scholarly journals Long-Term Materials-Test Program. Annual report and Qualification Test Plan, October 1979-September 1980

1981 ◽  
Author(s):  
Keyword(s):  
Annual Report ◽  
Qualification Test ◽  
Test Plan ◽  
Test Program

Behaviour of friction piles in soft sensitive clays

1980 ◽  
Vol 17 (2) ◽  
pp. 203-224 ◽  
Author(s):  
R. Blanchet ◽  
F. Tavenas ◽  
R. Garneau
Keyword(s):  
Precast Concrete ◽  
Soft Clay ◽  
Load Test ◽  
Pile Groups ◽  
Test Program ◽  
Shear Creep ◽  
Soft Clays ◽  
The North ◽  
Effective Stress Analysis

During the construction of heavy structures, such as bridges and overpasses, on soft clays on the north shore of the St. Lawrence Valley, a detailed load test program on friction piles was performed to establish the characteristics of the most suitable type of pile and to study its long-term behaviour. Three types of piles, timber, steel pipe with closed end, and precast concrete Herkules H-420 piles, were tested. Four timber piles driven in a group and submitted to a 712 kN load served to study the long-term settlement of a small group of piles. Three deep settlement gauges were installed in the centre of this group for measuring settlements in clay at various depths.This test program was completed by the instrumentation of two bridge piers in order to verify the behaviour of larger groups of piles.The paper presents the results of the test piles, the long-term behaviour (4 years) of the bridge pier foundations resting on friction piles in soft clay, and the interpretation of the results.This study shows that the pore pressures induced by pile driving are related to the pre-consolidation of the clay and that they are much larger for tapered piles. It is demonstrated that the effective stress analysis method proposed in 1976 by Meyerhof determines adequately the ultimate pile bearing capacity, but that the effect of the timber pile taper doubles the skin friction.The settlement analysis of pile groups shows that settlements are due to the reconsolidation of the clay and shear creep deformations in the clay close to the pile wall.

Remote Activated Completion Technology Enhances Operational Efficiency of Offshore Wells in Middle East

2021 ◽  
Author(s):  
Vijay Kumar Keerthivasan ◽  
Dustin Young ◽  
Cathrine Mehus ◽  
Bjornar Gjedrem ◽  
Moetaz Abdelghany ◽  
...  
Keyword(s):  
Middle East ◽  
Research And Development ◽  
Field Trial ◽  
New Technology ◽  
Operational Efficiency ◽  
Qualification Test ◽  
Test Program ◽  
Qualification Testing ◽  
Operational Issues ◽  
Reducing Potential

Abstract To access a larger amount of pay zone, well trajectories are becoming longer and more complex, creating greater challenges for running completion liners. A liner shoe is a casing accessory tool that aids in the running of completion liners in long wells by allowing auto-filling of the liner and enabling pumping through the bottom of the liner. Upon reaching planned liner depth, the liner shoe is closed to allow for pressure testing and subsequent completion operations. Conventional methods used to close a liner shoe involve well intervention to set plugs or by dropping a ball, and there are inherent costs and risks associated with these operations. This paper presents the development and deployment of a remotely activated electronic liner shoe (ELS) for offshore applications that enables interventionless closing of the liner shoe, thereby improving operational efficiency, and reducing potential operational issues that could occur while closing the liner shoe conventionally. The ELS allows the operator to precisely control when the liner shoe closes – either based on pre-programmed pressure signals, a timer, or a combination of the two. A major operator in the Middle East required an ELS to be developed and qualified specifically for their offshore well conditions. A new technology qualification program was devised in collaboration with the operator to qualify both the electronic and mechanical functionalities of the tool. This paper documents the methods and results of the extensive qualification test program. The development and qualification process were successfully completed within 10 months at research and development facilities in Norway. Following qualification testing, the ELS was first deployed for the operator in an offshore well in Q4 of 2019. Operational considerations in programming the remote functionality of the tool is presented in this paper. After a successful field trial, the ELS has been run in more than 15 offshore wells and has become the standard option in the operator's completion program.

Pulverized-Coal Transport Through Pipes

1959 ◽  
Vol 81 (1) ◽  
pp. 43-52 ◽  
Author(s):  
R. C. Patterson
Keyword(s):  
Flow Characteristics ◽  
General Information ◽  
Pulverized Coal ◽  
Steam Generators ◽  
Test Program ◽  
Horizontal Pipe ◽  
Friction Factors ◽  
Piping Systems ◽  
Coal Mixtures

Some typical problems related to pulverized-coal transport for steam generators have been investigated in a long-term test program. The investigation has provided information relative to the performance of a commercial-type exhauster handling air-coal mixtures, friction factors for 8 and 12-in-diam pipe handling air-coal mixtures, general information as to the flow characteristics of air-coal mixtures in various piping systems, and methods and means for control of coal drifting in horizontal pipe. Friction factors in the range of 0.017 to 0.035 for 8 and 12-in. pipe are indicated for the usual operating range.

TOPAZ II Non-Nuclear Qualification Test Program

1994 ◽  
Author(s):  
Glen L. Schmidt ◽  
Boris Ogloblin ◽  
Valeri Sinkevich ◽  
Frank Thome ◽  
Mohamed S. El-Genk ◽  
...  
Keyword(s):  
Qualification Test ◽  
Test Program

Update of the Long-Term Inflow and Structural Test Program

2004 ◽  
Author(s):  
Herbert Sutherland ◽  
Jose Zayas ◽  
A. Sterns ◽  
Byron Neal
Keyword(s):  
Test Program ◽  
Structural Test

Long-Term Reliability of Historical Monuments Built with Low Quality Sandstone

2010 ◽  
Vol 133-134 ◽  
pp. 331-336 ◽  
Author(s):  
Els Verstrynge ◽  
Luc Schueremans ◽  
Dionys Van Gemert ◽  
Evert Bourel
Keyword(s):  
Compressive Strength ◽  
Creep Model ◽  
Original Material ◽  
Dead Load ◽  
Test Program ◽  
Long Term Stability ◽  
Sustained Loading ◽  
Historical Monuments ◽  
Set Up

The presented research concerns the long-term stability of a series of historical monuments, which were constructed with low-strength, ferrous sandstone. The main issues are the overall low compressive strength of the sandstone, the large scatter on these strength values, the sensitivity of its characteristics to water absorption and the lack of new original sandstone to replace the damaged zones. The sandstone reacts poorly under sustained high load levels, a situation which typically occurs at the base of bell towers and medieval city towers, as the dead load is considerably high compared to the compressive strength of the sandstone material. To assess the long-term behaviour of the sandstone, a test program has been set up to obtain information on its strength characteristics under monotonic and sustained loading. Therefore, test specimens were taken from the original material of a collapsed church tower. The results of these laboratory tests were used to adapt the parameters of an existing creep model to simulate the long-term behaviour of the sandstone under specific stress levels. Additionally, a number of strengthening solutions are discussed.

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