AS/NZS 2430.3.3:1997

1 - AS/NZS 2430.3.3:1997 CLASSIFICATION OF HAZARDOUS AREAS - EXAMPLES OF AREA CLASSIFICATION-FLAMMABLE LIQUIDS
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 REFERENCED DOCUMENTS
7 - 3 DEFINITIONS
7 - 4 CLASSIFICATION OF HAZARDOUS AREAS
7 - 4.1 Above ground storage tanks, in adequately ventilated locations
7 - 4.1.1 Floating roof tanks and tanks containing floating pans which do not have open vents to atmosphere
8 - 4.1.2 Fixed roof vented tanks
9 - 4.1.3 Sealed tank or cryogenic (refrigerated) tank at nominally atmospheric pressure in adequately ventilated area and...
9 - 4.1.4 Trenches or pits
9 - 4.2 Underground storage tanks
10 - 4.3 Package storage including drum or pail storage
11 - 4.4 Package filling process
11 - 4.5 Pumps for flammable liquid transfer with capacity of 0.7 L/s or more
11 - 4.6 Road or rail tanker loading and discharge in adequately ventilated areas
11 - 4.6.1 General
12 - 4.6.2 Loading
13 - 4.6.3 Road or rail tanker, discharge with or without vapour recovery
13 - 4.6.4 Hoses used for loading and discharge
14 - 4.7 Garages for tanker vehicles
14 - 4.8 Valves and fittings in liquid pipeline, in adequately ventilated locations
15 - 4.9 Pits
15 - 4.10 Waste liquids collection and drainage facilities
17 - 4.11 Underground wiring enclosures
17 - 4.12 Flammable vapour from non-flammable liquids
17 - 4.13 Mechanical ventilation exhaust and inlet ducts associated with an enclosed structure classified as hazardous

Provides guidance on the classification of areas associated with the production, processing, handling, transferring and storage of flammable liquids. It includes specific examples of classification for such areas and also addresses associated equipment other than process equipment, such as pits, waste collection facilities and ventilation air ducts. To be read in conjunction with AS/NZS 2430.3.1:1997.

This Standard provides examples of area classification for areas associated with the production, processing, handling, transferring and storage of flammable liquids. It is part of the AS/NZS 2430.3 series, which recommends the classification of several commonly occurring situations and should be read in conjunction with AS/NZS 2430.3.1. This Standard also addresses flammable vapours from non-flammable liquids (combustible liquids), and associated equipment other than the process equipment such as pits, waste collection facilities and ventilation air ducts.NOTE: Combustible liquids that are stored, handled or processed at a temperature T = FP -6C (where FP = flashpoint of the liquid) should be considered as flammable liquids. Zonal distances for such liquids should be determined in accordance with this Standard unless a detailed classification in accordance with AS 2430.1 indicates otherwise. The classifications given in Clause 4 are not representative examples of the storage and use of flammable liquids for quantities up to-(a) 100 L in closed containers;(b) 25 L for decanting purposes, e.g. petrol transfer to a motor vehicle or lawn mower; (c) 5 L in open containers for occasional use; or (d) 1 L in open container for continuous use.NOTE: Under some circumstances, particularly in confined spaces, caution should be taken with small quantities of flammable liquids as these may give rise to hazardous areas.For surface coatings and adhesives reference should be made to AS/NZS 2430.3.8 and for flammable liquids (and gases) in refineries and major processing plants reference should made to AS/NZS 2430.3.5, which uses the Generalized Method of classification.NOTE: The classifications given in Clause 4 are based on the assumption that the installations are carried out in accordance with the relevant requirements of the authority having jurisdiction. In general, classifications in accordance with the following codes are acceptable, subject to any additional provisions or modifications as required by the authority:(a) Institute of Petroleum Model Code of Safe Practice in the Petroleum Industry.(b) API RP 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities -American Petroleum Institute.(c) BS 5908, Code of practice for fire precautions in the chemical and allied industries.

First published in Australia in part as part of AS 1076.2-1977.
AS 2430.1 first published 1981.
AS 1076.2-1977 and AS 2430.1-1981 revised, amalgamated and designated AS 2430.1-1982.
AS 2430.1-1982 revised and redesignated in part as AS 2430.3-1987.
Second edition 1991.
First published in New Zealand as part of NZS 6101P:1972.
Revised and redesignated in part as NZS 6101.3:1991.
AS 2430.3-1991 and NZS 6101.3:1991 revised, amalgamated and redesignated in part as AS 2430.3.3:1997.