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ISA RP12.4 : 1996

Withdrawn

Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

View Superseded by

PRESSURIZED ENCLOSURES

Withdrawn date

06-12-2024

Superseded by

ISA 12.04.04 : 2012

Published date

01-01-1996

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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
PublisherName
International Society of Automation
Status
Withdrawn
SupersededBy
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)

UL 50:13ED 2015-10-16 Enclosures for Electrical Equipment, Non-Environmental Considerations
ISA S82.01 : 1994 ELECTRICAL AND ELECTRONIC TEST, MEASURING, CONTROLLING AND RELATED EQUIPMENT - GENERAL REQUIREMENTS
NEMA 250 : 2014 ENCLOSURES FOR ELECTRICAL EQUIPMENT (1000 VOLTS MAXIMUM)
ISA S12.1 : 1991 DEFINITIONS AND INFORMATION PERTAINING TO ELECTRICAL INSTRUMENTS IN HAZARDOUS (CLASSIFIED) LOCATIONS
ASME B36.10 : 1979 WELDED AND SEAMLESS WROUGHT STEEL PIPE
NFPA 496 : 2017 PURGED AND PRESSURIZED ENCLOSURES FOR ELECTRICAL EQUIPMENT
IEC 60529:1989+AMD1:1999+AMD2:2013 CSV Degrees of protection provided by enclosures (IP Code)
NFPA 325M : 1991 FIRE HAZARD PROPERTIES OF FLAMMABLE LIQUIDS, GASES, AND VOLATILE SOLIDS
CSA C22.2.0.6 : M82 FLAMMABILITY TESTING OF POLYMERIC MATERIALS (rp: 09/83, 01/85, 05/89)

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