CN104318117A - Method for quantitative evaluation of baseplate corrosion leaking risk of oil tank - Google Patents
Method for quantitative evaluation of baseplate corrosion leaking risk of oil tank Download PDFInfo
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- CN104318117A CN104318117A CN201410602563.8A CN201410602563A CN104318117A CN 104318117 A CN104318117 A CN 104318117A CN 201410602563 A CN201410602563 A CN 201410602563A CN 104318117 A CN104318117 A CN 104318117A
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Abstract
An embodiment of the invention discloses a method for quantitative evaluation of baseplate corrosion leaking risk of an oil tank. The method includes acquiring baseplate corrosion leaking risk parameters of the oil tank on the basis of designing parameters, environment parameters and using time parameters of the oil tank and corrosion parameters of a stored oil product; acquiring leaking consequence parameters of the oil tank on the basis of the environment parameters of the oil tank, population distribution parameters of a position where the oil tank is located, and pipeline line influence parameters; acquiring leaking buffering parameters of the oil tank on the basis of cofferdam parameters, emergency processing parameters and peripheral containing parameters corresponding to the oil tank; acquiring comprehensive index of the baseplate corrosion leaking risk of the oil tank on the basis of the baseplate corrosion leaking risk parameters, the leaking consequence parameters and the leaking buffering parameters.
Description
Technical field
The present invention relates to Oil & Gas Storage equipment Risk assessment technique field, be specifically related to a kind of oil tank bottom plate corrosion leakage quantifying risk evaluation method.
Background technology
Oil tank bottom plate suffers to corrode the most serious position in each parts of oil tank, and be difficult to directly find, will directly cause stopping using after leakage, repairing difficulty, be therefore the emphasis of oil tank risk management.Oil pipeline and storage enterprise utilizes the corrosion condition of online measuring technique to oil tank bottom plate to evaluate mostly, according to the order of severity reasonable arrangement oil tank can opening turnaround plan of testing result.The formulation in oil tank on-line checkingi cycle is according to " vertical cylinder steel welding oil tank Operation and Maintenance repairs code " (SY/T5921-2011) regulation: the checking and appraising of oil tank generally arrives in the previous year in the repair cycle and carries out; One-time detection evaluation should be carried out every year for the oil tank extending the repair cycle.
But, prior art is the oil tank on-line checkingi plan according to cycle formulation, sense cycle is according to determining the tenure of use of oil tank, make the security performance that there is more oil tank higher, oil tank without the need to detecting also detects, and quantitatively sort according to the Corrosion of base plate risk of leakage of oil tank, excessive risk of giving priority in arranging for oil tank carries out on-line checkingi, detection delayed by low-risk oil tank, formulate and greatly will save oil tank on-line checkingi expense based on the oil tank detection plan of risk, thus make in prior art, to be badly in need of a kind of method that Corrosion of base plate risk of leakage to oil tank carries out quantitatively detection.
Summary of the invention
The embodiment of the present invention, by providing a kind of oil tank bottom plate corrosion leakage quantifying risk evaluation method, can detect the Corrosion of base plate risk of leakage aggregative index of oil tank accurately, can realize quantitatively sorting to the Corrosion of base plate risk of leakage of oil tank.
Embodiments provide a kind of oil tank bottom plate corrosion leakage quantifying risk evaluation method, described method comprises:
Based on the design parameter of oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product, obtain the Corrosion of base plate risk of leakage parameter of described oil tank;
Based on the environmental parameter of described oil tank, the population distribution parameter of described oil tank present position and pipe-line affecting parameters, obtain the leakage consequence parameter of described oil tank;
Contain parameter based on the cofferdam parameter corresponding with described oil tank, emergency processing parameter and periphery, obtain the leakage buffer parameter of described oil tank;
Based on described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter, obtain the Corrosion of base plate risk of leakage aggregative index of described oil tank.
Optionally, the described design parameter based on oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product, obtain the Corrosion of base plate risk of leakage parameter of described oil tank, specifically comprise:
Based on the design parameter of described oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product, obtain the For Evaluation of Internal Corrosion Degree parameter of described oil tank and outer corrosion evaluation parameter;
Based on described For Evaluation of Internal Corrosion Degree parameter and described outer corrosion evaluation parameter, obtain the Corrosion of base plate risk of leakage parameter of described oil tank.
