WO2003058160A1 - Method for measuring the pipeline creeping - Google Patents
Method for measuring the pipeline creeping Download PDFInfo
- Publication number
- WO2003058160A1 WO2003058160A1 PCT/PL2002/000010 PL0200010W WO03058160A1 WO 2003058160 A1 WO2003058160 A1 WO 2003058160A1 PL 0200010 W PL0200010 W PL 0200010W WO 03058160 A1 WO03058160 A1 WO 03058160A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipeline
- measuring
- sensor
- creeping
- sensors
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
Definitions
- the subject of the invention is the measuring method for the creeping deformation of pipelines operated at high temperatures and pressures.
- a method for making the readings of strain gauge measuring converters independently from temperature measurements, and said method consists in the surface of membrane, which the strain gauges are glued onto, covered with a material of greasy consistency, which characteristic for its good thermal conductivity is. A layer of machine grease is use with advantage for that purpose.
- a measuring circuit for the pipeline creeping deformation is known, which comprises measuring pins fixed on the pipeline outer surface. At least one pair of pins is durably fixed to the pipeline outer surface for measuring of the pipelines creeping deformation in the plane perpendicular to the pipeline axis. Each pin consists of a lower part durably connected with an upper part, which includes a measuring surface.
- the pins are so located in relation to each other, that the axes of the lower parts create an acute angle, whereas the measuring surfaces of the upper parts are parallel to each other.
- a method and a strain gauge circuit for the measuring of residual stresses in mechanical structures, in particular in steam pipelines is known.
- four resistive strain gauges are used, which are located radially in relation to the centre of the opening in the object tested, and their axes are consistent with the deformation measurement direction.
- the measuring methods described above are useful for stress measurements, however they are not useful for creeping deformation measurements. They are neither useful for creeping deforsmation measurements in the circumferential direction in large areas and on straight lengths, where the pipeline creeping is small.
- the invention makes it possible to obtain both the mentioned results together.
- the invention's method which consists in that: a strain gauge sensor with a precisely known measurement response, which means a determined change of resistance in relation to the temperature change and time, is fixed durably and on an intermediate layer on the pipeline outer surface, and next to that measuring sensor, an identical control sensor is mounted on a plate made of the pipeline's material, and the plate freely contacts the pipeline, IS DISTINGUISHED for the use of sensors, which had been previously seasoned in the pipeline operating conditions until the stabilisation of their resistance, or those sensors had been stabilised in the same conditions on the pipeline tested, but before the measurement.
- the sensors are seasoned over 1,000 hours long, in particular over 1,5000 hours.
- the sensors are durably fixed using a spot welder.
- strain gauge sensors consist in the stabilising of their resistance changes in particular in extreme conditions, which makes it possible with time to measure the creeping deformation at small pipeline lengths, at radiuses and curvatures, where a concentration of deformation occurs. Additionally, a higher accuracy of the creeping deformation measurements and a possibility of a quicker and easier recording thereofare obtained.
- the method according to the invention was illustrated for a better understanding based on the illustration, which presents a fragment of the pipeline with a strain gauge measuring sensor attached, beside which a control strain gauge sensor is attached on a plate, which freely contacts the pipeline surface.
- a strain gauge measuring sensor 3 of a determined temperature profile is durably fixed on a metal foil.
- a strain gauge control sensor 4 is located.
- the strain gauge control sensor 4 ⁇ not loaded with the operation parameters of the pipeline 2 is durably fixed on the plate 5, which of the same material as the pipeline 2 manufactured is.
- the plate 5 is located on the pipeline 2, so that it freely touches the outer surface 1 of the pipeline 2.
- the number of strain gauge measuring sensors 3 fixed on the pipeline 2 may be between one and a dozen or so, or even more, with one strain gauge control sensor 4 fixed next to them.
- This method is suitable for a continuous monitoring and a creeping deformation measuring for equipment of very high requirements such as steam pipelines operating at varying temperatures at level of 500°C and more and at high pressures.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Pipeline Systems (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The measuring method for the creeping deformation of pipelines operated at high pressures and high temperatures, in particular over 500 °C, is distinguished for that: the straing gauge sensors, located on the pipeline surface before the measurement commences, are seasoned at the measuring conditions until their resistance is stabilised, in particular for 1,000 hours and more.
