CN109359892A - A method of the unit check period is determined according to equipment Risk grade - Google Patents
A method of the unit check period is determined according to equipment Risk grade Download PDFInfo
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Abstract
A method of the unit check period being determined according to equipment Risk grade, whether S1, confirmation equipment to be checked carried out first inspection, and if carrying out first inspection without if, if having carried out first inspection, be transferred to S2；S2, the round of visits correction factor a that equipment all parts to be checked are determined by following formulai=FRi×FCi×FM×FL；The corrosion mechanism of S3, confirmation equipment to be checked, and calculate the reasonable check period of equipment to be checked；The beneficial effects of the present invention are: carrying out risk assessment to equipment according to API581 standard, assessment result includes management level score value, equipment all parts failure probability and failure consequence, equipment damage (stress corrosion cracking, high temperature hydrogen damage) sensibility etc., and the inspection testing result of bonding apparatus formulates the reasonable round of visits of equipment.
Description
Technical field
The invention belongs to unit check detection fields, and in particular to a kind of to determine that equipment is rationally examined according to equipment Risk grade
The method for testing the period.
Background technique
The round of visits for formulating equipment or pipeline domestic at present is generally according to TSG 21-2016 " fixed pressure vessel peace
Full technology Supervision Code " and TSG D7005-2018 " pressure pipeline periodic inspection rule --- industrial pipeline " execute, have
The round of visits of body is determined according to safety status grade, is examined within equipment general 3~6 years, is examined within pressure line general 3~6 years,
GC3 pipeline is no more than 9 years.Two standards have also received the world in these years, domestic scientific and technological achievement simultaneously, introduce based on wind
The concept of the inspection (RBI) of danger, standard regulation: pressure vessel or pressure pipeline can be according to equipment when formulating round of visits
Risk level extends or shortens round of visits.The country is in relation to the technical regulation GBT26610.2-2014 pressure-bearing based on risk inspection
Device systems, which implement Maintain strategy of the directive/guide part 2 based on risk based on the inspection of risk, also similar regulation: formulating and examines
It need to be implemented according to the risk and risk acceptable level of equipment when tactful；Risk acceptable level is by using unit real according to itself
Border situation determines, government is considered as when determining about the basic demand of personnel safety and using the social responsibility of unit.According to setting
Standby risk need to consider the risk acceptable level of equipment or pipeline when formulating round of visits, but it is domestic do not set up also it is unified can
Receive risk level, and enterprise to acceptable risk understand be not also it is very much, the formulation enterprises for being difficult science can
Receive risk level, these all give Practical Project risk analysis and the formulation of Maintain strategy band many difficulties.For this purpose, having very much
Necessity provides a practicable risk according to equipment, considers that the factors such as failure mechanism, management formulate the unit check period
Method.
Summary of the invention
To solve the above-mentioned problems, unit check week is determined according to equipment Risk grade the object of the present invention is to provide a kind of
The method of phase can consider that the factors such as failure mechanism, management level formulate the unit check period according to the risk of equipment.
The present invention provides the following technical solutions:
A method of the unit check period is determined according to equipment Risk grade, is included the following steps:
S1, it gives a mark to the management level of full factory, obtains management assessment score；The risk class of equipment to be checked is calculated,
Obtain the failure probability grade and equipment failure consequence grade of equipment all parts to be checked；If equipment to be checked has stress corrosion cracking
Or high temperature hydrogen micromechanism of damage, obtain stress corrosion cracking or high temperature hydrogen susceptibility to damage be "high" or " in " or " low "；Confirmation to
Whether inspection equipment carried out first inspection, if carrying out first inspection without if, if having carried out first inspection, was transferred to S2；
S2, the round of visits correction factor that equipment all parts to be checked are determined by following formula
ai=FRi×FCi×FM×FL, i=1,2 ... n
Wherein, aiFor i-th of unit check cycle correction coefficient, FRiFor i-th of component failure probability correction factor, FCiFor
I-th of component failure consequence correction factor, FMTo manage correction factor, FLIt extends service in the army for equipment, genetic defects correction factor,
F in this methodLTake 1；
