MECHANICAL TESTS FOR UMBILICALS

Transcription

1 Escola Politécnica da Universidade de São Paulo Laboratório de Estruturas e Materiais Estruturais ( LEM ) MECHANICAL TESTS FOR UMBILICALS Semi-submersible

2 Escola Politécnica da Universidade de São Paulo Laboratório de Estruturas e Materiais Estruturais ( LEM ) Umbilicals

3 Escola Politécnica da Universidade de São Paulo Laboratório de Estruturas e Materiais Estruturais ( LEM ) Umbilicals

4 Escola Politécnica da Universidade de São Paulo Laboratório de Estruturas e Materiais Estruturais ( LEM ) MECHANICAL TESTS OF UMBILICALS USED IN PRODUCTION OF OIL IN WATER REF: I-ET PAZ-002 Rev. B, Qualification Tests for Control Umbilicals. 1. Static Tests Rigs are mounted for mechanical static testing in umbilical. The following tests may be performed: - Tensile and Collapse Test - Axial Stiffness Characterization Test These tests are performed on the rig shown below, with a capacity of up to 500 tf.

5 Top View of the Tension Rig

6 Top View of the Tension Rig

7 Front View of the Tension Rig

8 Hydraulic Cylinder of the Tension Rig

9 Bonding Gages to Measure Longitudinal and Circumferential Strains Rear View of the Tension Rig

10 Measurement of Longitudinal Elongation and Position of Strain Gages

11 Measurement of Strains in Wires

12 Measurement of Strains in the Armour Pot

13 - Radial Mechanical Compression Test This test is performed on the same rig before, which is positioned a radial compression device, simulating the installation of the umbilical. This device consists of two, three or four shoes, and radial compression in each of which can be up to 100 tons. The shoes are mobile and can be adequate to simulate the geometry of installation. Dicionário - Ver dicionário detalhado adjetivo actuating

14 Radial Compression Device 3 V s Radial Compression Device 4 V s

15 Radial Mechanical Compression Test 4 V s with Tension

16 - Bending Stiffness Characterization Test The rig is composed of a structure supported on rollers, on which is supported the sample. There is no limit for flexion force or the radius of curvature.

17 Force Application in the Bending Stiffness Characterization Test Measurement of the Radius of Curvature

18 - Friction Factor Characterization Test ( External and Internal ) These tests are conducted on a hard rig, consisting of a flanged pipe thickness. It used the same radial compression device, with two, three or four shoes, as explained in mechanical radial compression test. The hydraulic cylinders for tensile load application are different for test determining the external or internal friction. Assembly for the External Friction Factor Characterization Test

19 Shoes for Radial Compression Hydraulic Cylinders for Tensile Load Application ( External Friction )

20 Hydraulic Cylinders for Tensile Load Application Shoes Assembly for the Internal Friction Factor Characterization Test

21 Sample after the Internal Friction Factor Characterization Test

22 2. Dynamic Fatigue Tests The first rig is used to simulate installation conditions of a umbilical. The test, called the Low Cycle Installation Cyclic Bending Test, is performed according to the wheel-shaped device launch in figure below. This rig is also used for the realization of Tensile Test on Bending Jig.

23 Ship launch

24 Wheel launch

25 In this rig the umbilical may be subject to a maximum of 100 tf of tensile load, and the wheel has a diameter of 3.0 m with conforming in the upper and lower sections, which simulate the approximate diameter of 5.7 m of the wheel ship launch. The test duration is unlimited and can be performed for different periods of oscillation of the wheel. Are monitored, among others, tensile load, internal pressures in hoses, electrical resistance of cables and fiber optic signal.

26 In the following photos is shown on the rig operation. Umbilical Test Being Performed

27 Umbilical Test Being Performed

28 End of Umbilical with Electric Cables and Hoses

29 Movie Test

30 The second rig can also be used to simulate the installation conditions of a umbilical. The umbilicals may be subject to a maximum tensile load of 100 tf with conforming to simulate the diameter of the wheel ship launch.

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32 Test in Progress

33 Test in Progress

34 Movie Test

35 The same rig earlier, serves to achieve the Service Cyclic Bending Test - Full Scale Test and whose principle is shown in the figure below. These tests aims to simulate the requests in the region of the bend stiffener, during operation, with simultaneous variation of tensile load and bending angle. This rig is an adaptation of earlier, having the same capacity. In the following figure is shown the arrangement of the rig.

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38 Movies Test

39 The third rig is also used to perform the Service Cyclic Bending Test - Full Scale Test, for greater tensile load with simultaneous variation of the angle. The rig can also be used for Dynamic Tension-to-Tension Top Connection Test.

40 Rig View

41 Hydraulic cylinder to drive the bending

42 Hydraulic cylinder to drive the bending

43 0 a 3 graus sala de controle 0 2 graus abril Movies Test

44 The fourth rig is used to perform the Pull-in Test.

45 Following the testing of pull-in

46 Bending Stiffener enter the I-tube Start the Test Bending Stiffener inside the I-tube

47 Movie Test

48 The control variables of dynamic tests (tensile load, displacement, bending angle, etc...) is done by servo controller ODIN3 or ODIN1200 ( Lynx Electronic Technology ). Dicionário - Ver dicionário detalhado substantivo actuation ODIN3

49 The continuous recording of tensile load, internal pressure in the hoses, bending angle, electrical continuity of conductors and sample temperature are made by a digital system comprising a microcomputer and a signal conditioner type ADS 2000, manufactured by Lynx Electronic Technology. Control Systems ( ODIN1200) and Data Acquisition ( ADS2000 )

50 Control Systems ( ODIN1200) and Data Acquisition ( ADS2000 )

51 Controller ODIN3 and Function Generator Agilent 33220

52 Screen Data Acquisition System, showing the bending angle and the Tensile Load on Sample

53 Screen Data Acquisition System, Showing the Current and Potential Difference in Electrical Conductors

54 All rigs provided can be used for the development of research as well as by manufacturers of umbilicals for the implementation of static and dynamic tests of certification / qualification or product acceptance testing. Escola Politécnica da Universidade de São Paulo Departamento de Engenharia de Estruturas e Geotécnica Laboratório de Estruturas e Materiais Estruturais ( LEM ) Av. Prof. Mello Moraes, 2231 CEP: São Paulo SP Phones: (011) / 5489 Contact : Prof. Dr. Miguel Angel Buelta Martinez ( buelta@usp.br )