1、BRITISH STANDARD BS 3958-4: 1982 Specification for Thermal insulation materials Part 4: Bonded preformed man-made mineral fibre pipe sections UDC 662.998:677.522-462BS3958-4:1982 This British Standard, having been prepared under the direction of the Refrigeration, Heating and Air Conditioning Standa
2、rds Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1982 BSI 07-1999 First published March 1968 First revision November 1982 The following BSI references relate to the work on this standard: Committee reference RHE/9 Draft for comment 80/74589 IS
3、BN 0 580 12852 0 Cooperating organizations The Refrigeration, Heating and Air Conditioning Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: The organizations marked with an asterisk in the above list, together with the fol
4、lowing, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association of Manufacturers of Domestic Electricity Supply Industry in England and Electrical Appliances Wales* Association of Consulting Engineers Heating and Ventilating Contracto
5、rs Boiler and Radiator Manufacturers Association Association Limited Hevac Association British Combustion Equipment Institute of Energy Manufacturers Association Institute of Refrigeration* British Gas Corporation* Institution of Gas Engineers* British Refrigeration and Air Conditioning Lloyds Regis
6、ter of Shipping Association* Manufacturers Association of Radiators and Building Services Research and Information Convectors Ltd. Association Ministry of Defence Chartered Institution of Building Services* National Coal Board Department of Energy Technology Society of British Gas Industries Departm
7、ent of Health and Social Security* Water-tube Boilermakers Association* Department of the Environment (PSA) Albury Laboratories Limited Eps Association Asbestos Cement Manufacturers Association Eurisol (UK) Association of Manufacturers of Limited Mineral Fibre Insulation British Ceramic Research Ass
8、ociation Fibre Building Board Development British Rubber Manufacturers Association Organization Ltd. Combustion Engineering Association Gypsum Products Development Association Cranfield Institute of Technology Institution of Mechanical Engineers Department of Industry (National Physical Process Plan
9、t Association Laboratory) Royal Institute of British Architects Department of the Environment (Building Structural Insulation Association Research Establishment) Thermal Insulation Manufacturers and Department of the Environment (Housing Suppliers Association (TIMSA) and Construction) Thermal Insula
10、tions Contractors Association Energy Industries Council Yarsley Testing Laboratories Ltd. Engineering Equipment Users Association Coopted member Amendments issued since publication Amd. No. Date of issue CommentsBS3958-4:1982 BSI 07-1999 i Contents Page Cooperating organizations Inside front cover F
11、oreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Sampling and testing 1 5 Composition 1 6 Moisture content 1 7 Physical requirements 1 8 Fire hazard (assessment of self-heating hazard) 1 9 Chemical requirements 2 10 Standard shapes and sizes 2 11 Dimensional tolerances 2 12 External finish 2 13
12、 Marking 2 Appendix A Information to be supplied when ordering 4 Appendix B Method of test for alkalinity 4 Table 1 Thermal conductivity values 1 Table 2 Finishes and overlaps 3 Publications referred to Inside back coverBS3958-4:1982 ii BSI 07-1999 Foreword This revision of this Part of this British
13、 Standard is one of a series published under the direction of the Refrigeration, Heating and Air Conditioning Standards Committee to specify requirements for a particular range of insulating materials. It supersedes the 1968 edition which is now withdrawn. Mineral fibre insulation is not normally de
14、signed or recommended for the support of loads, therefore no test for compressive strength is included in this Part. Other Parts of this standard are: Part 1: Magnesia preformed insulation; Part 2: Calcium silicate preformed insulation; Part 3: Metal mesh faced mineral wool mats and mattresses; Part
15、 5: Bonded mineral wool slabs (for use at temperatures above 50 C); Part 6: Finishing materials; hard setting composition, self-setting cement and gypsum plaster. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for
16、 their 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, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated
17、 (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS3958-4:1982 BSI 07-1999 1 1 Scope This Part of this British Standard specifies composition, moisture content, physical and chemical requirements for bonded prefor
