BS-ISO-16860-2005.pdf

BRITISH STANDARD BS ISO 16860:2005 Hydraulic fluid power Filters Test method for differential pressure devices ICS 23.100.60 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 16860:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2006 © BSI 2006 ISBN 0 580 48352 5 National foreword This British Standard reproduces verbatim ISO 16860:2005 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee MCE/18, Fluid power systems and components, to Subcommittee MCE/18/-/6, Contamination control, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 16860:2005(E) INTERNATIONAL STANDARD ISO 16860 First edition 2005-10-01 Hydraulic fluid power Filters Test method for differential pressure devices Transmissions hydrauliques Filtres Méthode d'essai pour les indicateurs de colmatage BS ISO 16860:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 1 4 Test equipment . 2 5 Test conditions . 2 6 Types of differential pressure devices. 2 7 Procedure for testing differential pressure devices and bypass valve condition signalling indicators. 2 8 Test requirements. 6 9 Marking 6 10 Data presentation 6 11 Identification statement (reference to this International Standard) 6 Annex A (informative) Typical types of differential pressure device used as filter accessories. 8 Annex B (informative) Round robin test results . 9 Bibliography. 10 BS ISO 16860:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 16860 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 6, Contamination control. BS ISO 16860:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction In hydraulic fluid power systems, power is transmitted and controlled through a fluid under pressure within an enclosed circuit. Filters maintain fluid cleanliness by removing insoluble contaminants. The filter element is the porous device that performs the actual process of filtration. The differential pressure device is an accessory that signals when a predetermined value of differential pressure across the filter element has been reached. It is normally used to signal when a restricted filter element should be replaced and, in cases where the device is linked to the bypass valve, signals the status of bypass valve condition. BS ISO 16860:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Hydraulic fluid power Filters Test method for differential pressure devices 1 Scope This International Standard provides a standard method for determining the operating characteristics of a differential pressure or bypass valve condition-signalling device used as an accessory to a hydraulic fluid power filter. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3448, Industrial liquid lubricants ISO viscosity classification ISO 3968, Hydraulic fluid power Filters Evaluation of differential pressure versus flow characteristics ISO 5598, Fluid power systems and components Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply. 3.1 actuation pressure differential pressure at which a pressure-operated visual indicator or electrical switch signals a change of condition 3.2 low temperature lockout device that prevents a differential pressure device or switch from actuating below a designated temperature but allows normal actuation above a higher designated temperature NOTE Low temperature lockouts prevent false signalling of a filter element during cold start conditions. 3.3 bypass valve condition signalling indicator device that provides an external signal, by visual or electrical means, of the status of the bypass valve. BS ISO 16860:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 4 Test equipment The following test equipment is required. 4.1 Test stand, capable of exceeding requirements of 7.4. 4.2 Test medium, with a viscosity of ISO VG 32 in accordance with ISO 3448, unless otherwise specified, or with a specified viscosity in accordance with the recommendation of the differential pressure device manufacturer, or a supply of compressed air, suitably filtered and regulated. 4.3 Low temperature box or environmental chamber, with a suitable enclosure that can be controlled to the desired temperatures for testing differential pressure devices that incorporate a low temperature lockout and that can confirm the lockout release temperature. 4.4 Temperature measuring device, with an accuracy of ± 0,5 °C. 4.5 Test block, able to contain a differential pressure device(s) so that the required tests can be performed (see 7.2, 7.3, 7.4 and 7.5). The fixture shall have a proof pressure at least 50 % higher than that of the item under test. It is recommended that the fixture be pressure tested to the proof pressure at least once per year, if it is used frequently. 5 Test conditions Unless specific test requirements dictate otherwise, all tests shall be conducted at room temperature. 