1、BSI Standards PublicationPD CEN/TR 16589:2013Laboratory installations Capture devices witharticulated extract armPD CEN/TR 16589:2013 PUBLISHED DOCUMENTNational forewordThis Published Document is the UK implementation of CEN/TR16589:2013.The UK participation in its preparation was entrusted to Techn
2、icalCommittee LBI/1/1, Laboratory furniture and fittings.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The Brit
3、ish Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 82236 0ICS 71.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 31 Decem
4、ber 2013.Amendments issued since publicationDate Text affectedPD CEN/TR 16589:2013TECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CEN/TR 16589 October 2013 ICS 71.040.10 English Version Laboratory installations - Capture devices with articulated extract arm Installation de laboratoire - Dispo
5、sitif de capture avec bras articul dextraction Laboreinrichtungen - Absaugvorrichtungen mit beweglichem Arm This Technical Report was approved by CEN on 10 September 2013. It has been drawn up by the Technical Committee CEN/TC 332. CEN members are the national standards bodies of Austria, Belgium, B
6、ulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
7、 Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membe
8、rs. Ref. No. CEN/TR 16589:2013: EPD CEN/TR 16589:2013CEN/TR 16589:2013 (E) 2 Contents Page Foreword 3 1 Scope 4 2 General description .4 3 Applications and installation 6 4 Manufacturers or suppliers 7 5 Performance metrics .7 6 Use 8 6.1 Routine use 8 6.2 Maintenance .8 6.3 Training .8 Bibliography
9、 9 PD CEN/TR 16589:2013CEN/TR 16589:2013 (E) 3 Foreword This document (CEN/TR 16589:2013) has been prepared by Technical Committee CEN/TC 332 “Laboratory equipment”, the secretariat of which is held by DIN. Attention is drawn to the possibility that some of the elements of this document may be the s
10、ubject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. PD CEN/TR 16589:2013CEN/TR 16589:2013 (E) 4 1 Scope This Technical Report gives guidance regarding the selection, specification, installation and use of capture devices with artic
11、ulated extract arm (abbreviated: AEAs) in laboratories. The informative material provided includes the general concept of AEAs, the variety of sub-types available, system installation issues, performance metrics and operational factors such as use, maintenance and training. 2 General description Inc
12、reasingly, capture devices with extract arm (known by a variety of names, e.g. “elephant trunks”, “snorkels”, “flexible exhausts” etc.) have been installed in laboratories mainly for the purpose of evacuating contaminants at source. They are used in low-hazard situations such as reduction of heat em
13、itted by lab devices or capture of emissions, e.g. from HPLC equipment or in similar applications. The capture performance of AEAs is largely dependent of the (spatial) relationship between the source of the gas, fume, vapour or dust requiring capture and the inlet hood (capture device) of an AEA. C
14、apture devices with extract arms are for that reason only useful for example for very small pollution sources or when the pollution source is too large to reasonably be enclosed and has distinct points where the pollution might occur like a HPLC. There are today no available universal, readily-appli
15、ed and normalised test methodologies for AEAs, although smoke is useful in visualising flows. For this reason care shall be taken in the selection, installation, and, critically, in-use arrangement of AEAs (as described in Clause 6). Some information can be found in VDI 2262 Part 4 (see Bibliography
16、, 1). AEAs are available in a number of formats, a selection of which is illustrated in the diagrams that follow. Key 1 spherical joints 2 rigid ductwork 3 inlet hood 4 exhaust 5 bench top Figure 1 Rigid ducts with spherical joints exhausting at high level Key 1 joints from flexible ductwork 2 rigid
17、 ductwork 3 inlet hood 4 exhaust 5 bench top Figure 2 Rigid ducts with flexible joints exhausting at high level PD CEN/TR 16589:2013CEN/TR 16589:2013 (E) 5 Key 1 articulated support frame 2 flexible ductwork 3 inlet hood 4 exhaust 5 bench top Figure 3 Flexible ductwork exhausting at high level Key 1
18、 spherical joints 2 rigid ductwork 3 inlet hood 4 exhaust 5 bench top Figure 4 Rigid ducts with spherical joints exhausting at low level Key 1 joints from flexible ductwork 2 rigid ductwork 3 inlet hood 4 exhaust 5 bench top Figure 5 Rigid ducts with flexible joints exhausting at low level Key 1 fle
19、xible ductwork 2 inlet hood 3 exhaust 4 bench top Figure 6 Flexible ductwork exhausting at low level PD CEN/TR 16589:2013CEN/TR 16589:2013 (E) 6 The design shown in Figure 6 can also be used with high level exhaust systems, in which case the flexible duct merely hangs from ceiling level. The example
20、s shown above relate to the most common approaches of mounting from above (high level) or bench-mounting. Further alternatives include sidewall mounting and support from an overhead services wing. Some typical arrangements of AEAs are illustrated below (generally being examples of Types 1 and 4). Ke
21、y 1 over bench-mounted articulated arms 2 bench-mounted articulated arms Figure 7 Different arrangements of articulated extract arms 3 Applications and installation Although the use of capture devices with articulated extract arm (AEAs) has some apparent immediate benefits in comparison with more tr
22、aditional or conventional containment solutions, there are a number of issues that shall be considered and controlled. These include: a) The performance of an AEA is largely dependent on the proximity and location of the inlet opening relative to the source of contaminant and the extract velocity ge
23、nerated at that point. Any proposed installation shall, therefore, be capable of covering a range so that the inlet is appropriately close to the source and this may require the provision of a capture device suitable for its purpose (see Clause 4). To assure a good function over time it is also impo
24、rtant that the capture device is easy to manoeuvre in position and that it stays put in its position over time. b) AEAs are for example employed in situations that involve nuisance activities, such as the removal of odors and other activities with low risk exposure. In each case, however, their appl
