M00044891
New product
API Std 682 (R2011) Pumps-Shaft Sealing Systems for Centrifugal and Rotary Pumps, Third Edition (Printed Edition Includes binder) (Includes Errata)
standard by American Petroleum Institute, 09/01/2004
Includes November 2006 Errata.
Standard 682 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 to 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 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.
This edition of API Std 682 is the identical national adoption of ISO 21049, Pumps - Shaft sealing systems for centrifugal and rotary pumps. Product Details
Edition: 3rd Published: 09/01/2004 ANSI: ANSI Approved Number of Pages: 195 File Size: 2 files , 11 MB Same As: ISO 21049:2004 Product Code(s): CX68203, CX68203, CX68203 Note: This product is unavailable in Cuba, Iran, North Korea, Syria
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Copyright © 2004 American Petroleum Institute
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Suggested revisions are invited and should be submitted to API, Standards department, 1220 L Street, NW, Washington, DC 20005, standards@api.org.
This American National Standard is under the jurisdiction of the API Committee on Refinery Equipment, Subcommittee on Mechanical Equipment. This standard is considered identical to the English version of ISO 21049. ISO 21049 was prepared by Technical Committee ISO/TC 115, Pumps, 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 Procession equipment and systems.
Page
API Foreword ii
Foreword vi
Introduction vii
Scope 1
Normative references 1
Terms and definitions 3
Sealing systems 10
Seal categories, types and arrangements 10
General 10
Seal categories 10
Seal types 11
Seal arrangements 11
Seal orientations 12
Objectives 12
Specifying and/or purchasing a sealing system 12
General 19
Unit responsibility 19
Dimensions 20
Design requirements 20
Common design requirements (all categories) 20
General information 20
Seal chamber and gland plate 23
Cartridge seal sleeves 30
Mating rings 32
Flexible elements 34
Materials 34
Design requirements (category-specific) 38
Category 1 seals 38
Category 2 seals 39
Category 3 seals 40
Specific seal configurations 41
Arrangement 1 seals 41
Seal sleeves 41
Seal chamber and gland plate 41
Arrangement 2 seals 41
General 41
Seal sleeves 42
Seal chamber and gland plates 42
Contacting wet seals with a liquid buffer fluid (2CW-CW) 43
Seal chamber and gland plates for contacting wet inner seal with a dry-running
containment seal (2CW-CS) 43
Seal chamber and gland plates for non-contacting inner seal with a dry-running
containment seal (2NC-CS) 44
Arrangement 3 seals 44
General 44
Seal sleeves 45
Seal chamber and gland plates 45
Contacting wet seal configurations with a liquid barrier fluid (3CW-FB, 3CW-FF, 3CW-BB) 45
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
Accessories 46
Auxiliary piping systems 46
Mechanical seal flush/cooling systems (Group I) 49
Quench systems (Group II) 50
Cooling-water systems (Group III) 50
Accessories and auxiliary system components 51
Cyclone separator 51
Flow control orifice 52
Seal flush coolers 53
Barrier/buffer fluid reservoirs 53
Barrier/buffer-fluid selection criteria 57
Barrier/buffer fluid and seal flush positive-circulating devices 57
General 57
Internal circulating device 57
External circulating pump 57
External seal flush systems 57
Condensate collection reservoir 58
Barrier/buffer-gas supply systems 58
Instrumentation 59
General 59
Temperature-indicating gauges 59
Thermowells 59
Pressure gauges 59
Switches 60
Alarm, trip and control switches 60
Pressure switches 60
Level switches 61
Flow switches 61
Level indicators 61
Flow instruments 61
Flow indicators 61
Flow meters 61
Flow transmitters 61
Relief valves 61
Regulators 62
Pressure amplifiers 62
Inspection, testing and preparation for shipment 62
General 62
Inspection 62
Testing 63
Seal qualification testing 64
Hydrostatic test for pressure-containing mechanical seal parts and accessories 77
Test of job seal by seal manufacturer 78
Air test 78
Test of job seal by pump manufacturer 78
Preparation for shipment 79
Data transfer 79
General 79
Proposal data 80
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
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
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.
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).
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.
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)