Dynamic Simulation as a Tool for Optimizing Pressure Control Valve Performance

2002 ◽  
Author(s):  
Jack W. Broyles ◽  
Roger W. Shirt
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
Control Valve ◽  
Pressure Control ◽  
Simulation Software ◽  
Operating Conditions ◽  
Process Data ◽  
Control Valves ◽  
Tuning Parameters ◽  
Pump Station

Control valves installed for pump station pressure control are typically tuned and commissioned at the low end of the flow range and well below the safe operating limits in order to avoid pressure excursions and line shutdowns during commissioning. Tuning parameters selected for best performance at low flowrates often produce poor performance at high flowrates requiring dampened tuning parameters and slower valve actuator speeds. This results in sluggish responses to pressure changes. Enbridge has undertaken a case study to examine three control valves which exhibited poor control characteristics. The goal of this study was to produce an optimal tuning strategy that could be implemented with a high degree of confidence over the entire range of operating conditions. To accomplish this, the IDEAS (AMEC Technologies, Inc.) dynamic simulation software package was utilized. The pipeline was modeled from the pump station upstream of the station of interest to the downstream pump station. The model consists of pipeline sections, pumps, control valves and other process elements that are hydraulically linked. Station discharge and suction pressures are controlled via PI controllers with adjustable set points, ramp rates and tuning constants. Valve full stroke actuator speed can also be varied. Information required to develop the simulation model included station elevations, pipeline lengths, pump curves and control valve Cv curves. The three simulation models developed for this study have been calibrated against process data by adjusting piping resistances. The inherent nonlinearities present in the control valve system were quantified through use of the simulation model. Various strategies to alleviate the adverse effects of these nonlinearities have been studied. Use of a simulation tool also resulted in increasing the awareness of trade-offs present in design and tuning of control valve systems.

scholarly journals Dynamic Simulation of Petrochemical Wastewater Treatment Using Wastewater Plant Simulation Software

2018 ◽  
Vol 203 ◽  
pp. 03005
Author(s):  
Idzham Fauzi Mohd Ariff ◽  
Mardhiyah Bakir
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
Stable Condition ◽  
Oxygen Demand ◽  
Simulation Software ◽  
Petrochemical Plant ◽  
Dynamic Simulation Model ◽  
Plant Monitoring ◽  
Plant Simulation

A dynamic simulation model was developed, calibrated and validated for a petrochemical plant in Terengganu, Malaysia. Calibration and validation of the model was conducted based on plant monitoring data spanning 3 years resulting in a model accuracy (RMSD) for effluent chemical oxygen demand (COD), ammoniacal nitrogen (NH3-N) and total suspended solids (TSS) of ±11.7 mg/L, ±0.52 mg/L and ± 3.27 mg/L respectively. The simulation model has since been used for troubleshooting during plant upsets, planning of plant turnarounds and developing upgrade options. A case study is presented where the simulation model was used to assist in troubleshooting and rectification of a plant upset where ingress of a surfactant compound resulted in high effluent TSS and COD. The model was successfully used in the incident troubleshooting activities and provided critical insights that assisted the plant operators to quickly respond and bring back the system to normal, stable condition.

Simulation of Operation Scheme of Su Cuo Buried Oil Pipeline

2011 ◽  
Vol 356-360 ◽  
pp. 3023-3027
Author(s):  
Li Xin Wei ◽  
Lu Ying Zhang ◽  
Yu Wang
Keyword(s):  
Simulation Model ◽  
Simulation Software ◽  
Operating Conditions ◽  
Operating Parameters ◽  
Saving Energy ◽  
Operating Condition ◽  
Oil Pipeline ◽  
Actual Operating ◽  
Different Seasons

Aim at the actual operating condition of Su Cuo buried oil pipeline, the simulation model of this pipeline operation was built by the simulation software of TLNET to simulate the running states of pipeline in different operating conditions. With the target of saving energy and reducing consumption, the operating parameters of this pipeline with different throughput and different seasons were optimized, and the optimization results can be used to guide the pipeline operation.

Investigation on Flow Characteristics and Stability of Control Valves for Steam Turbines

2008 ◽  
Author(s):  
Guanwei Liu ◽  
Shunsen Wang ◽  
Hui Guo ◽  
Jingru Mao ◽  
Zhenping Feng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Pressure Ratio ◽  
Control Valve ◽  
Operating Conditions ◽  
Flow Coefficient ◽  
Outlet Section ◽  
Steam Turbines ◽  
Control Valves ◽  
Structure Of Flow ◽  
Valve Disc

Through-flow capability and flow stability of some steam turbine control valves were studied by experimental investigation and numerical simulation. Based on the analysis of thermodynamic process in control valve, the relationship of flow coefficient, area ratio of valve outlet section to seat diameter section, pressure ratio and total pressure loss coefficient was deduced, and the expression of polytropic exponent was obtained. The relative deviations between formula results and experimental results are within 3%. Both expressions can be used for design and optimization to determine control valve parameters quantitatively. The results of 3D numerical simulation indicate that the topological structure of flow fields in all control valves is similar. The results of valve stability show that the airflow force acted on the valve disc depends on the vortex strength of flow around valve stem bush and valve disc, the asymmetric transonic impinging jet under the valve disc and the diffusing action. The valve operates steadily when the inlet and outlet Mach number are less than 0.15. As the unload degree is about 85%, stem vibrates at the operating conditions when pressure ratio is less than 0.8 and opening ratio is from 10% to 18%. A multihole annular orifice can make flow steady at all operating conditions.

