TEMPERATURE
Oxidation accelerates with operating temperature.
Heat shortens the useful life of the charge.
Published: 500–2,000 hours under a clean, dry air stream below 100 °C. Continuous duty: approximately 1,000 hours.
The published oil change interval is 500 to 2,000 operating hours. That range is stated for a clean, dry air stream and an operating temperature below 100 °C.
For continuous duty the manufacturer gives approximately 1,000 hours, and states that harsh conditions require a shorter interval still.
A plant at 40–45 °C in heavy dust and high humidity meets neither stated condition. The manufacturer does not publish a corrected figure for that service, so the daily oil-colour check is the practical control.
| Task | Published interval |
|---|---|
| Oil change — published range | 500–2,000 operating hours, for a clean, dry air stream below 100 °C |
| Oil change — continuous duty | approx. 1,000 hours, and sooner in harsh conditions |
| Oil separation element | 2,000 hours, or a minimum of twice yearly |
| Air intake filter, check / clean | 40–200 hours |
| Air intake filter, replace | After a maximum of four blow-out cleanings, and at least once a year |
Source: published maintenance instructions, oil-lubricated rotary vane series.
The intake filter interval is given as a range of 40 to 200 hours. The range is wide because the interval is set by the air the pump is breathing rather than by the pump. In heavy airborne dust the lower figure applies. A filter cleaned on a 200-hour cycle in a dusty plant spends most of its service life partially blocked.
Oil life is governed by temperature, contamination and water ingress. A plant in this corridor supplies all three continuously.
The manufacturer's application engineering department has been asked for a corrected interval for continuous operation at 40–45 °C in heavy dust, and whether a high-temperature grade is offered for this duty. No such figure appears in any published document we have located.
The manufacturer specifies a visual check of the oil. It is the only diagnostic available in the absence of a derated interval.
| Oil appearance | Condition | Action |
|---|---|---|
| Light amber | Serviceable | Continue in service. |
| Dark | Oxidised or contaminated | Change the charge. |
| Milky white | Water in the oil | Run on gas ballast for 1–2 hours to drive off the water. If the oil does not clear, change the charge. |
Source: published maintenance instructions, oil-lubricated rotary vane series.
Milky oil is common in plants with high ambient humidity, particularly where a hot pump is stopped and allowed to cool. It indicates condensed water rather than a mechanical fault.
Record oil condition daily against running hours, and record how many hours each charge lasted. After three changes the plant has an interval measured under its own conditions, which is more reliable than a figure quoted for it by a supplier.
The oil separation element, the intake filter, the vane set and the float chamber are specific to the pump variant. They are identified from the nameplate on the pump, which carries the model and the build.
A photograph of the nameplate is sufficient to identify the consumable set for that pump and to quote it. Where the nameplate is unreadable, the plant number and a photograph of the pump body are normally enough.
A food-grade vacuum oil to NSF H1 in ISO 100 is available. It is the same viscosity grade as the mineral ISO 100 oil in general service, so it is a drop-in on grade. Whether food-grade lubrication is required depends on the contact path, which is a HACCP determination rather than a supplier's recommendation.
Calculated from the published intervals above, a single pump in continuous duty consumes in the order of €850–1,200 per year in consumables, excluding vanes.
Derived from the published intervals. Not a manufacturer-published figure. Vanes are excluded because no vane life is published for the oil-lubricated series.
Multiplied by the installed pump count, this gives the annual consumable budget for the vacuum line, and it is the basis on which a planned annual order is built.
Same manual. Same pump. One cleaned at the 40-hour end of the manufacturer's range, one at the 200.
| Figure | Value | Source |
|---|---|---|
| Oil change, published range | 500–2,000 hrs, for a clean dry air stream below 100 °C | Manufacturer maintenance instructions |
| Oil change, continuous duty | approx. 1,000 hrs, sooner in harsh conditions | Manufacturer maintenance guidance |
| Oil separation element | 2,000 hrs / min. 2× yearly | Manufacturer maintenance instructions |
| Intake filter check | 40–200 hrs · max 4 cleanings · new min. annually | Manufacturer maintenance instructions |
| Oil colour diagnostic | Amber / dark / milky, then gas ballast 1–2 hrs | Manufacturer maintenance instructions |
| Food-grade vacuum oil | NSF H1, ISO 100, drop-in on grade | Manufacturer product documentation |
| Annual consumables, per pump | approx. €850–1,200 | Derived from the intervals above. Not a published figure. |
No corrected oil interval is published for continuous operation at 40–45 °C in heavy dust. The question has been put to the manufacturer's application engineering department, together with a request for a high-temperature grade for this duty.
When an answer is received it will be published on this page, attributed. Until then this page carries no derated figure, because none exists in any manufacturer document we have been able to locate.
The published range is 500 to 2,000 operating hours, stated for a clean, dry air stream and an operating temperature below 100 °C. For continuous duty the manufacturer gives approximately 1,000 hours, and sooner in harsh conditions. A plant at 40–45 °C in heavy dust meets neither stated condition, and no corrected figure is published for it. The daily oil-colour check is the practical control: light amber is serviceable, dark oil should be changed, milky oil indicates water.
Water has condensed into the charge, which is common in high humidity. The published remedy is to run the pump on gas ballast for one to two hours to drive off the water. If the oil does not clear, change the charge.
The published range is every 40 to 200 hours. In heavy dust the lower figure applies. The filter may be blown out a maximum of four times and must be replaced at least once a year.
From the pump nameplate. The element is specific to the pump variant, and a photograph of the nameplate is sufficient to identify it and to quote it.
Parts: Vacuum pumps · Lubricants & oils
Bilingual Arabic/English. Symptom index, published intervals, the elastomer question, and what one pump consumes in a year. Printable. Free. Ask and we will send it.