ISO INTERNATIONAL STANDARD 11933-4 First edition 2001-05-15 Components for containment enclosures - Part 4: Ventilation and gas-cleaning systems such as filters, traps, safety and regulation valves, control and protection devices Composants pour enceintes de confinement- Partie 4: Systemes de ventilation et d'epuration tels que filtres, pieges, vannes de régulation et de sécurite, organes de controle et de protection Reference number E ISO 11933-4:2001(E) ISO @ ISO 2001 HS unde Not for Resale ISO 11933-4:2001(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The IsO Central Secretariat accepts no liability in this area. Adobe is a trademarkof Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event @ISO2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland @ISO2001-All rightsreserved py IHS unde ermittedwithoutlicense from IHS Not for Resale ISO 11933-4:2001(E) Contents Page Foreword. Introduction. 1 Scope 2 Normativereferences... 3 Terms, definitions and symbols... 4 Functions of ventilation and gas-cleaning systems 4.1 Purpose.... 4.2 Containment. 4.3 Gas cleaning and dilution .... 4.4 Filtration and trapping... 4.5 System limitations .... 5 Safety and protection principles and requirements.... 5.1 General.... .6 5.2 Safety ....... 5.3 Protection of material and handled products ..... 5.4 Fire protection..... 6 Basic data relevant to ventilation and gas cleaning .. 6.1 6.2 Enclosure network... 6.3 General extraction network . 7 Design.. 7.1 Types of enclosure network 9 7.2 Permanency during filter exchange..... 7.3 Location of extraction filters on shielded enclosures 18 7.4 Reservation for flow rate measurement..... 19 7.5 Dimensioning of purification stations ... 19 8 Dimensioning of ventilation and gas-cleaning systems... 19 8.1 8.2 Filters. 19 8.3 Activated carbon (iodine) traps.... 20 8.4 Linking (connection) devices .... 8.5 Control devices.. 22 8.6 Fans... 22 9 Regulation devices .22 9.1 22 9.2 Actuating fiuids.... 9.3 Positioning.. .23 9.4 Regulation devices Examples.. 23 10 Safety-flow-rate systems ... .33 10.1 .33 10.2 Safety valves - Examples. 33 11 Protection devices.... 41 11.1 General... 41 11.2 42 11.3 Hydraulic valves Examples.. 42 11.4 Mechanical valves ... .45 Copyrgh IntemaonalOrganiation for standardizaion served ili Not for Resale ISO 11933-4:2001(E) 12 Air-cleaning systems. 12.1 Filters. .45 12.2 Trapping devices .56 12.3 Filter housings ... .59 13 Pressure measurement devices (manometers, pressure controllers). .64 13.1 13.2 Manometers .65 13.3 Pressure controller. 67 14 Operation, control and maintenance of ventilation and air-cleaning systems .67 14.1 Checking ventilation flow rates... .67 14.2 Checking protection valve liquid levels . 14.3 Gas-cleaning-device maintenance (checking filter clogging). 68 14.4 Filter replacement... .69 AnnexA(normative)Containmentenclosures AnnexB(informative)Ventilationfilterstandardization. 76 Bibliography .80 ISO 2001 - All rights reserved py IHS under ns