CN109163855A - A kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe - Google Patents

A kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe Download PDF

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Publication number
CN109163855A
CN109163855A CN201811188103.XA CN201811188103A CN109163855A CN 109163855 A CN109163855 A CN 109163855A CN 201811188103 A CN201811188103 A CN 201811188103A CN 109163855 A CN109163855 A CN 109163855A
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CN
China
Prior art keywords
steel pipe
test
pressure
test specimen
compressive resistance
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CN201811188103.XA
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Chinese (zh)
Inventor
牛爱军
毕宗岳
刘云
牛辉
赵勇
黄晓辉
焦炜
杨耀彬
田磊
张万鹏
刘斌
席敏敏
赵红波
包志刚
李超
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中国石油天然气集团有限公司
宝鸡石油钢管有限责任公司
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Priority to CN201811188103.XA priority Critical patent/CN109163855A/en
Publication of CN109163855A publication Critical patent/CN109163855A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/026Specifications of the specimen
    • G01N2203/0262Shape of the specimen
    • G01N2203/0274Tubular or ring-shaped specimens

Abstract

The invention discloses a kind of critical external compressive resistance performance test methods of submarine pipeline steel pipe, which mainly includes Selection experiment equipment, the design of steel pipe test specimen, the test of steel pipe test specimen sealing performance, steel pipe test specimen critical external compressive resistance performance test and the evaluation to steel pipe test specimen critical external compressive resistance performance.The test method is primarily adapted for use in the critical external compressive resistance performance test of steel pipe of the submarine pipeline steel pipe under the outer compressive load in ambient water, it is particularly suitable for the critical external compressive resistance performance test of pipelines in deep sea high-strength thick wall steel tube of the depth of water within 3500 meters, this method can realize the physical varification and analysis of experiments of the critical external compressive resistance ability to pipelines in deep sea steel pipe, it is that evaluation is investigated to the comprehensive performance of the indexs such as the mechanical property of submarine pipeline steel pipe and appearance geometric dimension, test result is to submarine pipeline engineering steel pipe in material, wall thickness, the design and control of the indexs such as mechanical property and apparent size have important guiding effect.

Description

A kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe

Technical field:

The invention belongs to the safety and reliability measuring technologies of submarine pipeline steel pipe, relate generally to a kind of pipelines in deep sea use The critical external compressive resistance performance test methods of steel pipe, the test method are primarily adapted for use in submarine pipeline steel pipe and are being in ambient water Critical external compressive resistance performance test under outer compressive load is particularly suitable for the depth of water high-strength thick steel of the pipelines in deep sea within 3500 meters The critical external compressive resistance performance test of pipe.

Background technique:

Global ocean petroleum resources are abundant.Marine oil and gas resource is mainly distributed on continental shelf, accounts for about global ocean oil gas money The 60% of source.In proved reserves, shallow sea is still occupied an leading position at present, but with the progress of oil exploration technology, in recent years next life Boundary stone exploration activity emphasis turns to ocean by land, turns to deep-sea by shallow sea, the exploration of the petroleum resources of deep water and ultra-deep-water is opened Hair has become the major fields of world's oil-gas mining.

Worldwide, the yield of marine oil field is increasing, and is increasingly becoming the pith for filling up insufficiency of supply-demand. Submerged pipeline transports means as a kind of safe and efficient, economic oil gas, at sea has a wide range of applications in oil gas engineering. Since the 1950s the U.S. since Mexico's first submarine pipeline of curved laying, the deep-sea oil gas of current whole world exploitation Field is generally in 2000-3000 meters of the depth of water of waters, and undersea pipe-laying depth alreadys exceed 3052 meters, and most deep Drilling Water Domain and the producing well depth of water are up to 6000 meters or more.It is deep as ocean oil and gas resource exploration develops march toward deep water and ultra-deep-water sea area Extra large Oil And Gas Exploration And Development technology is in continuous advancement, the continuous improvement of pipeline designs discharge pressure, pipelines in deep sea steel pipe to Hi-grade steel, Large Diameter Pipeline, thick wall direction develop, and performance to steel pipe and apparent size etc. propose higher technology and want Ask, this by it is increasingly prominent go out deep-sea oil gas pipeline exploitation and construction importance.

