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ISA RP12.4 : 1996

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

PRESSURIZED ENCLOSURES

Available format(s)

Hardcopy

Superseded date

23-07-2013

Language(s)

English

Published date

01-01-1996

1 Scope
2 Purpose
3 Definitions
4 General requirements
5 Enclosure requirements
6 Components that protrude through the enclosure
7 Protecting hot surfaces and ignition-capable
    components
8 Protecting against enclosure rupture
9 Purging requirements
10 Tests
    10.1 Verifying ability of enclosure to limit internal
          pressure
    10.2 Maximum operating pressure test
    10.3 Purging test
11 Marking
12 Enclosure access for maintenance
Annexes
A - (normative) References
B - (informative) Comments on the text
C - (informative) Information for sizing pipes and ducts
Tables
1 - Clauses relevant to enclosure openings
2 - Impact levels for enclosure parts
C.1 - Pipe size as a function of flow and distance with a
      nominal 35 psi pressure source
C.2 - Pipe size as a function of flow and distance with a
      nominal 65 psi pressure source
C.3 - Duct size (diameter in inches) as a function of flow
      and distance with 6 in. H2O pressure source

Deals with equipment made suitable for using in hazardous (classified) locations by use of a pressurizing system. Covers equipment with and without an internal release of a flammable gas or vapor.

Committee
SP12
DevelopmentNote
Supersedes ISA S12.4. (06/2002)
DocumentType
Standard
Pages
27
PublisherName
International Society of Automation
Status
Superseded
Supersedes

NFPA 496 : 2017 PURGED AND PRESSURIZED ENCLOSURES FOR ELECTRICAL EQUIPMENT
BS EN ISO 10439:2002 Petroleum, chemical and gas service industries. Centrifugal compressors
I.S. EN ISO 10439:2002 PETROLEUM, CHEMICAL AND GAS SERVICE INDUSTRIES - CENTRIFUGAL COMPRESSORS
ISA 12.00.01 : 2002 ELECTRICAL APPARATUS FOR USE IN CLASS 1, ZONE 0, 1 AND 2 HAZARDOUS (CLASSIFIED) LOCATIONS - GENERAL REQUIREMENTS
CSA C22.4 No. 1 : 2009(R2018) OBJECTIVE-BASED INDUSTRIAL ELECTRICAL CODE
API 551 : 2016 PROCESS MEASUREMENT
CSA C22.4 PACKAGE : 2009 CONSISTS OF C22.4 NO. 1-09, OBJECTIVE-BASED INDUSTRIAL ELECTRICAL CODE AND C22.4 NO. 2-09, OBJECTIVE-BASED INDUSTRIAL ELECTRICAL CODE - SAFETY MANAGEMENT SYSTEM REQUIREMENTS
ISO 10439:2002 Petroleum, chemical and gas service industries Centrifugal compressors
EN ISO 10439:2002 Petroleum, chemical and gas service industries - Centrifugal compressors (ISO 10439:2002)

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