Research on method for modelling and control of feedwater piping system based on internal characteristics of the feedwater pump

2019 ◽  
Author(s):  
Zou Hai ◽  
Zheng Ying ◽  
Du Enwu
Keyword(s):  
Piping System ◽  
Feedwater Pump ◽  
And Control

Control Valve Design Impact on Piping Vibration

2004 ◽  
Author(s):  
James McGhee ◽  
Doug Newlands ◽  
Stuart Farquhar ◽  
Herbert L. Miller
Keyword(s):  
Energy Levels ◽  
Control Valve ◽  
Piping System ◽  
Detection Systems ◽  
The North ◽  
Air Supply ◽  
The North Sea ◽  
Pipe Breakage ◽  
And Control ◽  
Fatigue Failures

Vibration of the recycle piping system on the Main Oil Line (MOL) Export Pumps from a platform in the North Sea raised concern about pipe breakage due to fatigue. Failures had already occurred in associated small bore piping and the instrument air supply lines and control accessories on the recycle flow control valves. Concern also existed due to the vibration of non-flowing pipe work and systems such as the deck structure, cable trays and other instrumentation, which included fire and gas detection systems. Many changes involving bracing of small bore attachments, stiffening of supports, adding supports and stiffing the deck structure were implemented without resolving the problem. The vibration was finally solved by adding enough pressure stages to assure the valve trim exit velcoities and energy levels were reduced to levels demonstrated historically as needed in severe service applications. This vibration energy reduction was more than 16 times. This was achieved by reducing the valve trim exit velocity from peaks of 74 m/s to 12 m/s (240 ft/s to 40 ft/s).

scholarly journals KAJIAN TEKNOLOGI PEMANFAATAN BIOGAS POME (PALM OIL MILL EFFLUENT) KE BOILER

2019 ◽  
Vol 13 (1) ◽  
pp. 43-54
Author(s):  
Bambang Sucahyo ◽  
Dwi Lukman H ◽  
Rohmadi Ridlo ◽  
Tyas Puspita R ◽  
Erna Rosmala S
Keyword(s):  
Palm Oil ◽  
Valve Train ◽  
Control Panel ◽  
Piping System ◽  
Steam Boiler ◽  
Steam Boilers ◽  
Forced Draft ◽  
Gas Burner ◽  
Palm Oil Mill ◽  
And Control

In collaboration with BPPT,  PTPN V management starting in 2018 took place at the Sei Pagar  Mill PTPN V in Riau Province, planning the implementation of Biogas to Boiler technology to maximize the use of Biogas. The study aims to substitute shells for steam boilers / kettle through the scheme of using biomass POME to boilers at palm oil mills. The Utilization Model is a simple representation  of a complex process in reality. To produce the scheme the model was preceded by conducting technical studies and economic studies and comparative studies on several Mill s in Sumatra and Kalimantan. From some of the findings from the studies that were compiled, one of the most suitable models will be made that will be applied in the Sei Pagar Mill. Furthermore, from the model, still through the RISTEKDIKTI Flagship Insinas Program, it will be developed to produce Prototypes and Construction / modifications to the Existing Boiler that is applied to the Sei Pagar Mill . Utilization Model Scheme. Biogas POME to Boilers at Palm Oil Mill by applying Biogas to Boiler technology includes several components of equipment, such as: Blower, Piping System, Valve Train, Gas Burner (Single Burner), Forced Draft Fan, and Control Panel (PHB). Utilization Model. Biogas POME to Boilers at Palm Oil Mill can later be developed and implemented to support the application of Biogas to Boiler technology at Palm Oil Mills in Indonesia.Keywords: Steam Boiler / Boiler, Blower, Piping System, Valve Train, Gas Burner (Single Burner), Forced Draft Fan, and Control Panel (PHB)