Description
Method for measuring the pipeline creeping.
The subject of the invention is the measuring method for the creeping deformation of pipelines operated at high temperatures and pressures.
From the Polish patent specification No 137244, a method is known for making the readings of strain gauge measuring converters independently from temperature measurements, and said method consists in the surface of membrane, which the strain gauges are glued onto, covered with a material of greasy consistency, which characteristic for its good thermal conductivity is. A layer of machine grease is use with advantage for that purpose. Also from the Polish patent specification No 170633, a measuring circuit for the pipeline creeping deformation is known, which comprises measuring pins fixed on the pipeline outer surface. At least one pair of pins is durably fixed to the pipeline outer surface for measuring of the pipelines creeping deformation in the plane perpendicular to the pipeline axis. Each pin consists of a lower part durably connected with an upper part, which includes a measuring surface. The pins are so located in relation to each other, that the axes of the lower parts create an acute angle, whereas the measuring surfaces of the upper parts are parallel to each other. Besides, from the specification of the Polish patent application No P-327116 a method and a strain gauge circuit for the measuring of residual stresses in mechanical structures, in particular in steam pipelines, is known. In this method, four resistive strain gauges are used, which are located radially in relation to the centre of the opening in the object tested, and their axes are consistent with the deformation measurement direction.
The measuring methods described above are useful for stress measurements, however they are not useful for creeping deformation measurements. They are neither useful for creeping deforsmation measurements in the circumferential direction in large areas and on straight lengths, where the pipeline creeping is small.
The invention makes it possible to obtain both the mentioned results together.
The invention's method, which consists in that: a strain gauge sensor with a precisely known measurement response, which means a determined change of resistance in relation to the temperature change and time, is fixed durably and on an intermediate layer on the pipeline outer surface, and next to that measuring sensor, an identical control sensor is mounted on a plate made of the pipeline's material, and the plate freely contacts the pipeline, IS DISTINGUISHED for the use of sensors, which had been previously seasoned in the pipeline operating conditions until the stabilisation of their resistance, or those sensors had been stabilised in the same conditions on the pipeline tested, but before the measurement.
According to one of the invention realisation forms, the sensors are seasoned over 1,000 hours long, in particular over 1,5000 hours.
According to an advantageous form of the invention realisation, the sensors are durably fixed using a spot welder.
The invention's procedure using unknown features of strain gauge sensors, which consist in the stabilising of their resistance changes in particular in extreme conditions, which makes it possible with time to measure the creeping deformation at small pipeline lengths, at radiuses and curvatures, where a concentration of deformation occurs. Additionally, a higher accuracy of the creeping deformation measurements and a possibility of a quicker and easier recording thereofare obtained.
Example.
Tests of creeping deformation and calculations of creeping velocity were made. The pipeline was loaded with a „fresh" steam of 530°C temperature and 13Mpa pressure. It appeared during the initial tests, that the creeping deformation and velocity could not be measured. At constant temperature and load, the sensors varied their resistance, and resistances, which resulted from the creeping deformation, were significantly exceeded. After approximately 1,500 hours of the sensors' operation on the pipeline, a temperature stabilisation followed. After that time, measuring of the creeping deformation started. As a result thereof, the pipeline load due to deformation at the measuring area was small. A small creeping deformation was caused. Considering that fact, the measuring of the pipeline creeping deformation was carried out for 3,600 hours. The maximum measured pipeline deformation was ε=97,147*10" , which was caused by the creeping velocity of
o
2,698*10" [1/godz.j. The test results proved, that the presented method for deformation measurement is fully useful; the maximum measuring error is approximately 5%.
The method according to the invention was illustrated for a better understanding based on the illustration, which presents a fragment of the pipeline with a strain gauge measuring sensor attached, beside which a control strain gauge sensor is attached on a plate, which freely contacts the pipeline surface.
