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The Importance of ISO Cleanliness Codes                                                          5/14/10 10:34 PM




 The Importance of ISO Cleanliness Codes
 Tags: contamination control

 The International Organization for Standardization (ISO) has developed a code system called ISO
 Cleanliness codes, a universal standard for measuring and reporting particulate contamination levels in
 fluids. ISO 4406:99 is the newest and most commonly used cleanliness code. It is assigned on the basis
 of the number of particles per unit volume greater than 4, 6 and 14 microns. The numbers are given in
 this specific order for consistency in comparison. Each code represents a range of solid particles present
 in a lubricant.

 What are ISO Cleanliness Codes?
 First, particle count analysis is conducted on a representative sample of the fluid in a system. The
 particle count test provides the quantity and micron size of the various solid contaminants in the fluid.
 The actual particle count and subsequent ISO Cleanliness Code are compared to the target code for the
 system. If the actual cleanliness level of a system is worse than the desired target, corrective action is
 recommended.

 Different mechanical systems have distinct levels of cleanliness that are required for optimum life and
 minimum component wear. Contaminants in a system accelerate wear, reduce efficiency, increase
 operating costs and can cause significant downtime.

 Typically, new fluids are not clean fluids. Bulk lubricants from blending plants can range from 19/17/15
 to 17/14/13, while sealed drum lubricants can have cleanliness codes as high as 22/21/19. In contrast,
 highly filtered fluids may have a code of 16/14/11 or lower.

 Importance of Code Compliance
 High ISO Cleanliness codes indicate high levels of particulate contamination in the oil, which increase
 wear and shorten the lives of both machinery and lubricants. However, if a company maintains a
 sophisticated and effective contamination control program, the codes can be used to achieve increased
 efficiency and reduced downtime.

 The codes are also used as a basis for comparison, to understand how equipment performs under
 specific cleanliness levels. Maintenance personnel typically use the codes to evaluate the need for
 various levels of contamination protection.

 ISO Cleanliness codes themselves do not differ for various components. There are no set standards
 outside a handful of original equipment manufacturer recommendations, but Table 1 provides a fluid
 cleanliness guide for hydraulic systems.




http://www.machinerylubrication.com/Articles/Print/800                                                 Page 1 of 4
The Importance of ISO Cleanliness Codes                                                         5/14/10 10:34 PM




                                          Table 1. Typical Cleanliness Recommendations

 Generally, the tighter the tolerance on the component’s metal-to-metal surfaces, the tighter the
 cleanliness code. For instance, servo valves on hydraulic systems are more susceptible to contamination-
 related failures than low-speed gearboxes. Therefore, the hydraulic reservoir fluid will require a lower
 ISO code (cleaner fluid) than the gearbox. This knowledge allows maintenance departments to focus on
 preventing failures instead of treating them, and prompts them to employ enhanced tactics to keep
 contamination out of the hydraulic reservoir.

                                                         Click Here to see Figure 1

 Contamination Prevention and Removal
 There are numerous methods available to meet the appropriate cleanliness codes, which vary according
 to equipment and environment. The main objective is to stop contamination from initial entry, because
 studies show that it is approximately ten times more cost-efficient to prevent contamination than it is to
 remove it once it is present in a system. Specific solutions include quality breathers, hydraulic sleeves
 and improved storage and handling of fluids.

 Several technologies exist for the removal of solid contaminants from a lubrication system. The most
 widely used method is filtration, followed by centrifuge and electrostatic technologies.

 It is also important to institute a contamination control program for the establishment and monitoring of
 appropriate target cleanliness codes for machinery, storage and dispensing of lubricants, periodic
 cleaning of reservoir tanks and storage vessels, and installation of breathers to reduce ingression of
 contaminants. Oil analysis can be used for tracking trends to determine the value of various preventive
 maintenance efforts.

 Some of the major lubricant manufacturers offer programs to help control fluid contamination and
 maximize lubricant investment values. For instance, ChevronTexaco’s IsoClean™ Solutions offers fluid
 conditioning services to remove damaging particulates from system fluids and IsoClean™ storage
 containers to provide fluid contaminant protection and improve facility and system cleanliness. Desiccant
 breathers created by Des-Case® Corporation reduce airborne particulate and water contamination, which

http://www.machinerylubrication.com/Articles/Print/800                                                Page 2 of 4
The Importance of ISO Cleanliness Codes                                                           5/14/10 10:34 PM



 are leading causes of lubricant-related equipment failure. Petrolink USA, Inc., offers on-site lubricant
 reconditioning and preventive maintenance services to manufacturing facilities in the Midwest, Northeast
 and Southeastern areas of the United States.

