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UNI EN ISO 21049 : 2005
Current
The latest, up-to-date edition.
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PUMPS - SHAFT SEALING SYSTEMS FOR CENTRIFUGAL AND ROTARY PUMPS
01-06-2005
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Sealing systems
4.1 Seal categories, types and arrangements
4.1.1 General
4.1.2 Seal categories
4.1.3 Seal types
4.1.4 Seal arrangements
4.1.5 Seal orientations
4.2 Objectives
4.3 Specifying and/or purchasing a sealing system
5 General
5.1 Unit responsibility
5.2 Dimensions
6 Design requirements
6.1 Common design requirements (all categories)
6.1.1 General information
6.1.2 Seal chamber and gland plate
6.1.3 Cartridge seal sleeves
6.1.4 Mating rings
6.1.5 Flexible elements
6.1.6 Materials
6.2 Design requirements (category-specific)
6.2.1 Category 1 seals
6.2.2 Category 2 seals
6.2.3 Category 3 seals
7 Specific seal configurations
7.1 Arrangement 1 seals
7.1.1 Seal sleeves
7.1.2 Seal chamber and gland plate
7.2 Arrangement 2 seals
7.2.1 General
7.2.2 Seal sleeves
7.2.3 Seal chamber and gland plates
7.2.4 Contacting wet seals with a liquid buffer
fluid (2CW-CW)
7.2.5 Seal chamber and gland plates for contacting wet
inner seal with a dry-running containment
seal (2CW-CS)
7.2.6 Seal chamber and gland plates for non-contacting
inner seal with a dry-running containment
seal (2NC-CS)
7.3 Arrangement 3 seals
7.3.1 General
7.3.2 Seal sleeves
7.3.3 Seal chamber and gland plates
7.3.4 Contacting wet seal configurations with a
liquid barrier fluid (3CW-FB, 3CW-FF, 3CW-BB)
7.3.5 Standard seal types and arrangements for
non-contacting seal configurations with
a gas barrier fluid (3NC-FB, 3NC-FF, 3NC-BB)
8 Accessories
8.1 Auxiliary piping systems
8.2 Mechanical seal flush/cooling systems (Group I)
8.3 Quench systems (Group II)
8.4 Cooling-water systems (Group III)
8.5 Accessories and auxiliary system components
8.5.1 Cyclone separator
8.5.2 Flow control orifice
8.5.3 Seal flush coolers
8.5.4 Barrier/buffer fluid reservoirs
8.5.5 Barrier/buffer-fluid selection criteria
8.6 Barrier/buffer fluid and seal flush positive-circulating
devices
8.6.1 General
8.6.2 Internal circulating device
8.6.3 External circulating pump
8.6.4 External seal flush systems
8.6.5 Condensate collection reservoir
8.6.6 Barrier/buffer-gas supply systems
9 Instrumentation
9.1 General
9.2 Temperature-indicating gauges
9.3 Thermowells
9.4 Pressure gauges
9.5 Switches
9.5.1 Alarm, trip and control switches
9.5.2 Pressure switches
9.5.3 Level switches
9.5.4 Flow switches
9.6 Level indicators
9.7 Flow instruments
9.7.1 Flow indicators
9.7.2 Flow meters
9.7.3 Flow transmitters
9.8 Relief valves
9.9 Regulators
9.10 Pressure amplifiers
10 Inspection, testing and preparation for shipment
10.1 General
10.2 Inspection
10.3 Testing
10.3.1 Seal qualification testing
10.3.2 Hydrostatic test for pressure-containing
mechanical seal parts and accessories
10.3.3 Test of job seal by seal manufacturer
10.3.4 Air test
10.3.5 Test of job seal by pump manufacturer
10.4 Preparation for shipment
11 Data transfer
11.1 General
11.2 Proposal data
11.3 Contract data
Annex A (informative) Recommended seal selection procedure
Annex B (informative) Typical materials standards for seal
chamber and mechanical seal components
Annex C (normative) Mechanical seal data sheets
Annex D (informative) Mechanical seal codes
Annex E (normative) Seal and pump vendor interface
responsibilities
Annex F (informative) Heat generation and heat soak calculations
Annex G (normative) Standard flush plans and auxiliary hardware
Annex H (informative) Inspector checklist for all seals
Annex I (normative) Form for mechanical seal qualification test
Annex J (normative) Mechanical seals data requirements form
Bibliography
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