On the outer surface I of the pipeline 2, at the deformation measuring area, a strain gauge measuring sensor 3 of a determined temperature profile is durably fixed on a metal foil. Next to the strain gauge measuring sensor 3, which loaded with the operation parameters of the pipeline 2 is, a strain gauge control sensor 4 is located. The strain gauge control sensor 4^ not loaded with the operation parameters of the pipeline 2, is durably fixed on the plate 5, which of the same material as the pipeline 2 manufactured is. The plate 5 is located on the pipeline 2, so that it freely touches the outer surface 1 of the pipeline 2. During the measuring of the creeping deformation, in case the temperature of the pipeline 2 varies, the strain gauge control sensor 4 carries out a correction of the deformation measured with the strain gauge measuring sensor 3. Depending on needs, the number of strain gauge measuring sensors 3 fixed on the pipeline 2 may be between one and a dozen or so, or even more, with one strain gauge control sensor 4 fixed next to them. This method is suitable for a continuous monitoring and a creeping deformation measuring for equipment of very high requirements such as steam pipelines operating at varying temperatures at level of 500°C and more and at high pressures.
Claims
1. The method for pipeline creeping measurements by means of a strain gauge measuring sensor, which is durably fixed on an intermediate layer on the pipeline outer surface, and said measuring sensor has an accurately determined measuring response, which means a determined resistance change with time and in relation to temperature, and, besides said measuring sensor, by means of a control sensor identical to said measuring sensor, and said control sensor is fixed on a plate of the same material as the pipeline, and said plate freely touches the pipeline, which is distinguished for that: sensors are used, which were previously seasoned in the pipeline operation conditions until their resistance stabilised, or those sensors were stabilised in the same conditions, but directly on the pipeline to be measured, before the measuring commences.
2. The method ace. to claim 1, is distinguished for that: the sensors are seasoned more than 1,000 hours, in particular approximately until 1,500 hours.
3. The method ace. to claim 1, is distinguished for that: as the intermediate layer, a metal foil is used, which was previously shaped together with the sensor ace. to shape of the measuring area.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2002228515A AU2002228515A1 (en) | 2002-01-13 | 2002-01-13 | Method for measuring the pipeline creeping |
| PCT/PL2002/000010 WO2003058160A1 (en) | 2002-01-13 | 2002-01-13 | Method for measuring the pipeline creeping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/PL2002/000010 WO2003058160A1 (en) | 2002-01-13 | 2002-01-13 | Method for measuring the pipeline creeping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003058160A1 true WO2003058160A1 (en) | 2003-07-17 |
Family
ID=19936056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/PL2002/000010 WO2003058160A1 (en) | 2002-01-13 | 2002-01-13 | Method for measuring the pipeline creeping |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU2002228515A1 (en) |
| WO (1) | WO2003058160A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2923522A1 (en) * | 2007-11-13 | 2009-05-15 | Technip France Sa | Deformable submarine flowline's movement measuring device, has rods that are successively separated by one flowline and one support when two flowlines are driven in movement along path to measure amplitude of measurement of flowlines |
| CN104792258A (en) * | 2015-04-23 | 2015-07-22 | 华北电力大学 | Gas-insulated metal-enclosed power transmission line monitoring method and device |
| CN107449625A (en) * | 2017-08-16 | 2017-12-08 | 天津大学 | A kind of pipeline axial orientation racking test device for considering sea bed inclination angle and falling temperature gradient |
| CN107462432A (en) * | 2017-08-16 | 2017-12-12 | 天津大学 | A kind of experimental rig for considering steel catenary riser tension force effect underground pipelines axial orientation displacement |
| CN108413862A (en) * | 2018-04-10 | 2018-08-17 | 北京交通大学 | A kind of test method of directly buried heat distribution pipeline road deformation |
