CN104406751A - System for testing high-temperature pipeline flange under action of outer bending moment - Google Patents
System for testing high-temperature pipeline flange under action of outer bending moment Download PDFInfo
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- CN104406751A CN104406751A CN201410706322.8A CN201410706322A CN104406751A CN 104406751 A CN104406751 A CN 104406751A CN 201410706322 A CN201410706322 A CN 201410706322A CN 104406751 A CN104406751 A CN 104406751A
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Abstract
The invention discloses a system for testing a high-temperature pipeline flange under the action of outer bending moment. The system comprises a left pipeline, a right pipeline, a flange as well as an outer bending moment loading mechanism and a stress testing mechanism, wherein the flange is used for connecting the left pipeline and the right pipeline; the flange is sealed by using a gasket; the left pipeline, the right pipeline and the flange form a flange to-be-tested cavity; the left pipeline is connected with a pump through a valve; the right pipeline is welded to a blind plate; a temperature sensor, a pressure sensor and an electric heating device are arranged inside the flange to-be-tested cavity; a flange leakage testing mechanism is arranged outside the flange; the flange leakage testing mechanism comprises a leakage testing cavity formed by a leakage testing wall in a surrounding manner; an exhaust valve and a bottom flow hole valve are arranged on the leakage testing wall; another temperature sensor and another pressure sensor are arranged inside the leakage testing cavity. The system is accurate in stress testing, high in leakage testing accuracy rate, and relatively high in guiding significance on both scientific research and engineering.
Description
Technical field
The present invention relates to a set of flange test macro, be specifically related to high-temperature pipe flange test macro under a kind of Moments effect.
Background technology
Flange joint is connected mode conventional in petrochemical equipment, because it has the advantage being easy to remove and install, in the pressure vessel being widely used in the industries such as petrochemical industry, nuclear power, metallurgy, pharmacy and pipeline.Along with the contradiction of economic development and energy supply, oil refining and Chemical Engineering Technology develop rapidly, ubiquity high temperature and high pressure condition in various refinery device.Under high-temperature operation condition, the changes such as flange may deflect, warpage, creep, Crack Extension, flange each several part STRESS VARIATION is complicated; When there being Moments effect, flange each several part stress characteristics also can great changes have taken place, and deflection, warpage, crackle may aggravate to leak.It is the one of the main reasons that major accident occurs in the enterprises such as petrochemical complex that high-temperature flange leaks.Therefore, we are necessary to design high-temperature pipe flange test macro under a kind of Moments effect and analyze, to ensure the security that pipeline connects complicated stress on the slip of high-temperature flange under Moment outside and flange.
Summary of the invention
The object of the present invention is to provide high-temperature pipe flange test macro under a kind of Moments effect, described test macro is applied to the high-temperature flange under Moments effect, accurately can test stress and the flange leakage of flange outer wall, ensures to produce, the carrying out smoothly of construction.
The present invention is achieved in that high-temperature pipe flange test macro under a kind of Moments effect, it comprises left pipeline, right pipeline, and connecting the flange of left pipeline and right pipeline, described flange adopts pad to seal, and left pipeline, right pipeline, flange form flange cavity to be measured;
Described left pipeline is connected with pump by valve, and described right pipeline welds with blind plate; Be provided with in described flange cavity to be measured temperature sensor, pressure transducer, by electric heater electricity cabinet control electric heater unit;
Described flange is outside equipped with flange leakage mechanism for testing, described flange leakage mechanism for testing comprises the cavity that leaks hunting surrounded by the wall that leaks hunting, the described wall that leaks hunting is provided with drain tap, underflow opening valve, described drain tap, underflow opening valve also can be used for being filled with medium, described in leak hunting in cavity and be provided with temperature sensor, pressure transducer;
Described system also comprises Moments load maintainer and stress test mechanism, described Moments load maintainer comprises hydraulic loading device, described hydraulic loading device applies power to left and right pipeline, the pipeline of flange connections forms moment of face, the large I free adjustment of moment, described stress test mechanism comprises foil gauge, and foil gauge is connected with strainmeter and computing machine by winding displacement.
Described foil gauge is evenly distributed on left pipeline cylindrical section, right pipeline cylindrical section, flange cone cervical part of esophagus and ring flange outer wall.
