1 Scope
This specification states the design principles and basic requirements for instrumentation selection in petrochemical industry.
This specification is applicable to the design for instrumentation selection in petrochemical industry and for new construction, extension and renovation of factories using coal as raw materials to prepare fuel and chemical products.
This specification is not applicable to analytical instruments used in laboratories, maintenance workshop instrumentation and portable instrumentation.
2 Normative references
The following documents are indispensable for the application of this specification. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 3100-1993 The international system of units and its application
GB 3836.1-2010 Explosive atmospheres — Part 1: Equipment — General requirements
GB 4208-2008 Degrees of protection provided by enclosure (IP code)
GB 17167-2006 General principle for equipping and managing of the measuring instrument of energy in organization of energy using
GB 50160-2008 Fire prevention code of petrochemical enterprise design
GB 50493-2009 Specification for design of combustible gas and toxic gas detection and alarm for petrochemical industry
GBZ 125-2009 Radiological protection requirements for gauges containing sealed radioactive source
TSG R0004-2009 Supervision regulation on safety technology for stationary pressure vessel
GB/T 13283-2008 Accuracy class of measuring instruments and display instruments for industrial process measurement and control
GB/T 18603-2001 Technical requirements of measuring systems for natural gas
GB/T 2624.1-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements
GB/T 2624.2-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 2: Orifice plates
GB/T 2624.3-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 3: Nozzles and Venturi nozzles
GB/T 2624.4-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 4: Venturi tubes
GB/T 4213-2008 Pneumatic control valve
GB/T 13927-2008 Industrial valves—Pressure testing
SH/T 3020-2013 Design specification for instrument air supply system in petrochemical industry
SH/T 3174-2013 Design specification on-line analyzer systems in petrochemical industry
3 Terms and definitions
For the purposes of this specification, the following terms and definitions apply.
3.1
measuring range
interval determined by two values of the measured variable, which is measured with specified accuracy
3.2
span
algebraic difference between the upper and lower limits of a given range
3.3
rangeability
ratio of the maximum span to the minimum span within which an instrument or a device can be calibrated to a specified accuracy class
3.4
accuracy
degree of consistency between the measured value and the true value (actual value), which indicates the measuring error
3.5
accuracy class
class and level of instruments that meet certain measurement requirements and keep the fiducial error or relative error within the specified limit
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3.6
sensitivity
ratio of the change in output to the change in input when the instrument is in steady state, indicating how sensitive the instrument is to changes in the measured parameters. It can also be described as the degree of amplification of the changes in output of the measured parameter
3.7
resolution
ability of the instrument to discriminate between differences in the measured values. degree to reflect the minimum value of the change in measured parameter that can be detected with certainty by the instrument
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Temperature instruments
5.1 Temperature measurement unit and span
5.2 Local temperature instruments
5.3 Remote measurement temperature instruments
6 Pressure instruments
6.1 Pressure measurement unit and span
6.2 Local pressure instruments
6.3 Remote measurement pressure instruments
7 Flow instruments
7.1 Flow measurement unit, span and accuracy
7.2 Differential pressure flowmeter
7.3 Rotameters
7.4 Velocity-type flowmeters
7.5 Positive displacement flowmeters
7.6 Mass flowmeters
7.7 Solid flowmeters and flow switches
8 Level instruments
8.1 Local level instruments
8.2 Remote measurement level instruments
8.3 Level switches
9 Process analyzers
9.1 General specification for process analyzers
9.2 Gas analyzers
9.3 Gas analyzer
10 Control valve
10.1 Control valve
10.2 Self-regulating control valves
10.3 On-off valves
11 Special measurement instruments
11.1 Weigh instruments
11.2 Mechanical shaft vibration measurement instruments
Annex A (Informative) Selection reference for flow instruments
Annex B (Informative) Selection reference for level instruments
Bibliography
Explanation of wording in this specification
