Design and Development of a Specially Modified Positive Displacement Rotary Screw Pump and Relevant Hydraulic Circuit to Enhance “Entrained Air Handling” Capability in a Closed Loop Lube Oil System

2014 ◽  
Vol 136 (7) ◽  
Author(s):  
Simone Berti ◽  
Pietro Fracassi ◽  
Alessandra Mattioli ◽  
Varuna Reddy Potula ◽  
Cristiano Lotti
Keyword(s):  
Numerical Data ◽  
Oil And Gas Industry ◽  
Critical Parameters ◽  
Circulation System ◽  
Design And Development ◽  
Screw Pump ◽  
Positive Displacement ◽  
Corrective Actions ◽  
Entrained Air ◽  
Rotary Screw

Rotary screw type positive displacement (RSPD) pumps are commonly used in oil and gas industry for pumping of mineral lube oil in services where they can be mechanically driven by gears coupled to a train driver. Installation of these pumps is critical and should be designed jointly by vendors and users according to project specific restrictions (i.e., the arrangement of the entire oil circulation system). This paper describes a real case in which restrictions due to lube oil system arrangement have produced low pump suction head and have amplified the influence of air bubbles that remained entrained in oil despite lube oil tank degassing. The investigations have been directed toward the mathematical modeling of the aeration phenomenon coupled with experimental measurements of critical parameters taken on the shop plant. Among corrective actions identified and considered there are reduction of quantity of air entering the lube oil system and revamping of the entire lube oil system with changes in piping, tank and also in pump model together with special modifications of internal path to enhance air handling capabilities. In order to validate pump behavior with reference to resistance to aeration (monitoring noise and vibration) a special simulation setup was jointly developed by end user and manufacturer on a pilot test bench to carry out the various performance tests. The numerical data collected during shop aeration test have confirmed that the pump was able to handle the expected amount of entrained air with noise and vibrations within industrial limits. The pumps tested in the pilot bench were installed at user's site and the effectiveness of the synergic corrective actions listed above was successfully verified. The study concludes that an early estimation of entrained air in the lube oil system is critical for design and development of either the RSPD pump or the entire lube oil circuit of a motor compressor train. When a critical quantity of entrained air is likely to be reached at pump suction (near 10% in volume), pump manufacturers and end users should apply some basic rules related to “design for aeration” of the pump and agree on a nonroutine test to be performed at manufacturer's shop before pump installation at site. This will serve as a reliable prediction of pump air handling capabilities, without which effective operation, reliability and durability of the pump could be jeopardized.

Design and Development of a Specially Modified Positive Displacement Rotary Screw Pump and Relevant Hydraulic Circuit to Enhance “Entrained Air Handling” Capability in a Closed Loop Lube Oil System

2013 ◽  
Author(s):  
Simone Berti ◽  
Pietro Fracassi ◽  
Alessandra Mattioli ◽  
Varuna Reddy Potula ◽  
Cristiano Lotti
Keyword(s):  
Numerical Data ◽  
Oil And Gas Industry ◽  
Critical Parameters ◽  
Circulation System ◽  
Design And Development ◽  
Screw Pump ◽  
Positive Displacement ◽  
Corrective Actions ◽  
Entrained Air ◽  
Rotary Screw