18、med man-made mineral fibre pipe sections, generally for use at elevated temperatures. Ceramic fibres are excluded. Information to be supplied when ordering is given in Appendix A. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Definiti
19、ons For the purposes of this Part of this British Standard, the definitions given in BS874, BS2972, BS3533 and BS5422 apply. 4 Sampling and testing Sampling and testing shall be in accordance with the appropriate clause in BS2972. For thermal conductivity determinations and for the assessment of fir
20、e hazard, a flat slab representative of the pipe section shall be used for the tests. 5 Composition The material shall be of man-made mineral fibre made from rock, slag or glass, processed from a molten state into a fibrous form, and shall be bonded with a suitable binder. 6 Moisture content When co
21、nditioned at high humidity in accordance with 40.4 of BS2972:1975, the moisture content of the material shall not exceed 5 % by mass. 7 Physical requirements 7.1 Thermal conductivity. When tested in accordance with the appropriate method of test for thermal conductivity given in BS 874, the thermal
22、conductivity shall not exceed the values given inTable 1. Table 1 Thermal conductivity values NOTE 1BS 874 requires the test report to state which method of test was employed, the bulk density of the material, the hot face temperature and cold face temperature (generally within the range 10 C to 50
23、C), the conditioning procedure and the moisture content before and after the test. NOTE 2In order to comply with the requirements of Table 1, products of different bulk density may be supplied for use at different service temperatures. The required service temperature should be stated by the purchas
24、er. 7.2 Bulk density. For any particular product, the variation from the manufacturers declared value for bulk density, calculated at the nominal thickness, shall not exceed 15 %. NOTEThe bulk density of the material will normally lie within the range 50 kg/m 3to 200 kg/m 3 . The manufacturers decla
25、red value for bulk density may vary with the size of section. 7.3 Heat stability. When a sample is heated in accordance with 21.1 of BS 2972:1975 at the stated maximum temperature of use, the material shall maintain its general form and shall not suffer visible deterioration of the fibrous structure
26、. 7.4 Temperature limitations. Not all products can give satisfactory service at high hot face temperatures. The manufacturer shall state the recommended maximum service temperature and limiting thickness. 8 Fire hazard (assessment of self-heating hazard) The material shall comply with the requireme
27、nts of 18.1 to 18.3 of BS2972:1975 and with the requirements of 27.1 of BS 5422:1977, as appropriate. Mean temperature Thermal conductivity C W/(mK) 50 100 150 200 250 300 350 0.043 0.052 0.064 0.078 0.093 0.110 0.129BS3958-4:1982 2 BSI 07-1999 9 Chemical requirements 9.1 Alkalinity. When tested by
28、the method described in Appendix B, the pH value recorded shall be between 6.0 and 10.0. 9.2 Corrosive attack. The material shall not include significant quantities of substances that will promote corrosive attack on the surfaces with which it is to be in contact. Where necessary, trace quantities o
29、f water-soluble chlorides shall be estimated in accordance with section 22 of BS2972:1975. NOTE 1Water-soluble chlorides are normally present in trace quantities in most commercial thermal insulating materials. In the presence of moisture and oxygen and under certain adverse metallurgical conditions
30、 chloride ions are capable of initiating stress corrosion cracking in susceptible metal alloys such as austenitic stainless steels. It is not practicable to indicate a safe upper limit for chloride content since water can leach out soluble chlorides from substantial volumes of insulating materials a
31、nd allow them to be concentrated at the metal-insulation interface, in addition, water from outside sources such as the process itself or wind-driven spray can substantially increase the chloride content of the insulation. In conditions potentially conducive to stress corrosion cracking, appropriate
32、 safeguards should be adopted (see BS5970). NOTE 2Some organic matter may be present either in a fibrous form or as a bonding agent. It is suggested that the composition of the product be checked with the manufacturer for use in process conditions where organics may present a hazard, e.g. processes
33、involving powerful oxidizing agents or thermal insulation on pipework and plant in a flammable atmosphere. 10 Standard shapes and sizes 10.1 Shape. Standard sections shall be cylindrical or semi-cylindrical. Very large diameters may be catered for by multi-segmental sections. 10.2 Sizes. The standar