6 Types of differential pressure devices The differential pressure device types described in Annex A are those generally considered to be in use and it is the intent of this International Standard to provide a means of determining their operating characteristics. For differential pressure device types or characteristics not covered by this International Standard, the manufacturer shall be consulted in order to determine details of the methods to be used to determine their operating characteristics. WARNING Differential pressure devices used as additions to a filter assembly may be rated for pressures in excess of the filter assembly. Test pressures should not exceed the maximum rated pressure of the filter assembly used for test. 7 Procedure for testing differential pressure devices and bypass valve condition signalling indicators 7.1 Actuation pressure test Filter housing method 7.1.1 Perform one of the following procedures which best simulates the device application. a) Remove the filter element from its housing and plug the filter element port (this allows the pressure to build up in the test housing and on the upstream side of the differential pressure device). b) Remove the filter element and install a flow-restricting orifice in the filter element port in the housing. The orifice should be sized to produce a differential pressure of approximately 75 % of the specified differential pressure device actuation pressure at 50 % of the rated filter flow rate. This will produce a differential pressure build-up in the test housing between the upstream and downstream sides of the device. BS ISO 16860:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 7.1.2 Connect the inlet port of the filter housing to the controlled pressure and flow source of the test stand. If the filter element port is plugged in accordance with 7.1.1 a), vent the outlet port to atmosphere. Venting to atmosphere will automatically give a back pressure of 0 (zero) gauge pressure and the inlet gauge pressure may be read directly. If the filter element port is plugged with an orifice in accordance with 7.1.1 b), connect the outlet port to the return line of the test stand with a pressure relief valve located downstream of the outlet pressure gauge and piloted by the pressure in the upstream line. Adjust the pressure-relief valve to maintain the upstream pressure equal to the maximum working pressure of the filter housing, unless otherwise specified. The differential pressure device actuation pressure is the difference between the inlet and outlet pressure gauge readings. If the test is performed at pressure, it is recommended that a differential pressure transducer be used in place of pressure gauges for improved measurement accuracy. 7.1.3 Install the differential pressure device into the filter housing in accordance with the manufacturers instructions. 7.1.4 If the differential pressure device is of the electrical or electronic type, make the appropriate electrical connections to a means of displaying either the actuation indication or the differential pressure. 7.1.5 Increase the inlet pressure to actuate the differential pressure device and record the pressure level at which the device actuates, then reduce the pressure to zero and, if necessary, manually reset the device. Repeat three times and calculate the average of the four values. 7.1.6 Increase the inlet pressure to about 85 % of the actuation pressure determined in 7.1.5. Increase the inlet pressure in increments of 5 kPa to 10 kPa (0,05 bar to 0,1 bar) and hold for 30 s ± 3 s at each increment. Continue to increase the pressure until the device actuates and record the actuation pressure. For auto-reset type bypass indicators, increase the pressure to 50 kPa (0,5 bar) above the actuation pressure measured. 7.1.7 Decrease the pressure in increments of 5 kPa to 10 kPa (0,05 bar to 0,1 bar) and hold for 30 s ± 3 s at each increment until the device resets or the device can be manually reset and record the pressure value on the report sheet. 7.1.8 Repeat 7.1.6 and 7.1.7 twice more and record the average of the three readings as the actuation pressure. 7.1.9 Verify that the device resets itself or can be reset manually. Failure to reset shall be cause for rejection. 7.2 Actuation pressure test Test block method 7.2.1 If air is used as the test medium, lubricate the internal surfaces of the device with a suitable lubricant that is clean and dry. Install the differential pressure device into the test block in accordance with the manufacturers instructions. 7.2.2 Connect the upstream port of the test block to a pressure source (either hydraulic or pneumatic) and pressure gauge and set the pressure relief valve or pressure regulator to a value 25 % higher than the expected setting of the device under test. Ensure that the downstream port is vented to atmosphere and is free of any obstructions. 7.2.3 If the device is of the electrical or electronic type, make the appropriate electrical connections to a means of displaying either the actuation indication or the differential pressure. BS ISO 16860:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 7.2.4 Increase the inlet pressure to actuate the differential pressure device and record the pressure level at which the device actuates, then reduce the pressure to zero and, if necessary, manually reset the device. Repeat three times, then calculate the average of the four readings. 7.2.5 Increase the inlet pressure to about 85 % of the average actuation pressure determined in 7.2.5. Increase the pressure in increments of 5 kPa (0,05 bar) to 10 kPa (0,1 bar) and hold for 30 s ± 3 s at each increment. Continue increasing pressure until the device actuates and record the actuation pressure value on the report sheet. For auto-reset type bypass indicators, increase the pressure to 50 kPa (0,5 bar) above the actuation pressure measured. 7.2.6 Decrease the pressure in increments of 5 kPa (0,05 bar) to 10 kPa (0,1 bar) and hold for 30 s ± 3 s at each increment until the device resets or the device can be manually reset, as required, and record the pressure value on the report sheet. 7.2.7 Repeat 7.2.5 a