--- title: Oil condition monitoring for lube oil monitoring on screw compressors description: Oil condition monitoring using in-line lube oil viscometers can protect a refinery's large hydrogen screw compressors. image: https://www.cambridgeviscosity.com/hubfs/2021-02-17-gas_screw_compressors.jpg --- [![CVI-by-PAC-RGB](https://www.cambridgeviscosity.com/hs-fs/hubfs/CVI-by-PAC-RGB.png?width=1320&height=291&name=CVI-by-PAC-RGB.png "CVI-by-PAC-RGB")](https://www.cambridgeviscosity.com) This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. # Cambridge Viscosity Blog ## [Oil condition monitoring for lube oil monitoring on screw compressors](https://www.cambridgeviscosity.com/blog/oil-condition-monitoring-for-online-lubrication-oil-monitoring-on-gas-screw-compressors) ** Feb 17, 2021 11:55:02 AM / by [Patrick Riley](https://www.cambridgeviscosity.com/blog/author/patrick-riley) - [Tweet](https://twitter.com/share) ![2021-02-17-gas_screw_compressors](https://www.cambridgeviscosity.com/hs-fs/hubfs/2021-02-17-gas_screw_compressors.jpg?width=1036&name=2021-02-17-gas_screw_compressors.jpg)Managing lubricant viscosity is essential to maintaining the health of a compressor in a process plant, because a single compressor failure can cost $10,000 a day or more in lost revenue. Considering it’s another $10,000 to rebuild a compressor, or more than $100,000 to replace a compressor, maintaining the health and performance of compressors is important. Many factors affect lube oil viscosity: - **Oxidation** occurs when churning lube oil foams, exposing more oil to surface air and causing oxidation, which lowers viscosity and threatens useful lubricant life. - **Dilution** results when lubricant oil is diluted with gas, such as methane, dropping viscosity. - **Bubbles** form as foaming oil churns against the screws or vanes of the compressor, instantly dropping the viscosity of the oil. - **Contamination** occurs when hydrocarbon vapors in the process mix with the lube oil The situation can be further aggravated by significant changes in temperature  – such as during start-up – that affect the viscosity of the underlying lube oil. A range of compressor failures can result. Rotary and thrust bearings can fail, which in turn causes wear on the rotor assembly. Replacing bearings is less costly than a total rebuild or replacement, but either way, the plant faces downtime. While refineries commonly perform monthly lab checks, the unpredictability of viscosity changes means that these monthly checks are not enough to prevent bearing failure and subsequent plant downtime.   ***“Despite using separators, the lubricant can become diluted by gas carry-over or contamination. If left unchecked, this can cause problems, especially during subsequent start-ups.” *** ***- Lead Engineer, ******Gulf Coast Refinery*** ### **Preventing Bearing Failure and Downtime** Refineries are finding that that monitoring lubricant temperature isn’t sufficient to protect compressor bearings, especially in applications where process starts and stops can occur. Despite using separators, the lubricant can become diluted by gas carry-over or contamination. If left unchecked, this can cause problems, especially during subsequent start-ups.  Refineries can protect their large hydrogen screw compressors to improve refinery uptime by adding in-line lube oil viscometers to all their new and existing units. In-line, in situ viscosity monitoring provides plant operations with real-time data on the lubricant viscosity. The [VISCOpro 2100](https://www.cambridgeviscosity.com/viscopro2100-online-viscosity-monitoring), along with a [301 in-line viscometer sensor](https://www.cambridgeviscosity.com/sensor-spcl301), provides real-time continuous monitoring of the compressor bearing lubrication fluid throughout equipment operations.  