QUALITY STANDARD FOR INSTRUMENT AIR

Available format(s)

Hardcopy

Language(s)

English

Published date

01-01-1996

Publisher

International Society of Automation

1 Scope
2 Purpose
3 Definitions
4 Instrument air system design
5 Instrument air, quality standard
  5.1 Pressure dew point
  5.2 Particle size
  5.3 Lubricant content
  5.4 Contaminants
Annexes
A - References
B - Equipment and application guidelines for producing
    instrument air
    B.1 - Instrument air system design
    B.2 - Air quality considerations
    B.3 - Instrument air supply pressure and pneumatic
          pressure transmission signal
C - Guideline for testing pneumatic systems
    C.1 - Application
    C.2 - Inspections and testing
    C.3 - Tests

Provides limits for moisture content and for entrained particle size and oil content in instrument quality air. Establishes an awareness of sources of toxic or corrosive contamination coming into the system through the compressor suction, plant air system cross connection or instrument air connections connected to processes. Also identifies standard air supply pressures (with limit values) and operating ranges for pneumatic devices, gives the ranges of pneumatic transmission signals used in measurement and control systems between elements of systems. Includes, but is not restricted to, pneumatic controllers and control loops, pneumatic transmitters and information transmission systems, and current-to-pressure transducers. Also establishes criteria for testing compliance with instrument-quality air standards.

Committee	SP7
DevelopmentNote	Formerly it was ISA-S7.0.01 (05/2001)
DocumentType	Standard
Pages	34
PublisherName	International Society of Automation
Status	Current
Supersedes	ISA RP7.1 : 1956 ISA S7.4 : 1981 ISA S7.3 : 75(R1981) ISA RP7.7 : 1984

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ANS 59.3 : 1992(R2002)	NUCLEAR SAFETY CRITERIA FOR CONTROL AIR SYSTEMS
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IEEE 268-1992	American National Standard for Metric Practice
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ANSI B93.45M : 82(R1988)	PNEUMATIC FLUID POWER - COMPRESSED AIR DRYERS - METHODS FOR RATING AND TEST

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ISA 7.0.01 : 1996

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