EN ISO 21049:2004

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
      7.1.1 Seal sleeves
      7.1.2 Seal chamber and gland plate
  7.2 Arrangement 2
      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
            innerd seal with a dry-running containment
            seal (2NC-CS)
   7.3 Arrangement 3
       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

ISO 21049:2004 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). ISO 21049:2004 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 ISO 21049:2004 into categories, types, arrangements and orientations is provided.