25、ication should nevertheless always be subject to a formal risk assessment. c) As an AEA is supposed to be used close to the contaminants source, they should in general not be used for large diffuse sources. d) AEA capture devices are susceptible to disturbing airflows and therefore care needs to be
26、taken when planning their installation. e) The buoyancy of the contaminant that the AEA is intended to capture will also have an impact on the effectiveness of an installation. For example, a capture device should preferably be placed above sources that are releasing contaminants that are less dense
27、 than ambient air and, conversely, below those that are releasing contaminants that are substantially more dense. These considerations can also have PD CEN/TR 16589:2013CEN/TR 16589:2013 (E) 7 substantial effects on the shape and extent of the capture device. Although simple cones are shown in the i
28、llustrations in Clause 2, more complex or tailor made forms are likely to show benefits in a variety of functional situations. Smoke can be useful in visualising this issue. f) The diameter of the ducted components of the arms is typically comparatively small in diameter. This results in relatively
29、high air velocities together with associated considerations of air resistance and noise generation. This situation is further exacerbated in many cases by the incorporation of sections of flexible ductwork into the designs. g) As a consequence of the foregoing point, although the volume flow rates r
30、equired by the AEAs are low, the resistances may represent a significant factor in the design of the overall extract ventilation system. If an AEA is connected into a main, common-user extract system in a position at, or close to, the index leg of the ductwork installation, then a substantial energy
31、 cost will be paid for the use of the AEA. This difficulty can be addressed in a number of ways, including: 1) Select a larger diameter of the extract arm to obtain a lower pressure drop and noise level. 2) Select an AEA with low pressure drop. 3) Do not locate the AEAs on a common-user extract syst
32、em but install a dedicated sub-system. 4) As far as possible, any AEAs installed on a common-user extract system should be connected at locations that do not increase the resistance or modify the location of the index leg (of the overall system when considered without the AEAs). 4 Manufacturers or s
33、uppliers In discussions with manufacturers or suppliers of capture devices with articulated extract arm there are a number of aspects that may be usefully considered by potential users before the design and use of the devices is finalised. These include: a) The intended application should be discuss
34、ed with the supplier to obtain a ventilation solution appropriate for the risk concerned. b) The supplier should be requested to supply, if at all possible, details of equivalent examples of AEA applications installed by other users. c) The manufacturer should be requested to supply engineering inst
35、allation data regarding the AEA. This may include volume flow rates, pressure drops, acoustic information and capture efficiency. d) The materials of manufacture should be reviewed against factors such as resistance to chemical attack, suitability for fumigation, cleanability and robustness against
36、physical damage. e) The provision of some form of airflow indicator could be a worthwhile enhancement to systems (see Clause 6 below). f) For special applications, the potential use of customised (to the particular situation) forms of capture devices may be considered with an objective of improving
37、the efficiency of capture or partial containment. 5 Performance metrics As stated in Clause 3, the performance of an AEA is largely dependent on the proximity and location of the inlet opening relative to the source of contaminant and the capturing velocity generated at that point; besides, the buoy
38、ancy of the contaminant can also be an important factor. The capturing effectiveness at the source will thus also depend upon the characteristics of the release (e.g. release energy and release direction). As mentioned elsewhere in this Technical Report, the use of smoke, ideally used with the proce
39、ss in operation, can be useful to visualise the flows and to demonstrate the effectiveness of capture at different flow rates. PD CEN/TR 16589:2013CEN/TR 16589:2013 (E) 8 6 Use 6.1 Routine use Although an AEA installation may have been appropriately selected and correctly designed and installed, its
40、 effectiveness in use will remain largely dependent on the spatial relationship between the source of contaminant and the entry to the inlet hood. If a device data panel is attached to, for instance, the inlet hood, it could beneficially include the distance source-to-hood (possibly supported by a d
41、iagram) that is necessary for effective performance. 6.2 Maintenance The volume flow rate of an AEA is the most readily-monitored performance criterion. It should be measured on a regular basis as an important component of a maintenance regime. It is also certainly worthwhile considering the provisi
42、on of an easily-read airflow indicator (equivalent, for instance, to those mounted on fume cupboards). The use of smoke, although a subjective approach, can be helpful in visualising the performance of an AEA. 6.3 Training Both the routine use of AEAs and their maintenance should be supported by str
43、uctured and controlled training programmes. Key issues are: a) The use of an AEA should be limited to a defined purpose and should not be applied to other situations without a further risk assessment. b) Training should provide knowledge of the critical source-to-hood physical relationship and shoul
44、d provide a method for its measurement and control. c) Maintenance procedures should be included in a training programme. PD CEN/TR 16589:2013CEN/TR 16589:2013 (E) 9 Bibliography 1 VDI 2262 Part 4, Workplace air Reduction of exposure to air pollutants Capture of air pollutants; available at www.beut
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