1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 6005 : 1997 ICS 23.140
2、 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Moulded transparent polycarbonate bowls used in compressed air filters and lubricatorsBS 6005 : 1997 This British Standard, having been prepared under the direction of the Engineering Sector Board, was publishe
3、d under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 1997 First edition December 1980 Second edition February 1993 Third edition January 1997 The following BSI references relate to the work on this standard: Committee reference MCE/18/5 Draft for comment 96/70348
4、2 DC ISBN 0 580 26282 0 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee MCE/18, Fluid power systems and components, to Subcommittee MCE/18/5, Control Compone
5、nts, upon which the following bodies were represented: Association of British Mining Equipment Companies British Compressed Air Society British Fluid Power Association British Hydrodynamics Research Association Department of Trade and Industry (National Engineering Laboratory) Ministry of Defence Un
6、iversity of BathBS 6005 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover Foreword ii Specification 1 Scope 1 2 References 1 3 Manufacture 1 4 Visual inspection 1 5 Destructive testing 2 6 Warning notice 2 Annex A (informative) Guidance for the proper use of moulded polycarbo
7、nate bowls 4 Table 1 Contamination limits 1 Figure 1 Typical warning notice 3 List of references Inside back coverii BSI 1997 BS 6005 : 1997 Foreword This British Standard has been prepared by Subcommittee MCE/18/5 and is based upon proposals prepared by the British Compressed Air Society. It supers
8、edes BS 6005 : 1993 which is withdrawn. This standard is intended to assist manufacturers, suppliers and purchasers of moulded polycarbonate bowls to carry out their responsibilities under section 6 of the Health and Safety at Work etc. Act 1974 1, particularly sections 6 (1) (b) and 6 (6) concernin
9、g the need to carry out such testing and examination as may be necessary to ensure, so far as is reasonably practicable, that an article is safe when properly used (see annex A). Although the requirements of this specification reflect the best scientific knowledge available at the time of preparatio
10、n, compliance with it will not necessarily guarantee that failure under pressure will never occur; the likelihood of a failure should, however, be much reduced. Nothing in this standard, nor the use of it, will relieve any person of any statutory obligation or liability in respect of health and safe
11、ty. Annex A of this standard gives guidance for the proper use etc. of units fitted with moulded polycarbonate bowls. This edition differs from BS 6005 : 1993 principally in that the quality control procedures contained within have been amended to obviate the need for the destruction of excessive te
12、st samples. Compliance with a British Standard does not of itself confer immunity from legal obligations. BSI 1997 1 BS 6005 : 1997 1) 1 bar = 10 5 Pa = 10 5 N/m 2 . Specification 1 Scope This British Standard specifies minimum requirements for the manufacture, inspection, testing and labelling of p
13、ressure-containing compressed air filter and lubricator bowls which are moulded in transparent polycarbonate. Components manufactured to this standard are suitable for use generally at pressures of 10 bar 1) or exceptionally at 16 bar. Annex A provides guidance for the proper installation, use and m
14、aintenance of units which are fitted with bowls conforming to this specification. 2 References 2.1 Normative references This British Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and
15、 the cited publications are listed on the inside back cover. For dated references, only the edition cited applies: any subsequent amendments to or revisions of the cited publication apply to this British Standard only when incorporated in the reference by amendment or revision. For undated reference
16、s, the latest edition of the cited publication applies, together with any amendments. 2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the ins
17、ide back cover, but reference should be made to the latest editions. 3 Manufacture 3.1 Moulding material The powder used for moulding the products shall be dried in accordance with the manufacturers recommendations and at the time of moulding shall not contain more than 0.02 % (m/m) water. NOTE. The
18、 TVI (Tomasettis Volatile Indicator) method for the determination of water content is sufficiently accurate for the purpose of this standard. 3.2 Dimensions The dimensions of the moulded product shall conform to those specified in the relevant drawing or specification. 3.3 Tooling If a multi-cavity