This saves lab and technician time, and reduces the chance of damaging the equipment. ### Results - Save $10,000+ a day by avoiding unplanned shutdowns caused by compressor failure - Identify contamination, oxidation, dilution, and bubbles - Monitor viscosity across wide temperature swings - Measure under pressures of 1,000 psi and temperatures up to 190 °C   --- We create a lot of great and relevant content, and we occasionally send out emails. Join our email list if you're interested.  [![Join Our Mailing List](https://no-cache.hubspot.com/cta/default/2542477/b063b8f8-b7d3-4656-b564-1a68f970ffb8.png)](https://cta-redirect.hubspot.com/cta/redirect/2542477/b063b8f8-b7d3-4656-b564-1a68f970ffb8)   Tags: [viscosity control](https://www.cambridgeviscosity.com/blog/topic/viscosity-control), [viscosity management](https://www.cambridgeviscosity.com/blog/topic/viscosity-management), [compressor viscosity](https://www.cambridgeviscosity.com/blog/topic/compressor-viscosity), [in-line viscometers](https://www.cambridgeviscosity.com/blog/topic/in-line-viscometers), [ViscoPro 2100](https://www.cambridgeviscosity.com/blog/topic/viscopro-2100) #### Written by [Patrick Riley](https://www.cambridgeviscosity.com/blog/author/patrick-riley) Vice President of Process Analytics [**](http://www.linkedin.com/company/pac) ### Subscribe to Email Updates - [Recent](https://www.cambridgeviscosity.com/blog/oil-condition-monitoring-for-online-lubrication-oil-monitoring-on-gas-screw-compressors#tab-1) - [Popular](https://www.cambridgeviscosity.com/blog/oil-condition-monitoring-for-online-lubrication-oil-monitoring-on-gas-screw-compressors#tab-2) - [Categories](https://www.cambridgeviscosity.com/blog/oil-condition-monitoring-for-online-lubrication-oil-monitoring-on-gas-screw-compressors#tab-3) [Viscometer Measurement: A Glimpse into Reservoir Fluid Dynamics](https://www.cambridgeviscosity.com/blog/viscometer-measurement-a-glimpse-into-reservoir-fluid-dynamics) posted at Sep 26, 2023 ![Viscosity Measurement: A glimpse into reservoir fluid dynamics](https://www.cambridgeviscosity.com/hs-fs/hubfs/2023-09-21-a-glimpse-into-reservior-fluid-dynamics-sm.jpg?length=80&name=2023-09-21-a-glimpse-into-reservior-fluid-dynamics-sm.jpg) [Part 3 - Challenges Optical Lens Manufacturers are Facing in 2023](https://www.cambridgeviscosity.com/blog/part3-challenges-optical-lens-manufacturers-facing-in-2023) posted at Aug 10, 2023 ![Optical lens manufacturers face three critical challenges in 2023](https://www.cambridgeviscosity.com/hs-fs/hubfs/23-06-28-what-challenges-are-optical-manufacturers-facing-in-2023-03.jpg?length=80&name=23-06-28-what-challenges-are-optical-manufacturers-facing-in-2023-03.jpg) [Part 2 - Challenges Optical Lens Manufacturers are Facing in 2023](https://www.cambridgeviscosity.com/blog/part2-challenges-optical-lens-manufacturers-facing-in-2023) posted at Aug 1, 2023 ![Optical lens manufacturers face three critical challenges in 2023](https://www.cambridgeviscosity.com/hs-fs/hubfs/23-06-28-what-challenges-are-optical-manufacturers-facing-in-2023-01%20copy.jpg?length=80&name=23-06-28-what-challenges-are-optical-manufacturers-facing-in-2023-01%20copy.jpg) [What Challenges are Optical Lens Manufacturers Facing in 2023?](https://www.cambridgeviscosity.com/blog/what-challenges-are-optical-lens-manufacturers-facing-in-2023) posted at Jun 29, 2023 ![Optical lens manufacturers face three critical challenges in 2023](https://www.cambridgeviscosity.com/hs-fs/hubfs/23-06-28-what-challenges-are-optical-manufacturers-facing-in-2023-01%20copy.jpg?length=80&name=23-06-28-what-challenges-are-optical-manufacturers-facing-in-2023-01%20copy.jpg) [Avoid compressor failures by monitoring lubricant viscosity](https://www.cambridgeviscosity.com/blog/avoid-compressor-failures-by-monitoring-lubricant-viscosity) posted at May 18, 2023 ![Monitor lubricant viscosity with the Visco Pro 2100](https://www.cambridgeviscosity.com/hs-fs/hubfs/23-05-11-avoid-compressor-failures%20copy.jpg?length=80&name=23-05-11-avoid-compressor-failures%20copy.jpg) ### Lists by Topic - 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