The corrosion mechanism of S3, confirmation equipment to be checked, and the reasonable check period of equipment to be checked is calculated, specific step is as follows,
If the corrosion mechanism of S31, equipment to be checked be thinned corrosion comprising n component, then by following formula calculating to
The round of visits of each component of equipment is examined,
taci=((δti1-δi)/νi)×ai, i=1,2 ... n
Wherein,
taciFor the round of visits of i-th of component, δti1For minimum of i-th of component when being measured for the last time in the overhaul period
Wall thickness, νiFor the corrosion rate of i-th of component, δiFor minimum wall thickness (MINI W.) needed for i-th of component pressure-bearing, aiFor i-th of unit check week
Phase correction factor；
It is calculated by the following formula the corrosion rate of each component of equipment to be checked,
νi=(δti2-δti1)/tdiI=1,2 ... n
Wherein,
νiFor the corrosion rate of i-th of component, δti1For minimum of i-th of component when being measured for the last time in the overhaul period
Wall thickness, δti2Minimum wall thickness (MINI W.) when being measured for i-th of component second from the bottom time, tdiFor i-th of component last time measurement and inverse
The interval time of second of measurement；
It is calculated by the following formula the theory testing period of equipment to be checked,
tac=min (tac1, tac2..., tacn)
Wherein,
tacFor the theory testing period of equipment to be checked, tac1For the theory testing period of first component, tac2It is second
The theory testing period of component, tacnFor the theory testing period of n-th of component,
By equipment theory testing period t to be checkedacUpward rounding obtains an integer value trac；
It is calculated by the following formula the reasonable check period of equipment to be checked
tlC=min (trac, 9)
Wherein,
tlCFor the reasonable check period of equipment to be checked under thinned corrosion, tracFor the theory testing period of equipment to be checked, 9 are
The equipment longest round of visits to be checked of national Specification, unit year；
If the corrosion mechanism of S32, equipment to be checked is that corrosion and stress corrosion cracking is thinned, subtracted first by S31 acquisition
The reasonable check period t of equipment to be checked under thin corrosionIC, it is calculated by the following formula and equipment to be checked under corrosion and stress corrosion is thinned
The reasonable check period,
T1=min (tIC, tN1)
Wherein,
T1For the reasonable check period that corrosion with equipment to be checked under stress corrosion is thinned, tICFor equipment to be checked under corrosion is thinned
The reasonable check period, tN1For the reasonable check period of equipment to be checked under stress corrosion,
It is calculated by the following formula the reasonable check period of equipment to be checked under stress corrosion,
When equipment to be checked finds stress corrosion cracking and does not eliminate,
tN1=tPJ
Wherein,
tPJFor the round of visits provided after together in the evaluation used；
When equipment to be checked do not find stress corrosion cracking and cracking sensitivity be "high" or " in " when,
tN1=tDX
Wherein, tDXIt was equipment to be checked from Check-Out Time last time to the period between the next overhaul time；
When equipment to be checked does not find stress corrosion cracking and cracking sensitivity is " low ",
tN1=6；
If the corrosion mechanism of S33, equipment to be checked is that corrosion and high temperature hydrogen damage is thinned, is obtained be thinned by S31 first
The reasonable check period t of equipment to be checked under corrosionlC, it is calculated by the following formula and equipment to be checked under corrosion and high temperature hydrogen damage is thinned
The reasonable check period,
T2=min (tIC, tN2)
Wherein, T2For the reasonable check period that corrosion with equipment to be checked under high temperature hydrogen damage is thinned, tICTo be thinned under corrosion
The reasonable check period of equipment to be checked, tN2For the reasonable check period of equipment to be checked under high temperature hydrogen damage；
It is calculated by the following formula the reasonable check period of equipment to be checked under high temperature hydrogen damage,
When equipment to be checked finds high temperature hydrogen damage and does not eliminate,
tN2=tPJ
Wherein,
tPJFor the round of visits provided after together in the evaluation used；
When equipment to be checked do not find high temperature hydrogen damage and hydrogen damage sensibility be "high" or " in " when,
tN2=tDX
Wherein, tDXIt was equipment to be checked from Check-Out Time last time to the period between the next overhaul time,
When equipment to be checked does not find high temperature hydrogen damage and hydrogen damage sensibility is " low ",
tN2=6.
Preferably, it in the S1, according to API581 standard, is beaten by management level of the expert graded to full factory
Point, obtain management assessment score.
Preferably, it in the S1, according to the risk class of API581 criterion calculation equipment all parts to be checked, obtains to be checked
The failure probability grade of equipment all parts be 1 or 2 or 3 or 4 or 5 and the failure consequence of equipment all parts to be checked be A,
Or B or C or D or E.
