The Effect on Dynamic Steel Tube Umbilical Fatigue Performance Associated With Designing for Elevated Temperature

2017 ◽  
Author(s):  
Jamie Fletcher-Woods ◽  
Jake Noble ◽  
Lewis Balfour
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Material Selection ◽  
Steel Tube ◽  
Fatigue Performance ◽  
Contact Load ◽  
Component Level ◽  
Steel Tubes ◽  
The Coefficient Of Friction ◽  
Design Case

The expansion of umbilical functionality to include power cables and high temperature fluid transportation (for applications such as gas lift) has led to the requirement for a high temperature steel tube riser umbilical, as shown in Figure 1. The combination of the elevated temperature and the dynamic service conditions create a unique design brief for steel tube umbilicals. The following paper presents a case study evaluating a steel tube riser umbilical capable of transporting hot gas at 70°C from an FPSO to a well head at approximately 800m water depth. The material selection for the steel tube is super duplex stainless steel (SDSS) and due to the high temperature, the corrosion resistant coating selected to ensure corrosion resistance in seawater at 70°C is fusion bonded epoxy protected with a bonded polypropylene outer layer (3LPP). The fatigue performance of the dynamic steel tube umbilicals is highly dependent on the frictional loads between the components developed due to tension and bending. This loading is most critical in the bend stiffener location at the riser umbilical’s interface with the FPSO structure. The fatigue critical component is usually determined to be one of the super duplex steel tubes within the umbilical. The frictional loads are a function of the coefficient of friction between the interacting components and the contact load developed between the layers of helically wound components. This contact load increases with tension. The paper considers the effects of the polypropylene material selection and the elevated operating temperature on the friction interface between the steel tubes. The work assesses the corresponding change in fatigue damage through the service life in comparison to more common temperatures and materials used in dynamic steel tube umbilicals. Changes in contact load between elements of a friction interface are known to affect the friction coefficient. The contact load across all interfaces has been varied to help understand how the coefficient of friction may be affected by different tensile loads or umbilical designs. Including this variable in the test program also ensures that the friction is quantified at a contact load relative to the design case considered. To assess the differences in friction a scope of component level friction testing is presented and the results are processed through umbilical local fatigue analysis software to establish the implications on fatigue performance. The umbilical structure is designed to free flood in between the components in service, and the bend stiffener region is submerged for the design case in question. Full scale flex-fatigue testing of the dynamic umbilical and the bend stiffener are however conducted in a dry environment. The impact of this on the severity of the test and in comparison to the in-service condition are assessed using component level wet and dry testing to provide changes in friction for sensitivity analysis. In addition to the loading on the tubes, the fatigue performance of the material being loaded is also considered. the fatigue performance of welded super duplex tubing has previously been tested and documented at ambient room temperature conditions and therefore the effect on the welded steel tube fatigue performance due to the increase in temperature for this application has been quantified to ensure the proposed design curve is suitable. cyclic bending stress experienced by the steel tubes during dynamic service (2).

Study of the Torsional Behavior of Aluminum Foam-Filled Galvanized Steel Tubes after High Temperature

2018 ◽  
Vol 773 ◽  
pp. 238-243
Author(s):  
Zhan Guang Wang ◽  
Yang Wang
Keyword(s):  
High Temperature ◽  
Aluminum Foam ◽  
Load Capacity ◽  
Steel Tube ◽  
Galvanized Steel ◽  
Steel Tubes ◽  
Torsional Load ◽  
Torsional Behavior ◽  
Before And After ◽  
Foam Filled

Torsional test of aluminum foam-filled galvanized steel tube before and after high temperature is performed. The influence of temperature, porosity of aluminum foam and steel ratio on torsional behavior of aluminum foam galvanized steel tubes were analyzed. Experimental results showed that torsional curves of aluminum foam-filled galvanized steel tube before and after high temperature is similar, and can be divided into four stages: the elastic torsional stage, yield platform stage, descent stage and hardening stage; Its torsional load capacity decreases with increasing porosity of aluminum foam and increases at a higher steel content and slenderness ratio; after high temperature, torsional load capacity of galvanized steel tube decreased significantly. It was found that the strength reduction factor ratio under the elevated test temperature is higher than that recommended by British ECCS, Australian AS4100 and Chinese CECS 200-2006.

