1 Scope
This specification specifies the engineering design method and design principle of on-line analyzer system in petrochemical production unit, public works and auxiliary facilities.
This specification is applicable to the engineering design of on-line analyzer system for constructed, extended and renovated projects in petrochemical industry.
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 4208 Degrees of protection provided by enclosure (IP code)
GB 50058 Specifications for the design of electric systems in places with explosion and fire
GB 50160 Fire prevention code of petrochemical enterprise design
GB 50493 Specification for design of combustible gas and toxic gas detection and alarm for petrochemical industry
3 Terms and definitions
For the purposes of this specification, the following terms and definitions apply.
3.1
sample
a small amount of required test sample taken from the fluid to determine its components or properties
3.2
sample probe
component inserted into a process pipeline or equipment to take a small amount of sample
3.3
sample take-off point
position of taking sample on process pipeline or equipment
3.4
sample return point
position of receiving returned sample on the process pipeline or equipment
3.5
sample pre-conditioner
sample conditioning such as filtration, decompression, pressurization, gasification and separation, after which, the sample shall meet the requirements of transport, conditioning and on-line analysis
3.6
sample conditioner
sample conditioning such as filtration, pressure stabilization, washing and drying, after which, the sample shall meet the requirements of on-line analysis
3.7
sample line
connecting pipeline for transporting samples from sample take-off point to sample pre-conditioner and sample conditioner
3.8
fast loop
pipeline that speed up the flow of sample and shorten the lag time of transport
3.9
sample system
sample system including sample probe, sample pre-conditioner, sample line and sample conditioner
3.10
multi-stream switch system
system for realizing multi-stream sample switch
3.11
carrier gas
gases carrying samples, such as hydrogen, nitrogen and helium
3.12
calibration gas
gas used for calibration or testing
3.13
lag time of transport
time for transporting the sample from the sample take-off point to the inlet of the on-line analyzer
3.14
response time
time from the sample entering the analyzer to the analysis showing the content of the measured component
3.15
lag time of analysis
sum of lag time of transport and response time of sample
3.16
on-line analyzer
instrument directly installed during production process, used for continuous or intermittent analysis of material components or physical parameters
3.17
linear range
linear interval spanned by the calibration curve, representing the applicability to the content or concentration of the measured component
3.18
analyzer house
prefabricated fully-enclosed facility arranged on site, which can accommodate multiple on-line analyzers
3.19
analyzer cabinet
totally enclosed cabinet installed on site, which can accommodate one or more on-line analyzer(s)
3.20
analyzer shelter
non-enclosed protective facility, consisting of ceiling and three side walls, installed on site, which is well ventilated and can accommodate one or more on-line analyzer(s)
3.21
on-line analyzer management system
system that integrates multiple on-line analyzers on the same network for centralized monitoring, management and maintenance
3.22
on-line analyzer system
system consisting of sample system, on-line analyzer and analyzer cabinet or analysis house. For large petrochemical projects, on-line analyzer management system is also included
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Sample system
5.1 Sample take-off point and sample probe
5.2 Sample transport
5.3 Sample conditioning
6 Common on-line analyzers
6.1 Gas analyzers
6.2 Liquid analyzers
7 Analyzer house
7.1 General requirements
7.2 Construction
7.3 Electrical
7.4 Heating, ventilation and air conditioning system
7.5 Safety measures
7.6 Power supply
8 On-line analyzer management system
8.1 General requirements
8.2 System composition
Annex A (Informative) Sample probe length calculation
Annex B (Informative) Calculation on lag time of transport
Annex C (Informative) Sample probe typical construction drawing
Annex D (Informative) Analyzer house typical layout drawing
Annex E (Informative) Analyzer cabinet typical layout drawing
Explanation of wording in this specification