Due to the complexity that the particularity and offshore oil and gas of marine environment produce, it is on active service in low temperature, high pressure, deep-etching Submarine pipeline in marine environment, the joint for being subjected to the dead loads such as external and internal pressure, axial force, moment of flexure and temperature load are made With, and the effect of the dynamic loadings such as the external pressure of alternation, burn into wave, ocean current is still suffered from, so that pipeline is subject a variety of load Synergy and the destruction for causing diversified forms.Especially pipelines in deep sea in ambient water high pressure under, pipeline by Conquassation buckling and buckle propagation phenomenon can be generated under external pressure effect, while also suffering from bending in pipeline laying.Studies have shown that Stability failure of the pipeline in deep-sea extreme environment is that the Main Patterns that it is destroyed are bent once localized crush occurs by inducing Song is propagated, and leads to pipeline global failure, consequence is extremely serious.In recent years, deep-sea pipeline is quickly grown, and depth is continuously increased, and is The conquassation for avoiding deep-sea pipeline, using lesser radius-thickness ratio (D/t), it is desirable that steel pipe has high reliability, good circle Degree and uniform mechanical property.

With the development of Chinese Offshore Oil Industry, more and more petroleum resources are found in deepwater regions.Deep water pipe Road is the important component of deep-sea oil gas Development Engineering, the special marine environment and offshore oil and gas production as locating for it Complexity makes synergy or even some unexpected incidents etc. of the pipeline by burn into wave, ocean current etc., is likely to cause Conquassation buckling occurs for pipeline and buckling extension destroys and brings huge economic loss.Therefore, it is bent for the conquassation of deep underwater pipes The critical external compressive resistance performance test research of Qu Kaizhan steel pipe has important engineering significance.

For the critical external compressive resistance performance test of pipeline steel tube, mostly both at home and abroad at present is based on from the design of the structure of steel pipe, pipeline Carry out some tests and research work in terms of Steel material design, steel tube manufacture technique technology and finite element modelling.Chinese patent 201220368244.1 are referred to a kind of pressure-resistant steel tube, and mainly by the way that compression ring is arranged on tube body, compression ring uniformly covers Method on tube body improves steel pipe to air pressure inside or hydraulic endurance, and then improves the integral strength of tube body.It is Chinese special Benefit 201020585596.3 is referred to a kind of oil/gas well high collapse-resistance casing, and the tube body material is Mn-V steel, tube body Wall thickness is 6.20~7.50mm, by using good heat treatment performance possessed by Mn-V steel, while control tube body wall thickness and Ovality lowers the residual stress that casing generates in straightening process, improves the anti-collapse property of casing.Chinese patent 201610465710.0 being referred to a kind of anti-deep water conquassation Offshore Drilling Riser and its manufacturing method, it is mainly concerned with tubing The manufacturing process of ingredient, organization design and steel pipe.Document " grind with experimental verification by the routed design of ocean non-adherent flexible pipe resistance to compression Study carefully " in order to study non-adhesive flexible pipe synthesis crush resistance, to conquassation imitative experimental appliance carried out Preliminary design, and The analysis of system has been carried out to the complicated applied force form of pipeline.The above related patents are not directed to for submarine pipeline steel pipe Critical external compressive resistance performance test, and have no the relevant statements in the means and method to pipeline steel tube external pressure test.

The invention patent relates to the critical external compressive resistance performance test methods for arriving a kind of pipelines in deep sea steel pipe, the test method is main From the selection of testing equipment, the design of test specimen model, the test of test specimen sealing performance, test specimen external pressure test pressure mode and pipe Acquisition of wall stress data etc. has carried out specific statement, realizes the critical external compressive resistance performance test to submarine pipeline steel pipe, protects Hinder the safe operation of submarine pipeline.

Summary of the invention:

The purpose of the present invention is to provide a kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe, pass through this method Realize to the critical external compressive resistance ability of pipelines in deep sea steel pipe carry out verifying and analysis of experiments, be pipelines in deep sea steel pipe material, The optimization design of wall thickness, performance indicator etc. provides guiding foundation.