Guide for Selecting Pressure Control Valves With Actuators Used in Pipeline Applications

2010 ◽  
Author(s):  
Jack Broyles ◽  
Roger Shirt
Keyword(s):  
Selection Criteria ◽  
Large Diameter ◽  
Control Valve ◽  
Pressure Control ◽  
Industrial Applications ◽  
Performance Criteria ◽  
Effective Control ◽  
Critical Threshold ◽  
Control Valves ◽  
Selection Strategies

This paper will discuss guidelines for the selection of pressure control valves (PCV) with electro-hydraulic actuators for use in liquid petroleum pipelines. The performance criteria for PCVs functioning in pipeline pressure control applications are distinct from those used in other industrial applications. Also, PCVs required for large diameter petroleum pipeline represent a relatively small number of total control valve applications. For these reasons, general practitioners of control valve selections, typically engineers at EPCs, commonly apply selection strategies that are effective in other industrial applications, but tend to be less so in pipeline applications. This paper will discuss control valve selection criteria including Critical Threshold Capacity, Effective Control Region and Valve Gain Band. Actuator selection criteria discussed in this paper includes Torque Requirements, Speed of Response, and Positioning Resolution.

scholarly journals A Review of Capillary Pressure Control Valves in Microfluidics

Biosensors ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 405
Author(s):  
Shaoxi Wang ◽  
Xiafeng Zhang ◽  
Cong Ma ◽  
Sheng Yan ◽  
David Inglis ◽  
...  
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Capillary Pressure ◽  
Open Channel ◽  
Control Valve ◽  
Pressure Control ◽  
Pressure Effects ◽  
Helpful Tool ◽  
Control Valves ◽  
Pressure Control Valve

Microfluidics offer microenvironments for reagent delivery, handling, mixing, reaction, and detection, but often demand the affiliated equipment for liquid control for these functions. As a helpful tool, the capillary pressure control valve (CPCV) has become popular to avoid using affiliated equipment. Liquid can be handled in a controlled manner by using the bubble pressure effects. In this paper, we analyze and categorize the CPCVs via three determining parameters: surface tension, contact angle, and microchannel shape. Finally, a few application scenarios and impacts of CPCV are listed, which includes how CPVC simplify automation of microfluidic networks, work with other driving modes; make extensive use of microfluidics by open channel, and sampling and delivery with controlled manners. The authors hope this review will help the development and use of the CPCV in microfluidic fields in both research and industry.

Optimizing Energy in ORBEL II Oil Pipeline

2006 ◽  
Author(s):  
Reinaldo Machado Paulini ◽  
Luis Fernando Gonc¸alves Pires
Keyword(s):  
Energy Savings ◽  
Flow Simulation ◽  
Pressure Control ◽  
Simulation Software ◽  
Economic Effects ◽  
Energy Utilization ◽  
Supply Contract ◽  
Control Valves ◽  
Oil Pipeline ◽  
Implementation Costs

Energy is the major operating expense in a pipeline company. There is considerable incentive to optimize energy utilization to reduce losses as much as possible. This article presents a study of the process and economic effects of substituting traditional pressure control valves by medium voltage frequency variable drives in the ORBEL II oil pipeline. Three drive configurations were chosen and their implementation costs were investigated. Pipeline flow simulation software was used to study the process effects of the drive configuration applications and to calculate the amount of energy spent using control valves and using velocity variable control systems. The differences in energy savings were quantified in financial terms using energy supply contract data and operational data. Finally, an investment analysis was carried out in respect of the energy savings and an estimation of overall implantation costs of the drives.

scholarly journals SIMULINK Simulation Implementation of DS/FH Hybrid Spread Spectrum Communication System

2018 ◽  
Vol 232 ◽  
pp. 04025
Author(s):  
Bing Ma ◽  
Ye He ◽  
Hualong Ma ◽  
Changren Yu
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
Basic Principle ◽  
Spread Spectrum ◽  
Communication System ◽  
System Simulation ◽  
Simulation Software ◽  
Spread Spectrum Communication ◽  
Simulink Simulation

The basic principle of DS/FH hybrid spread spectrum communication system is introduced. The Simulink simulation software is used to establish the system simulation model, and the dynamic simulation of the system is realized. The anti-jamming performance of the system under tracking interference and blocking interference is analyzed.

scholarly journals Dynamic Characteristics Analysis of Power Shift Control Valve

2014 ◽  
Vol 6 ◽  
pp. 824853
Author(s):  
Feng Ren ◽  
Xinhui Liu ◽  
Jinshi Chen ◽  
Ping Zeng ◽  
Boliang Liu ◽  
...  
Keyword(s):  
Simulation Model ◽  
Dynamic Performance ◽  
Control Valve ◽  
Simulation Software ◽  
Vehicle Performance ◽  
Construction Machinery ◽  
Shift Control ◽  
Power Shift ◽  
Characteristics Analysis ◽  
Variation Characteristics

In order to study the influence that dynamic performance of shift control valve has on shifting process of construction machinery, the paper introduces working principle of the shift control valve and sets up the dynamically mathematical model and corresponding simulation model with simulation software LMS Imagine. Lab AMESim. Based on simulation, the paper analyzes the influence of pressure variation characteristics and buffering characteristics acting on vehicle performance during the process of shifting, meanwhile conducting experiments to verify the simulation. The results indicate that the simulation model is accurate and credible; the performance of the valve is satisfactory, which indeed reduces impact during shifting. Furthermore, the valve can meet the demand of other construction machineries in better degree by suitable matching between control spring stiffness and damping holes diameter.

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