Preferably, when the failure probability grade of i-th of component is 1, failure probability correction factor is 0.5；When i-th
When the failure probability grade of component is 2, failure probability correction factor is 0.6；When the failure probability grade of i-th of component is 3
When, failure probability correction factor is 0.7；When the failure probability grade of i-th of component is 4, failure probability correction factor
It is 0.8；When the failure probability grade of i-th of component is 5, failure probability correction factor is 0.9；
When the failure consequence grade of i-th of component is A, failure consequence correction factor is 0.5；When i-th component
When failure consequence grade is B, failure consequence correction factor is 0.6；When the failure consequence grade of i-th of component is C, lose
Imitating consequence correction factor is 0.7；When the failure consequence grade of i-th of component is D, failure consequence correction factor is 0.8；When
When the failure consequence grade of i-th of component is E, failure consequence correction factor is 0.9；
When management assessment is scored at 401~500, management correction factor is 0.4；When management assessment is scored at 501~600
When, management correction factor is 0.5；When management assessment is scored at 601~700, management correction factor is 0.6；Work as management assessment
When being scored at 701~800, management correction factor is 0.7；When management assessment is scored at 801~900, management correction factor is
0.8；When management assessment is scored at 901~1000, management correction factor is 0.9.
Preferably, in the S1, the stress corrosion cracking or high temperature hydrogen damage of equipment to be checked are determined according to API581 standard
Sensibility be "high", " in " or " low ".
The beneficial effects of the present invention are: carrying out risk assessment to equipment according to API581 standard, assessment result includes management
Horizontal score value, equipment all parts failure probability and failure consequence, equipment damage (stress corrosion cracking, high temperature hydrogen damage) are sensitive
Property etc., the inspection testing result of bonding apparatus can accurately formulate the reasonable round of visits of equipment.
Specific embodiment
The present invention is illustrated combined with specific embodiments below.
Embodiment 1
A method of the unit check period is determined according to equipment Risk grade, is included the following steps:
S1, it gives a mark to the management level of full factory, obtains management assessment score；The risk class of equipment to be checked is calculated,
Obtain the failure probability grade and equipment failure consequence grade of equipment all parts to be checked；If equipment to be checked has stress corrosion cracking
Or high temperature hydrogen micromechanism of damage, obtain stress corrosion cracking or high temperature hydrogen susceptibility to damage be "high" or " in " or " low "；Confirmation to
Whether inspection equipment carried out first inspection, if carrying out first inspection without if, if having carried out first inspection, was transferred to S2；
S2, the round of visits correction factor that equipment all parts to be checked are determined by following formula
ai=FRi×FCi×FM×FL, i=1,2 ... n
Wherein, aiFor i-th of unit check cycle correction coefficient, FRiFor i-th of component failure probability correction factor, FCiFor
I-th of component failure consequence correction factor, FMTo manage correction factor, FLIt extends service in the army for equipment, genetic defects correction factor,
This method does not consider equipment extended active duty, birth defect the case where repairing, therefore FLTake 1；
The corrosion mechanism of S3, confirmation equipment to be checked, and the reasonable check period of equipment to be checked is calculated, specific step is as follows,
If the corrosion mechanism of S31, equipment to be checked be thinned corrosion comprising n component, then by following formula calculating to
The round of visits of each component of equipment is examined,
taci=((δti1-δi)/νi)×ai, i=1,2 ... n
Wherein,
taciFor the round of visits of i-th of component, δti1For minimum of i-th of component when being measured for the last time in the overhaul period
Wall thickness, νiFor the corrosion rate of i-th of component, δiFor minimum wall thickness (MINI W.) needed for i-th of component pressure-bearing, aiFor i-th of unit check week
Phase correction factor；
It is calculated by the following formula the corrosion rate of each component of equipment to be checked,
νi=(δti2-δti1)/tdiI=1,2 ... n
Wherein,
νiFor the corrosion rate of i-th of component, δti1For minimum of i-th of component when being measured for the last time in the overhaul period
Wall thickness, δti2Minimum wall thickness (MINI W.) when being measured for i-th of component second from the bottom time, tdiFor i-th of component last time measurement and inverse
The interval time of second of measurement；
It is calculated by the following formula the theory testing period of equipment to be checked,
tac=min (tac1, tac2..., tacn)
Wherein,
tacFor the theory testing period of equipment to be checked, tac1For the theory testing period of first component, tac2It is second
The theory testing period of component, tacnFor the theory testing period of n-th of component,
By equipment theory testing period t to be checkedacUpward rounding obtains an integer value trac；