The purpose of the present invention is by the following technical programs to solve: a kind of critical external compressive resistance performance of pipelines in deep sea steel pipe Test method, the following steps are included:

(1) Selection experiment equipment

Testing equipment is Deep-sea high voltage simulation test cabin, and what is connect with experimental cabin has data collection system, video monitoring system System and hydraulic control system;

(2) steel pipe specimen Design

The both ends of steel pipe test specimen are welded using blind plate and are blocked, on blind plate design have for inner pressure test water filling port and Exhaust outlet;

(3) test of steel pipe test specimen sealing performance

Steel pipe test specimen internal pressurization is carried out using hydrostatic test device, the maximum pressure of inner pressure test is not greater than steel pipe The yield strength of material for test, otherwise causes material plasticity to deform, and influences subsequent test and detection;Pass through video monitoring system Whether monitoring steel pipe test specimen tube body and end blind plate between internal pressure experimental period there is leakage phenomenon, if do not leaked, Carry out critical external compressive resistance performance test;

(4) steel pipe test specimen critical external compressive resistance performance test

Transverse strain piece and longitudinal strain piece are pasted on the tube wall of steel pipe test specimen;In Deep-sea high voltage simulation test cabin into Row steel pipe test specimen critical external compressive resistance performance test, using water as medium, test specimen is under conditions of being not subject to internal pressure, gradually according to classification pressurization It pressurizes into experimental cabin, the external pressure load that steel pipe test specimen is born in experimental cabin is finally made to reach the design pressure of submarine pipeline Or the maximum external pressure that experimental cabin can be born;Monitor whether steel pipe test specimen tube body between external pressure experimental period goes out by video monitoring system Existing leakage phenomenon, recess or conquassation phenomenon;Acquire the stress of steel pipe test specimen tube wall in hyperbaric chamber in real time by data collection system Data carry out the evaluation of steel pipe critical external compressive resistance performance.

Further, Deep-sea high voltage simulation test cabin can be used for the pipelines in deep sea steel pipe of the depth of water within 3500 meters internal pressure and External pressure test, maximum external pressure can reach 35MPa, and pressure controling precision chamber size in ± 2%, experimental cabin can meet maximum gauge The steel pipe test specimen for being 5000mm for 2500mm, length;

In order to reduce influence of the both ends blind plate to steel pipe test specimen critical external compressive resistance ability, the anti-outer of steel pipe test specimen is more really tested Performance is pressed, and combines the maximum capacity of experimental cabin and the dimensions of steel pipe, the draw ratio of steel pipe test specimen is about (4.0~7.5): 1。

Further, the material that above-mentioned blind plate uses is the 30CrMoA structural alloy steel with high-intensitive, high-ductility.

Further, the test(ing) medium of the test of steel pipe test specimen sealing performance is water, using classification pressuring method step by step to steel Water pressure generation inside pipe test specimen, the pressure between every grade are etc. that amplitudes increase, and transfer pressure is at least divided into 3 grades, each pressure etc. The grade dwell time about 2~3 minutes.

Further, classification pressurization is at least divided into 6 grades in the performance test of steel pipe test specimen critical external compressive resistance, and the pressure between every grade is Etc. amplitudes increase, the dwell time is 3~5 minutes, after being pressurized to maximal pressure force value between every grade, pressure maintaining 15~30 minutes, steady In the pressure phase, pressure drop is no more than 3%.

In order to guarantee the accuracy of strain testing data, foil gauge is using pressure-resistant water blocking tape lead in above-mentioned steps (4) Foil gauge, and protective treatment is carried out to foil gauge using silicon rubber;The strain acquirement port number of data collection system can reach 32 Channel.

The beneficial effects of the present invention are:

(1) present invention can pass through mock-up simulated sea bottom steel for pipe pipe by using Deep-sea high voltage simulation test cabin The critical external compressive resistance performance test of the depth of water within 3500 meters, can effectively assess the critical external compressive resistance of Submarine Pipeline Design steel pipe Performance optimizes the design specification of submarine pipeline steel pipe.