Optionally, described based on described For Evaluation of Internal Corrosion Degree parameter and described outer corrosion evaluation parameter, obtain the Corrosion of base plate risk of leakage parameter of described oil tank, specifically comprise:
Based on the bottom thickness of described For Evaluation of Internal Corrosion Degree parameter, described outer corrosion evaluation parameter, preset base plate thickness and described oil tank ratio and described service time parameter, obtain the Corrosion of base plate risk of leakage parameter of described oil tank.
Optionally, described based on described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter, obtain the Corrosion of base plate risk of leakage aggregative index of described oil tank, be specially:
R＝L×C×M
F
Wherein, R is the Corrosion of base plate risk of leakage aggregative index of oil tank; L is Corrosion of base plate risk of leakage parameter; C is for leaking consequence parameter; M
ffor leaking buffer parameter.
Optionally, after the Corrosion of base plate risk of leakage aggregative index of the described oil tank of described acquisition, described method also comprises:
According to described Corrosion of base plate risk of leakage aggregative index, the Corrosion of base plate of described oil tank is leaked and carries out risk stratification;
According to the risk class of described oil tank, obtain the sense cycle of described oil tank.
The one or more technical schemes provided in the embodiment of the present invention, at least have following technique effect or advantage:
Because the embodiment of the present application is after the Corrosion of base plate risk of leakage parameter obtaining described oil tank, leakage consequence parameter and leakage buffer parameter, based on above-mentioned three parameters obtained, obtain the Corrosion of base plate risk of leakage aggregative index of described oil tank, so, the described Corrosion of base plate risk of leakage aggregative index obtained more can be mated with described oil tank, and then make the described Corrosion of base plate risk of leakage aggregative index of acquisition more accurate, can realize quantitatively sorting to the Corrosion of base plate risk of leakage of oil tank more accurately.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of a kind of oil tank bottom plate corrosion leakage quantifying risk evaluation method in the embodiment of the present invention;
Fig. 2 is the structural representation of the Corrosion of base plate risk of leakage aggregative index of oil tank in the embodiment of the present invention in transfer station.
Embodiment
The embodiment of the present invention, by providing a kind of oil tank bottom plate corrosion leakage quantifying risk evaluation method, can detect the Corrosion of base plate risk of leakage aggregative index of oil tank accurately, can realize quantitatively sorting to the Corrosion of base plate risk of leakage of oil tank.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
As shown in Figure 1, the embodiment of the present application provides a kind of oil tank bottom plate corrosion leakage quantifying risk evaluation method, and described method comprises:
Step 101: based on the design parameter of oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product, obtain the Corrosion of base plate risk of leakage parameter of described oil tank;
Step 102: based on the environmental parameter of described oil tank, the population distribution parameter of described oil tank present position and pipe-line affecting parameters, obtain the leakage consequence parameter of described oil tank;
Step 103: contain parameter based on the cofferdam parameter corresponding with described oil tank, emergency processing parameter and periphery, obtains the leakage buffer parameter of described oil tank;
Step 104: based on described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter, obtains the Corrosion of base plate risk of leakage aggregative index of described oil tank.
Wherein, in a step 101, can gather the design parameter of oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product, then according to the design parameter of described oil tank gathered, environmental parameter, service time parameter and store the corrosion parameter of oil product, obtain the For Evaluation of Internal Corrosion Degree parameter of described oil tank and outer corrosion evaluation parameter, again based on described For Evaluation of Internal Corrosion Degree parameter and described outer corrosion evaluation parameter, obtain the Corrosion of base plate risk of leakage parameter of described oil tank.
In specific implementation process; gather the design parameter of described oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product time; the correlation parameters such as the drying parameter of described oil tank, stray current interference parameter, tank internal coating condition parameter, atmospheric corrosiveness, tank external coating condition parameter and cathode protection condition parameter can also be gathered; set up index system from the aspect such as internal corrosion, outer corrosion, obtain described Corrosion of base plate risk of leakage parameter with this.
Specifically, because the base plate of oil tank is mainly subject to by internal corrosion the corrosion parameter storing oil product itself, tank internal drainage situation, and the impact of tank inner coating protection validity, therefore, can according to the corrosion parameter of the storage oil product in oil tank historical data, tank internal drainage situation and tank inner coating protection validity, set up For Evaluation of Internal Corrosion Degree parameter, after setting up described For Evaluation of Internal Corrosion Degree parameter, according to the corrosion parameter of the storage oil product of the described oil tank obtained, tank internal drainage situation and tank inner coating protection validity, thus the For Evaluation of Internal Corrosion Degree parameter of described oil tank can be obtained.