 Industry Utilization of ISO Cleanliness Codes
 Industry as a whole is beginning to implement solutions to achieve compliance with ISO Cleanliness
 codes. Manufacturers of machinery are establishing target cleanliness codes for systems and are also
 providing extended warranty considerations for end-users who maintain long-term system hygiene as
 part of their reliability programs.

 In addition, end-use customers are becoming more educated about contamination control and as a
 result, are creating buy-in from upper management to employ solutions that optimize reliability.
 Companies are implementing programs to measure their system cleanliness and provide tools for
 removing contaminants. They can also utilize life extension tables to illustrate potential benefits in
 reducing system contamination from high to low levels, along with capturing the economic value of
 these solutions.

                              Click Here to see Table 2. New Cleanliness Level (ISO Cosde)

 Moving to Proactive Maintenance
 It can be difficult to convince maintenance staff of the importance of complying with and relying on the
 value of ISO Cleanliness codes. Due to the recent economy, maintenance departments are usually
 squeezed for time and money. Also, because contaminants are microscopic and invisible to the eye,
 most planners are unaware of the harm these unseen contaminants can cause to system reliability.
 Therefore, new tactics can often be seen as burdensome and inconvenient.

 However, with recent emphasis on education and training, more maintenance personnel are learning
 about the problems associated with contamination. Once appreciative of the benefits that improved
 cleanliness offers, most maintenance departments are eager to travel the road to less downtime and
 improved reliability and profitability. Nevertheless, the transition can sometimes be tough, because while
 the maintenance department must deal with typical issues such as rebuilds, outages and frequent oil
 changes, it must simultaneously execute new measures that require extra time. Plus, depending on the
 equipment and environment, it is possible that benefits may not be seen for an extended period of time.
 Consequently, this paradigm shift requires a great deal of discipline and commitment from the
 maintenance staff.

 Cases from the Field
 There are many cases where compliance with a higher standard of cleanliness has significantly improved
 operations at industrial facilities. For instance, the authors assisted a leading national independent
 petroleum refiner to institute all-inclusive contamination control programs. The petroleum refiner has
 significantly reduced lubricant spending along with upgrading its products to Group II and synthetics.
 They have experienced fewer maintenance failures over the last three years, along with significantly
 reducing lubricant purchases.

 A major Midwest power plant realized a lubricants cost savings of 53 percent over a five-year period
 through better housekeeping measures and improved filtration, which included the use of desiccant
 breathers. After several months of practicing these improved processes, oil analysis reports showed a
 substantial decrease in silicon levels. The ISO level set for new oil supplied was 18/17/14. When the

http://www.machinerylubrication.com/Articles/Print/800                                                  Page 3 of 4
The Importance of ISO Cleanliness Codes                                                          5/14/10 10:34 PM



 first in-service sample was taken, readings were 15/14/12, indicating that the oil was cleaner than when
 it came in the door. By consistently maintaining levels below code, the plant has achieved a four-fold
 extension of lubricant life. The same oil has been in service since October 2002 and based on sampling
 trends and sustainable cleanliness codes, plant technicians are expecting to extend its life to as much as
 five to seven years.

 Several years ago, Petrolink worked with a major wheel hub manufacturing facility in the Midwest who
 was experiencing large numbers of pump, valve and cylinder failures. The contamination levels in most
 of the systems were significantly higher than established targets and the maintenance department was
 primarily focused on repairing failed equipment.

 The company implemented its preventive maintenance service program at the customer plant, which
 involved analysis, reservoir cleaning, fluid reclamation, filtration upgrades and system flushing. The
 results were staggering: In the first year, the plant reduced component usage and failures and
 unscheduled downtime by 60 percent, allowing maintenance staff to concentrate on proactive
 maintenance activities versus reactive. This resulted in bottom-line savings of $450,000.