(2) mode that the present invention is blocked by using blind plate and the welding of pipe fitting both ends, material used by blind plate be with High-intensitive, high-ductility 30CrMoA structural alloy steel, has been effectively ensured the intensity of steel pipe test specimen.And bonding apparatus ability and survey The dimensions optimization design draw ratio of steel pipe test block for trying steel pipe improves equipment and uses the true of ability and testing experiment Reality.

(3) present invention demonstrates the sealing performance of test specimen by the test of the internal pressure to steel pipe test specimen, by testing steel pipe Critical external compressive resistance ability of test specimen under conditions of being not subject to internal pressure demonstrates the external design pressure of maximum that steel pipe can be born, to steel Application of the pipe in submarine pipeline engineering provides guarantee basis.In the test of leakproofness and critical external compressive resistance ability to steel pipe test specimen In the process by the way of classification pressure and pressure maintaining, the uniformity that test specimen is pressurized in entire test process ensure that, improve The accuracy of test.

(4) present invention protects foil gauge by using pressure-resistant water blocking tape lead foil gauge, and using silicon rubber Processing, realizes effective acquisition of strain testing data.Foil gauge is pasted by testing test specimen outer wall specific position in steel pipe Layout design, strain acquirement port number at most can reach 32 channels, may be implemented to test specimen axial strain and circumferential strain stress Comprehensive acquisition of data.

(5) present invention both can by test observation steel pipe test specimen during internal pressure and external pressure test test specimen tube body and end Whether sealing plate there is any leakage phenomenon, and test specimen is in defined dwell time section without the macro of unstability, recess or conquassation phenomenon The compressive property of observation angle discriminating test steel pipe is seen, the strain acquirement that test specimen tube wall is pasted can also be tested by steel pipe The compressive property of the discriminating test steel pipe of the rationality of the strain data of test specimen tube wall.

(6) the critical external compressive resistance performance test methods of submarine pipeline according to the present invention steel pipe are to submarine pipeline steel pipe One comprehensive performance of the indexs such as mechanical property and appearance geometric dimension investigates evaluation, and the test method and test result are to seabed The design and control of the performance and apparent size index of steel for pipe pipe have important directive function.

Detailed description of the invention:

Fig. 1 is Deep-sea high voltage simulation test cabin schematic diagram.

Fig. 2 is steel pipe test specimen tube wall foil gauge distribution schematic diagram.

Description of symbols: 1 Deep-sea high voltage simulation test cabin, 2 data collection systems, 3 video monitoring systems, 4 hydraulic controls System processed, 5 high pressure cameras, 6 high pressure headlamps, sliding rail, 8 dewatering outlets, 9 exhaust outlet safety valves, 10 steel pipe test specimens, L are in 7 cabins Steel pipe piece lengths, S are steel pipe test specimen outer circumference, and a1~a12 is 12 Equal round arc length;A is weld seam, and B is transverse strain piece, C is longitudinal strain piece, and M is 1/4 steel pipe piece lengths.

Specific embodiment:

The invention will be described in further detail with reference to the accompanying drawing:

The present invention is used in deep-sea pipeline with X70 φ 914 × 36.5mm vertical masonry joint submerged arc welding steel pipe in the outside of 35MPa For compressive property test under pressure.

(1) Selection experiment equipment

Testing equipment is Deep-sea high voltage simulation test cabin 1, and what is connect with experimental cabin has data collection system 2, video monitoring System 3 and hydraulic control system 4;It will be seen from figure 1 that Deep-sea high voltage simulation test cabin 1 is placed in test melt pit, deep-sea is high The top that pressing mold intends experimental cabin 1 is equipped with high pressure camera 5 and high pressure headlamp 6, and bottom is provided with for installing steel pipe test specimen Cabin in sliding rail 7 and dewatering outlet 8, outside is equipped with exhaust outlet safety valve 9.

The full test pressure of this test is 35MPa, has reached the maximum capacity of testing equipment, pressure controling precision is ± 2%, cabin inner cavity maximum capacity is Φ 2500mm × 5000mm.