It is calculated by the following formula the reasonable check period of equipment to be checked
tlC=min (trac, 9)
Wherein,
tlCFor the reasonable check period of equipment to be checked under thinned corrosion, tracFor the theory testing period of equipment to be checked, 9 are
The equipment longest round of visits to be checked of national Specification, unit year；
If the corrosion mechanism of S32, equipment to be checked is that corrosion and stress corrosion cracking is thinned, subtracted first by S31 acquisition
The reasonable check period t of equipment to be checked under thin corrosionIC, it is calculated by the following formula and equipment to be checked under corrosion and stress corrosion is thinned
The reasonable check period,
T1=min (tIC, tN1)
Wherein,
T1For the reasonable check period that corrosion with equipment to be checked under stress corrosion is thinned, tICFor equipment to be checked under corrosion is thinned
The reasonable check period, tN1For the reasonable check period of equipment to be checked under stress corrosion,
It is calculated by the following formula the reasonable check period of equipment to be checked under stress corrosion,
When equipment to be checked finds stress corrosion cracking and does not eliminate,
tN1=tPJ
Wherein,
tPJFor the round of visits provided after together in the evaluation used, specially according to GB/T19624-2004 " with containing
Defect Safty Evaluation of Pressure Vessels " round of visits that provides after standard rating；
When equipment to be checked do not find stress corrosion cracking and cracking sensitivity be "high" or " in " when,
tN1=tDX
Wherein, tDXIt was equipment to be checked from Check-Out Time last time to the period between the next overhaul time；
When equipment to be checked does not find stress corrosion cracking and cracking sensitivity is " low ",
tN1=6；
If the corrosion mechanism of S33, equipment to be checked is that corrosion and high temperature hydrogen damage is thinned, is obtained be thinned by S31 first
The reasonable check period t of equipment to be checked under corrosionlC, it is calculated by the following formula and equipment to be checked under corrosion and high temperature hydrogen damage is thinned
The reasonable check period,
T2=min (tIC, tN2)
Wherein, T2For the reasonable check period that corrosion with equipment to be checked under high temperature hydrogen damage is thinned, tICTo be thinned under corrosion
The reasonable check period of equipment to be checked, tN2For the reasonable check period of equipment to be checked under high temperature hydrogen damage；
It is calculated by the following formula the reasonable check period of equipment to be checked under high temperature hydrogen damage,
When equipment to be checked finds high temperature hydrogen damage and does not eliminate,
tN2=tPJ
Wherein,
tPJFor the round of visits provided after together in the evaluation used；
When equipment to be checked do not find high temperature hydrogen damage and hydrogen damage sensibility be "high" or " in " when,
tN2=tDX
Wherein, tDXIt was equipment to be checked from Check-Out Time last time to the period between the next overhaul time,
When equipment to be checked does not find high temperature hydrogen damage and hydrogen damage sensibility is " low ",
tN2=6.
Embodiment 2
On the basis of embodiment 1, the management in the S1, according to API581 standard, by expert graded to full factory
Level is given a mark, and management assessment score is obtained.
Embodiment 3
On the basis of embodiment 1, in the S1, according to the risk etc. of API581 criterion calculation equipment all parts to be checked
Grade, the failure probability grade for obtaining equipment all parts to be checked is 1 or 2 or 3 or 4 or 5 and equipment all parts to be checked
Failure consequence is A or B or C or D or E.
Embodiment 4
On the basis of embodiment 3, when the failure probability grade of i-th of component is 1, failure probability correction factor is
0.5；When the failure probability grade of i-th of component is 2, failure probability correction factor is 0.6；When the failure of i-th of component
When probability levels are 3, failure probability correction factor is 0.7；When the failure probability grade of i-th of component is 4, failure is general
Rate correction factor is 0.8；When the failure probability grade of i-th of component is 5, failure probability correction factor is 0.9；
When the failure consequence grade of i-th of component is A, failure consequence correction factor is 0.5；When i-th component
When failure consequence grade is B, failure consequence correction factor is 0.6；When the failure consequence grade of i-th of component is C, lose
Imitating consequence correction factor is 0.7；When the failure consequence grade of i-th of component is D, failure consequence correction factor is 0.8；When
When the failure consequence grade of i-th of component is E, failure consequence correction factor is 0.9；
When management assessment is scored at 401~500, management correction factor is 0.4；When management assessment is scored at 501~600
When, management correction factor is 0.5；When management assessment is scored at 601~700, management correction factor is 0.6；Work as management assessment
When being scored at 701~800, management correction factor is 0.7；When management assessment is scored at 801~900, management correction factor is
0.8；When management assessment is scored at 901~1000, management correction factor is 0.9.
