1、 Reference number ISO 28522:2009(E) ISO 2009INTERNATIONAL STANDARD ISO 28522 First edition 2009-02-15 Ships and marine technology Hydraulic oil systems Guidance for assembly and flushing Navires et technologie maritime Les systmes hydrauliques de ptrole Directives pour assembler et rincer ISO 28522:
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6、 below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedISO 28522:2009(E) ISO 2009 All rights reserv
7、ed iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Recommended guidelines on assembly 1 3.1 General. 1 3.2 Shock test 2 4 Recommended guidelines for flushing 2 5 Pressure testing 2 6 Commissioning . 3 ISO 28522:2009(E) iv ISO 2009 All rights reservedForeword ISO (the Internati
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12、such patent rights. ISO 28522 was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee SC 3, Piping and machinery. INTERNATIONAL STANDARD ISO 28522:2009(E) ISO 2009 All rights reserved 1 Ships and marine technology Hydraulic oil systems Guidance for assembly and flushi
13、ng 1 Scope This International Standard provides guidance for assembly and flushing of hydraulic oil systems. The aim of the flushing process is twofold: to remove dirt from the erection, installation, and to demonstrate that the pipes and the system as a whole are sufficiently clean. This Internatio
14、nal Standard gives guidelines to ensure that pipes and components are mounted and tested correctly. It also gives practical conditions for the flushing oil and filter. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated referenc
15、es, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 28521: 1) , Ships and marine technology Hydraulic oil systems Guidance for grades of cleanliness and flushing 3 Recommended guidelines on assembly 3.1 Gen
16、eral Before assembling it shall be checked that blank-offs on pipes and components are undamaged. If blank-offs are damaged, cleaning shall be repeated. After the pipe system is assembled, it shall be blown through with dry high-pressure air or nitrogen. In order to remove loose dirt and/or dry out
17、the pipes, lint-free cloths may be pulled through the pipes before connection to components. Testing for leakage of the pipe system is done with dry high-pressure air, and/or soap and water (with bypassed/blanked-off components). Leakage tests may be postponed during the shock and pressure testing p
18、rocedure. Specified flush oil (system or special oil) shall be used to fill the system. System components shall be bypassed. Flush oil, pumped through a filter when filling, is to be checked carefully. Breathing and refilling shall be secured. 1) To be published. ISO 28522:2009(E) 2 ISO 2009 All rig
19、hts reserved3.2 Shock test The pipe system shall be shock tested at least 25 times at a specified test pressure (with components bypassed). Pump stations, assembled units and components that have not been pre-tested for cleanliness shall be flushed separately, unless they are delivered in a clean co
20、ndition. This also applies to pipe systems if space on-board does not allow flushing of the assembled pipe systems. NOTE Flushing the pipe system is possible by means of a separate flush-rig. 4 Recommended guidelines for flushing Before/during flushing the following shall be observed. a) The flush-r
21、ig must be equipped with the correct filter in relation to x , the “beta ratio”. xis defined as follows: (number of particles filter intakes x m)/(number of particles filter discharges x m) where “x” is particle size in micrometres (m). b) To avoid a large loss of pressure, equivalent pipe dimension
22、s should be connected and flushed separately. Circuits are always connected in series. c) All built-in components are to be by-passed or blanked off. d) A vibrating unit may be used during flushing. e) The recommended flow velocity shall be determined from ISO 28521: 2) , Table 2. f) The flush oil t
23、emperature shall be at least that of expected system service temperature, although not exceeding 60 C. If the flush oil is disposed of after flushing, a maximum of 80 C is acceptable. In cold and windy conditions the system may be covered by tarpaulins. It must be checked whether the pump can operat
24、e at the reduced viscosity due to the increased oil temperature. g) The flushing procedure is to be maintained until satisfactory results are observed, see ISO 28521: 2) , Table 1. h) With the flushing rig operable, system components, blanked-off earlier, are connected to the system according to the
25、 service schedule. Flushing oil level shall be maintained. i) Activation sequence for good performance for all built in components is to be demonstrated and system working pressure is to be raised to normal working pressure simultaneously. j) Check flush-oil cleanliness level. 5 Pressure testing Pre
26、ssure testing according to specification shall be done at this stage (with components by-passed or blanked-off) in order to verify pipe strength, system rigidity and integrity. 2) To be published. ISO 28522:2009(E) ISO 2009 All rights reserved 3 6 Commissioning The following events shall be consider
27、ed in sequence when commissioning the system: a) If non-system oil is used during flushing, it shall be replaced by designated system oil. When filling with clean system oil, a filter shall be used. b) When the system is properly aligned and oil levels have been verified, the system pump units are t
28、o be started. c) The need for breathing and refilling the oil system shall be observed. Pressure regulating and relief valves are to be adjusted to proper settings. d) The system supplier representative shall be invited to acknowledge an acceptable level of cleanliness. e) The system may be started
29、as per normal service instructions for commencing the system performance test, see ISO 28521: 3) , Table 1. f) When documentation for achieved cleanliness is requested, proceed according to ISO 28521: 3) , Table 1. 3) To be published. ISO 28522:2009(E) ICS 47.020.99 Price based on 3 pages ISO 2009 All rights reserved