(2) steel pipe specimen Design

Wall thickness is used to carry out welding closure for the 30CrMoA structural alloy steel blind plate of 220mm and 10 both ends of steel pipe test specimen, On blind plate design has 1 water filling port and 1 exhaust outlet for inner pressure test, in conjunction with the maximum capacity and steel pipe of testing equipment The Design of length of dimensions, steel pipe test specimen 10 is 4200mm, and the draw ratio of steel pipe test specimen is about 4.6:1.

(3) test of steel pipe test specimen sealing performance

Steel pipe test specimen internal pressurization is carried out using 400MPa hydrostatic test device, is analyzed by calculating, inner pressure test Maximum pressure is 21MPa, and test(ing) medium is water, the pressure using three times' lifting mode step by step to water pressure generation inside test specimen, between every grade Power is incremented by according to 7MPa, and respectively 7MPa, 14MPa, 21MPa, every grade of dwell time are 3 minutes;Pass through video monitoring system Monitor steel pipe test specimen between internal pressure experimental period tube body and end blind plate without obvious leakage, it was demonstrated that steel pipe test specimen, two end-plates and The intensity and sealing performance of weld seam are met the requirements, and can carry out critical external compressive resistance performance test.

(4) steel pipe test specimen critical external compressive resistance performance test

Transverse strain piece B and longitudinal strain piece C is pasted on the tube wall of steel pipe test specimen, strain acquirement instrument used by testing Model MX1615 using 120 ohm of pressure-resistant water blocking tape lead foil gauges, and protects foil gauge using 703 silicon rubber Processing;The different location of weld seam A, tube body on 3 sections of steel pipe test specimen are designed, and 12 groups of transverse strains are arranged Piece B and 12 groups of longitudinal strain piece C (as shown in Figure 2, first by steel pipe test specimen outer circumference S be divided into 12 Equal round arc length a1~ A12, then at the center of steel pipe piece lengths L and two sides are far from 1/4 steel pipe piece lengths M of center, and with circle Paste foil gauge in the intersection arc length a1~a12), real-time monitoring is carried out to the strained situation of tube wall during test respectively;

The critical external compressive resistance performance test of steel pipe test specimen is carried out in Deep-sea high voltage simulation test cabin, using water as medium, test specimen is not Bear internal pressure under conditions of, gradually pressurize into hyperbaric chamber according to 6 grades of pressurizations, respectively 5MPa, 10MPa, 20MPa, 25MPa, 30MPa, 35MPa, the dwell time is 3 minutes, after being pressurized to maximum pressure 35MPa, pressure maintaining 15 minutes, it is desirable that steady between every grade In the pressure phase, pressure drop is no more than 3%;Monitor whether steel pipe test specimen tube body between external pressure experimental period seeps by video monitoring system Leak phenomenon, recess or conquassation phenomenon;Data collection system acquires steel pipe in hyperbaric chamber by the foil gauge on test specimen tube wall in real time The stress data of test specimen tube wall.The results showed that one, during pressure maintaining, maximum pressure drop 0.05MPa, only 1%, sufficiently Demonstrate the accuracy of pressurization;Two, for test specimen under conditions of being not subject to internal pressure, maximum external pressure is loaded onto 35MPa, and pressure maintaining 15 divides Clock, test specimen is without unstability, recess or is crushed phenomenon, and the deformation at tube body measuring point belongs to flexible deformation, and test specimen is bearing the external pressure phase Between strain in elastic strain range;Three, macroscopical observed result and the strain data result of acquisition show steel pipe test specimen energy The outer compressive load of static state of 35MPa is enough born, intensity meets the requirement of 3500 meters of depth of water.

Claims (7)

