1、INTERNATIONAL STANDARD ISO 15734 First edition 2001-06-01 Reference number ISO 15734:2001(E) ISO 2001 Ships and marine technology Hydrostatic release units Navires et technologie maritime Dispositifs de largage hydrostatiqueISO 15734:2001(E) ii ISO 2001 All rights reserved PDF disclaimer This PDF fi
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6、 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.ch Web www.iso.ch Printed in SwitzerlandISO 15734:2001(E) ISO 2001 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldwide federat
7、ion 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 committe
8、e. 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
9、with the rules given in the ISO/IEC Directives, Part 3. 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 draw
10、n to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 15734 was prepared by Technical Committee ISO/TC 8, Ships and marine technolo
11、gy, Subcommittee SC 1, Lifesaving and fire protection.INTERNATIONAL STANDARD ISO 15734:2001(E) ISO 2001 All rights reserved 1 Ships and marine technology Hydrostatic release units 1 Scope This International Standard specifies performance and testing requirements for hydrostatic release units used in
12、 conjunction with float-free lifesaving appliances including inflatable liferafts and Emergency Position Indicating Radio Beacons (EPIRB s). Hydrostatic release units which comply with this International Standard and which have been formally approved by the cognizant Maritime Safety Administration m
13、ay be considered to comply with the 1974 Safety Of Life At Sea Convention (SOLAS 74) and the IMO Life-Saving Appliances Code, as amended. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Stan
14、dard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated bel
15、ow. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 9227:1990, Corrosion tests in artificial atmospheres Salt spray tests. 3 General requirements 3.1 Construction A hyd
16、rostatic release unit used in the float-free arrangements of a survival craft or EPIRB shall be so constructed that the materials used are compatible so as to prevent malfunction of the unit; particular care shall be taken to ensure that metallic-coated parts are not used where damage to the coating
17、 from contact with other parts could adversely affect the functioning of the unit, it has drains to prevent the accumulation of water in the hydrostatic chamber when the unit is in its normal position, each structural part connected to the painter system has a strength not less than that required by
18、 the painter, it can readily be removed for replacement or annual servicing, materials and components shall be corrosion-resistant and not affected by seawater, oil or detergents, it can function properly throughout an air temperature range of to , it can function properly throughout a seawater temp
19、erature range of to , it can automatically release the float-free lifesaving appliance at a depth of not more than , and it cannot release prematurely when seawater washes over the unit. 3.2 Markings The unit shall be marked permanently on its exterior with its manufacturer, type, and serial number,
20、 a means of identifying its date of manufacture, 30 C + 65 C 1 C + 30 C 4mISO 15734:2001(E) 2 ISO 2001 All rights reserved the maximum-capacity liferaft with which the unit may be used, if the unit has such a limitation, and a means of indelibly marking its date of expiry, if it is of the disposable
21、 type. 3.3 Servicing record plate If the unit is of a type which requires annual servicing, it shall be provided with a permanently attached plate to maintain a record of servicing. 3.4 Operating and maintenance instructions Operating and maintenance instructions and information shall be provided in
22、 a clear and concise form in the appropriate language or languages and shall include the following: general description of the unit; installation instructions; any on-board maintenance requirements; servicing requirements. 3.5 Weak link 3.5.1 Materials A weak link used in conjunction with a hydrosta
23、tic release unit in a float-free arrangement shall be made from a material which is corrosion-resistant and not affected by seawater, oil or detergent, have the ends either whipped or heat treated, when made of cordage, and have each end looped around a thimble and secured with a locking ferrule, wh
24、en made from a flexible wire. 3.5.2 Strength A weak link used in conjunction with a hydrostatic release unit in a float-free arrangement of an inflatable liferaft shall be of sufficient strength to pull the painter out of the liferaft container, operate the liferaft inflation system, and break under
25、 a tensile force of between and . 4 Prototype tests 4.1 Technical tests 4.1.1 Testing sequence At least two prototype hydrostatic release units shall be tested in the sequence listed below. No parts may be renewed or repaired between the tests. a) Corrosion-resistance test (4.1.2). b) Temperature cy
26、cling test (4.1.3). c) Submergence and manual release test (4.1.4). 1,8 kN 2,6 kNISO 15734:2001(E) ISO 2001 All rights reserved 3 d) Strength test (4.1.5). e) Membrane-material technical tests (4.1.6). 4.1.2 Corrosion resistance test The hydrostatic release units shall be exposed to a salt water spr
27、ay test ( sodium chloride solution) in accordance with ISO 9227, at a temperature of for without interruption. After completion, the hydrostatic release units shall show no corrosion which could affect their efficient functioning, and shall then be subjected to the following tests, after which they
28、shall continue to function efficiently. 4.1.3 Temperature tests 4.1.3.1 The hydrostatic release units shall be alternately submitted to surrounding temperatures of and . These alternating half-cycles need not follow immediately after each other, and the following procedure is acceptable: a n h al f
29、- cy cl ea t t ob ec om p le t edino ned a y; the units removed from the hot chamber and left exposed under normal room conditions until the next day; an half-cycle at to be completed in one day; the units removed from the cold chamber and left exposed under normal room conditions until the next day
30、; repeat the above procedure for a further nine cycles. 4.1.3.2 On completion, the release shall be capable of being released manually if it is designed for manual release. 4.1.3.3 Following the temperature cycling, as specified in 4.1.3.1, one hydrostatic release unit shall be taken from a stowage
31、temperature of and shall operate in seawater at a temperature of . Another hydrostatic release unit shall be taken from a stowage temperature of and shall then operate in seawater at a temperature of . 4.1.4 Submergence and manual release test 4.1.4.1 Each hydrostatic release unit submerged in water
32、 or a water-filled pressure-testing tank shall, when a buoyant load equal to its designated capacity is applied, release at a depth of between and . On completion of these tests and resetting, the hydrostatic release unit shall be capable of being released manually if it is designed to allow manual
33、release of the unit. It shall then be opened for inspection and shall show no significant signs of corrosion or degradation. 4.1.4.2 On being opened up for inspection, the unit shall show no significant signs of corrosion or degradation which could affect its efficient functioning. 4.1.5 Strength te
34、st Each hydrostatic release unit, if intended to form part of the painter system of a liferaft, shall be subjected to a tensile load of at least for a period of . If the release is to be fitted to a liferaft approved to carry more than 25 persons, the tensile load shall be increased to . On completi
35、on, the unit, if designed with a manual release, shall be capable of being released manually. 4.1.6 Membrane-material tests for temperature resistance 4.1.6.1 Requirements Two membranes shall show no visible signs of cracking when tested for resistance to cold and heat as specified in 4.1.6.2 and 4.
