ISO-8142-1990.pdf
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1、INTERNATIONAL STANDARD IS0 8142 First edition 1990-03-15 Thermal insulation - Bonded preformed man- made mineral fibre pipe sections - Specification Isolation thermique - Isolations de iuyaux en fibres minkales manufacturkes pr65 form this need is not covered by this International Standard. 2 No tes
2、ts for compressive strength have been included since end results are achieved in service by the insulation system including the outer covering. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standar
3、d. At the time of publication, the editions indicated were velid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC
4、and IS0 maintain registers of currently valid International Standards. IS0 7345 : 1987, Thermal insulation - Physical quantities and definitions. IS0 8302 : 1989, Thermal insulation - Determination of steady state area/ thermal resistance and related properties - Guarded hot-plate apparatus. IS0 849
5、7 : - 1, Thermal insulation - Determination of steady state thermal transmission properties of thermal insulation for ckcular pipes. 3 Definitions For the purposes of this International Standard, the definitions given in IS0 7345 and the following definitions apply. 3.1 man-made mineral fibre: Fibre
6、 manufactured from gtass, rock or other minerals, or from readily melted slags. 3.2 maximum service temperature: Temperature at which the thermal insulation installed at the maximum rec- ommended thickness will continue to perform without degradation of necessary properties or creation of hazards. 3
7、.3 pipe section: Complete cylinder of preformed pipe in- sulation comprising one or more pieces. 4 Composition and form 4.1 The preformed pipe sections shall be made from man- made mineral fibre manufactured by processing glass, rock or slag from a molten state into a fibrous form and bonded with a
8、suitable binder. 4.2 The bonded fibre shall be formed by the manufacturer into annular sections to fit standard sizes of pipe. 4.3 Each section shall be supplied in a single piece or not more than four pieces. NOTE - The preformed pipe insulation may be provided either with or without a factory-appl
9、ied finish, but these finishes are not described in this International Standard. 5 Requirements 5.1 Dimensions 5.1.1 The manufacturer shall declare the nominal length and wall thickness of the product. He shall also declare the nom- nal external diameter of the pipe for which the section is designat
10、ed. NOTE - In some countries it is the practice to designate pipe size by quoting nominal internal diameter instead of external diameter. This is permissible as long as it is made explicit and means of relating internal to external diameter are available. 11 To be published. Copyright International
11、Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:56:16 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8142 : 1990 (E) 5.1.2 These dimensions shall be measured by the met
12、hod given in annex B and shall be subject to the. following tolerances : a) average length: f 5 mm on declared nominal length; b) squareness: The deviation of the ends from 9o” shall not exceed 2 % of out- side diameter or 4 mm, which- ever is the greater; c) average wail thickness: f 3 mm or f 6 %
13、of declared nominal wall thickness, which- ever is the greater; uniformity of wall thickness: The local thickness at any point shall not differ from the mean thickness by more than 3 mm; d) average inside diameter: +4 +2 -1 t-f-m or -I %, whichever is the greater on declared nominal internal diamete
14、r. NOTE - Where it is intended to nest layers of pipe sections, different tolerances may be needed; the manufacturers recommendations should be sought. 5.2 Density The manufacturer shall declare the density of the product. The declared value shall be subject to a tolerance of the acceptance criteria
15、 are specified in 5.3.1 to 5.3.4. These also specify the test pro- cedures to be used for representative product tests and for tests in the conformity control system. 5.3.1 Thermal conductivity The manufacturer shall declare values of thermal conductivity at a minimum of three mean temperatures cove
16、ring the useful service temperature range of the product. These values shall be quoted in the form of a graph or table. To demonstrate compliance in each representative product test, three specimens shall be tested in accordance with IS0 8497 with the specimens mounted tightly on the pipe. The measu
17、red average value of the thermal conductivity at each mean temperature shall not exceed the manufacturers declared value for that mean temperature. Individual values shall not exceed the manufacturers declared value by more than 15 %. The density of the samples tested shall be included in the test r
18、eport. NOTES 1 The guarded hot-plate method of IS0 8302 may be used when the sections supplied have an internal diameter exceeding 500 mm. Flat slabs shall be prepared having the same thickness and density as the sections. If the guarded hot-plate method is used, the fact should be stated clearly in
19、 the test report. 2 The thermal conductivity of pipe insulation may be affected by the diameter, thickness and density of the sections tested. 5.3.2 Maximum service temperature The manufacturer shall declare the maximum service temperature of the product and the maximum thickness that may be used at
20、 this temperature. To demonstrate compliance in each representative product test, when tested in accordance with annex A at the maximum service temperature recommended by the manufacturer and at the maximum thickness recommended for that temperature, each specimen shall satisfy the criteria of claus
21、e A.5. 5.3.3 Fire behaviour It is recommended that fire properties be assessed according to the regulations and codes pertaining to the locality in which the product is to be used. NOTE - The basic mineral fibres used in moulded preformed pipe sections are inherently non-combustible. Although the or
22、ganic binder normally used is a combustible component, it is present only as a small percentage by weight. 5.3.4 Corrosive attack The product shall not include significant quantities of substances which will promote corrosive attack on the surfaces with which it is to be in contact, particularly ste
23、el, copper and aluminium. NOTE - Water-soluble chlorides and other halides are normally present in trace quantities in most commercial thermal insulating 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 N
24、ot for Resale, 04/21/2007 08:56:16 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8142 : 1990 1E) materiats. In the presence of moisture and oxygen and in certain ser- vice conditions, chloride ions are cap-able of initiating stress-corrosion cracking in susceptible me
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