1. a kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe, it is characterised in that: the following steps are included:
(1) Selection experiment equipment
Testing equipment be Deep-sea high voltage simulation test cabin, connect with experimental cabin have data collection system, video monitoring system and Hydraulic control system;
(2) steel pipe specimen Design
The both ends of steel pipe test specimen are welded using blind plate and are blocked, design has water filling port and exhaust for inner pressure test on blind plate Mouthful;
(3) test of steel pipe test specimen sealing performance
Steel pipe test specimen internal pressurization is carried out using hydrostatic test device, the maximum pressure of inner pressure test is not greater than steel pipe test specimen The yield strength of material, otherwise causes material plasticity to deform, and influences subsequent test and detection;It is monitored by video monitoring system Whether steel pipe test specimen tube body and end blind plate between internal pressure experimental period there is leakage phenomenon, if do not leaked, carry out Critical external compressive resistance performance test;
(4) steel pipe test specimen critical external compressive resistance performance test
Transverse strain piece and longitudinal strain piece are pasted on the tube wall of steel pipe test specimen;Steel is carried out in Deep-sea high voltage simulation test cabin Pipe test specimen critical external compressive resistance performance test, using water as medium, test specimen is under conditions of being not subject to internal pressure, according to classification pressurization gradually to examination Pressurization in hatch checking, finally makes the external pressure load that steel pipe test specimen is born in experimental cabin reach the design pressure or examination of submarine pipeline The maximum external pressure that hatch checking can be born;Monitor whether steel pipe test specimen tube body between external pressure experimental period seeps by video monitoring system Leak phenomenon, recess or conquassation phenomenon;Acquire the stress data of steel pipe test specimen tube wall in hyperbaric chamber in real time by data collection system, Carry out steel pipe critical external compressive resistance performance evaluation.
2. a kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe according to claim 1, it is characterised in that: it is deep Extra large high pressure simulation experimental cabin can be used for the internal pressure and external pressure test of the pipelines in deep sea steel pipe of the depth of water within 3500 meters, maximum external pressure It can reach 35MPa, pressure controling precision chamber size in ± 2%, experimental cabin can meet that maximum gauge is 2500mm, length is The steel pipe test specimen of 5000mm.
3. a kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe according to claim 1, it is characterised in that: knot The maximum capacity of experimental cabin and the dimensions of steel pipe are closed, the draw ratio of steel pipe test specimen is about (4.0~7.5): 1.
4. a kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe according to claim 1, it is characterised in that: it is blind The material that plate uses is 30CrMoA structural alloy steel.
5. a kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe according to claim 1, it is characterised in that: steel The test(ing) medium of the test of pipe test specimen sealing performance is water, using classification pressuring method step by step to water pressure generation inside steel pipe test specimen, Pressure between every grade is etc. that amplitudes increase, and transfer pressure is at least divided into 3 grades, about 2~3 points of each pressure rating dwell time Clock.
6. a kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe according to claim 1, it is characterised in that: steel In pipe test specimen critical external compressive resistance performance test classification pressurization is at least divided into 6 grades, the pressure between every grade be etc. amplitudes increase, every grade it Between the dwell time be 3~5 minutes, after being pressurized to maximal pressure force value, pressure maintaining 15~30 minutes, within the pressure stabilizing phase, pressure drop was no more than 3%.
7. a kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe according to claim 1, it is characterised in that: it answers Become piece using the foil gauge of pressure-resistant water blocking tape lead, and protective treatment is carried out to foil gauge using silicon rubber.
CN201811188103.XA 2018-10-12 2018-10-12 A kind of critical external compressive resistance performance test methods of pipelines in deep sea steel pipe CN109163855A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN102175513A (en) * 2011-01-14 2011-09-07 天津大学 Separable type deepwater seabed pipeline bending test system
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US20140345367A1 (en) * 2013-05-21 2014-11-27 King Fahd University Of Petroleum And Minerals Pipeline leak detector
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102175437A (en) * 2011-01-14 2011-09-07 天津大学 Buckling test device for deepwater submarine conduit
CN102175513A (en) * 2011-01-14 2011-09-07 天津大学 Separable type deepwater seabed pipeline bending test system
CN102435504A (en) * 2011-12-15 2012-05-02 中国石油天然气股份有限公司 In-service pipeline combined load simulation test method and system
US20140345367A1 (en) * 2013-05-21 2014-11-27 King Fahd University Of Petroleum And Minerals Pipeline leak detector
CN203812423U (en) * 2014-04-10 2014-09-03 北京工业大学 Axially-sealed clamp-fast-opening horizontal type deep-sea simulation cabin
CN105403389A (en) * 2015-11-27 2016-03-16 中国石油天然气集团公司 Testing method for pressure-bearing performance of local bending of pipeline

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