Rotary screw type positive displacement (RSPD) pumps are commonly used in Oil and Gas Industry for pumping of mineral lube oil in services where they can be mechanically driven by gears coupled to a train driver. Installation of these pumps is critical and should be designed jointly by vendors and users according to project specific restrictions (i.e. the arrangement of the entire oil circulation system). This paper describes a real case in which restrictions due to lube oil system arrangement have produced low pump suction head and have amplified the influence of air bubbles that remained entrained in oil despite lube oil tank degassing. The investigations have been directed toward the mathematical modeling of the aeration phenomenon coupled with experimental measurements of critical parameters taken on the shop plant. Among corrective actions identified and considered there are reduction of quantity of air entering the lube oil system and revamping of the entire lube oil system with changes in piping, tank and also in pump model together with special modifications of internal path to enhance air handling capabilities. In order to validate pump behavior with reference to resistance to aeration (monitoring noise and vibration) a special simulation set-up was jointly developed by end user and manufacturer on a pilot test bench to carry out the various performance tests. The numerical data collected during shop aeration test have confirmed that the pump was able to handle the expected amount of entrained air with noise and vibrations within industrial limits. The pumps tested in the pilot bench were installed at user’s site and the effectiveness of the synergic corrective actions listed above was successfully verified. The study concludes that an early estimation of entrained air in the lube oil system is critical for design and development of either the RSPD pump or the entire lube oil circuit of a motor compressor train. When a critical quantity of entrained air is likely to be reached at pump suction (near 10% in volume), pump manufacturers and end users should apply some basic rules related to “design for aeration” of the pump and agree on a non-routine test to be performed at manufacturer’s shop before pump installation at site. This will serve as a reliable prediction of pump air handling capabilities, without which effective operation, reliability and durability of the pump could be jeopardized.

Implementation of a Pipeline Integrity Management System at TIGF (France): The Added Value of the Pipeline Threats and Mitigations Module

2008 ◽  
Author(s):  
Karine Kutrowski ◽  
Rob Bos ◽  
Jean-Re´gis Piccardino ◽  
Marie Pajot
Keyword(s):  
Management System ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Management Plan ◽  
Point Of View ◽  
Added Value ◽  
Specific Information ◽  
Transmission Grid ◽  
Integrity Management ◽  
Corrective Actions

On January 4th 2007 TIGF published the following invitation for tenders: “Development and Provision of a Pipeline Integrity Management System”. The project was awarded to Bureau Veritas (BV), who proposed to meet the requirements of TIGF with the Threats and Mitigations module of the PiMSlider® suite extended with some customized components. The key features of the PiMSlider® suite are: • More than only IT: a real integrity philosophy, • A simple intuitive tool to store, display and update pipeline data, • Intelligent search utilities to locate specific information about the pipeline and its surrounding, • A scalable application, with a potentially unlimited number of users, • Supervision (during and after implementation) by experienced people from the oil and gas industry. This paper first introduces TIGF and the consortium BV – ATP. It explains in a few words the PIMS philosophy captured in the PiMSlider® suite and focuses on the added value of the pipeline Threats and Mitigations module. Using this module allows the integrity analyst to: • Prioritize pipeline segments for integrity surveillance purposes, • Determine most effective corrective actions, • Assess the benefits of corrective actions by means of what-if scenarios, • Produce a qualitative threats assessment for further use in the integrity management plan, • Optimize integrity aspects from a design, maintenance and operational point of view, • Investigate the influence of different design criteria for pipeline segments. To conclude, TIGF presents the benefits of the tool for their Integrity Management department and for planning inspection and for better knowledge of their gas transmission grid.

Qualification of Barrier Fluidless, Sealless Seawater Canned Motor Pumps

2021 ◽  
Author(s):  
David L. Stover ◽  
Christian Pagani
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
The Novel ◽  
Screw Pump ◽  
Gas Industry ◽  
Twin Screw ◽  
Qualification Testing ◽  
Shaft Seals ◽  
Canned Motor ◽  
Technology Review

Abstract The oil and gas industry continues to push toward subsea pumping technologies that minimize required support systems and increase system reliability. Canned motor technology has been applied successfully in other applications to achieve similar objectives including driving a subsea twin-screw pump. Applied subsea, canned motors eliminate the need for any barrier fluids within the motor, the myriad of systems and complexities necessary to store and replenish these fluids, and the mechanical shaft seals required to prevent the leaking and/or contamination of these fluids within the motors. As a direct adaptation of proven applications, see Figure 1, subsea water treatment is ideal for canned motor technology. Therefore, a development has been initiated and environment qualification testing of the first truly barrier fluidless, sealless subsea pump solution is complete. This purpose of the paper is to highlight the novel elements of this technology, review the system configuration, and document the system performance in accordance with the TRL 4 qualification initiative.