Vibration Analysis and Control for Reciprocating Compressor Piping System

2012 ◽  
Vol 157-158 ◽  
pp. 930-934
Author(s):  
Yong Dong Li ◽  
Sheng Liang Han ◽  
Jie Liu ◽  
Ji Yong Liu ◽  
He Du
Keyword(s):  
Vibration Analysis ◽  
Operating Conditions ◽  
Design Parameters ◽  
Piping System ◽  
Reciprocating Compressor ◽  
Adequate Model ◽  
Column System ◽  
System Pressure ◽  
Compressor Pipe ◽  
And Control

Following the adequate model of the reciprocating compressor piping system and the compressor design parameters, operating conditions and gas parameters, the mechanical system of compressor piping, gas-column system, pressure pulsations and of vibration response are numerically simulated. And the main factor bringing to the compressor piping system vibration is identified. A reasonable way to controlling piping vibration is developed to achieve a better efficiency. Keywords: Compressor; Pipe vibration; Vibration Analysis; numerical simulation.

Optimal Control for Vibration of Restrained Cantilever Fluid-Conveying Pipe

2013 ◽  
Vol 483 ◽  
pp. 409-418 ◽  
Author(s):  
Ri Dong Bao ◽  
Jun Feng Dong
Keyword(s):  
Optimal Control ◽  
Control Method ◽  
Work Conditions ◽  
Effective Control ◽  
Piping System ◽  
Control Effect ◽  
State Matrix ◽  
Optimal Position ◽  
Piezoelectric Patch ◽  
And Control

The cantilever fluid conveying pipe which restrained by linear spring and cubic nonlinear spring at its free end was studied and the nonlinear vibration of this piping system was carried out optimal control making use of piezoelectric patch as actuator. Firstly, the governing equations of the controlled system were derived out. Then the optimizer and mode sensor were schemed out. Finally, the control effect of the designed controller on system vibration was validated and analyzed through numerical simulation. The simulation results showed that the designed optimal controller can actualize effective control for the monocyclic motion, multi-cyclic motion and chaotic motion of the pipe conveying system. Meanwhile, the effect of state weight-matrix and control energy weighing coefficients on control performance of system, the influence of the position and length of piezoelectric patch on minimal performance index of system were also been under discussion. For practical application of this control method, we should synthetically consider all of the practical conditions and demands to select the optimal position and length of piezoelectric patch and the optimal weight value of state matrix and control energy according to different work conditions.

scholarly journals Improving the energy efficiency of the pipeline system by ensuring its linear flow characteristic

2021 ◽  
Vol 279 ◽  
pp. 01019
Author(s):  
Denis Dymochkin ◽  
Mariya Kilina ◽  
Vyacheslav Grishenko ◽  
Alexandr Kharchenko
Keyword(s):  
Energy Efficiency ◽  
Entire Range ◽  
Flow Characteristic ◽  
Control Signal ◽  
Pipeline System ◽  
Piping System ◽  
Control Valves ◽  
Signal Change ◽  
Energy Efficiency Indicator ◽  
And Control

Recently, SMART positioners have been widely used to control the on-off and control valves. These devices allow you to set an arbitrary user dependence of the valve travel on the control signal. This makes it possible to provide a linear throughput for the entire piping system. This allows the use of smaller type control valves while maintaining the control range. Accordingly, the energy consumption for controlling the shutoff element is reduced; the value of the reinforcement energy efficiency indicator is improved. In that work analytically calculates a user dependency that takes into account the value of pipeline throughput and allows to obtain a linear throughput of the pipeline system in the entire range of control signal change.

scholarly journals Módulo didáctico para controlar nivel y caudal de agua, mediante sistema SCADA, PLC y algoritmo PID

2020 ◽  
Vol 4 (2) ◽  
pp. 50
Author(s):  
Andrade Cedeño Rogger
Keyword(s):  
Control System ◽  
Pid Control ◽  
Control Algorithm ◽  
Control Level ◽  
Control Valve ◽  
Piping System ◽  
Level Control ◽  
Educational Module ◽  
Scada System ◽  
And Control