Concrete, described For Evaluation of Internal Corrosion Degree parameter comprises draining corrosion index corresponding to oil corrosion index corresponding to described storage oil product, described pipe internal drainage and internal coating corrosion index corresponding to described tank inner coating protection validity, wherein, described oil corrosion index specifically can be determined according to the corrosivity of described storage oil product, if described storage oil product has highly corrosive, then described oil corrosion index is larger; If described storage oil product has low-corrosiveness, then described oil corrosion index is less, and the span of described oil corrosion index is 0 ~ 10.
Such as, see table 1, for oil tank A, display in table 1 be the corrosivity of storage oil product in oil tank A and the corresponding relation of oil corrosion index, wherein, described highly corrosive refers to the oil product causing base plate pitting factor to be greater than 0.2mm/, and described moderate corrosion refers to and causes base plate pitting factor to be the corrosivity of the storage oil product between 0.13mm/ to 0.2mm/ year, and described low-corrosiveness refers to the corrosivity causing base plate pitting factor to be less than the storage oil product of 0.13mm/.
| Store the corrosivity of oil product | Oil corrosion index |
| Highly corrosive | 8 |
| Moderate corrosion | 5 |
| Low-corrosiveness | 2 |
Table 1
Secondly, whether described draining corrosion index carries out draining to determine after specifically can receiving oil product according to oil tank, and after each reception oil product, all carry out draining, then described draining corrosion index is less; If after receiving oil product each, do not carry out draining, then described draining corrosion index is comparatively large, and the value of described draining corrosion index is specifically as follows 0 ~ 10.
Such as, see table 2, for oil tank A, in table 2, display is the tank internal drainage situation of oil tank A and the corresponding relation of draining corrosion index.
| Tank internal drainage situation | Draining corrosion index |
| Carry out draining weekly or after each reception oil product | 0 |
| Do not carry out draining weekly or after each reception oil product | 2 |
Table 2
Further, described internal coating corrosion index is mainly determined from tank erection standard, oil tank tenure of use, the internal coating mass parameter such as temperature that stores oil product, tank erection standard is higher, oil tank temperature variation that is shorter, that store oil product tenure of use is little, then described tank inner coating protection validity is higher, makes described internal coating corrosion index less; Otherwise described tank inner coating protection validity is lower, makes internal coating corrosion index larger, wherein, the span of described internal coating corrosion index is 0% ~ 100%.
Such as, see table 3, for oil tank A, in table 3, display is the internal coating mass parameter of oil tank A and the corresponding relation of internal coating corrosion index, wherein, described internal coating mass parameter for poor, refer to that described tank erection standard is lower, oil tank tenure of use more than 8 years, the situation of temperature variation more than 30 DEG C of storage oil product; Described external coating mass parameter is general, refers to that described tank erection standard is medium, oil tank tenure of use is 5 years ~ 8 years, stores the temperature variation of oil product the situation of 20 DEG C ~ 30 DEG C; Described internal coating mass parameter as well, refer to described tank erection standard better, oil tank to be no more than 5 years tenure of use, the temperature variation that stores oil product is no more than the situation of 20 DEG C.
| Internal coating mass parameter | Internal coating corrosion index |
| Difference | 90％ |
| Generally | 50％ |
| Good | 20％ |
Table 3
Concrete, after acquisition described oil corrosion index, described draining corrosion index and described internal coating corrosion index, the computing formula (1) of described For Evaluation of Internal Corrosion Degree parameter is as follows:
For Evaluation of Internal Corrosion Degree parameter=(oil corrosion index+draining corrosion index) × internal coating corrosion index, formula (1), thus described For Evaluation of Internal Corrosion Degree parameter can be obtained according to above-mentioned formula (1).
Specifically, base plate due to oil tank corrodes main by atmospheric corrosion outward, the basal status of oil tank, stray current disturbed condition, the impact of tank external coating protection validity and cathodic protection validity, therefore, can according to the atmospheric corrosiveness in oil tank historical data, the drying parameter of described oil tank, stray current interference parameter, tank external coating condition parameter and cathode protection condition parameter, set up outer corrosion evaluation index, after setting up described outer corrosion evaluation index, according to the atmospheric corrosiveness corresponding with described oil tank obtained, the drying parameter of described oil tank, stray current interference parameter, tank external coating condition parameter and cathode protection condition parameter, thus the outer For Evaluation of Internal Corrosion Degree parameter of described oil tank can be obtained.