Under the effect of this Moments in high-temperature pipe flange test macro, the left end of flange cavity to be measured is provided with a pump, the export pipeline of pump has a valve, export pipeline is directly connected with left pipeline, with pump by medium transport in flange cavity to be measured, and pressure transducer and temperature sensor being set in flange cavity to be measured, the temperature of medium in this temperature sensor monitors flange cavity to be measured, the pressure in flange cavity to be measured measured by this pressure transducer; The below of pipeline is provided with supporting bracket, is provided with drain tap above pipeline; Flange adopts bolt to connect, and seals with pad; The middle part of described flange cavity to be measured is provided with an electric heater unit, can heat medium in flange cavity to be measured.
Described Moments load maintainer is formed primarily of liquid crystal control panels, hydraulic loading device, loading support and loading arm; Described hydraulic loading device can be controlled by liquid crystal control panels, and the needs according to test come reasonably to load, and namely can provide and be loaded into from zero the load value wanted arbitrarily in range.The extension bar loading support and hydraulic loading device is welded as a whole.Described hydraulic loading device can provide the power of arbitrary size in range, described loading support is provided with loading arm, and loading arm can move left and right, with the bearing acting in conjunction under pipeline on loading support, there is provided dissimilar moment of flexure, described loading arm and left pipeline, right tube contacts.
Described flange leakage mechanism for testing is primarily of the cavity that leaks hunting, temperature sensor, pressure transducer composition; The described cavity that leaks hunting is provided with the valve of input measurement medium, conveniently uses when needs are filled with measurement medium; The described cavity that leaks hunting is provided with vent port and underflow opening; Described flange stress mechanism for testing mainly comprises foil gauge, strainmeter, and described foil gauge is evenly distributed on pipeline cylindrical section, flange cone cervical part of esophagus and ring flange outer wall; The change in electric of described foil gauge is sent in strainmeter and computing machine by winding displacement.
Under the effect of this Moments, high-temperature pipe flange test macro forms primarily of pipe flange bindiny mechanism (pipe flange bindiny mechanism is made up of pump, pipeline, flange, blind plate etc.), dielectric heating mechanism, Moments load maintainer and stress test mechanism, pump manufactures hyperbaric environment in flange cavity to be measured, the middle part of flange cavity to be measured is provided with an electric heater unit, by dielectric heating in cavity to be measured for flange to assigned temperature, temperature, pressure transducer measure temperature, the pressure of flange cavity to be measured.The upper any power applied in hydraulic loading device range of the pipeline (left pipeline, right pipeline) of described Moments load maintainer at flange two ends, this power forms moment of flexure, the size of control and the size of control moment in conjunction with the bearing below pipeline.
The present invention utilizes pump or air compressor to provide hyperbaric environment for pipe flange bindiny mechanism, electric heater unit is utilized to provide hot environment for pipe flange, the test in many group temperature and pressure situations can be done, can measure flange be connected to high-temperature and high-pressure conditions bear Moments effect under slip.The present invention is applicable to liquid medium and gas medium.The present invention can not only check out whether Flange joint leaks, measures slip, and can accurately testing conduit cylindrical section, cone cervical part of esophagus and ring flange outer wall on stress, stress level on flange under Real-Time Monitoring different pressures, temperature conditions, has judged whether underbead crack and Crack Extension situation.Stress determination of the present invention is accurate, and leak tested accuracy rate is high, all has stronger directive significance to scientific research and engineering.
Accompanying drawing explanation
Fig. 1 is the structural representation of high-temperature pipe flange test macro under the effect of this Moments.
Fig. 2 is the enlarged drawing of A in Fig. 1.
In figure: 1-pump, 2-valve, 3-vent valve, the left pipeline of 4-, 5-electric heater unit, 6-flange, 7-liquid crystal control panels, 8-loads support, 9-leaks hunting cavity, 10-drain tap, 11-hydraulic loading device, 12-pad, the right pipeline of 13-, 14-blind plate, 15-electric heater electricity cabinet, 16-right support abutment, 17-underflow opening valve, 19-underflow opening valve, 20-temperature sensor, 21-pressure transducer, 22-left support abutment, 23-temperature sensor, 24-pressure transducer, 25-computing machine, 26-strainmeter, 27-foil gauge, 28-loading arm.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further.
