ISO-21049-2004.pdf

Reference number ISO 21049:2004(E) © ISO 2004 INTERNATIONAL STANDARD ISO 21049 First edition 2004-02-01 Pumps Shaft sealing systems for centrifugal and rotary pumps Pompes Dispositifs d'étanchéité de l'arbre pour pompes centrifuges et rotatives Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 21049:2004(E) PDF disclaimer 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 trademark of 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 that a problem relating to it is found, please inform the Central Secretariat at the address given below. © ISO 2004 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 copyrightiso.org Web www.iso.org Published in Switzerland ii © ISO 2004 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 21049:2004(E) © ISO 2004 All rights reserved iii Contents Page Forewordvi Introduction vii 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 3 4 Sealing systems 10 4.1 Seal categories, types and arrangements10 4.1.1 General. 10 4.1.2 Seal categories 10 4.1.3 Seal types 11 4.1.4 Seal arrangements 11 4.1.5 Seal orientations. 12 4.2 Objectives 12 4.3 Specifying and/or purchasing a sealing system . 12 5 General. 19 5.1 Unit responsibility. 19 5.2 Dimensions 20 6 Design requirements 20 6.1 Common design requirements (all categories) . 20 6.1.1 General information 20 6.1.2 Seal chamber and gland plate . 23 6.1.3 Cartridge seal sleeves 30 6.1.4 Mating rings. 32 6.1.5 Flexible elements 34 6.1.6 Materials. 34 6.2 Design requirements (category-specific). 38 6.2.1 Category 1 seals 38 6.2.2 Category 2 seals 39 6.2.3 Category 3 seals 40 7 Specific seal configurations 41 7.1 Arrangement 1 seals. 41 7.1.1 Seal sleeves. 41 7.1.2 Seal chamber and gland plate . 41 7.2 Arrangement 2 seals. 41 7.2.1 General. 41 7.2.2 Seal sleeves. 42 7.2.3 Seal chamber and gland plates . 42 7.2.4 Contacting wet seals with a liquid buffer fluid (2CW-CW) 43 7.2.5 Seal chamber and gland plates for contacting wet inner seal with a dry-running containment seal (2CW-CS). 43 7.2.6 Seal chamber and gland plates for non-contacting inner seal with a dry-running containment seal (2NC-CS) 44 7.3 Arrangement 3 seals. 44 7.3.1 General. 44 7.3.2 Seal sleeves. 45 7.3.3 Seal chamber and gland plates . 45 7.3.4 Contacting wet seal configurations with a liquid barrier fluid (3CW-FB, 3CW-FF, 3CW-BB) . 45 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 21049:2004(E) iv © ISO 2004 All rights reserved 7.3.5 Standard seal types and arrangements for non-contacting seal configurations with a gas barrier fluid (3NC-FB, 3NC-FF, 3NC-BB) .46 8 Accessories .46 8.1 Auxiliary piping systems46 8.2 Mechanical seal flush/cooling systems (Group I)49 8.3 Quench systems (Group II) 50 8.4 Cooling-water systems (Group III).50 8.5 Accessories and auxiliary system components 51 8.5.1 Cyclone separator.51 8.5.2 Flow control orifice .52 8.5.3 Seal flush coolers53 8.5.4 Barrier/buffer fluid reservoirs 53 8.5.5 Barrier/buffer-fluid selection criteria.57 8.6 Barrier/buffer fluid and seal flush positive-circulating devices .57 8.6.1 General .57 8.6.2 Internal circulating device57 8.6.3 External circulating pump 57 8.6.4 External seal flush systems.57 8.6.5 Condensate collection reservoir58 8.6.6 Barrier/buffer-gas supply systems58 9 Instrumentation .59 9.1 General .59 9.2 Temperature-indicating gauges.59 9.3 Thermowells.59 9.4 Pressure gauges59 9.5 Switches.60 9.5.1 Alarm, trip and control switches60 9.5.2 Pressure switches.60 9.5.3 Level switches.61 9.5.4 Flow switches61 9.6 Level indicators.61 9.7 Flow instruments.61 9.7.1 Flow indicators61 9.7.2 Flow meters61 9.7.3 Flow transmitters.61 9.8 Relief valves.61 9.9 Regulators62 9.10 Pressure amplifiers.62 10 Inspection, testing and preparation for shipment .62 10.1 General .62 10.2 Inspection.62 10.3 Testing63 10.3.1 Seal qualification testing64 10.3.2 Hydrostatic test for pressure-containing mechanical seal parts and accessories77 10.3.3 Test of job seal by seal manufacturer.78 10.3.4 Air test 78 10.3.5 Test of job seal by pump manufacturer78 10.4 Preparation for shipment79 11 Data transfer 79 11.1 General .79 11.2 Proposal data.80 11.3 Contract data .81 Annex A (informative) Recommended seal selection procedure .85 Annex B (informative) Typical materials standards for seal chamber and mechanical seal components.130 Annex C (normative) Mechanical seal data sheets 137 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 21049:2004(E) © ISO 2004 All rights reserved v Annex D (informative) Mechanical seal codes 146 Annex E (normative) Seal and pump vendor interface responsibilities 148 Annex F (informative) Heat generation and heat soak calculations 150 Annex G (normative) Standard flush plans and auxiliary hardware 157 Annex H (informative) Inspector checklist for all seals. 188 Annex I (normative) Form for mechanical seal qualification test. 189 Annex J (normative) Mechanical seals data requirements form 192 Bibliography . 