Concrete, described outer corrosion evaluation index comprises external coating corrosion index corresponding to atmospheric corrosion index corresponding to described atmospheric corrosiveness, the dry corrosion index corresponding to drying parameter of described oil tank, the electrolytic corrosion index that described stray current interference parameter is corresponding, described tank external coating condition parameter and cathodic corrosion index corresponding to described cathode protection condition parameter, wherein, described atmospheric corrosion index specifically can be determined according to the corrosivity of air, if have highly corrosive at described air, then described atmospheric corrosion index is larger; If described air has low-corrosiveness, described atmospheric corrosion index is less, and the span of described atmospheric corrosion index is 0 ~ 10.
Such as, see table 4, for oil tank A, display in table 1 be the corresponding relation of atmospheric corrosiveness that oil tank A is corresponding and atmospheric corrosion index, wherein, described highly corrosive refers to the atmospheric environment that annual relative humidity is greater than 75%, and described moderate corrosion refers to the atmospheric environment of annual relative humidity between 60% to 75%, and described low-corrosiveness refers to the atmospheric environment that annual relative humidity is less than 60%.
| Atmospheric corrosiveness | Atmospheric corrosion index |
| High | 3 |
| In | 2 |
| Low | 1 |
Table 4
Secondly, described dry corrosion index determines according to the drying parameter of described oil tank, if the aridity of described oil tank is higher, then described dry corrosion index is less; If the aridity of described oil tank is lower, namely more moistening, then described dry corrosion index is larger, and wherein, the value of described dry corrosion index is specifically as follows 0 ~ 10.
Such as, see table 5, for oil tank A, in table 5, display is the drying parameter of oil tank A and the corresponding relation of dry corrosion index, wherein, drying in table 5 refers to that the water cut of oil tank A is 0% ~ 5%, and the general drying in table 5 refers to that the water cut of oil tank A is 5% ~ 25%, and moistening in table 5 refers to that the water cut of oil tank A is greater than 25%.
| The drying parameter of oil tank | Dry corrosion index |
| Dry | 1 |
| General drying | 2 |
| Moistening | 3 |
Table 5
Secondly, described electrolytic corrosion index determines according to the intensity of stray current interference, if the intensity of described stray current interference is higher, then described electrolytic corrosion index is larger; If the intensity of described stray current interference is lower, then described electrolytic corrosion index is less, and wherein, the value of described dry corrosion index is specifically as follows 0 ~ 5.
Such as, see table 6, for oil tank A, in table 6, display is the stray current interference parameter of oil tank A and the corresponding relation of electrolytic corrosion index.
| Stray current interference parameter | Electrolytic corrosion index |
| Annoyance level is strong | 5 |
| Annoyance level is weak | 2 |
| Unknown | 1 |
| Nothing | 0 |
Table 6
Further, described external coating index is determined according to external coating mass parameters such as tank erection standard, tenure of use and construction qualities, tank erection standard is higher, oil tank tenure of use is shorter, construction quality is higher, then described tank external coating protection validity is higher, makes described external coating index less; Otherwise described tank inner coating protection validity is lower, make described external coating index larger, wherein, the span of described external coating index is 0% ~ 100%.
Such as, see table 7, for oil tank A, in table 7, display is the external coating mass parameter of oil tank A and the corresponding relation of external coating corrosion index, wherein, described outer internal coating mass parameter for poor, refer to that described tank erection standard is lower, oil tank tenure of use more than 8 years, the poor situation of construction quality; Described external coating mass parameter is general, refers to that described tank erection standard is medium, oil tank tenure of use is 5 years ~ 8 years, construction quality is general situation; Described external coating mass parameter is intact, refer to described tank erection standard better, oil tank is no more than 5 years tenure of use, the good situation of construction quality.
| External coating mass parameter | External coating corrosion index |
| Difference | 90％ |
| Generally | 50％ |
| Intact | 20％ |
Table 7
Further, described cathodic corrosion index is determined according to the cathodic protection system situation of coming into operation, and the time of coming into operation is longer, and current potential abnormal time is shorter, then described cathode protection condition is better, makes described cathodic corrosion index less; Otherwise then described cathode protection condition is poorer, make described cathodic corrosion index higher, wherein, the span of described cathodic corrosion index is 0% ~ 100%.
