What an LVDH Machine Does

LVDH stands for Low Vacuum Dehydration. In a machine of this type the oil is warmed, then sprayed as a thin film inside a vacuum chamber. Under vacuum water boils off at a low temperature, so the oil needs only moderate heat. The vapour is drawn off and condensed, and the dried oil is pumped back to your tank.

The oil is filtered for particles on the way. Free and emulsified water goes first and dissolved water is brought down, but no process takes out every trace, so say what water level you need, and have the oil tested before and after if you want it shown.

As a general guide, whether vacuum dehydration suits an oil depends on the oil type, viscosity, temperature, the amount and form of water, and the result you need. We assess that before confirming a rental.

If you run an LVDH unit of your own, send its make and model and we confirm whether we can supply the spares.

LVDH spares

When an LVDH Machine Suits Your Oil, and When It Does Not

As a general guide:

Suits: hydraulic or lube oil with water in it, for example from a cooler or heat exchanger leak, condensation or washdown, where the oil is otherwise still within its supplier’s in-service limits.
Suits: a plant that wants the oil dried and returned to service instead of drained and replaced.
Does not suit: a fluid made to contain water, such as water-glycol hydraulic fluid or a water-mix coolant.
Does not suit: oil that is past its supplier’s in-service limits, for example badly oxidised oil, oil with its additives used up, or oil mixed with another product. Heavy sludge is usually better taken out by a centrifuge first.
Check first: oils with light, volatile components, because vacuum can draw them off. Ask us before you rent.

Details

Rental Terms

Written terms are issued with every quotation.

Rental terms
Item	Terms
Machine capacity and compatible oils	Hydraulic and lube oils. The capacity for your system is confirmed in the quotation.
Minimum rental period and charging basis	Charged per day for the rental period agreed in the quotation.
Delivery, collection and transport	Quoted for your site location.
Operator	Agreed in the quotation.
Power and utilities required	Confirmed with the quotation for your site.
Oil testing and reports	Agreed in the quotation if required.

What to Send to Check Suitability

The oil: type and grade, and the volume in the system.
The water problem: how the water got in, if you know, and any water test result.
Other results: send your latest oil report if you have one.
The site: where the machine will stand, and the power available there.
The dates: when you need it, and for how long.

How Renting Works

Requirement and Dates
Oil type, volume, test results if any, site and dates.
Suitability Check
An engineer confirms the machine suits the oil and the outcome you need.
Availability and Written Quote
We confirm a unit for your dates and send the terms.
Dispatch, Handover and Support
The unit arrives with the agreed connections; return inspection closes the rental.

Questions Buyers Ask

How long does it take to remove the water?

It depends on oil volume, viscosity, temperature and how much water is present. We estimate it after the suitability check; there is no universal processing time.

Does the enquiry reserve a machine?

No. A unit is reserved once availability is confirmed in writing and the order is accepted.

Can you test the oil before and after?

Testing can be included in the quotation if you need it.

Will it remove all the water?

It brings the water down. No method takes out every trace, and the level reached depends on the oil, its temperature and the time. Tell us the level you need, and have the oil tested before and after if you want it shown.

Is renting the machine the same as your on-site filtration service?

No. A rental gives you the LVDH machine for agreed days, and the quotation states who operates it. With the on-site service we do the job: our crew arrives with its own machines, the centrifuge and heater among them, filters the oil and measures the result. If you want the oil cleaned for you, ask about industrial oil filtration.