Embodiment 5
On the basis of embodiment 1, in the S1, according to API581 standard determine equipment to be checked stress corrosion cracking or
High temperature hydrogen susceptibility to damage be "high", " in " or " low ".
Embodiment 6
Electrical desalter is one of key equipment in atmospheric and vacuum distillation unit, and main function is the salt removed in crude oil, level-one
Electro-desalting feeding temperature generally at 120 DEG C or more, at this temperature the salt in crude oil start hydrolysis generate hcl corrosion equipment and
Pipeline.Certain atmospheric and vacuum distillation unit level-one electrical desalter V-401A, specification170 DEG C of design temperature, design pressure
Power 2.5MPa, 145 DEG C of operation temperature, operating pressure 2.2Mpa, in September, 2012 comes into operation, and end socket, cylinder material are Q345R, builds
Wall building thickness is respectively 44mm, 40mm.Enterprise entrusts Hefei General Machinery Research Institute Special Equipment Inspection Station to Atmospheric vacuum within 2014
Device has carried out risk assessment work, is 880 points by expert graded enterprise's score according to API581 standard, according to
API581 standard evaluation result shows that the desalter end socket, cylinder failure probability are " 1 ", and failure consequence is " B ", according to
API581 criterion evaluation risk class is " low ".The device in 2015 has carried out first check, needed for end socket, cylinder pressure-bearing most
Small wall thickness is respectively 43.8mm, 29,5mm, this examine end socket, cylinder minimum wall thickness (MINI W.) measurement result be respectively 29.9mm,
30.0mm does not have found other defects.
The method that the present invention determines the unit check period according to equipment Risk grade are as follows:
Pass through the formula (a of S2i=FRi×FCi×FM×FL) calculate apparatus closing end, cylinder correction factor a.
aEnd socket=0.5 × 0.6 × 0.8=0.24, aCylinder=0.5 × 0.6 × 0.8=0.24.
It is calculated by the following formula the corrosion rate of each component of equipment to be checked,
νi=(δti2-δti1)/tdiI=1,2 ... n
νEnd socket=(44-43.8)/3=0.07mm/a；
νCylinder=(40-39.5)/3=0.17mm/a
The round of visits of each component of equipment to be checked is calculated by following formula,
taci=((δti1-δi)/νi) × a i=1,2 ... n
tAc (end socket)=((43.8-29.9)/0.07) × 0.24 ≈ 47.65
tAc (cylinder)0.24 ≈ 13.41 of=((39.5-30.0)/0.17)
It is calculated by the following formula the theory testing period of equipment to be checked,
tac=min (tac1, tac2... ..., tacn)
tac=min (47.65,13.41)=13.41
By equipment theory testing period t to be checkedacUp rounding obtains an integer value trac=14,
It is calculated by the following formula the reasonable check period of equipment to be checked
tlC=min (trac, 9)
tlC=9
Finally determine that the unit check period to be checked is 9 years.
Embodiment 7
Certain synthetic ammonia installation low temperature shift converter 04-R002 came into operation in 1996, and 233 DEG C of operation temperature, operating pressure
3.73MPa, equipment material SA516-70, it is respectively 43mm, 45mm, cylinder wall thickness 78mm that lower head, which builds wall thickness, in equipment.Dress
Set the overhaul of progress in every 4 years.It operates the hydrogen for containing about 56.7% (mol) in media technology gas, the basis under this operating condition
It is very big that a possibility that high temperature hydrogen-type corrosion, occurs for some cases.The enterprise entrusts Hefei General Machinery Institute's special equipment within 2014
Inspection point carries out risk assessment to the device, and assessment result shows that the business administration score 860 divides, three component tops of equipment point
End socket, bottom bulkhead and cylinder, three component failure probability are " 4 ", and failure consequence is equal " C ".Three components of the equipment exist
High temperature hydrogen damage, susceptibility to damage are "high".The commission associated mechanisms of enterprise in 2015 carry out detection service to the equipment, cylinder and
Bottom bulkhead thickness measuring value is respectively 45.9mm, 79.2mm.