Effects of Thickness and Winding Angle of the Laminate on Internal Pressure Capacity of Thermoplastic Composite Pipes

2020 ◽  
Author(s):  
H. Xia ◽  
C. Shi ◽  
J. Wang ◽  
X. Bao ◽  
H. Li ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Oil And Gas ◽  
Solid Wall ◽  
Three Dimensional ◽  
Oil And Gas Industry ◽  
Thermoplastic Composite ◽  
Critical Parameters ◽  
Element Analysis ◽  
Composite Pipes ◽  
Winding Angle

Abstract Thermoplastic composite pipes (TCPs) are increasingly used to transport hydrocarbons and water in the oil and gas industry due to their superior properties including corrosion resistance, thermal insulation, light weight, etc. The cross-section of TCPs generally consists of three layers: inner liner, composite laminate, and outer jacket. Three layers are bonded together and form a solid-wall construction. Inner liner and outer jacket made of thermoplastic polymer provide protective barriers for the laminate to against the inner fluid and outer environment. The laminate is constructed by an even number of helically wounded continuous fiber reinforced thermoplastic composite tapes. In this study, mechanical behaviors of a TCP under an internal pressure were investigated by using analytical and finite element analysis (FEA) methods. The analytical method which is based on the three-dimensional (3D) anisotropy elastic theory can take account of non-uniformly distributed stress and strain through the thickness of the pipe wall. FEA models were setup by using the software ABAQUS to predict the stress distribution of the pipe. 3D Tsai-Wu failure criterion was used to predict the maximum internal pressure of the pipe. Effects of some critical parameters, such as the winding angle of composite tapes and the number of reinforced plies, on the internal pressure capacity of TCPs were studied. Results obtained from the analytical and FEA methods were fairly agreed with each other, which showed that with the increasing of the number of reinforced plies the internal pressure capacity of a TCP gradually increases and approaches to an extreme value. In addition, the optimal winding angle which results the maximum internal pressure is not a constant value, instead, it varies with the increasing thickness of the laminate layer. This study provides useful tools and guidance for the design and analysis of TCPs, and is currently under validation through experiments.

scholarly journals Design of a new-concept conical positive displacement slurry pump for continuous de-clogging

2019 ◽  
Vol 287 ◽  
pp. 01017
Author(s):  
G. Vasileiou ◽  
N. Rogkas ◽  
S. Tsolakis ◽  
V. Spitas ◽  
P. Zalimidis
Keyword(s):  
Mass Flow ◽  
Aggregate Size ◽  
Axial Direction ◽  
Mixture Flow ◽  
Screw Pump ◽  
Velocity Increase ◽  
Positive Displacement ◽  
Continuous Mixture ◽  
Novel Concept ◽  
Concrete Pump

Slurry pumps are extensively used in the construction industry while positive displacement screw pumps are used in most mobile concrete pump applications. The aggregate size is known to significantly affect pump performance in terms of clogging. Large aggregates tend to be trapped against the stator-rotor interface, blocking the continuous and smooth operation of the screw pump. In order to avoid the development of excessive stress values able to damage the rotor-stator mechanism of the pump, the typical de-clogging mechanism deployed by most positive displacement screw slurry pumps includes reversing the rotation of the pump driving motor thus allowing the aggregates to be carried away with the mixture, so that the pump can soon resume its operation. This procedure causes frequent start-stops of the pump resulting in dis-continuation of the pumped mixture lasting a few seconds, that while being of little importance in most construction applications, can be of significance in applications requiring higher levels of accuracy and continuous mixture flow. In the context of this work, a novel concept of positive displacement screw slurry pump is presented, including a continuous de-clogging mechanism, without the need to reverse the rotation of the driving motor. This de-clogging operation is achieved through the modification of the geometry of both the rotor and stator introducing a conical form along the axial direction. This configuration of the rotor-stator, allows for small displacements along the axial direction, which in turn increases the size of the cavities facilitating the de-clogging of the pump. Variable pitch is also introduced to both the rotor and stator in order to ensure constant mass flow of the mixture throughout the length of the screw pump covering for the velocity increase as a result of the conical geometry. The axial movement of the rotor in relation to the fixed stator, is achieved through the elastic support of the rotor in the axial direction, that allows for small axial displacements, when stresses induced from trapped aggregates exceed the stiffness of the support. The proposed concept comprises a passive real-time de-clogging mechanism that greatly reduces pump idle time compared to the conventional mechanism described earlier, providing smoother operation and stable mass flow of the mixture.