| CN111504533A (en) * | 2020-05-09 | 2020-08-07 | 核工业井巷建设集团有限公司 | Stress monitoring device and method for key positions of head and pipeline of push bench |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1032220A (en) * | 1964-03-25 | 1966-06-08 | Zd Elektroizmeritelnykh Pribor | Method of manufacture of material for electrical resistors |
| US4012953A (en) * | 1976-03-18 | 1977-03-22 | Ormond Alfred N | Short term creep compensation for load cells |
| JPS5643523A (en) * | 1979-09-19 | 1981-04-22 | Ee & D:Kk | Preparation of load cell |
| US4511877A (en) * | 1982-02-18 | 1985-04-16 | Tokyo Electric Co., Ltd. | Strain gauge with reduced creep phenomenon by improved insulation layering |
| US4543837A (en) * | 1984-04-25 | 1985-10-01 | Allegany Technology, Inc. | Load cell temperature compensation system |
| US5031463A (en) * | 1990-03-20 | 1991-07-16 | Sensortronics, Inc. | Load cell output correction circuitry |
-
2002
- 2002-01-13 WO PCT/PL2002/000010 patent/WO2003058160A1/en not_active Application Discontinuation
- 2002-01-13 AU AU2002228515A patent/AU2002228515A1/en not_active Abandoned
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1032220A (en) * | 1964-03-25 | 1966-06-08 | Zd Elektroizmeritelnykh Pribor | Method of manufacture of material for electrical resistors |
| US4012953A (en) * | 1976-03-18 | 1977-03-22 | Ormond Alfred N | Short term creep compensation for load cells |
| JPS5643523A (en) * | 1979-09-19 | 1981-04-22 | Ee & D:Kk | Preparation of load cell |
| US4511877A (en) * | 1982-02-18 | 1985-04-16 | Tokyo Electric Co., Ltd. | Strain gauge with reduced creep phenomenon by improved insulation layering |
| US4543837A (en) * | 1984-04-25 | 1985-10-01 | Allegany Technology, Inc. | Load cell temperature compensation system |
| US5031463A (en) * | 1990-03-20 | 1991-07-16 | Sensortronics, Inc. | Load cell output correction circuitry |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 005, no. 100 (P - 068) 27 June 1981 (1981-06-27) * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2923522A1 (en) * | 2007-11-13 | 2009-05-15 | Technip France Sa | Deformable submarine flowline's movement measuring device, has rods that are successively separated by one flowline and one support when two flowlines are driven in movement along path to measure amplitude of measurement of flowlines |
| WO2009092908A2 (en) * | 2007-11-13 | 2009-07-30 | Technip France | Device for measuring the movement of a subsea deformable pipeline |
| WO2009092908A3 (en) * | 2007-11-13 | 2009-09-17 | Technip France | Device for measuring the movement of a subsea deformable pipeline |
| US8286516B2 (en) | 2007-11-13 | 2012-10-16 | Technip France | Device for measuring the movement of a subsea deformable pipeline |
| AU2008348671B2 (en) * | 2007-11-13 | 2015-04-23 | Technip France | Device for measuring the movement of a subsea deformable pipeline |
| CN104792258A (en) * | 2015-04-23 | 2015-07-22 | 华北电力大学 | Gas-insulated metal-enclosed power transmission line monitoring method and device |
| CN107449625A (en) * | 2017-08-16 | 2017-12-08 | 天津大学 | A kind of pipeline axial orientation racking test device for considering sea bed inclination angle and falling temperature gradient |
| CN107462432A (en) * | 2017-08-16 | 2017-12-12 | 天津大学 | A kind of experimental rig for considering steel catenary riser tension force effect underground pipelines axial orientation displacement |
| CN107449625B (en) * | 2017-08-16 | 2019-10-11 | 天津大学 | Consider the pipeline axial orientation racking test device of sea bed inclination angle and falling temperature gradient |
| CN107462432B (en) * | 2017-08-16 | 2019-12-24 | 天津大学 | Test device for axial directional displacement of tube spool under action of tension of steel catenary riser |
| CN108413862A (en) * | 2018-04-10 | 2018-08-17 | 北京交通大学 | A kind of test method of directly buried heat distribution pipeline road deformation |
| CN111504533A (en) * | 2020-05-09 | 2020-08-07 | 核工业井巷建设集团有限公司 | Stress monitoring device and method for key positions of head and pipeline of push bench |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002228515A1 (en) | 2003-07-24 |
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