The method that the present invention determines the unit check period according to equipment Risk grade are as follows:
Pass through the formula (a of S2i=FRi×FCi×FM×FL) calculate apparatus closing end, cylinder correction factor a.
aEnd socket=aCylinder=0.8 × 0.7 × 0.8=0.448,
Since testing result shows that the equipment barrel and end socket do not occur to be thinned, therefore:
νEnd socket=νCylinder=0, theoretically tacThere is no limit,
It is calculated by the following formula the reasonable check period of equipment to be checked,
tlC=min (trac, 9)
Therefore tlC=9
The equipment is there is also high temperature hydrogen damage and sensibility is "high",
Therefore tN2=tDX=4 years,
T2=min (tIC, tN2)=min (4,9),
Finally determine that the unit check period to be checked is 4 years.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of method for determining the unit check period according to equipment Risk grade, which comprises the steps of:
S1, it gives a mark to the management level of full factory, obtains management assessment score；The risk class for calculating equipment to be checked, obtains
The failure probability grade and equipment failure consequence grade of equipment all parts to be checked；If equipment to be checked has stress corrosion cracking or height
Warm hydrogen damage mechanism, obtain stress corrosion cracking or high temperature hydrogen susceptibility to damage be "high" or " in " or " low "；Confirm to be checked set
It is standby whether to carry out first inspection, if carrying out first inspection without if, if having carried out first inspection, it is transferred to S2；
S2, the round of visits correction factor that equipment all parts to be checked are determined by following formula
ai=FRi×FCi×FM×FL, i=1,2 ... n
Wherein, aiFor i-th of unit check cycle correction coefficient, FRiFor i-th of component failure probability correction factor, FCiIt is i-th
A component failure consequence correction factor, FMTo manage correction factor, FLFor equipment extended active duty, genetic defects correction factor, we
F in methodLTake 1；
The corrosion mechanism of S3, confirmation equipment to be checked, and the reasonable check period of equipment to be checked is calculated, specific step is as follows,
If the corrosion mechanism of S31, equipment to be checked is that corrosion is thinned comprising n component then calculates to be checked set by following formula
The round of visits of standby each component,
taci=((δti1-δi)/νi)×ai, i=1,2 ... n
Wherein,
taciFor the round of visits of i-th of component, δti1For minimal wall of i-th of component when being measured for the last time in the overhaul period
Thickness, νiFor the corrosion rate of i-th of component, δiFor minimum wall thickness (MINI W.) needed for i-th of component pressure-bearing, aiFor i-th of unit check period
Correction factor；
It is calculated by the following formula the corrosion rate of each component of equipment to be checked,
νi=(δti2-δti1)/tdiI=1,2 ... n
Wherein,
νiFor the corrosion rate of i-th of component, δti1For minimum wall thickness (MINI W.) of i-th of component when being measured for the last time in the overhaul period,
δti2Minimum wall thickness (MINI W.) when being measured for i-th of component second from the bottom time, tdiIt is measured for i-th of component last time and second from the bottom
The interval time of secondary measurement；
It is calculated by the following formula the theory testing period of equipment to be checked,
tac=min (tac1, tac2..., tacn)
Wherein,
tacFor the theory testing period of equipment to be checked, tac1For the theory testing period of first component, tac2For second component
The theory testing period, tacnFor the theory testing period of n-th of component,
By equipment theory testing period t to be checkedacUpward rounding obtains an integer value trac；
It is calculated by the following formula the reasonable check period of equipment to be checked
tlC=min (trac, 9)
Wherein,
tlCFor the reasonable check period of equipment to be checked under thinned corrosion, tracIt is country for the theory testing period of equipment to be checked, 9
Equipment longest round of visits to be checked, unit year as defined in standard；
If the corrosion mechanism of S32, equipment to be checked is that corrosion and stress corrosion cracking is thinned, is obtained by S31 corruption is thinned first
The reasonable check period t of equipment to be checked under erosionIC, it is calculated by the following formula the conjunction that corrosion with equipment to be checked under stress corrosion is thinned
Round of visits is managed,
T1=min (tIC, tN1)
Wherein,
T1For the reasonable check period that corrosion with equipment to be checked under stress corrosion is thinned, tICFor the conjunction of equipment to be checked under thinned corrosion
Manage round of visits, tN1For the reasonable check period of equipment to be checked under stress corrosion,
It is calculated by the following formula the reasonable check period of equipment to be checked under stress corrosion,
