HG/T 20507-2014 PDF English
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Design code for instrument selection
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Design code for selection of instrument type
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HG/T 20507-2014: Design code for instrument selection---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT20507-2014
HG
CHEMICAL INDUSTRY STANDARD
File No.. J 1809-2014
Replacing HG/T 20507-2000
Design code for instrument selection
Issued on. MAY 06, 2014
Implemented on. OCTOBER 01, 2014
Issued by. Ministry of Industry and Information Technology of the People��s
Republic of China.
Table of Contents
Foreword... 5
1 General provisions... 7
2 Terms... 8
3 General requirements... 10
4 Temperature instrument... 11
5 Pressure instrument... 16
6 Flow instrument... 19
7 Level instrument... 27
8 Online analytical instrument... 36
9 Display control instrument... 41
10 Instrument panel... 46
11 Control valve... 47
12 Other instrument... 57
Appendix A -- Selection of flow gauge (normative)... 59
Explanation of wording in this standard... 61
Normative standards... 62
CHEMICAL INDUSTRY STANDARD
Design code for instrument selection
Main drafting organizations. China Huanqiu Contracting & Engineering Co., Ltd.,
China Wuhuan Engineering Co., Ltd.
Approval authority. Ministry of Industry and Information Technology of the People��s
Republic of China
Date of implementation. October 1, 2014
1 General provisions
1.0.1 This Code was formulated in order to unify the technical requirements for the
selection of measurement and control instruments in the chemical industry, promote the
standardization of engineering design for the selection of chemical measurement and
control instruments, and achieve the goals of technological advancement, economical
rationality, safety and applicability.
1.0.2 This Code is applicable to the selection and design of measurement and control
instruments in new construction, expansion and renovation projects in the chemical
industry.
1.0.3 In addition to complying with the requirements of this Code, the selection and
design of measurement and control instruments shall also comply with the relevant
current national standards.
2 Terms
2.0.1 Accuracy of measurement
The degree of consistency between the measured result and the (agreed) true value of
the measurand.
2.0.2 Repeatability of measurement
The degree of consistency between the results of multiple consecutive measurements
of the same measurand by the same measurement method and the same observer, using
the same measuring instrument, at the same place, under the same working conditions
and repeated within a short period of time.
2.0.3 Measuring range
The interval determined by the two values of the measurand measured with specified
accuracy. It is also called ��range��.
2.0.4 Proportional action (P-action)
The control action in which the change of output variable is proportional to the change
of input variable.
2.0.5 Integral action (I-action)
The control action in which the change rate of output variable (time derivative) is
integrated with the corresponding input variable value (system deviation in the control
system).
2.0.6 Derivative action (D-action)
The control action in which the value of output variable is derivative with the change
rate (first time derivative) of input variable (system deviation in the controller).
2.0.7 Sensor
A primary element in a measuring chain that converts input variables into signals
suitable for measurement.
2.0.8 Transducer
A device that accepts information formed by physical or chemical variables (input
variables) and converts it into output variables of the same or other properties according
to certain rules.
2.0.9 Transmitter
A measurement transducer that converts the output of the measurand into a standardized
signal. For example. temperature transmitter, pressure transmitter, flow transmitter, etc.
3 General requirements
3.0.1 Measurement and control instruments shall be preferably electronic. Pneumatic
instruments can be used in special situations.
3.0.2 For electronic instruments installed on site, it shall select the corresponding
instrument that meets the hazardous area according to the classification of the hazardous
area. The explosion-proof design shall comply with the current national standard
��Electrical apparatus for explosive gas atmospheres�� GB 3836.The selected
explosion-proof product shall have an explosion-proof certificate.
3.0.3 The protection degree of the instrument shall comply with the relevant provisions
of the current national standard ��Degrees of protection provided by enclosure�� GB 4208.
The protection degree of electronic instruments installed on site should not be lower
than IP 65, and the protection degree of non-electronic instruments installed on site
should not be lower than IP54.
3.0.4 The pressure level of the connection in the process of installing an instrument
(throttle device, flowmeter, regulating valve, etc.) with a pipeline shall meet the
requirements of the pipeline material grade table.
4 Temperature instrument
4.1 General requirements
4.1.1 The unit and measuring range of temperature instruments shall meet the following
requirements.
4.1.2 The immersion depth of temperature detection elements shall meet the following
requirements.