 These case studies help underline the huge savings and increased efficiency that industrial facilities can
 achieve through reliability-based maintenance programs that effectively monitor system cleanliness and
 remove contaminants. By implementing these programs, combined with the effective utilization of ISO
 Cleanliness codes as part of an efficient contamination control plan, increased efficiency and reduced
 downtime can be achieved. This means significant benefits for a company’s bottom line and enduring
 success in today’s highly competitive global economy.




http://www.machinerylubrication.com/Articles/Print/800                                                 Page 4 of 4

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The importance of iso cleanliness codes

  • 1. The Importance of ISO Cleanliness Codes 5/14/10 10:34 PM The Importance of ISO Cleanliness Codes Tags: contamination control The International Organization for Standardization (ISO) has developed a code system called ISO Cleanliness codes, a universal standard for measuring and reporting particulate contamination levels in fluids. ISO 4406:99 is the newest and most commonly used cleanliness code. It is assigned on the basis of the number of particles per unit volume greater than 4, 6 and 14 microns. The numbers are given in this specific order for consistency in comparison. Each code represents a range of solid particles present in a lubricant. What are ISO Cleanliness Codes? First, particle count analysis is conducted on a representative sample of the fluid in a system. The particle count test provides the quantity and micron size of the various solid contaminants in the fluid. The actual particle count and subsequent ISO Cleanliness Code are compared to the target code for the system. If the actual cleanliness level of a system is worse than the desired target, corrective action is recommended. Different mechanical systems have distinct levels of cleanliness that are required for optimum life and minimum component wear. Contaminants in a system accelerate wear, reduce efficiency, increase operating costs and can cause significant downtime. Typically, new fluids are not clean fluids. Bulk lubricants from blending plants can range from 19/17/15 to 17/14/13, while sealed drum lubricants can have cleanliness codes as high as 22/21/19. In contrast, highly filtered fluids may have a code of 16/14/11 or lower. Importance of Code Compliance High ISO Cleanliness codes indicate high levels of particulate contamination in the oil, which increase wear and shorten the lives of both machinery and lubricants. However, if a company maintains a sophisticated and effective contamination control program, the codes can be used to achieve increased efficiency and reduced downtime. The codes are also used as a basis for comparison, to understand how equipment performs under specific cleanliness levels. Maintenance personnel typically use the codes to evaluate the need for various levels of contamination protection. ISO Cleanliness codes themselves do not differ for various components. There are no set standards outside a handful of original equipment manufacturer recommendations, but Table 1 provides a fluid cleanliness guide for hydraulic systems. http://www.machinerylubrication.com/Articles/Print/800 Page 1 of 4
  • 2. The Importance of ISO Cleanliness Codes 5/14/10 10:34 PM Table 1. Typical Cleanliness Recommendations Generally, the tighter the tolerance on the component’s metal-to-metal surfaces, the tighter the cleanliness code. For instance, servo valves on hydraulic systems are more susceptible to contamination- related failures than low-speed gearboxes. Therefore, the hydraulic reservoir fluid will require a lower ISO code (cleaner fluid) than the gearbox. This knowledge allows maintenance departments to focus on preventing failures instead of treating them, and prompts them to employ enhanced tactics to keep contamination out of the hydraulic reservoir. Click Here to see Figure 1 Contamination Prevention and Removal There are numerous methods available to meet the appropriate cleanliness codes, which vary according to equipment and environment. The main objective is to stop contamination from initial entry, because studies show that it is approximately ten times more cost-efficient to prevent contamination than it is to remove it once it is present in a system. Specific solutions include quality breathers, hydraulic sleeves and improved storage and handling of fluids. Several technologies exist for the removal of solid contaminants from a lubrication system. The most widely used method is filtration, followed by centrifuge and electrostatic technologies. It is also important to institute a contamination control program for the establishment and monitoring of appropriate target cleanliness codes for machinery, storage and dispensing of lubricants, periodic cleaning of reservoir tanks and storage vessels, and installation of breathers to reduce ingression of contaminants. Oil analysis can be used for tracking trends to determine the value of various preventive maintenance efforts. Some of the major lubricant manufacturers offer programs to help control fluid contamination and maximize lubricant investment values. For instance, ChevronTexaco’s IsoClean™ Solutions offers fluid conditioning services to remove damaging particulates from system fluids and IsoClean™ storage containers to provide fluid contaminant protection and improve facility and system cleanliness. Desiccant breathers created by Des-Case® Corporation reduce airborne particulate and water contamination, which http://www.machinerylubrication.com/Articles/Print/800 Page 2 of 4