When equipment to be checked finds stress corrosion cracking and does not eliminate,
tN1=tPJ
Wherein,
tPJFor the round of visits provided after together in the evaluation used；
When equipment to be checked do not find stress corrosion cracking and cracking sensitivity be "high" or " in " when,
tN1=tDX
Wherein, tDXIt was equipment to be checked from Check-Out Time last time to the period between the next overhaul time；
When equipment to be checked does not find stress corrosion cracking and cracking sensitivity is " low ",
tN1=6；
If the corrosion mechanism of S33, equipment to be checked is that corrosion and high temperature hydrogen damage is thinned, is obtained by S31 corrosion is thinned first
Under equipment to be checked reasonable check period tlC, it is calculated by the following formula the conjunction that corrosion with equipment to be checked under high temperature hydrogen damage is thinned
Round of visits is managed,
T2=min (tIC, tN2)
Wherein, T2For the reasonable check period that corrosion with equipment to be checked under high temperature hydrogen damage is thinned, tICIt is to be checked under corrosion to be thinned
The reasonable check period of equipment, tN2For the reasonable check period of equipment to be checked under high temperature hydrogen damage；
It is calculated by the following formula the reasonable check period of equipment to be checked under high temperature hydrogen damage,
When equipment to be checked finds high temperature hydrogen damage and does not eliminate,
tN2=tPJ
Wherein,
tPJFor the round of visits provided after together in the evaluation used；
When equipment to be checked do not find high temperature hydrogen damage and hydrogen damage sensibility be "high" or " in " when,
tN2=tDX
Wherein, tDXIt was equipment to be checked from Check-Out Time last time to the period between the next overhaul time,
When equipment to be checked does not find high temperature hydrogen damage and hydrogen damage sensibility is " low ",
tN2=6.
2. a kind of method for determining the unit check period according to equipment Risk grade according to claim 1, feature exist
In, in the S1, according to API581 standard, given a mark by management level of the expert graded to full factory, obtain management comment
Estimate score.
3. a kind of method for determining the unit check period according to equipment Risk grade according to claim 1, feature exist
According to the risk class of API581 criterion calculation equipment all parts to be checked, obtaining equipment all parts to be checked in the S1
Failure probability grade be 1 or 2 or 3 or 4 or 5 and the failure consequence of equipment all parts to be checked is A or B or C or D,
Or E.
4. a kind of method for determining the unit check period according to equipment Risk grade according to claim 3, feature exist
In when the failure probability grade of i-th of component is 1, failure probability correction factor is 0.5；When the failure of i-th of component is general
When rate grade is 2, failure probability correction factor is 0.6；When the failure probability grade of i-th of component is 3, failure probability
Correction factor is 0.7；When the failure probability grade of i-th of component is 4, failure probability correction factor is 0.8；When i-th
When the failure probability grade of component is 5, failure probability correction factor is 0.9；
When the failure consequence grade of i-th of component is A, failure consequence correction factor is 0.5；When the failure of i-th of component
When consequence grade is B, failure consequence correction factor is 0.6；When the failure consequence grade of i-th of component is C, after failure
Fruit correction factor is 0.7；When the failure consequence grade of i-th of component is D, failure consequence correction factor is 0.8；When i-th
When the failure consequence grade of a component is E, failure consequence correction factor is 0.9；
When management assessment is scored at 401~500, management correction factor is 0.4；When management assessment is scored at 501~600,
Managing correction factor is 0.5；When management assessment is scored at 601~700, management correction factor is 0.6；When management assessment score
When being 701~800, management correction factor is 0.7；When management assessment is scored at 801~900, management correction factor is 0.8；
When management assessment is scored at 901~1000, management correction factor is 0.9.
5. a kind of method for determining the unit check period according to equipment Risk grade according to claim 1, feature exist
In, in the S1, according to API581 standard determine equipment to be checked stress corrosion cracking or high temperature hydrogen susceptibility to damage be "high",
" in " or " low ".
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| CN112749467A (en) * | 2019-10-30 | 2021-05-04 | 中国石油化工股份有限公司 | Memory, process pipeline detection period evaluation method, device and equipment |
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