  In this project, design and construction of an educational module has been carry out, allowing understand in a practical way, the concepts related to: control system, instrumentation, actuator, programmable logic controller, SCADA system and control algorithm. Module’s principal components are main tank, reserve tank, piping system, fittings, differential pressure transducer, turbine flowmeter, rotameter, control valve, solenoid valves, servovalve, centrifugal pump, PLC and a personal computer (PC). With this, automatic flow and water level control were achieve, through the implementation of a PID control algorithm. In the end, operation tests have been perform, generating changes in set point, and generating disturbances, to observe the response of the process and assess the control system.   Keywords — control system, instrumentation, flow control, level control, PLC, SCADA, PID controller

Vibration analysis and control of a screw compressor outlet piping system

2018 ◽  
Vol 233 (2) ◽  
pp. 403-411
Author(s):  
Ying Zhao ◽  
Jianmei Feng ◽  
Bin Zhao ◽  
Shuangmei Zhou ◽  
Zhou Tang ◽  
...  
Keyword(s):  
Vibration Analysis ◽  
Pressure Pulsation ◽  
Measurement Data ◽  
Screw Compressor ◽  
Piping System ◽  
Finite Element Models ◽  
Excessive Pressure ◽  
First Order ◽  
Vibration Problem ◽  
And Control

The severe vibration of a screw compressor outlet piping system caused the premature failures of some thermowells and the unplanned shut down of the compressor system. The root causes of the vibration problem were investigated by numerical simulations. An acoustic model was established to predict the pressure pulsation of the gas inside the pipelines, and two finite element models were built to study the vibration characteristics of the overall piping system and of the thermowells. The numerical results indicated that the vibration problem may be attributed to the excessive pressure nonuniformity of the gas inside the pipelines, low overall stiffness of the piping system and the first-order structural resonance occurred on the thermowells. A pulsation attenuator was added and the pipelines were rearranged to reduce the pressure pulsation, some pipe supports were added to improve the overall stiffness of the piping system, and the thermowells were reinforced to avoid the first-order structural resonance. After the modifications, the field measurement data showed that the vibration of the piping system decreased significantly, and the modified piping system has been operating normally for nearly two years.

Control of Metal Alloy Oxidation with Electric Fields

1973 ◽  
Vol 31 ◽  
pp. 164-165
Author(s):  
R. R. Dils ◽  
P. S. Follansbee
Keyword(s):  
Electric Fields ◽  
Oxidation Process ◽  
Base Alloy ◽  
Oxide Surface ◽  
Platinum Electrodes ◽  
Insulating Layer ◽  
Iron Base Alloy ◽  
Alloy Oxidation ◽  
Aluminum Oxide Layer ◽  
And Control

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.

Evidence for a Blood Ganglion Barrier in the Superior Cervical Ganglion of the Rat

1982 ◽  
Vol 40 ◽  
pp. 204-204
Author(s):  
D. M. DePace
Keyword(s):  
Blood Vessels ◽  
Superior Cervical Ganglion ◽  
Peripheral Nerves ◽  
Time Schedule ◽  
Transmission Electron ◽  
Cervical Ganglion ◽  
The Central Nervous System ◽  
Cervical Ganglia ◽  
Capillary Circulation ◽  
And Control

The majority of blood vessels in the superior cervical ganglion possess a continuous endothelium with tight junctions. These same features have been associated with the blood brain barrier of the central nervous system and peripheral nerves. These vessels may perform a barrier function between the capillary circulation and the superior cervical ganglion. The permeability of the blood vessels in the superior cervical ganglion of the rat was tested by intravenous injection of horseradish peroxidase (HRP). Three experimental groups of four animals each were given intravenous HRP (Sigma Type II) in a dosage of.08 to.15 mg/gm body weight in.5 ml of.85% saline. The animals were sacrificed at five, ten or 15 minutes following administration of the tracer. Superior cervical ganglia were quickly removed and fixed by immersion in 2.5% glutaraldehyde in Sorenson's.1M phosphate buffer, pH 7.4. Three control animals received,5ml of saline without HRP. These were sacrificed on the same time schedule. Tissues from experimental and control animals were reacted for peroxidase activity and then processed for routine transmission electron microscopy.

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