As shown in Figure 1 and Figure 2, high-temperature pipe flange test macro under a kind of Moments effect, it comprises left pipeline 4, right pipeline 13, and connect the flange 6 of left pipeline 4 and right pipeline 13, described flange 6 is connected by bolt, and adopts pad 12 to seal, and left pipeline 4, right pipeline 13, flange 6 form flange cavity to be measured, described left pipeline 4 is provided with vent valve 3, and described right pipeline 13 is provided with underflow opening valve 17;
Described left pipeline 4 is connected with pump 1 by valve 2, and described right pipeline 13 welds with blind plate 14; Be provided with in described flange cavity to be measured temperature sensor 23, pressure transducer 24, by electric heater electricity cabinet 15 control electric heater unit 5, the temperature of medium in flange cavity to be measured monitored by this temperature sensor 23, the pressure in flange cavity to be measured measured by this pressure transducer 24, and this electric heater unit 5 can heat medium in flange cavity to be measured;
Described flange 6 is outside equipped with flange leakage mechanism for testing, described flange leakage mechanism for testing comprises the cavity 9 that leaks hunting surrounded by the wall that leaks hunting, the described wall that leaks hunting is provided with drain tap 10, underflow opening valve 19, drain tap 10, underflow opening valve 19 not only can be vented, and can be used for input or get rid of medium; Be provided with temperature sensor 20, pressure transducer 21 in the described cavity 9 that leaks hunting, temperature sensor 20, pressure transducer 21 can measure the temperature and pressure of cavity 9 medium of leaking hunting;
Described system also comprises Moments load maintainer and stress test mechanism, described Moments load maintainer comprises the hydraulic loading device 11 controlled by liquid crystal control panels 7, the extension bar of described hydraulic loading device 11 connects as one with loading support 8, described loading support 8 is provided with loading arm 28, described hydraulic loading device 11 can provide the power of arbitrary size in range, described loading arm 28 and left pipeline 4, right pipeline 13 contacts, loading arm 28 can move left and right on loading support 8, with right support abutment 16, left support abutment 22 acting in conjunction, there is provided dissimilar, the moment of flexure of different size, described stress test mechanism comprises foil gauge 27, computing machine 25 and strainmeter 26, described foil gauge 27 is evenly distributed on left pipeline cylindrical section, right pipeline cylindrical section, flange cone cervical part of esophagus and ring flange outer wall, described foil gauge is circumferentially uniformly distributed, and described foil gauge 27 is connected with strainmeter 26 and computing machine 25 by winding displacement.
In order to ensure the accuracy measured, described left pipeline 4 is provided with left support abutment 22, and described right pipeline 13 is provided with right support abutment 16.
Described loading arm 28 can move left and right outside to left support abutment 22, right support abutment 16 on loading support 8, loads dissimilar moment of flexure.Described loading arm 28 is symmetrical or asymmetric, can provide dissimilar moment of flexure.
Described pump 1, for being transported in flange cavity to be measured by medium (liquid or gas), forms hyperbaric environment in flange cavity to be measured, and the pipeline of flange cavity to be measured is provided with valve 3, for exhaust when being filled with medium in flange cavity to be measured; Described electric heater 5 is for rising to a certain temperature by medium temperature, and the heating dynamics of electric heater 5 controls by electric heater electricity cabinet 15.Temperature sensor 23 and pressure transducer 24 is provided with, temperature, the pressure of Real-Time Monitoring flange cavity medium to be measured in flange cavity to be measured.Blind plate 14 is welded on right pipe end, its good sealing effect, and electric heater unit 5 is installed and ensured good seal.
Outside flange 6, be arranged with the cavity 9 that leaks hunting, the pressure of cavity 9 medium of leaking hunting can be affected after leaking out during medium is by flange cavity to be measured, thus reflect mass change or the volume change of cavity medium of leaking hunting; Be provided with temperature sensor 20 and pressure transducer 21 in the described cavity 9 that leaks hunting, the temperature and pressure of cavity 9 medium of leaking hunting can be measured; The described cavity 9 that leaks hunting is provided with drain tap 10, underflow opening valve 19, and underflow opening valve 19 is for being filled with medium, and when being filled with medium and being liquid medium, drain tap 10 can be vented, and underflow opening valve 19 to leak hunting cavity 9 medium for pressure release or eliminating; The volume of cavity 9 of leaking hunting can utilize drain tap 10, underflow opening valve 19 to be measured the volume of the cavity that leaks hunting by drainage.
A hydraulic loading device 11 is fixed with above the pipeline of flange cavity to be measured, hydraulic loading device 11 applies moment of flexure by the pipeline (left pipeline, right pipeline) at the loading support 8 pairs of flange two ends welded together with its extension bar, the liquid crystal control panels 7 that hydraulic loading device 11 can be carried by it controls, and applies the load in any range; Described loading support is provided with loading arm, described loading arm and left pipeline, right tube contacts; Loading arm can move left and right on loading support, and bearing (left support abutment, the right support abutment) acting in conjunction on loading arm and pipeline, provides dissimilar moment of flexure.