Such as; see table 8; for oil tank A; in table 8, display is the cathode protection condition parameter of oil tank A and the corresponding relation of cathodic corrosion index; wherein; in table 8, long-time current potential is abnormal refers to that the abnormal probability of current potential is greater than 50%, and in table 8, current potential is abnormal once in a while refers to that the abnormal probability of current potential is 5% ~ 10%.
| Cathodic protection system comes into operation situation | Cathodic corrosion index |
| Without cathodic protection system | 100％ |
| Long-time current potential is abnormal | 70％ |
| Current potential is abnormal once in a while | 40％ |
| To come into operation and current potential is normal always | 20％ |
Table 8
Concrete, after acquisition described atmospheric corrosion index, described dry corrosion index, described electrolytic corrosion index, described external coating corrosion index and described cathodic corrosion index, the computing formula (2) obtaining described outer corrosion evaluation parameter is as follows:
Outer corrosion evaluation parameter=(atmospheric corrosion index+dry corrosion index+electrolytic corrosion index) × external coating corrosion index × cathodic corrosion index, formula (2), thus described outer corrosion evaluation parameter can be obtained according to above-mentioned formula (2).
In specific implementation process, after the described For Evaluation of Internal Corrosion Degree parameter of acquisition and described outer corrosion evaluation parameter, can based on described For Evaluation of Internal Corrosion Degree parameter, described outer corrosion evaluation parameter, the ratio of the bottom thickness of preset base plate thickness and described oil tank and described service time parameter, obtain the Corrosion of base plate risk of leakage parameter of described oil tank, wherein, described preset base plate thickness can be such as 3mm, 5mm, 7mm is equivalent, wherein, the calculating of the described oil tank time limit, when described oil tank carried out overhaul, need from overhaul then recalculate tenure of use, if and the mode of employing polishing carries out large repairs, so calculate from production time tenure of use.
Specifically, the computing formula (3) of described Corrosion of base plate risk of leakage parameter is as follows:
Wherein, X represents Corrosion of base plate risk of leakage parameter, and S represents For Evaluation of Internal Corrosion Degree parameter, and W represents outer corrosion evaluation parameter, and H represents preset base plate thickness, and H1 represents the bottom thickness of oil tank, and T represents the service time of oil tank.
Following execution step 102, in this step, based on the environmental parameter of described oil tank, the population distribution parameter of described oil tank present position and pipe-line affecting parameters, obtains the leakage consequence parameter of described oil tank.
In specific implementation process, in the described environmental parameter of acquisition, after described population distribution parameter and described pipe-line affecting parameters, according to historical data during tank leakage, from accident to personnel, environment, the hazard analysis and HACCP that the aspects such as production run impact select corresponding index reflection accident to occur, namely the environmental consequence corresponding with described environmental parameter is obtained, the population consequence corresponding with described population distribution parameter and the production consequence corresponding with described pipe-line affecting parameters, thus set up Tank corrosion leakage Consequence Assessment index system, set up the evaluation criterion of each index and corresponding weight.
Wherein, described environmental parameter refers to the water body situation around described oil tank in 500,600,1000 meters of (m) scopes, in like manner, described population distribution parameter refers to the population distribution situation around oil tank in 500,600,1000 meters of (m) scopes, described pipe-line affecting parameters refers to the pipe-line distribution situation around oil tank in 500,600,1000 meters of (m) scopes, and lower mask body is for 500 meters of scopes.
Specifically, when described environmental consequence refers to described tank leakage, according to described environmental parameter, obtain the degree to the influence on water body within the scope of around described oil tank 500 meters, wherein, described water body comprises lake, seasonal stream, continues there are the types such as water river, brook, pond, water channel, and wherein, the span of the index of described environmental consequence is 1 ~ 5.
Such as, see table 9, for oil tank A, in table 9 display be oil tank A leak time, the corresponding relation of the index of environmental parameter and environmental consequence, wherein, around oil tank A, within the scope of 500m, water body resource is abundanter, then the index of described environmental consequence is larger, otherwise then the index of described environmental consequence is less.
| Environmental parameter | The index of environmental consequence |
| There is drinking water source, large-size lake, river | 5 |
| There is medium-sized lake, river | 4 |
| Exist and continue have the small rivers of water, seasonal Large River | 3 |
| There is pond, water channel | 2 |
| Without water body | 1 |
Table 9
Specifically, when described personnel's consequence refers to described tank leakage, according to described population distribution parameter, obtain the personnel's effect within the scope of around described oil tank 500 meters, the span of the index of described personnel's consequence is 1 ~ 5.