36、1.6.3, respectively. 5% + 35 C 3 C 160 h 30 C + 65 C 8h 65 C 8h 30 C 30 C 1 C + 65 C + 30 C 1,5 m 4 m 10 kN 30 min 15 kNISO 15734:2001(E) 4 ISO 2001 All rights reserved 4.1.6.2 Resistance to cold T e m p e r a t u r e : . Exposure time: . Flex testing: (stretching both inside and outside face). 4.1.
37、6.3 Resistance to heat T e m p e r a t u r e : . Exposure time: 7 days. 4.1.7 Resistance to oil, seawater, and detergent tests 4.1.7.1 Requirements Two membranes shall show no signs of any deterioration when tested for resistance to oil, seawater and detergent as specified in 4.1.7.2 to 4.1.7.4. 4.1
38、.7.2 Surface resistance to oil T e m p e r a t u r e : t o . T yp eo fo i l:AS TMO ilNo .1orNo .5 ,o rISOO ilNo .1 . Exposure time: on each side. 4.1.7.3 Resistance to seawater Two membranes shall be immersed in a sodium chloride solution at to for a period of 7 days. 4.1.7.4 Resistance to detergent
39、s Two membranes shall be immersed in at least three different typical ship detergent solutions at to for ape ri odo f7da ys . 4.2 Performance test 4.2.1 This test shall be performed using the smallest and the largest liferafts, or the EPIRB, with which the hydrostatic release unit may be used. If th
40、e occupant range between the smallest and largest liferaft exceeds 25 persons, the intermediate-size liferaft shall also be tested. In the case of a liferaft, place a liferaft horizontally into a rack with its painter line and the hydrostatic release unit arranged as fitted on board a ship. In the c
41、ase of an EPIRB, install the EPIRB and the hydrostatic release unit on a rack, arranged as fitted on board a ship. Attach sufficient weight to the rack to submerge the raft or EPIRB, then lower it into the water of depth at least in the orientations as specified in a) to d) (see Figure 1; liferaft o
42、nly shown for clarity): a) Horizontally; b) Tilted and then with the hydrostatic release unit at the upper side; 30 C 30 min 180 + 65 C +18 C2 0 C 3h 5% +18 C2 0 C +18 C2 0 C 5m 45 100 ISO 15734:2001(E) ISO 2001 All rights reserved 5 c) Tilted and then with the hydrostatic release unit at the lower
43、side; d) Vertically. 4.2.2 Under each of these conditions, the hydrostatic release unit shall release the liferaft or EPIRB at a depth of between and . 4.3 Weak-link tensile test 4.3.1 Using a dynamometer, a weak link assembled as fitted in the float-free arrangements of a lifesaving appliance shall
44、 be tensile tested until it breaks. 4.3.2 The test shall be repeated on a minimum of 5 weak links. Figure 1 Performance test 45 100 1,5 m 4 mISO 15734:2001(E) 6 ISO 2001 All rights reserved 4.3.3 All 5 weak links shall break within the range of to . 5 Production tests 5.1 Requirements Production tes
45、ts for hydrostatic release units shall be performed in accordance with 5.2 and 5.3, and for associated weak links as specified in 5.4. 5.2 Visual and dimensional examination A random sample of units shall be selected from each assembled lot in accordance with Table 1. The selected samples shall unde
46、rgo an examination of visual and dimensional characteristics by comparison to their approved plans, with their acceptance based upon Table 1. 5.3 Submergence test 5.3.1 Reusable units Each reusable hydrostatic release unit in a production lot shall be tested by applying a buoyant load of its designe
47、d capacity while the device is submerged in water or in a water-filled pressure-testing tank. The unit shall automatically release the load at a depth of less than . The unit shall be reassembled and, if fitted with a manual release, shall be released manually. Units which do not pass this submergen
48、ce test shall be removed from the production lot as unacceptable, but may be reworked and included in a subsequent lot. 5.3.2 Disposable units A random sample of units shall be selected from each assembled lot in accordance with Table 2. Each unit selected shall be tested in accordance with 5.3.1, e
49、xcept it is not required that the unit be reassembled after the test. Any failures shall cause the entire production lot to be rejected. Table 1 Sampling for visual and dimensional examination No. of units in production lot (defectives) No. of units in sample Rejection No. 15 and under All 16 to 25 15 1 26 to 40 25 1 41 to 110 35 2 111 to 180 50 2 181 to 300 75 3 301 t