As shown in Figure 2, outer wall along ring flange, cone neck, left pipeline and right pipeline evenly posts foil gauge 27, the change of foil gauge 27 power on signal is delivered to strainmeter 26 by wire (winding displacement), foil gauge 27 measures the stress at each position on flange, and in strainmeter 26 and computing machine 25, show in real time strain, slip, stress and rule over time thereof.
Signal can be delivered in computing machine 25 and show by temperature sensor 20, pressure transducer 21, temperature sensor 23 and pressure transducer 24, also can be delivered in single-chip microcomputer and show.
Work process of the present invention:
(1) under Moments effect before the work of high-temperature pipe flange test macro, computing machine 25 is started shooting stand-by, and strainmeter 26 is started shooting preheating, check valve 2, vent valve 3, underflow opening valve 17, drain tap 10, underflow opening valve 19 on off state; If medium is liquid in flange cavity to be measured, is then filled with identical testing liquid under original state in the cavity that leaks hunting, and records initial working temperature and pressure; If be gaseous medium in flange cavity to be measured, be then filled with identical gas to be measured under original state in the cavity that leaks hunting, and record initial working temperature and pressure, simultaneously hydraulic loading device 11 hot standby;
(2), when under Moments effect, high-temperature pipe flange test macro works, medium is filled with flange cavity to be measured by pump 1, shows flange empty cavity pressure to be measured, pressure is adjusted to testing pressure by pressure transducer 24; Open electric heater unit 5, flange empty cavity temperature to be measured is shown by means of temperature sensor 23, medium temperature is adjusted to and treats testing temperature, under this worst hot case, the pressurize sufficiently long time, measured in real time by computing machine 25 pairs of slips, jointly monitored the STRESS VARIATION on flange by strainmeter 26 and computing machine 25.
Under worst hot case (temperature and pressure to be measured), the pressurize sufficiently long time, leak hunting data that the temperature sensor 20 of cavity 9 and pressure transducer 21 record if do not met the temperature volume Changing Pattern of equation of gaseous state or liquid, if namely flange cavity interior conduit to be measured pressure transducer 24 registration diminishes in the process, pressure transducer 21 registration of leaking hunting in cavity becomes large, then can judge to leak.When judging flange leakage to be measured, calculating slip can be carried out as follows.In addition, the STRESS VARIATION on flange to be measured is jointly monitored by strainmeter 26 and computing machine 25.
Particularly, slip can pass through following formulae discovery:
When leaking medium is gas, the gaseous mass of leaking hunting in cavity is:
At the end of leaking hunting:
Wherein: the volume of the cavity that leaks hunting is V, and in measuring intervals of TIME t, the pressure and temperature leaked hunting in cavity is by p
1, T
1become p
2, T
2, M is medium molecule quality, and R is gaseous state constant, m
1for initial state quality, m
2for final states quality.
Gaseous mass change in time interval t is as follows:
Wherein Δ m is of poor quality.
The volumetric leak rate of the gas leaked is:
Wherein Δ V is volume differences, and L is volume change.
Can directly calculate with formula (4) if medium is liquid.
Here be adopt volume change to represent slip, mass change can certainly be adopted to represent slip, and namely Δ m/t, repeats no more here.
The present invention can not only check out whether flange leaks, and the data by testing draw mass change or the volume change of medium.
Claims (7)
1. high-temperature pipe flange test macro under a Moments effect, it comprises left pipeline, right pipeline, and connects the flange of left pipeline and right pipeline, and described flange adopts pad to seal, left pipeline, right pipeline, flange form flange cavity to be measured, it is characterized in that:
Described left pipeline is connected with pump by valve, and described right pipeline welds with blind plate; Be provided with in described flange cavity to be measured temperature sensor, pressure transducer, by electric heater electricity cabinet control electric heater unit;
Described flange is outside equipped with flange leakage mechanism for testing, and described flange leakage mechanism for testing comprises the cavity that leaks hunting surrounded by the wall that leaks hunting, described in the wall that leaks hunting be provided with drain tap, underflow opening valve, described in leak hunting in cavity and be provided with temperature sensor, pressure transducer;
Described system also comprises Moments load maintainer and stress test mechanism, described Moments load maintainer comprises hydraulic loading device, described hydraulic loading device left pipeline and right pipeline applies power, with bearing acting in conjunction, the pipeline of flange connections forms moment of face, moment size energy free adjustment, described stress test mechanism comprises foil gauge, and foil gauge is connected with strainmeter and computing machine by winding displacement.