19、tooling is used, arrangements shall be made to identify the cavity from which a particular moulding was produced. 3.4 Annealing The finished mouldings shall not be subjected to any annealing process. 4 Visual inspection 4.1 Flaws All mouldings shall be inspected by the unaided eye, and shall not be
20、seen to have cracks, weld lines, splash marks, streaks of foreign matter or voids. 4.2 Stress concentrations For new tooling, 10 % of the initial production batch shall be viewed under polarized light to establish that no adverse stress patterns are present. The colour bands showing internal stress
21、should be uniform and any grouping of stress bands shall not tend to form a straight line, nor shall there be any splash of colour. Mouldings shall then be tested in accordance with 5.2. For established tooling, only the solvent immersion test (see 5.2) is required as the stress concentration test i
22、s covered by this. 4.3 Contamination All mouldings shall be visually inspected for contamination by foreign matter, such as metallic or carbon particles or degraded material. The contamination shall be within the limits specified in table 1. Table 1. Contamination limits Particle size No. of particl
23、es in any 100 cm 2 of component exterior Min. separation between particles mm mm 1.0 None Not applicable # 1.0 and 0.5 a = 16 max. 1) 25 # 0.5 b = 80 max. 1) No requirement 1) Subject to (a + b) = 80 max. 4.4 Surface haze By visual inspection, there shall be no surface haze on any moulding which wou
24、ld noticeably reduce the transparency of the product, except in the region of the mould gate or sprue where it shall not be so dense as to make the product opaque. 4.5 Mechanical damage 4.5.1 Except for minor abrasions caused by the rubbing of the turning mandrel for sprue removal, there shall be no
25、 visible scratching or similar damage to the surfaces of any product. 4.5.2 Surfaces from which the sprue has been removed by machining shall not show signs of heat degradation or lamination.2 BSI 1997 BS 6005 : 1997 2) Also known in the industry as 1-propanol. 5 Destructive testing 5.1 General Duri
26、ng a continuous production run one sample from each cavity shall be taken every 4 h and shall be subjected to the tests specified in 5.2 and 5.3. 5.2 Solvent immersion The mouldings shall not be stress relieved prior to carrying out the solvent immersion. The selected mouldings shall be fully immers
27、ed in a bath containing a mixture of 1 part by volume general purpose reagent grade toluene with 3 parts by volume general purpose reagent grade propan-1-o1 2) for a period of at least 3 min. During this test the mouldings and the solution shall be maintained at a temperature of 22 C 3 C. Immediatel
28、y after removal from the bath, the mouldings shall be visually inspected; there shall be no indication of cracking or crazing of the surfaces over that length of the bowl which would be unsupported in the finished assembly. CAUTION. Attention is drawn to the need to exercise suitable precautions to
29、prevent the build-up of flammable vapours. Occupational exposure limits for toluene and propanol are given in the Health and Safety Executive document EH 40/96 2. 5.3 Pressure test 5.3.1 Method Test mouldings which have been subjected to the test described in 5.2 shall be hydraulically pressure test
30、ed using clean water. Pressurization shall be carried out using a suitable test rig which simulates the normal method of mounting the bowl, with due precautions being taken to evacuate all entrapped air. Pressure shall be applied and slowly increased up to 63 bar and left for a dwell period of not l
31、ess than 60 s. The pressure shall then either be: a) raised in increments of 16 bar, with a dwell of not less than 30 s between each increment until the moulding fails; or b) slowly increased at a constant rate not exceeding 1 bar/s until failure. 5.3.2 Proof pressure The proof pressure at which fai
32、lure of the moulding occurs shall be not less than that specified by the design authority of the product for which the bowl is designed. NOTE. The proof pressure to be specified by the design authority would normally be determined by experiment. 5.3.3 Type of failure The moulding shall have failed b
33、y ballooning and splitting, but it shall not have failed by separation of the flange from the bowl or by any form of shattering or fragmentation. 5.4 Rejection Failure of any sample to satisfy the requirements of 5.2 and 5.3 will necessitate a 10 % random sampling and inspection of all production fo