Characterization and Technical Comparison Between Steel Tube Umbilicals and Thermoplastic Hoses Umbilicals

2009 ◽  
Author(s):  
Andre´ Athayde Gonc¸alves ◽  
Fernando Buscacio de Almeida ◽  
Marco Antoˆnio Dias ◽  
William Albuquerque da Silva ◽  
Yonathan Reboh
Keyword(s):  
Selection Criteria ◽  
Material Selection ◽  
Structure Type ◽  
Steel Tube ◽  
Steel Tubes ◽  
Advantages And Disadvantages ◽  
Great Production ◽  
Higher Temperature ◽  
And Control ◽  
Production Losses

Subsea umbilicals are key part on the development of deep water fields. Generally, they are used to connect Platforms to all type of subsea equipment. Umbilicals’ component failure may result to great production losses. Traditionally, Petrobras uses thermoplastic hoses for chemical injection and control applications in its subsea systems; it has acquired a great deal of technical knowledge. Nevertheless, in recently presented layouts, the steel tubes have gained importance worldwide and this was due the increased water depth, integrity and higher pressure / higher temperature. This present paper makes a technical comparison between Steel Tube Umbilicals and Thermoplastic Hose Umbilicals with focus on Petrobras experience. The first part analyzes material selection criteria considering each structure type. Subjects such as material, welding and construction of both types are commented. This work also points to important subjects that suppliers must consider when designing and manufacturing umbilicals. The second part presents the Petrobras’ qualification tests of control umbilicals. Some of the tests that are used for steel tubes, thermoplastic hoses and high collapse resistant hoses are listed as well. On the third part, the focuses are the fatigue analysis, installation procedures and corrosion aspects. The work concludes listing some advantages and disadvantages when using Steel Tube Umbilicals or Thermoplastic Hoses Umbilicals, considering Petrobras scenarios.

Addressing Corrosion Stress Cracking Issue of Magnesium Frac Plugs Used in Ultra HPHT Shale Well Development

2021 ◽  
Author(s):  
Timothy Ryan Dunne ◽  
Wenhan Yue ◽  
Lei Zhao ◽  
Damon Nettles ◽  
Peng Cheng ◽  
...  
Keyword(s):  
High Temperature ◽  
Magnesium Alloy ◽  
Material Selection ◽  
Tap Water ◽  
High Strength ◽  
Secondary Phase ◽  
Dissolution Testing ◽  
Secondary Phases ◽  
Component Level ◽  
Premature Failure

Abstract The paper discusses the unrecognized issue of accelerated cracking and dissolution of stressed high strength dissolvable magnesium components at elevated temperature. A high strength dissolvable magnesium alloy was selected for inclusion in a frac plug designed for 125°C to 175°C service after thorough tensile, compression, and dissolution testing of the alloy. After a 125°C plug field test, the plug exhibited catastrophic, premature failure. Laboratory plug testing of two magnesium alloys for the slips replicated the failure at 140°C in tap water. Dissolution testing of coupons in a more aggressive media showed inadequate mass loss to compromise functionality. It was theorized that the passivating magnesium layer was unable to form due to the stress applied to the components with magnesium's inherent reactivity with water. Slow strain rate testing was used to study the potential mechanism causing stress corrosion cracking. Two high temperature high strength alloys, DM-1 and DM-2, were tested at 4 x 10^-6 in/in/s in 140°C tap water. DM-1 demonstrated a decrease in yield from 52.4 ksi to 33 ksi, a 37% reduction as well as a decrease in ductility from 10.9% to 0.8%, a 93% decrease. DM-2 demonstrated a decrease in yield from 59.3 ksi to 32.3 ksi, a 46% reduction as well as a decrease in ductility from 10.3% to 0.7%, a 93% decrease. A scanning electron microscope evaluation showed both materials possessed a highly developed secondary phase surrounding the grain boundaries. The development and subsequent investigation of an alternative magnesium alloy, DM-3, showed semi-continuous secondary phases and was investigated for a substitute at a component level. While the ultimate tensile strength decreased minimally, the ductility decreased by 36%. Laboratory testing of the plug in identical conditions with the DM-3 slips was still successful. It is imperative for high temperature magnesium plug material selection to ensure the alloy does not have highly interconnected secondary phases which may cause sudden failure during field operation.

