Buying guide
7 min read
How to select an industrial vacuum
Not every industrial vacuum application involves a hazardous location. Where the material is not combustible and the area is not classified, the specification is driven by ordinary engineering questions — what the material is, how far it has to travel, how long the unit runs, and who empties it. This is the general case; the hazardous one has its own guide.
- Establish first whether the hazardous-location question applies at all
- Duty cycle is a design requirement, not a usage pattern
- Wet and dry are different engineering problems
- Capacity is limited by handling weight, not container volume
First, rule the hazard question in or out
Before anything else, establish whether the material is combustible and whether the area is classified. If either is true, this is not the right guide — the equipment eligibility question changes completely and the selection follows a different order.
Combustibility is established by testing the material as your process generates it, because it depends heavily on particle size. Area classification is assigned by your own electrical or process engineer. Both are inputs you obtain rather than judgements a supplier can make for you.
Match the machine to the duty
Duty cycle is the parameter most often understated. A unit specified for intermittent housekeeping and then run for a full shift will not deliver its rated performance for long, and it will fail progressively rather than obviously.
The case that catches people out is the vacuum that quietly becomes part of the process — connected to a machine and running whenever the machine runs. That is a continuous-duty application even though nobody specified it as one, and it is worth identifying before purchase rather than after the second motor.
Wet, dry, or both
Liquid and dust are recovered by the same basic principle and almost nothing else in common. Dry filtration relies on a medium particles cannot pass; wetting that medium blinds it and it may never recover. Liquid recovery relies on separation and level control instead.
Combined units exist and work well within their design. What matters is using the correct configuration for the material at hand, and not allowing recovered wet and dry material to combine where that would create a slurry — or, with reactive materials, something worse.
Airflow, vacuum and distance
Airflow carries material along the hose; vacuum pressure lifts and dislodges it. They trade against each other, so specifying for a headline figure in one dimension usually costs the other. Light material over a long run is an airflow problem; dense material from a sump is a vacuum problem.
Distance matters more than most specifications assume. Every metre of hose, every bend and every reduction costs performance, and the loss accumulates faster than a simple proportion. Specify for the assembly you will actually use rather than for the machine alone.
Capacity, and who empties it
Container capacity is set by how much accumulates between emptying events, but the binding constraint is usually handling. Dense material makes weight the limit long before volume is, and a container sized generously on paper is one that gets emptied early because nobody can move it full.
Filter area belongs in the same conversation. Generous filter area keeps face velocity low, which sustains airflow as the filter loads and lengthens the interval between changes — and every change is a handling event.
If the answer to either first question is yes
If the material is combustible or the area is classified, use the explosion-proof selection guide instead. The eligibility question comes first there, and starting from duty cycle produces a specification that has to be redone.
Where you are unsure, describe the material and the process and we will tell you which conversation you are in.
Frequently asked questions
- How do I know if I need an explosion-proof unit?
- Two inputs settle it: whether the material is combustible, established by testing it as your process generates it, and whether the area is classified, assigned by your own electrical or process engineer. If either is yes, the hazardous-location selection applies.
- What counts as continuous duty?
- Any application where the unit runs for extended periods rather than in short bursts — most commonly one connected to a machine and running whenever that machine runs. It is a design requirement affecting motor, cooling and filter sizing, not a usage pattern.
- Should I specify for maximum suction?
- Rarely. Airflow and vacuum trade against each other, so maximising one costs the other. Light material over distance needs airflow; dense material from depth needs vacuum. Most real applications need a workable balance.
- Does hose length really matter?
- More than most specifications assume, and the loss accumulates faster than a simple proportion. Bends, fittings and reductions add to it. Size for the whole assembly rather than the machine on its own.
Talk to the manufacturer
Get the right explosion proof vacuum for your application.
Tell us what you need to vacuum and where. Our technical team will recommend the PrestiVac model best suited to your material, your classification and how hard you will work it — and because we build every unit ourselves, we can modify it to fit.
- Legally certified explosion proof
- Solid stainless steel construction
- Industry-best 3-year warranty
- Designed & manufactured in the USA
- 200+ vacuum versions