34、r that period. Any failure from the random sample shall entail rejection of the entire production of the previous 4 h. 6 Warning notice Whenever possible, a warning notice shall be affixed to each moulding that will remain visible after installation. If the notice is attached by means of an adhesive
35、, the adhesive shall be compatible with polycarbonate. The warning notice shall include at least the following: a) the maximum operating temperature, which for polycarbonate is 50 C; b) a warning symbol conforming to BS 5378 : Part 1; c) the word polycarbonate; d) a warning note concerning harmful c
36、hemicals. The warning note shall also show either: 1) the maximum operating pressure (Z bar), which shall not exceed 10 bar, corresponding to the permitted maximum operating temperature of 50 C; or 2) the maximum operating pressure (X bar) corresponding to the maximum operating temperature (Y C) if
37、set below 50 C. X may exceed 10 bar. The notice shall be black, on a yellow background, conforming to BS 5378 : Part 1. NOTE. An example of a typical warning notice is given in figure 1. BSI 1997 3 BS 6005 : 1997 Figure 1. Typical warning noticeBS 6005 : 1997 4 BSI 1997 Annex Annex A (informative) G
38、uidance for the proper use of moulded polycarbonate bowls A.1 General This annex gives guidance on the proper installation, use and maintenance of compressed air filters and lubricators (hereinafter called units) which are fitted with transparent moulded polycarbonate bowls conforming to this Britis
39、h Standard. Although this annex provides guidance for users of these units, the following should be regarded as minimum safety requirements. A.2 Operating conditions A.2.1 Maximum ambient temperature The units should not be installed in locations where the ambient temperature will exceed 50 C. A.2.2
40、 Maximum operating temperature The units should not be installed in systems where the compressed air temperature will exceed 50 C regardless of operating pressure. A.2.3 Operating pressure and temperature The units should not be subjected to pressures or temperatures in excess of those stated in the
41、 warning notice (see 6a and d). A.2.4 Working environment The units should not be exposed to solvents or materials containing solvents, e.g. in any area where an operative is required to wear a respirator or protective clothing. The units should not be exposed to contamination by paint, e.g. when in
42、stalled in, or close to, paint spray booths. A.2.5 Compressor lubricants Unless approved by the unit manufacturer, units should not be used in systems supplied by compressors using diester or similar synthetic lubricants. A.2.6 System lubricants Only those system lubricants which are approved by the
43、 manufacturer of the unit and the pneumatic fluid power equipment or tool should be used. A.3 Installation A.3.1 The units should be located in the pipeline downstream of after-coolers, if provided. A.3.2 If the pneumatic fluid power installation is to be painted, special care should be exercised to
44、 ensure that the moulded polycarbonate bowls are fully masked or similarly protected. A.4 Maintenance of units A.4.1 Inspection A.4.1.1 The moulded polycarbonate bowls should be carefully inspected during each regular preventative maintenance schedule for the units. A.4.1.2 Bowls which on visual ins
45、pection show signs of mechanical damage, cracking, crazing or hazing should be replaced. A.4.1.3 Bowls which have been contaminated with paint should also be replaced; they should not be cleaned. A.4.1.4 All bowls which have been in service for 10 years should be replaced, even though they may appea
46、r acceptable by the visual inspection mentioned in A.4.1.2. A.4.2 Cleaning A.4.2.1 The moulded polycarbonate bowls and any internal plastics components should be cleaned with soap and water only; abrasives should not be used. A.4.2.2 Internal metallic components, e.g. sintered filter elements, shoul
47、d also be cleaned with soap and water, but paraffin may be used as an alternative; cleaning solvents should not be used. A.4.3 Further maintenance Additional maintenance should be carried out in accordance with instructions provided by the unit manufacturer. BSI 1997 BS 6005 : 1997 List of reference
48、s (see clause 2) Normative references BSI publications BRITISH STANDARDS INSTITUTION, London BS 5378 : Safety signs and colours BS 5378 : Part 1 : 1980 Specification for colour and design Informative references 1 GREAT BRITAIN. Health and Safety at Work etc. Act 1974. London: HMSO 2 HEALTH AND SAFET
49、Y EXECUTIVE. EH 40/96 Occupational Exposure Limits 1996. London: HMSOBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It
