FOREWORD
INTRODUCTION
Clause
1 Scope
2 Normative references
3 Terms and definitions
4 Protection types
5 Constructional requirements for pressurized enclosures
   5.1 Enclosure
   5.2 Materials
   5.3 Doors and covers
   5.4 Mechanical strength
   5.5 Apertures, partitions, compartments and internal
        components
   5.6 Insulating materials
   5.7 Sealing
   5.8 Spark and particle barriers
6 Temperature limits
   6.1 General
   6.2 For type px or type py
   6.3 For type pz
7 Safety provisions and safety devices (except for
   static pressurization)
8 Safety provisions and safety devices for static
   pressurization
9 Supply of protective gas
   9.1 Type of gas
   9.2 Temperature
10 Pressurized apparatus with an internal source of
   release
11 Release conditions
   11.1 No release
   11.2 Limited release of a gas or vapour
   11.3 Limited release of a liquid
12 Design requirements for the containment system
   12.1 General design requirements
   12.2 Infallible containment system
   12.3 Containment system with a limited release
13 Protective gas and pressurizing techniques
   13.1 General
   13.2 Pressurization with leakage compensation
   13.3 Pressurization with dilution
14 Ignition-capable apparatus
15 Internal hot surfaces
16 Type verification and tests
   16.1 Maximum overpressure test
   16.2 Leakage test
   16.3 Purging test for pressurized enclosures with no
        internal source of release (pressurization
        technique may be leakage compensation or
        continuous flow) and filling procedure test for
        static pressurization
   16.4 Purging and dilution tests for a pressurized
        enclosure with an internal source of release
   16.5 Verification of minimum overpressure
   16.6 Tests for an infallible containment system
   16.7 Overpressure test for a containment system with
        a limited release
   16.8 Verifying ability of the pressurized enclosure
        to limit internal pressure
17 Routine tests
   17.1 Functional test
   17.2 Leakage test
   17.3 Tests for an infallible containment system
   17.4 Test for a containment system with a limited
        release
18 Marking
Annex A (normative) Purging and dilution tests
Annex B (informative) Examples of functional sequence
        diagram
Annex C (informative) Examples of the changes in pressure
        in ducts and enclosures
Annex D (informative) Information to be provided to the
        user
Annex E (normative) Classification of the type of release
        within enclosures
Annex F (informative) Examples for the use of the dilution
        area concept
Annex G (normative) Infallibility test for containment
        system
Bibliography
Figures and Tables