Improving Reliability of Carbon Steel Girth Welds in Sour Environment

2020 ◽  
Author(s):  
Harpreet Sidhar ◽  
Neerav Verma ◽  
Chih-Hsiang Kuo ◽  
Michael Belota ◽  
Andrew J. Wasson
Keyword(s):  
Carbon Steel ◽  
Base Material ◽  
Oil And Gas Industry ◽  
Critical Parameters ◽  
Welding Parameters ◽  
Pipe Material ◽  
Line Pipe ◽  
Weld Root ◽  
Girth Welds ◽  
Sour Service

Abstract The oil and gas industry has seen unexpected failures of sour service carbon steel pipelines in the recent past. Below par performance of girth welds and line pipe material have been identified as the root causes of such failures. Although mechanized welding can achieve good consistency, the weld region is more heterogeneous as compared to base material, which can lead to inconsistencies and poor weld performance. Overall, the effects of welding parameters on performance of carbon steel pipeline girth welds for sour service are not well understood. Furthermore, industry is moving towards more challenging environments, such as production of hydrocarbons from ultra-deepwater, which further necessitates the need to improve welding practices for additional high criticality applications. Many of the critical parameters for sour service performance will also improve general weld performance for ultra-deepwater. So, there is a clear need to understand the effects of various welding parameters on weld properties and performance. This effort aims at assessing the effects of key welding parameters on performance of girth welds to develop improved welding practice guidelines for sour service pipeline applications. In this study, several API X65 grade line pipe girth welds were made using commercially available welding consumables. The effects on weld root performance of preheat, wire consumable chemistry, hot pass tempering, single vs. dual torch, copper backing, root pass heat input, metal transfer mode, pipe fit-up (root gap, misalignment) were studied. Generally, carbon steel welds with hardness 250HV or below are considered acceptable for sour service. So, detailed microhardness mapping and microstructural characterization were conducted to evaluate the performance and reliability of welds. It was evident that the welding parameters studied have a significant impact on root performance. Preheat and pipe fit-up showed the most significant impact on weld root performance. Based on the results and understanding developed with this study, recommendations for industry are provided through this paper to improve reliability of pipeline girth welds in sour service application.

Failure Analysis of a Bellow at the Exhaust of a Diesel Engine on Board of an FPSO

2017 ◽  
Author(s):  
Ahmed Temani ◽  
Abdennour C. Seibi ◽  
Majdi Chaari ◽  
Abdelkader Bouabdallah ◽  
Rachid Nasri
Keyword(s):  
Diesel Engine ◽  
Oil And Gas ◽  
Water Injection ◽  
Structural Response ◽  
Exhaust System ◽  
Oil And Gas Industry ◽  
Monthly Basis ◽  
Gas Industry ◽  
Positive Displacement ◽  
Short Period

Floating Production, Storage and Offloading (FPSO) units are floating vessels used by the oil and gas industry offshore for the production and processing of hydrocarbons as well as storage of oil. It is equipped with the required facilities to produce, process, and store produced fluids. Among the equipment on board of the FPSO are pumps used to inject water or pump crude oil. This FPSO is fitted with seven positive displacement pumps powered by diesel engines; three for water injection and four for power fluid. At the exhaust of the driving engines, stainless steel bellows experienced frequent failures on a monthly basis; thereby, incurring a huge financial overburden on operating companies. Therefore, the aim of this paper is to explore the possibility of identifying some remedies to overcome this problem. The paper discusses the root causes of bellow failures attached to the exhaust system of a diesel engine on board of an FPSO. Effect of vibration, temperature, corrosion, and vessel rolling on the bellow structural response were investigated to identify the root causes of failure. A finite element modeling of the problem under study was conducted by taking into account the combined effect of thermo-mechanical loads. It was found that the thermal stress was well below the allowable stress. In addition, vibration analysis of the bellow-engine system revealed that the fundamental frequency of the bellow was way below the engine’s natural frequency. However, it was found that the vessel’s rolling generated an elevated stress that can cause failure of the bellow in a very short period time. The paper also presents some possible solutions to remedy or delay failure from occurring frequently as in this case.