4.1.3 The selection of protective sleeves for temperature detection elements shall meet
the following requirements.
4.2 Local temperature gauge
4.2.1 The selection of the accuracy level of local temperature instruments shall meet
4.2.2 The selection of the measuring range of local temperature instruments shall meet
the following requirements.
4.3 Temperature instrument for centralized detection
4.3.1 The selection of temperature detection elements shall meet the following
requirements.
4.3.2 For position controls and alarms, it can select an electric contact thermometer.
4.3.3 In situations where standard signal transmission is required, it shall use a
temperature transmitter. The selection of temperature transmitters shall meet the
following requirements.
4.3.4 In situations require measuring the temperature of multiple points, it can select a
multi-channel temperature converter, but multi-channel temperature converters must
not be used in situations of temperature calculation, control and safety interlocking.
5 Pressure instrument
5.1 General requirements
5.1.1 The units and measuring range of pressure instruments shall comply with the
following provisions.
5.2 Selection of pressure gauge
5.2.1 The selection of pressure measuring instruments shall meet the following
requirements.
5.2.2 The selection of pressure measuring instruments for special media shall meet the
following requirements.
5.2.6 The selection of the accuracy level of pressure measuring instruments shall meet
the following requirements.
5.2.7 The selection of the external dimension of pressure measuring instruments shall
meet the following requirements.
5.2.8 The selection of the measuring range of pressure measuring instruments shall meet
the following requirements.
5.3 Selection of transmitter
5.3.1 It should select a pressure transmitter for pressure measurement. When measuring
tiny pressures (less than 500 Pa), it should select a differential pressure transmitter.
5.3.2 When measuring the differential pressure of equipment or pipelines, it should
select a differential pressure transmitter.
5.3.3 When measuring the vacuum pressure, it should select an absolute pressure
transmitter.
6 Flow instrument
6.1 General requirements
6.1.1 This Code is used for the selection of flow instruments under the following
conditions.
6.1.2 This Code only covers flow instruments that are currently finalized and proven to
be reliable through practical use, mainly including. throttling devices and differential
pressure meters; variable area flowmeters (rotor flowmeters); velocity flowmeters;
positive displacement flowmeters; electromagnetic flowmeters; ultrasonic flowmeters;
Coriolis mass flowmeters; thermal mass flowmeters.
6.2 Selection of differential pressure flowmeter
6.2.1 It should select standard throttling devices for differential pressure flowmeters.
The selection of standard throttling devices shall comply with the current national
standard ��Measurement of fluid flow by means of pressure differential devices inserted
in circular cross-section conduits running full�� GB/T 2624.
6.2.2 The material of throttling devices shall be at least 304SS.
6.2.3 The selection of standard throttling devices shall meet the following requirements.
6.2.4 It can use non-standard throttling devices under the following circumstances.
6.3 Variable area flowmeter (rotameter)
6.3.1 In fluid measurement situations where the accuracy is not better than level 1.5 and
the measuring range ratio is not greater than 10.1, it should select a rotameter.
6.4 Velocity flowmeter
6.4.1 The selection of vortex flowmeters shall meet the following requirements.
6.4.2 When measuring the flow of large-diameter pipelines, it should select an plug-in
vortex flowmeter.
6.4.3 The length of the straight pipe section of the vortex flowmeter should be 15D ~
50D upstream (depending on the piping conditions); when a rectifier is added upstream,
the length of the straight pipe section shall not be less than 10D, and shall not be less
than 5D downstream.
6.6 Magnetic flowmeter
6.6.1 The magnetic flowmeter should be used for the flow measurement of media with
conductivity greater than 5 ��S/cm.
6.6.2 The magnetic flowmeter should be used for the flow measurement of liquid-solid
two-phase media.
7 Level instrument
7.1 General requirements
7.1.1 The level includes liquid level, interface, solid level, etc.
7.2 Liquid level and interface measuring instrument
7.2.1 The selection of magnetic float liquid level gauge shall meet the following
requirements.
7.2.2 The selection of glass plate liquid level gauges shall meet the following
requirements.
7.2.5 For continuous measurement and positive displacement measurement of liquid
level of clean liquids in large storage tanks, as well as positional measurement of liquid
level and interface of clean liquids in various storage tanks, it can use a float liquid level
gauge (float instruments include servo type, steel belt type, magnetostrictive type,
magnetic float type, lever type). The selection of float liquid level gauges shall meet the
following requirements.