Such as, see table 10, for oil tank A, in table 10 display be oil tank A leak time, the corresponding relation of the index of population distribution parameter and personnel's consequence, wherein, around oil tank A, within the scope of 500m, population distribution density is larger, then the index of described personnel's consequence is larger, otherwise then the index of described personnel's consequence is less.
| Population distribution parameter | The index of personnel's consequence |
| There is the buildings of more than 4 layers, city | 5 |
| Cities and towns, county-level city, the factory of one deck buildings | 4 |
| Village, village, rural area | 3 |
| Fragmentary resident family, farmland | 2 |
| Be desolate and uninhabited | 1 |
Table 10
Specifically, when described production consequence refers to described tank leakage, obtain the pipe-line affecting parameters that described oil tank is corresponding, wherein, described in pipe-line affecting parameters, the span of the index of production consequence is 1 ~ 5.
Such as, see table 11, for oil tank A, in table 11 display be oil tank A leak time, the corresponding relation of the influence degree of pipe-line and the index of production consequence, wherein, when oil tank A leaks, obtain the pipe-line corresponding with oil tank A, and the influence degree of transporting oil to described pipe-line, when the scope of the stopping transportation making described pipe-line is larger, then the index of described production consequence is larger, otherwise then the index of described production consequence is less.
| The influence degree of pipe-line | The index of production consequence |
| Stopping transportation completely | 5 |
| Downstream stopping transportation | 3 |
| On-line production | 1 |
Table 11
In specific implementation process, after the index obtaining the index of described environmental consequence, the index of personnel's consequence and production consequence, the index of the index of the index of described environmental consequence, personnel's consequence and production consequence is substituted in formula (4), the leakage consequence parameter of the described oil tank of described acquisition, wherein, formula (4) is:
Leak consequence parameter=Max (index of personnel's consequence, the index of production consequence, the index of environmental consequence).
Following execution step 103, in this step, contains parameter based on the cofferdam parameter corresponding with described oil tank, emergency processing parameter and periphery, obtains the leakage buffer parameter of described oil tank.
Wherein, the execution sequence of step 101, step 102, step 103 can combination in any, can perform step 101, step 102 and step 103 simultaneously, also can first perform step 103, perform step 102 again, finally perform step 101, the application does not do concrete restriction.
In specific implementation process, the leakage consequence of described oil tank also needs to consider cofferdam quality, emergency lagoon, the buffer factors such as difficulty or ease are contained in outside, therefore, parameter can be contained based on the cofferdam parameter corresponding with described oil tank, emergency processing parameter and periphery, obtain the leakage buffer parameter of described oil tank, again according to the corresponding parameter that described buffer parameter and above-mentioned 2 steps obtain, obtain the Corrosion of base plate risk of leakage aggregative index of described oil tank.
Specifically, parameter is being contained based on the cofferdam parameter corresponding with described oil tank, emergency processing parameter and periphery, when obtaining the leakage buffer parameter of described oil tank, can obtain the cofferdam index corresponding with described cofferdam parameter, the emergent index corresponding with described emergency processing parameter and contain parameter contraposition with described periphery contain index; Again based on described cofferdam index, described emergent index with describedly contain index, obtain described leakage buffer parameter.
Concrete, described cofferdam index is determined according to cofferdam quality, if cofferdam quality is better, then described cofferdam index is less; Otherwise then described cofferdam index is larger, wherein, the span of described cofferdam index is 0% ~ 100%.
Such as, see table 12, for oil tank A, in table 7, display is the cofferdam parameter of oil tank A and the corresponding relation of cofferdam index, and wherein, if parameter characterization cofferdam, described cofferdam quality is for poor, then described cofferdam index is 100%; If parameter characterization cofferdam, described cofferdam quality is general, then described cofferdam index is 50%; If parameter characterization cofferdam, described cofferdam quality as well, then described cofferdam index is 10%.
| Cofferdam quality | Cofferdam index |
| Difference | 100％ |
| Generally | 50％ |
| Good | 10％ |
Table 12
Concrete, whether whether described emergent index determined according to having emergency lagoon and emergency lagoon normally to work, if the probability that described emergency processing parameter characterization emergency lagoon normally works is higher, then described emergent index is less; Otherwise then described emergent index is larger, wherein, the span of described emergent index is 0% ~ 100%.