scholarly journals Exploiting Solar Thermal Energy in Ammonia Synthesis Plant

2019 ◽  
Vol 8 (4) ◽  
pp. 1721-1729
Keyword(s):  
Energy Consumption ◽  
Oil And Gas ◽  
Ammonia Synthesis ◽  
Numerical Data ◽  
Oil And Gas Industry ◽  
Solar Thermal ◽  
Technological Advancement ◽  
Solar Thermal Energy ◽  
Process Gas ◽  
Industrial Sectors

Energy Is Always Becoming A Key Factor In The Process Of Achieving Any Sort Of Sustainable Development, With Respect To The Drastic Increase In The Global Energy Consumption Throughout The Past Few Decades, Accompanied With The Well-Established Relation Between The Technological Advancement And The Patterns Of Energy Consumption (1). Abundant As Well As Cheap Energy Resources Have Always Fueled The Growth And Development Of Modern Societies. Furthermore, Maintaining A Sustainable Yet Secured Source Of Energy Is Always A Crucial Challenge Nowadays In Order To Achieve Sustainability On All Levels, Economic, Social And Environmental. Medium Temperatures Applications Of Solar Thermal Practices Have Undergone A Remarkable Interest Recently In Various Industrial Sectors. Solar Concentrating Systems Could Properly Serve In Applications And Practices With Temperature Ranges From 85 To 250°C, Taking Their Sun Light Focusing Characteristic And High Thermal And Optical Performance As An Advantage(2). This Research Paper Introduces A System For Solar Energy Heating That Could Be Utilized For Heating Applications And Practices Inside The Oil And Gas Industry. First, The Proper Selection Of The Appropriate Solar System That Could Be Used In Such Applications Was Performed. A Full Analysis Has Been Held On Four Different Mathematical Models In Order To Predict The Optical Efficacy And Thermal Losses For The Selected System, Afterwards The Predictions Are Modeled Using Computer Software For A Comparison With Respect To These Prediction And Numerical Data, Also A Practical Comparison Took Place Using Real Input Data From Experimental And Actual Solar Plants. After That, We Took The Approach To Make Good Use Of Solar Thermal Applications, After Selecting The Most Appropriate Solar Thermal Concentrators, Which Is Parabolic Trough Collectors (Ptc), To Increase The Process Gas Feed Temperature Before Entering The Primary Reformer Reactor In Ammonia Synthesis Plant. The Energy Assessment For The Ammonia Plant, The Engineering, Sizing And Simulation Cases And The Economic Study For The Project Showed A Remarkable Return On Investment.

Design and Development of KSV Engine

1963 ◽  
Vol 85 (2) ◽  
pp. 85-98 ◽  
Author(s):  
M. J. Helmich ◽  
L. S. Ulrey
Keyword(s):  
Diesel Engine ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Performance Data ◽  
Test Evaluation ◽  
Heavy Duty ◽  
Design Features ◽  
Design And Development ◽  
Gas Industry ◽  
Specific Output

This paper describes the prominent design features of new KSV model, 13 1/2 in. bore by 16 1/2 in. stroke, gas, gas-diesel, and diesel engine recently developed for heavy duty service in the oil and gas industry. Mechanical and thermodynamic difficulties that occurred during development test and their solutions are outlined in detail. Performance data obtained during test evaluation are presented and methods to increase specific output are described.

Sign in / Sign up

Export Citation Format

Share Document