Guide to Contamination Standards - Industrial Fluid Services

1 61 Guide to Contamination StandardsThis guidebook is aimed at engineers, technicians and quality control personnel involved in Contamination control. Its purpose is to make available accepted and widely-used cleanliness specifi cation levels for liquid tables in this Guide allow users of using automatic portable particle counters to see the relationship between raw particle counts at various sizes and the reporting code numbers of various Contamination NOTE ON THE FIGURES USEDNote that some of the table entries are defi ned as cumulative counts ( > 6 m ) and others are defi ned as differential counts ( 6 14 m ).Instances of particle sizes given as m refer to ACFTD ( Air Cleaner Fine Test Dust) distributions.

2 Instances of particle sizes given as m(c) refer to MTD ( ISO Medium Test Dust) Standards are in counts per volume, and provide easy methods for converting particle counts into limits that are simple to interpret. By noting the requirements of the standard, particle counts can be accurately converted to Contamination Cleanliness CodeHydraulic Fluid ContaminationISO code numberNumber of particles per mlMore thanUp to and including2220 00040 0002110 00020 000205 00010 000192 5005 000181 3002 500176401 code numbersType of systemTypical componentsSensitivity23 / 21 / 17 Low pressure systems with large clearancesRam pumpsLow20 / 18 / 15 Typical cleanliness of new hydraulic oil straight from the pressure heavy Industrial systems or applications where long-life is not criticalFlow control valvesCylindersAverage19 / 17 / 14 General machinery and mobile systemsMedium pressure.

3 Medium capacityGear pumps/motorsImportant18 / 16 / 13 World Wide Fuel Charter cleanliness standard for diesel fuel delivered from the fi lling station quality reliable systemsGeneral machine requirementsValve and piston pumps/motorsDirectional and pressure control valvesVery important17 / 15 / 12 Highly sophisticated systems and hydrostatic transmissionsProportional valvesCritical16 / 14 / 11 Performance servo and high Pressure long-life Aircraft machine tools, servovalvesCritical15 / 13 / 09 Silt sensitive control system with very high reliabilityLaboratory or aerospaceHigh performance servovalvesSuper criticalNOTE: The three fi gures of the ISO code numbers represent ISO level Contamination grades for particles of >4 m(c), >6 m(c) and >14 m(c) Acceptable Contamination Codes64 The NAS 1638 cleanliness standard was developed for aerospace components in the US and is still widely used for Industrial and aerospace fl uid power fi gures are differential counts, and the NAS class is usually reported as a single fi gure representing the maximum allowed particle counts ( worst case) for designated particle size range5 15 m15 25 25 50 50 100 >100 mNAS classes (based on maximum Contamination limits, particles per 100ml)

4 0012522410025044820150089163121 000178326132 0003566311244 00071212622458 0001 425253458616 0002 8505069016732 0005 7001 01218032864 00011 4002 025360649128 00022 8004 05072012810256 00045 6008 1001 44025611512 00091 00016 2002 88051212102 4000182 40032 4005 7601 024 NAS 1638 Table65 Note that this standard is technically identical to ISO Contamination limits (particles per ml)MTD>4 m(c)>6 m(c)>14 m(c)>21 m(c)>38 m(c)>70 m(c)ACFTD>2 m>5 m>15 m>25 m>50 m>100 mSize codeABCDEF000195761431000390152275100780 30454102011 560609109204123 1201220217397136 2502 43043276132412 5004 860864152264525 0009 7301 730306538650 00019 5003 460612106187100 00038 9006 9201 220212328200 00077 90013 9002 450424649400 00015 600027 7004 90084812810800 00031 100055 4009 8001 7002561116 000062 3000111 00019 6003 39051212320 000125 0000222 00039 2006 7801 024 MTD ISO11171 (Calibration or optical microscope count particle size based on projected area equivalent diameter)ACFTD ISO4402 (Calibration or optical microscope count particle size based on longest dimension)

5 SAE AS4059 rev E Table66 The GOST standard is developed by the Technical Committee of Standardization TK 184 Ensuring Industrial Cleanliness introduced by the Government of by the Inter-governmental Committee of Standardization Metrology and Certifi cation (Protocol No. 19 dated 24 May 2001).Size range5 10 m10 25 m 25 50 m50 >100 mParticle Contamination level by class (particles per 100ml)0084100016820013216300263324103125 63820425012512305500250254161 000500506272 0001 00010012484 0002 00020025698 0004 00040050121016 0008 000800100251131 50016 0001600200501263 00031 500315040010013 63 000630080020014 125 00012 5001 60040015 25 0003 15080016 50 0006 3001 60017 125 0003 150 GOST 17216-2001 Table67 The Navy Standard for Hydraulic Fluids used for aircraft hydraulic systems is defi ned in the Aviation Hydraulics Manual (1989)

6 , Table 2-1, Navy Standard for Particulate STANDARD FOR HYDRAULIC FLUIDS USED FOR AIRCRAFT HYDRAULIC SYSTEMSP article Contamination Level by ClassParticle size in m0123456 Number of particles per 100ml5 102 7004 6009 70024 00032 00087 000 128 00010 256701 3402 6805 36010 70021 40042 00025 50932103807801 5103 1506 50050 1001628561102254301000>10013511214192 NAV AIR 10-1A-17 Table68 Percent Contamination vs. PPM (parts per million)PercentPPM100%1 000 00010%100 0001%10 litre= 1 000 ml1 PPM= 1 l in 1 litreExample 1400 PPM in 1 litre= 400 lExample 2A reading of 250 PPM equates to a quantity of absorbed water in a 400 litre capacity system of Code Comparison TableThe comparisons relate to particle count data only.

7 To conform to any particular standard, reference should be made to the recommended experimental 4406 BS 5540/4 codesDefence Std. 05/42 NAS 1638 SAE 749 Table ATable B13 / 11 / 08214 / 12 / 093015 / 13 / 104116 / 14 / 09400F16 / 14 / 115217 / 15 / 0940017 / 15 / 10800F17 / 15 / 126318 / 16 / 1080018 / 16 / 111300F18 / 16 / 137419 / 17 / 111 300200019 / 17 / 148520 / 18 / 122 00020 / 18 / 134400F20 / 18 / 159621 / 19 / 134 4006300F21 / 19 / 161022 / 20 / 136 30022 / 20 / 171123 / 21 / 1415 00023 / 21 / 181224 / 22 / 1521 00025 / 23 / 17100 000 PPM Conversion Tabl