ISA RP12.4 : 1996
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
View Superseded by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
06-12-2024
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
|
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Withdrawn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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