Such as, see table 13, for oil tank A, in table 7, display is the emergency processing parameter of oil tank A and the corresponding relation of emergent index.
| Emergency processing parameter | Emergent index |
| Nothing | 100％ |
| Have, but emergency condition cisco unity malfunction | 100％ |
| Have, emergency condition can normally work | 10％ |
Table 13
Concrete, described in contain index be do to determine according to the complexity contained during tank leakage, if to contain the difficulty degree that parameter characterization contains higher in described periphery, then contain index described in larger; Otherwise, then contain index described in less, wherein, described in contain index span be 0% ~ 100%.
Such as, see table 13, for oil tank A, in table 7, display is that parameter and the corresponding relation containing index are contained in the periphery of oil tank A.
| Complexity is contained in outside | Contain index |
| Easily contain | 50％ |
| Generally | 80％ |
| Be not easy to contain | 90％ |
Table 14
In specific implementation process, acquisition described cofferdam index, described emergent index and described contain index after, described leakage buffer parameter is obtained according to formula (5), wherein, described formula (5) is specially: leakage buffer parameter=cofferdam index × emergent index × contain index, thus can obtain described leakage buffer parameter by described formula (5).
Following execution step 104, in this step, based on described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter, obtains the Corrosion of base plate risk of leakage aggregative index of described oil tank.
In specific implementation process, after obtained described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter by step 101, step 102 and step 103, determine quantitative calculation and mathematical function; From accident probability and the consequence extent of injury, set up oil tank bottom plate corrosion leakage risk integrative index mathematical function and be specially:
R=L × C × M
fformula (6)
Wherein, R is Corrosion of base plate risk of leakage aggregative index; L is Corrosion of base plate risk of leakage parameter; C is for leaking consequence parameter; M
ffor leaking buffer parameter.
Specifically, by described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter substitute in described formula (6), thus described risk of leakage aggregative index can be obtained, because described risk of leakage aggregative index is according to described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter obtain, when take into account tank leakage, to personnel, environment, the impact of producing, and the easy degree contained, and the risk of leakage of oil tank itself, thus the described risk of leakage aggregative index obtained more is mated with described oil tank.
In another embodiment, after the Corrosion of base plate risk of leakage aggregative index of the described oil tank of described acquisition, described method also comprises: according to described Corrosion of base plate risk of leakage aggregative index, leaks carry out risk stratification to the Corrosion of base plate of described oil tank; According to the risk class of described oil tank, obtain the sense cycle of described oil tank.
In specific implementation process, according to the value of described Corrosion of base plate risk of leakage aggregative index, determine described risk class be divided into low, neutralize high three grades, the concrete criteria for classifying is see table 15.
| The value of Corrosion of base plate risk of leakage aggregative index | Risk class |
| >81 | High |
| 31～80 | In |
| 0～30 | Low |
Table 15
Specifically, after the risk class dividing described oil tank, the oil tank bottom plate formulated based on risk class detects plan, make sense cycle along with the raising of risk class, sense cycle is also thereupon elongated, if described sense cycle is along with the reduction of risk class, described sense cycle also shortens thereupon, wherein, if the risk class of described oil tank is high, then described sense cycle can for the time limit being not more than half a year or 1 year etc. 1 year; If during the risk class of described oil tank is, then described sense cycle can be the time limit of 1 year to 3 years; If the risk class of described oil tank is low, then described sense cycle can for the time limit being greater than 3 years.
In actual application, as shown in Figure 2, shown in one transfer station oil tank bottom plate corrosion leakage risk evaluation results, pass through said method, the risk of emphasis to Corrosion of base plate leakage accident quantitatively sorts, index comprehensive evaluation is used to characterize integrated risk, wherein, 7 oil tank numberings in this station are respectively 1#, 2#, 3#, 4#, 5#, 6#, 7#, pass through on-the-spot investigation, focal investigation and look-see combine, collect related data and data, evaluate the corrosion leakage risk that oil tank bottom plate may exist, and evaluation and quantitatively sequence are carried out to oil tank bottom plate corrosion risk in station, thus solve the problem that cannot quantize to sort of existing oil tank bottom plate corrosion leakage risk management existence.
