Contamination Control
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Technical committeeTypeAcronymISO 2943CommitteePublished year1998Description
This International Standard specifies a method of verifying the compatibility of materials comprising a hydraulic fluid power filter element with a designated fluid, by verifying the ability of the filter element to maintain its collapse burst rating after being subjected to the designated system fluid at a high and/or low temperature.
The filter element mounting seal is not included as part of the element.
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Technical committeeTypeAcronymISO 2942CommitteePublished year2018Description
This document specifies a bubble-point test method applicable to filter elements used in hydraulic fluid power systems. It can be used both to verify the fabrication integrity of a filter element (by checking the absence of bubbles) and to permit the localization of the largest pore of the filter element by determining the first bubble point.
NOTE Verification of fabrication integrity is used to define the acceptability of the filter elements for further use or testing.
The first bubble point is established through continuation of the fabrication integrity test. It is under no circumstances a functional characteristic of a filter element; in particular, it cannot be used to estimate filtration rating, efficiency or retention capacity and is intended to be used for information only.
This document specifies a method to normalise fabrication integrity and bubble point data to a standard value of surface tension when test fluids other than 2-propanol are used.
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Technical committeeTypeAcronymISO 2941CommitteePublished year2009Description
ISO 2941:2009 specifies a method for verifying the collapse/burst pressure rating of a hydraulic fluid power filter element, i.e. the capability of a filter element to withstand a designated differential pressure at the normal (i.e., intended direction of) flow, by means of pumping contaminated fluid through the filter element until either collapse/burst occurs or the maximum expected differential pressure is reached without element failure.
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Technical committeeTypeAcronymISO 27407CommitteePublished year2010Description
ISO 27407:2010 specifies a means of marking filters to communicate filter performance characteristics of interest to users. This marking can be used with either the standards referenced in ISO 27407:2010 or with any standard that has been harmonized with any referenced standard. ISO 27407:2010 applies to the marking of information only on the filter; the customer can request that the same information be specified on the product drawing or as part of the product packaging.
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Technical committeeTypeAcronymISO 23309CommitteePublished year2020DescriptionTechnology
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Technical committeeTypeAcronymISO 23181CommitteePublished year2007Description
ISO 23181:2007 specifies a method for determining the resistance of a hydraulic filter element to flow fatigue when subjected to high viscosity fluid, using a uniformly varying flow rate up to a predetermined terminal differential pressure and a controlled waveform.
It establishes a method for verifying the ability of a filter element to withstand the flexing caused by cyclic differential pressures induced by a variable flow rate.
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Technical committeeTypeAcronymISO 21018-1CommitteePublished year2008Description
ISO 21018-1:2008 specifies methods and techniques that are applicable to the monitoring of particulate contamination levels in hydraulic systems. It also describes the relative merits of various techniques so that the correct monitor for a given application can be selected.
The techniques described in ISO 21018-1:2008 are suitable for monitoring the general cleanliness level in hydraulic systems, the progress in flushing operations and support equipment and test rigs.
ISO 21018-1:2008 can also be applicable for other liquids (e.g. lubricants, fuels and process liquids).
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Technical committeeTypeAcronymISO 18413CommitteePublished year2015Description
ISO 18413:2015 specifies the content of an inspection document that specifies both the cleanliness requirement for the specified hydraulic fluid power component and the inspection method to be used for evaluating its cleanliness level. In addition, guidelines for relevant extraction methods and analysis methods are given.
Determination of what constitutes as an appropriate cleanliness level requirement for any particular component is beyond the scope of ISO 18413:2015. ISO 12669 provides a method of determining the required cleanliness of a hydraulic system. ISO TR 10686 provides a method of relating the required cleanliness of components to the required cleanliness of the hydraulic system.
For the purposes of ISO 18413:2015, approved functional liquids are considered to be components.
ISO 18413:2015 is applicable to the particulate contamination on the wetted surfaces and volumes of any hydraulic fluid power system component. Appearance defects and liquid or gaseous contamination are not covered by ISO 18413:2015.
ISO 18413:2015 does not address safety problems that might arise from hazardous materials, operations, and equipment associated with its use. The user of ISO 18413:2015 is responsible for establishing appropriate safety and health practices and determining the applicability of regulatory limitations prior to use.
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Technical committeeTypeAcronymISO 18237CommitteePublished year2017Description
ISO 18237:2017 specifies:
- test equipment, test circuit and a procedure for the evaluation of the water separation capabilities of a dehydrator;
- a procedure for preparing test fluid;
- a procedure for obtaining and analysing the test fluid samples.
ISO 18237:2017 applies only to those dehydration units that can dry a hydraulic fluid to less than 20 % of the hydraulic fluid's water saturation level at the test temperature.
ISO 18237:2017 provides a test procedure that yields reproducible results for dehydrator water removal performance so that the performance of candidate units is compared on the same basis using the same test fluid.
This procedure can be used to test the dehydrator's capabilities on different types of hydraulic fluids at different conditions. Parts of the procedure might need to be changed to suit the hydraulic fluid's characteristics. For example, the testing of hydraulic fluids with high water solubility (many synthetic and fire-resistant fluids) needs higher concentrations of water at the start of the test; the testing of hydraulic fluids with zinc-based additives needs modifications to the Karl Fischer analysis procedure. However, comparison of performance can be made under the conditions defined in ISO 18237:2017.
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Technical committeeTypeAcronymISO 16908CommitteePublished year2014Description
ISO 16908:2014 specifies a test procedure to thermally condition a hydraulic filter element and simulate cold start, such as that which can be encountered in mobile machinery applications. It is intended to provide a procedure that yields reproducible results and can be used prior to other filter element performance tests, such as those specified in ISO 11170.
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