7.3 Solid level measuring instrument
7.3.1 For continuous and positional measurement of solid level of granular and powdery
materials, such as coal, plastic monomers, fertilizers, sand, etc., it should select a
capacitive solid level gauge (switch) or radio frequency admittance solid level gauge
(switch). The selection of capacitive solid level gauges (switches) or radio frequency
admittance solid level gauges (switches) shall meet the following requirements.
7.3.3 For granular and powdery materials with good electrical conductivity, it should
select a resistive solid level gauge. The selection of resistive solid level gauges shall be
determined based on the measurement reliability, sensitivity and specified electrode-to-
ground resistance value of the product.
8 Online analytical instrument
8.1 General requirements
8.1.1 This clause applies to the selection of online analytical instruments in the chemical
production process.
8.1.2 The contents of this clause are not applicable to the selection of portable analytical
instruments and laboratory analytical instruments.
8.2 Requirements for sampling pipe
8.2.1 The location of the sampling port should be a place where the measurement
medium responds quickly and is representative.
8.3 Preconditioning device
8.3.1 The preconditioning device shall include adjustment and control facilities for
sample flow, pressure and temperature. In special cases, it shall also include condensers,
coolers, vaporizers, filters or purifiers based on the working conditions and analyzer
usage requirements, and a chemical or physical treatment device used to ensure the
selectivity of the analytical instrument.
8.3.2 The sample preconditioning unit shall be close to the analytical sampling point,
the sample processing unit shall be close to the analytical instrument, and the
preconditioning device should be provided as a complete set with the analytical
instrument.
8.4 Analytical instrument for liquid service
8.4.1 When measuring media such as distilled water, drinking water, boiler water, pure
water and high-purity water with conductivity in the range of 0.05 ��S��cm ~ 1000 ��S��cm,
it should select an industrial conductivity analyzer.
8.4.2 When the pH of the liquid medium is in the range of 2 ~ 12, it should select a pH
meter.
8.5 Analytical instrument for gas service
8.5.1 When the hydrogen content in the gas is between 0 ~ 100 %, and the thermal
conductivity of the background gas is significantly different from that of hydrogen, or
the composition of the background gas is relatively stable, it should select a thermal
conductivity hydrogen analyzer.
8.5.2 For trace oxygen analysis, it should select an electrochemical or thermochemical
oxygen analyzer.
8.5.3 For constant oxygen analysis, it shall select a magnetic oxygen or zirconia oxygen
analyzer.
8.5.4 For microanalysis of carbon monoxide and carbon dioxide in gases of which the
background gas has no major cross-interference, it should select a thermal conductivity
or infrared absorption analyzer.
8.5.5 For constant carbon monoxide analysis, it should select an infrared absorption
analyzer. If the gas sample contains a lot of dust and moisture, it can select a thermal
conductivity analyzer.
9 Display control instrument
9.1 General requirements
9.1.1 This clause applies to the selection of panel-mounted display control instruments
in chemical automation design.
9.1.2 The selection of display control instruments shall meet the following requirements.
9.1.3 The measurement accuracy of the instrument shall be selected according to the
requirements of the process and the importance of the variables. The indicated
measurement accuracy shall be better than ��1.00 % and the recorded measurement
accuracy shall be better than ��1.50 %.
9.1.4 Commonly used measurement units, instrument scales or measuring range
indication values and their usage ranges should comply with the requirements of Table
9.1.4.
9.2 Selection of display instrument
9.2.1 The selection of local display instruments shall meet the following requirements.
9.2.2 The selection of panel-mounted display instruments shall meet the following
requirements.
9.3 Selection of control instrument
9.3.1 For the control instruments of the production device, other control instruments
such as intelligent instruments with microprocessors, digital display control instruments,
electric unit combined (or assembled) instruments, etc. can be used according to needs.
9.3.2 When used in a production process that is not easy to stabilize or is frequently
started and stopped, for analog control instruments it should select a full-scale
indicating controller rather than a deviation indicating controller; for digital control
instruments it should select a controller with light strip indication.
9.3.3 The control rules in the control system shall be determined based on factors such
as object characteristics, characteristics of control system equipment components
(including detection components, transmitters, control instruments, actuators, etc.),
interference forms and required control quality.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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