Wherein, have collected the Oil Tank Design parameter of 7 oil tanks, oil corrosion, tank base, stray current interference, internal coating situation, air, external coating situation, cathode protection condition, tenure of use, water body, population distribution related data; showing 2#, 5# oil tank bottom plate corrosion leakage risk according to evaluation result is excessive risk; 1#, 4#, 6# oil tank bottom plate corrosion leakage risk is medium risk; 3# and 7# oil tank bottom plate corrosion leakage risk is low-risk, can formulate next year oil tank detection plan according to evaluation result.
The one or more technical schemes provided in the embodiment of the present invention, at least have following technique effect or advantage:
One, be in the Corrosion of base plate risk of leakage parameter obtaining described oil tank, leak consequence parameter and leak after buffer parameter due to the embodiment of the present application, based on above-mentioned three parameters obtained, obtain the Corrosion of base plate risk of leakage aggregative index of described oil tank, so, the described Corrosion of base plate risk of leakage aggregative index obtained more can be mated with described oil tank, and then make the described Corrosion of base plate risk of leakage aggregative index of acquisition more accurate, can realize quantitatively sorting to the Corrosion of base plate risk of leakage of oil tank more accurately.
Two, because the embodiment of the present application is after the Corrosion of base plate risk of leakage aggregative index of the described oil tank of described acquisition, also according to described Corrosion of base plate risk of leakage aggregative index, the Corrosion of base plate of described oil tank is leaked and carries out risk stratification; According to the risk class of described oil tank, obtain the sense cycle of described oil tank, under the prerequisite of security performance guaranteeing described oil tank, the probability of excess detector can be reduced, reduce testing cost.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. an oil tank bottom plate corrosion leakage quantifying risk evaluation method, is characterized in that, described method comprises:
Based on the design parameter of oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product, obtain the Corrosion of base plate risk of leakage parameter of described oil tank;
Based on the environmental parameter of described oil tank, the population distribution parameter of described oil tank present position and pipe-line affecting parameters, obtain the leakage consequence parameter of described oil tank;
Contain parameter based on the cofferdam parameter corresponding with described oil tank, emergency processing parameter and periphery, obtain the leakage buffer parameter of described oil tank;
Based on described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter, obtain the Corrosion of base plate risk of leakage aggregative index of described oil tank.
2. evaluation method as claimed in claim 1, is characterized in that, the described design parameter based on oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product, obtain the Corrosion of base plate risk of leakage parameter of described oil tank, specifically comprise:
Based on the design parameter of described oil tank, environmental parameter, service time parameter and store the corrosion parameter of oil product, obtain the For Evaluation of Internal Corrosion Degree parameter of described oil tank and outer corrosion evaluation parameter;
Based on described For Evaluation of Internal Corrosion Degree parameter and described outer corrosion evaluation parameter, obtain the Corrosion of base plate risk of leakage parameter of described oil tank.
3. evaluation method as claimed in claim 2, is characterized in that, described based on described For Evaluation of Internal Corrosion Degree parameter and described outer corrosion evaluation parameter, obtains the Corrosion of base plate risk of leakage parameter of described oil tank, specifically comprises:
Based on the bottom thickness of described For Evaluation of Internal Corrosion Degree parameter, described outer corrosion evaluation parameter, preset base plate thickness and described oil tank ratio and described service time parameter, obtain the Corrosion of base plate risk of leakage parameter of described oil tank.
4. evaluation method as claimed in claim 3, is characterized in that, described based on described Corrosion of base plate risk of leakage parameter, described leakage consequence parameter and described leakage buffer parameter, obtains the Corrosion of base plate risk of leakage aggregative index of described oil tank, is specially:
R＝L×C×M
F
Wherein, R is the Corrosion of base plate risk of leakage aggregative index of oil tank; L is Corrosion of base plate risk of leakage parameter; C is for leaking consequence parameter; M
ffor leaking buffer parameter.
5. evaluation method as claimed in claim 4, it is characterized in that, after the Corrosion of base plate risk of leakage aggregative index of the described oil tank of described acquisition, described method also comprises:
According to described Corrosion of base plate risk of leakage aggregative index, the Corrosion of base plate of described oil tank is leaked and carries out risk stratification;
According to the risk class of described oil tank, obtain the sense cycle of described oil tank.
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