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