34、d ranges of sizes shall be as follows. NOTE 1The full range of thicknesses may not be available for a specific pipe diameter; the thinner sections are generally only available for small diameter pipes. NOTE 2Not all suppliers provide the full range of standard sizes. Sections of other dimensions may
35、 be available by arrangement with the manufacturer. 11 Dimensional tolerances Preformed pipe sections shall be in accordance with the nominal dimensions stated by the manufacturer (or supplier, as appropriate), subject to the following tolerances. 12 External finish Sections shall be finished plain
36、(no applied finish) or with one of the finishes given in Table 2. Overlaps shall be as specified in Table 2. NOTEOther finishes may be supplied by arrangement between the purchaser and the manufacturer. 13 Marking Each package containing pipe sections, or the articles themselves, shall be clearly ma
37、rked with the following: a) the manufacturers name, mark or symbol; b) the manufacturers type designation, grade and maximum service temperature limit; c) the nominal dimensions (length, thickness and internal diameter of the section); d) the number of this British Standard, i.e. BS 3958-4 1) . Leng
38、th: 0.5 m to 1.2 m Diameter: to fit standard pipes of external diameter up to 610 mm Thickness: 19 mm to 120 mm. Length: 3 mm Thickness: 3 mm Uniformity: the local thickness at any point shall not differ from the average thickness by more than 3 mm Internal diameter: 0, + 1.5 mm (or + 1 %), whicheve
39、r is the greater). 1) Marking BS3958-4 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the avai
40、lability of third party certification to support such claims should be addressed to the Director, Quality Assurance Division, British Standards Institution, Maylands Avenue, Hemel Hempstead, Herts HP2 4SQ in the case of certification marks administered by BSI or to the appropriate authority for othe
41、r certification marks.BS3958-4:1982 BSI 07-1999 3 Table 2 Finishes and overlaps Finish Typical quality Overlap Longitudinal End Cotton scrim Loomstate, weight 0.028 kg/m 2min., texture warp 650, weft 400 threads/metre, min. 38 mm min. a None Cotton canvas Loomstate, weight 0.1 kg/m 2min., texture wa
42、rp 1850, weft 1500 threads/metre min. 38 mm min. a 25 mm min. Aluminium foil laminate Foil thickness 0.008 mm min., glass fibre reinforced, paper laminated 38 mm min. a None (sealing strip used) Polyisobutylene sheet Thickness 0.8 mm min. 38 mm min. a 25 mm min. a May be reduced to 25 mm for section
43、s up to 200 mm in circumference.BS3958-4:1982 4 BSI 07-1999 Appendix A Information to be supplied when ordering The following information shall be supplied with the order: a) the number of this British Standard, i.e. BS 3958-4; b) the dimensions of the sections required; c) the finish required; d) t
44、he maximum service temperature to which the product will be subjected; e) a note of any adverse condition in the environment of the insulation, e.g. acidic fumes; f) a note of any special requirements concerning fire safety. Appendix B Method of test for alkalinity B.1 Preparation of sample. From th
45、e bulk sample, taken in accordance with BS 2972, cut five pieces, each of approximate mass5g, from separate units where possible. Crush these pieces and mix thoroughly. B.2 Determination of pH. Weigh 2 g of the crushed sample and shake well for 10min with100mL of distilled or deionized water (pH 6.5
46、 to 7.5) at room temperature. Leave to settle for 5 min and measure the pH of the mixture, using a standard pH meter (see BS1647 and BS3145) and decanting the solution if necessary. Repeat the test on a further2g of the sample and report both values.BS3958-4:1982 BSI 07-1999 Publications referred to
47、 BS 874, Methods for determining thermal insulating properties, with definitions of thermal insulating terms. BS 1647, pH scale. BS 2972, Methods of test for inorganic thermal insulating materials. BS 3145, Specification for laboratory pH meters. BS 3533, Glossary of thermal insulation terms. BS 395
48、8, Specification for thermal insulating materials 2) . BS 3958-1, Magnesia preformed insulation. BS 3958-2, Calcium silicate preformed insulation. BS 3958-3, Metal mesh faced mineral wool mats and mattresses. BS 3958-5, Bonded mineral wool slabs (for use at temperatures above 50 C). BS 3958-6, Finis
49、hing materials; hard setting composition, self-setting cement and gypsum plaster. BS 5422, Specification for the use of thermal insulating materials. BS 5970, Code of practice for thermal insulation of pipework and equipment (in the temperature range of 100 C to + 870 C). 2) Referred to in the foreword only.BS 3958-4: 1982 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europ
