Extend Reel-Ability of HMC New Aegir Reeling Vessel Based on Reliability Based Assessment and Bending Tests Program

2012 ◽  
Author(s):  
Erwan Karjadi ◽  
Henk Smienk ◽  
Helen Boyd ◽  
Olav Aamlid
Keyword(s):  
Wall Thickness ◽  
Water Depth ◽  
Pipe Wall ◽  
Local Buckling ◽  
Acceptance Criteria ◽  
Pipe Wall Thickness ◽  
New Era ◽  
Water Pipeline ◽  
The One ◽  
Tension Capacity

Heerema Marine Contractors (HMC) is entering a new era of pipe laying using the reel-lay method for deep and shallow water pipeline installation projects. The new Deep water Construction Vessel (DCV) Aegir is designed to be able to reel/J-lay pipelines for a range of pipe dimension and water depth combinations which on the one side is governed by the equipment limitations (reel drum size, top tension capacity) and on the other side is limited by the code (DNV, API) acceptance criteria for reel/J-lay installation. The paper describes how the code standard acceptance criteria, which have been used to estimate the reel-ability of DCV Aegir and are generally known as conservative approach, can be relaxed in a reliable manner in order to safely extend the DCV Aegir reeling capability. This approach will permit a reduction of minimum reelable pipe wall thickness and result in a wider envelope of water depth applications for reeling from the DCV Aegir. The methodology of relaxation for local buckling and residual ovality criteria has been developed with and approved by DNV specifically for the spooling-on with the DCV Aegir configuration. A series of bend rig tests have been performed at Heriot-Watt University to confirm and validate the new proposed minimum reelable pipe wall thickness. In line with the development of the extended reeling capability, the required tighter specifications for seamless pipe purchased for reeling has been discussed.

DCV Aegir Pipelay Installation Analyses and Capabilities

2013 ◽  
Author(s):  
Henk Smienk ◽  
Erwan Karjadi ◽  
Gabriel Vazquez ◽  
Peter Doherty ◽  
Patrick Dooley
Keyword(s):  
Water Depth ◽  
Deep Water ◽  
High Capacity ◽  
Design Review ◽  
New Era ◽  
Finite Element Software ◽  
Coating Type ◽  
The One ◽  
Pipeline Design ◽  
Tension Capacity

Heerema Marine Contractors (HMC) is entering a new era of pipe laying with the new Deep water Construction Vessel (DCV) Aegir, designed to be able to reel/J-lay pipelines for a broad range of pipe dimension and water depth combinations. On the one side this is governed by equipment/vessel limitations (moonpool size, high top tension capacity, stinger component capabilities) and on the other side limited by pipeline design code (e.g. DNV, API) acceptance criteria for reel-lay and J-lay installation. This paper outlines the pipelay capabilities of DCV Aegir and details the J-lay (with quad joints) and reel-lay installation analyses performed to aid in the design of the vessel pipelay equipment. DCV Aegir has two modes for J-lay installation, which are light J-lay with friction clamps and heavy J-lay with collar clamps in combination with collars in the pipeline. DCV Aegir reel-lay installation from the pipeline in the tensioners down to the seabed will also be explained. Light J-lay, heavy J-lay and reel-lay have maximum top tension capacities (related to the equipment) of 600 mT, 2000 mT and 800 mT, respectively. The top tension capacity also depends on pipe OD, coating type and thickness. J-lay and reel-lay installation analyses are performed with the non-linear finite element software package Flexcom from MCS Kenny to determine installation capabilities with respect to pipe OD, wall thickness and water depth combinations. Together with that the pipelay equipment design is validated by pipeline installation analyses. Shallow and deep water normal pipeline installation for all three pipelay options will be discussed. DCV Aegir pipelay equipment includes a retractable hang off module/stinger for deployment of pipelines. The usage and benefits of the hang off module will be documented. For the J-lay installation modes the procedure for lowering a quad joint is analysed in order to optimise equipment usage. DCV Aegir possesses a high capacity abandonment and recovery system (up to 2000mT). Abandonment and recovery analyses description and design review aspects will be discussed. Finally, the pipeline in-line structure installation analyses, together with design review considerations will be documented.

Development of a mathematical model of the influence of wall thickness on the strain rate when profiling pipes by drawing

2020 ◽  
pp. 49-52
Author(s):  
R.A. Okulov ◽  
N.V. Semenova
Keyword(s):  
Mathematical Model ◽  
Strain Rate ◽  
Wall Thickness ◽  
Pipe Wall ◽  
Strain Intensity ◽  
Thickness Strain ◽  
Pipe Wall Thickness

The change in the intensity of the deformation of the pipe wall during profiling by drawing was studied. The dependence of the strain intensity on the wall thickness of the workpiece is obtained to predict the processing results in the production of shaped pipes with desired properties. Keywords drawing, profile pipe, wall thickness, strain rate. [email protected]

Leak Testing

2021 ◽  
pp. 143-147
Author(s):  
Charles Becht
Keyword(s):  
Wall Thickness ◽  
Pipe Wall ◽  
Piping System ◽  
Pipe Wall Thickness ◽  
Pressure Testing ◽  
Leak Testing ◽  
Piping Systems ◽  
Design Pressure ◽  
Important Test

While the exercise of pressurizing a piping system and checking for leaks is sometimes called pressure testing, the Code refers to it as leak testing. The main purpose of the test is to demonstrate that the piping can confine fluid without leaking. When the piping is leak tested at pressures above the design pressure, the test also demonstrates that the piping is strong enough to withstand the pressure. For large bore piping where the pipe wall thickness is close to the minimum required by the Code, being strong enough to withstand the pressure is an important test. For small bore piping that typically has a significant amount of extra pipe wall thickness, being strong enough is not in question. Making sure that the piping is leak free is important for all piping systems.

Simulation of Ductile Tearing in a Dissimilar Material Weld up to Pipe Wall Break-Through

2010 ◽  
Author(s):  
Philippe Gilles ◽  
Alexandre Brosse ◽  
Moi¨se Pignol
Keyword(s):  
Crack Initiation ◽  
Crack Growth ◽  
Wall Thickness ◽  
Surface Crack ◽  
Pipe Wall ◽  
Ductile Crack ◽  
Pipe Wall Thickness ◽  
Ductile Tearing ◽  
Ductile Crack Growth ◽  
Computational Analyses

This paper presents ductile initiation calculations and growth simulations of a surface crack up to pipe wall breakthrough. For validation purpose, one of the two BIMET configurations is selected. The EC program BIMET has been carried out to analyze the ductile tearing behavior of DMWs through experiments and computational analyses. In the mock-up, the initial defect is an external circumferential defect located close to the weld-ferritic interface, with a depth of one third of the wall thickness. During the test, the crack extended up to two third of the pipe wall thickness. The aim of the study is to simulate the crack initiation and growth, to compare the results with the experimental records and to continue the ductile crack growth up to pipe wall break-through.

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