2. high-temperature pipe flange test macro under Moments effect as claimed in claim 1, it is characterized in that: the extension bar of described hydraulic loading device is integrated with loading support welding, described hydraulic loading device can provide the power of arbitrary size in range, described loading support is provided with loading arm, described loading arm and left pipeline, right tube contacts.
3. high-temperature pipe flange test macro under Moments effect as claimed in claim 2, is characterized in that: described hydraulic loading device is controlled by liquid crystal control panels.
4. high-temperature pipe flange test macro under Moments effect as claimed in claim 2, it is characterized in that: described loading arm can move left and right on loading support, and the bearing acting in conjunction on this loading arm and left and right pipeline, provide dissimilar, the moment of flexure of size.
5. high-temperature pipe flange test macro under Moments effect as claimed in claim 1, is characterized in that: described foil gauge is evenly distributed on left pipeline cylindrical section, right pipeline cylindrical section, flange cone cervical part of esophagus and ring flange outer wall.
6. high-temperature pipe flange test macro under Moments effect as claimed in claim 5, is characterized in that: described foil gauge is uniformly distributed circumferentially.
7. high-temperature pipe flange test macro under Moments effect as claimed in claim 1, it is characterized in that: described left pipeline is provided with vent valve, described right pipeline is provided with underflow opening valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410706322.8A CN104406751A (en) | 2014-11-28 | 2014-11-28 | System for testing high-temperature pipeline flange under action of outer bending moment |
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| CN201410706322.8A CN104406751A (en) | 2014-11-28 | 2014-11-28 | System for testing high-temperature pipeline flange under action of outer bending moment |
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| CN105181267A (en) * | 2015-07-17 | 2015-12-23 | 武汉工程大学 | Device for testing leakage rate of bolted flange connection system |
| CN105423018A (en) * | 2016-01-08 | 2016-03-23 | 武汉工程大学 | Leakage detecting device of high-temperature flange connecting system |
| CN106764458A (en) * | 2016-12-28 | 2017-05-31 | 核动力运行研究所 | Flange leakage monitoring device and high energy pipe network flange leakage monitoring regulator control system |
| CN109827726A (en) * | 2019-01-18 | 2019-05-31 | 西北工业大学 | The multi-state performance testing device and system of hydraulic line system |
| CN110361147A (en) * | 2019-07-15 | 2019-10-22 | 张超 | A kind of oil-gas pipeline leakage detection method and device |
| CN111141459A (en) * | 2020-01-14 | 2020-05-12 | 中国石油大学(北京) | Test device for simulating sealing performance of flange gasket under coupling working condition |
| CN111896239A (en) * | 2020-06-16 | 2020-11-06 | 合肥通用机械研究院有限公司 | Valve end connection fire resistance test system and test method |
| CN113848135A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | Method for circularly applying load to deep sea pipeline |
| CN114636523A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Carrier gas bin testing device for hydrogen conveying pipeline |
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| CN105181267B (en) * | 2015-07-17 | 2018-06-08 | 武汉工程大学 | For testing the device of Bolted Flanged Connection system leak rate |
| CN105423018A (en) * | 2016-01-08 | 2016-03-23 | 武汉工程大学 | Leakage detecting device of high-temperature flange connecting system |
| CN105423018B (en) * | 2016-01-08 | 2018-12-14 | 武汉工程大学 | The leak-checking apparatus of Flanged Joints at Elevated Temperature |
| CN106764458A (en) * | 2016-12-28 | 2017-05-31 | 核动力运行研究所 | Flange leakage monitoring device and high energy pipe network flange leakage monitoring regulator control system |
| CN109827726A (en) * | 2019-01-18 | 2019-05-31 | 西北工业大学 | The multi-state performance testing device and system of hydraulic line system |
| CN110361147A (en) * | 2019-07-15 | 2019-10-22 | 张超 | A kind of oil-gas pipeline leakage detection method and device |
| CN111141459A (en) * | 2020-01-14 | 2020-05-12 | 中国石油大学(北京) | Test device for simulating sealing performance of flange gasket under coupling working condition |
| CN111141459B (en) * | 2020-01-14 | 2021-06-01 | 中国石油大学(北京) | Test device for simulating sealing performance of flange gasket under coupling working condition |
| CN111896239A (en) * | 2020-06-16 | 2020-11-06 | 合肥通用机械研究院有限公司 | Valve end connection fire resistance test system and test method |
| CN113848135A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | Method for circularly applying load to deep sea pipeline |
| CN114636523A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Carrier gas bin testing device for hydrogen conveying pipeline |
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Application publication date: 20150311 |
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