  • 3. The Importance of ISO Cleanliness Codes 5/14/10 10:34 PM are leading causes of lubricant-related equipment failure. Petrolink USA, Inc., offers on-site lubricant reconditioning and preventive maintenance services to manufacturing facilities in the Midwest, Northeast and Southeastern areas of the United States. Industry Utilization of ISO Cleanliness Codes Industry as a whole is beginning to implement solutions to achieve compliance with ISO Cleanliness codes. Manufacturers of machinery are establishing target cleanliness codes for systems and are also providing extended warranty considerations for end-users who maintain long-term system hygiene as part of their reliability programs. In addition, end-use customers are becoming more educated about contamination control and as a result, are creating buy-in from upper management to employ solutions that optimize reliability. Companies are implementing programs to measure their system cleanliness and provide tools for removing contaminants. They can also utilize life extension tables to illustrate potential benefits in reducing system contamination from high to low levels, along with capturing the economic value of these solutions. Click Here to see Table 2. New Cleanliness Level (ISO Cosde) Moving to Proactive Maintenance It can be difficult to convince maintenance staff of the importance of complying with and relying on the value of ISO Cleanliness codes. Due to the recent economy, maintenance departments are usually squeezed for time and money. Also, because contaminants are microscopic and invisible to the eye, most planners are unaware of the harm these unseen contaminants can cause to system reliability. Therefore, new tactics can often be seen as burdensome and inconvenient. However, with recent emphasis on education and training, more maintenance personnel are learning about the problems associated with contamination. Once appreciative of the benefits that improved cleanliness offers, most maintenance departments are eager to travel the road to less downtime and improved reliability and profitability. Nevertheless, the transition can sometimes be tough, because while the maintenance department must deal with typical issues such as rebuilds, outages and frequent oil changes, it must simultaneously execute new measures that require extra time. Plus, depending on the equipment and environment, it is possible that benefits may not be seen for an extended period of time. Consequently, this paradigm shift requires a great deal of discipline and commitment from the maintenance staff. Cases from the Field There are many cases where compliance with a higher standard of cleanliness has significantly improved operations at industrial facilities. For instance, the authors assisted a leading national independent petroleum refiner to institute all-inclusive contamination control programs. The petroleum refiner has significantly reduced lubricant spending along with upgrading its products to Group II and synthetics. They have experienced fewer maintenance failures over the last three years, along with significantly reducing lubricant purchases. A major Midwest power plant realized a lubricants cost savings of 53 percent over a five-year period through better housekeeping measures and improved filtration, which included the use of desiccant breathers. After several months of practicing these improved processes, oil analysis reports showed a substantial decrease in silicon levels. The ISO level set for new oil supplied was 18/17/14. When the http://www.machinerylubrication.com/Articles/Print/800 Page 3 of 4
  • 4. The Importance of ISO Cleanliness Codes 5/14/10 10:34 PM first in-service sample was taken, readings were 15/14/12, indicating that the oil was cleaner than when it came in the door. By consistently maintaining levels below code, the plant has achieved a four-fold extension of lubricant life. The same oil has been in service since October 2002 and based on sampling trends and sustainable cleanliness codes, plant technicians are expecting to extend its life to as much as five to seven years. Several years ago, Petrolink worked with a major wheel hub manufacturing facility in the Midwest who was experiencing large numbers of pump, valve and cylinder failures. The contamination levels in most of the systems were significantly higher than established targets and the maintenance department was primarily focused on repairing failed equipment. The company implemented its preventive maintenance service program at the customer plant, which involved analysis, reservoir cleaning, fluid reclamation, filtration upgrades and system flushing. The results were staggering: In the first year, the plant reduced component usage and failures and unscheduled downtime by 60 percent, allowing maintenance staff to concentrate on proactive maintenance activities versus reactive. This resulted in bottom-line savings of $450,000. These case studies help underline the huge savings and increased efficiency that industrial facilities can achieve through reliability-based maintenance programs that effectively monitor system cleanliness and remove contaminants. By implementing these programs, combined with the effective utilization of ISO Cleanliness codes as part of an efficient contamination control plan, increased efficiency and reduced downtime can be achieved. This means significant benefits for a company’s bottom line and enduring success in today’s highly competitive global economy. http://www.machinerylubrication.com/Articles/Print/800 Page 4 of 4