193 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 21049:2004(E) vi © ISO 2004 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 21049 was prepared by Technical Committee ISO/TC 115, Pumps, Subcommittee SC 3, Installation and special applications, in collaboration with Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, SC 6, Processing equipment and systems. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 21049:2004(E) © ISO 2004 All rights reserved vii Introduction This International Standard is based on the accumulated knowledge and experience of manufacturers and users of equipment in the petroleum, natural gas and chemical industries, but its use is not restricted to these industries. Users of this International Standard should be aware that further or differing requirements may be needed for individual applications. This International Standard is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This may be particularly appropriate where there is innovative or developing technology. Where an alternative is offered, the vendor should identify any variations from this International Standard and provide details. The purpose of this International Standard is to assist purchasers with the selection and operation of mechanical seals for pumps. This International Standard is a stand-alone seal standard and is referenced normatively in ISO 13709. It is applicable to both new and retrofitted pumps, and to pumps other than ISO 13709 pumps (e.g. ASME B73.1, ASME B73.2 and API 676 pumps). In this International Standard, where practical, US Customary units are included in brackets for information. A bullet (?) at the beginning of a clause or subclause indicates that either a decision is required or further information is to be provided by the purchaser. This information should be indicated on data sheets or stated in the enquiry or purchase order (see examples in Annex C). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 21049:2004(E) © ISO 2004 All rights reserved 1 Pumps Shaft sealing systems for centrifugal and rotary pumps 1 Scope This International Standard specifies requirements and gives recommendations for sealing systems for centrifugal and rotary pumps used in the petroleum, natural gas and chemical industries. It is applicable mainly for hazardous, flammable and/or toxic services where a greater degree of reliability is required for the improvement of equipment availability and the reduction of both emissions to the atmosphere and life-cycle sealing costs. It covers seals for pump shaft diameters from 20 mm (0,75 in) to 110 mm (4,3 in). This International Standard is also applicable to seal spare parts and can be referred to for the upgrading of existing equipment. A classification system for the seal configurations covered by this International Standard into categories, types, arrangements and orientations is provided. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 7 (all parts), Pipe threads where pressure-tight joints are made on the threads ISO 261, ISO general-purpose metric screw threads General plan ISO 262, ISO general-purpose metric screw threads Selected sizes for screws, bolts, and nuts ISO 286-2, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts ISO 724, ISO general-purpose metric screw threads Basic dimensions ISO 965 (all parts), ISO general-purpose metric screw threads Tolerances ISO 3069, End-suction centrifugal pumps Dimensions of cavities for mechanical seals and for soft packing ISO 4200, Plain end steel tubes, welded and seamless General tables of dimensions and masses per unit length ISO 7005-1, Metallic flanges Part 1: Steel flanges ISO 10438 (all parts), Petroleum, petrochemical and natural gas industries Lubrication, haft-sealing and control-oil systems and auxiliaries ISO 13709, Centrifugal pumps for petroleum, petrochemical and natural gas industries ISO 15649, Petroleum and natural gas industries Piping IEC 60079 (all parts), Electrical apparatus for explosive gas atmospheres IEC 60529, Degrees of protection provided by enclosures (IP code) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/03/2007 00:53:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 21049:2004(E) 2 © ISO 2004 All rights reserved AISI, Standards, codes and specifications of the American Iron and Steel Institute 1) API RP 520 (all parts), Sizing, selection, and installation of pressure-relieving devices in refineries 2) API Std 526, Flanged steel pressure relief valves ASME V, ASME Boiler and pressure vessel code, Section V, Non-destructive examination 3) ASME VIII, ASME Boiler and pressure vessel code, Section VIII, Rules for the construction of pressure vessels ASME IX, ASME Boiler and pressure vessel code, Section IX, Welding and brazing qualifications ASME B1.1, Unified inch screw threads (UN and UNR thread form) ASME B1.20.1, Pipe threads, general purpose, inch ASME B16.11, Forged fittings, socket-welding and threaded ASME B16.20, Metallic gaskets for pipe flanges