Microstructural characterization of a rapidly solidified Al-Fe-V-Si alloy for elevated temperature applications

1988 ◽  
Vol 46 ◽  
pp. 550-551
Author(s):  
R. E. Franck ◽  
J. A. Hawk ◽  
G. J. Shiflet
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Grain Growth ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Temperature Applications

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

UDIMET 41

Alloy Digest ◽  
1964 ◽  
Vol 13 (6) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Precipitation Hardening ◽  
Base Alloy ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Temperature Performance ◽  
Nickel Base ◽  
Corrosion And Oxidation

Abstract UDIMET 41 is a vacuum induction melted precipitation hardening nickel-base alloy having outstanding room and elevated temperature properties. It possesses excellent corrosion and oxidation resistance. It is designed for highly stressed components operating in the 1400-1700 deg F temperature range. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-92. Producer or source: Special Metals Inc..

MO-RE 40MA

Alloy Digest ◽  
1998 ◽  
Vol 47 (12) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Creep Strength ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant ◽  
Temperature Performance

Abstract MO-RE 40MA is a fully austenitic heat-resistant alloy for elevated temperature applications. The alloy is microalloyed for creep strength and oxidation resistance. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance. Filing Code: Ni-548. Producer or source: Duraloy Technologies Inc.

UDDEHOLM QRO 80 MICRODIZED

Alloy Digest ◽  
1987 ◽  
Vol 36 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Tool Steel ◽  
Die Casting ◽  
Heat Treating ◽  
Temperature Performance ◽  
Improved Performance

Abstract UHB QRO 80 MICRODIZED is a chromium-molybdenum-vanadium tool steel with improved performance for tooling used at elevated temperature as in forging, extrusion and die casting. It is electro-slag refined. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-486. Producer or source: Uddeholm Aktiebolag.

J&L TYPE 309

Alloy Digest ◽  
2003 ◽  
Vol 52 (12) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Good Combination ◽  
Resistance To Oxidation ◽  
Cold Worked ◽  
Specialty Steel

Abstract Type 309 (UNS S30900) is an austenitic chromium-nickel stainless steel widely used for elevated-temperature services. It has a good combination of oxidation resistance and corrosion-resisting properties. The alloy is essentially nonmagnetic when annealed and become slightly magnetic when cold worked. It is intended primarily for high-temperature applications at 816 deg C (1500 deg F) or higher where resistance to oxidation and/or corrosion is required. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-896. Producer or source: J & L Specialty Steel Inc.

The Study on Static Force Behavior of Concrete Filled Steel Tube Lattice Wind Generator Tower Joints

2013 ◽  
Vol 671-674 ◽  
pp. 833-837
Author(s):  
Yang Wen ◽  
Fei Zhou
Keyword(s):  
Tube Wall ◽  
Local Buckling ◽  
Steel Tube ◽  
Wall Region ◽  
Steel Tubes ◽  
Concrete Filled Steel Tube ◽  
Wind Generator ◽  
Nonlinear Static ◽  
Angle Steel ◽  
Section Form

In order to discuss the failure mechanism of concrete filled steel tube lattice wind generator tower joints. Based on the parameters of web member section form, and using nonlinear static numerical simulation, this dissertation research on the stressed complex joints. The results of the study show that the abdominal rod for circular steel tubes joint (JD1) is instability failure which is led to the local buckling of compressive bar; the abdominal rod for single angle steel (JD2) or double angle steel (JD3) joint is instability failure because of the local buckling of the joint board. Under the web members and joint boards all fitting their own capacity requirements, JD1 is very easy to make draw bar broken on both sides of the pillar tube wall region, JD2 and JD3 are apt to damage on the weak positions of joint board ends and pillar tube wall joint. In the three forms of web member joints, the best ultimate bearing capacity is JD1 , JD3 is the second and JD2 is minimum.

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