaning frequency per machine, and how often unplanned stops are caused by chip build-up.
• Coolant top-up volume per month, which shows how much fluid is recovered or lost.
• Chips and sludge removed per clean, which checks the sizing assumptions behind the equipment.
• Mixed residues sent off site, before and after separation is introduced.

Where a unit can be made available for a trial, testing it on the machines with the heaviest chip load is the quickest way to collect these figures and confirm the model before buying several.

Which mistakes do workshops make with oil and chip vacuums?

• Using a general wet and dry vacuum. Without separation, the operator ends up with a tank of mixed waste that is hard to empty, reuse or recycle.
• Sizing on tank volume alone. Basket capacity, pump rate and emptying method decide how many sumps can be cleaned per shift.
• Ignoring fines. Grinding sludge passes coarse baskets, so ask how fines are handled.
• No plan for the liquid. Decide in advance whether coolant returns to the machine, goes to a holding tank or to waste, and with which hose and pump.
• No spares. Baskets, filters, hoses and seals wear, so agree a spares list at the time of order.

How AFE supports oil and chip recovery in workshops

AFE supplies DUPUY oil and chip vacuums and industrial vacuums and helps workshop managers match the model to the fluid, chip load and sump layout. Through its MRO and consumables service, filters, hoses and core components can be planned with the equipment; because the units come from Italy through AFE’s Aqaba regional gateway, agree the spares list at the time of order.

Where machines also need degreasing, AFE’s industrial steam cleaning and degreasing service is a separate option. For fume from welding in the same workshop, see selecting welding fume extraction for fabrication bays, and find more guides in AFE’s steel insights.