scholarly journals Pipe Stress and Turbine Nozzle Load Analysis for HP Steam Inlet and MP Steam Extraction on Turbine Generator 51G201T Capacity 10MW

2018 ◽  
Vol 7 (4.33) ◽  
pp. 214
Author(s):  
Udin Komarudin ◽  
Iftika Philo, Nia Nuraeni ◽  
Nissa Syifa Puspani
Keyword(s):  
Stress Analysis ◽  
Stress Ratio ◽  
Turbine Generator ◽  
Maximum Displacement ◽  
Maximum Hoop Stress ◽  
Field Information ◽  
Turbine Casing ◽  
Allowable Load ◽  
Load Analysis ◽  
Perspective Calculation

Thermal pipe expansion on the turbine greatly affects the performance of the turbine, mainly produces misalignment in turbines. The stress analysis on the pipe and the load on the nozzle is very important to ensure that the stress that occurs is still safe and the load that occurs on the nozzle is still below the allowable load. Field information is known, Steam type of 51-G-201-T, capacity 10 MW, total weighs 58 tons, weight casing 37 tons, which has been operating since July 1989, has been occur misalignment on turbines. Stress pipe and load analysis of turbine nozzles on the turbine using software (Autopipe V8i Select Series 3 Edition by Bentley). In this perspective, calculation methodologies were developed in order to do quick analysis of the most common configurations, according to the codes ASME B31.1 (Piping Power). The results of the pipe stress analysis showed that the maximum sustained stress ratio occurred at point A39 (0.32), maximum displacement stress ratio at point A39 (0.97) and maximum hoop stress ratio at point A09 (0.44), all values below 1. This shows that the stress is still safe. The result of load analysis on the turbine casing is the direction x = -880 kg, y = 6246.4kg, z = -3697.7kg, smaller than the weight of the 37 tones turbine casing, so misalignment is not caused by shifting the turbine casing.  

Brittle Fracture Assessments of Offshore PSVs

2014 ◽  
Author(s):  
Kannan Subramanian ◽  
Jorge Penso ◽  
Harbi Pordal ◽  
Graham McVinnie ◽  
Greg Garic
Keyword(s):  
Brittle Fracture ◽  
Stress Analysis ◽  
Stress Ratio ◽  
Operating Conditions ◽  
Ratio Method ◽  
Conservative Approach ◽  
Relief Valve ◽  
Valve Body ◽  
Fracture Assessment ◽  
Brittle Fractures

Pressure safety relief valve needs to be designed and operated to assure metal temperatures are not lower than the Minimum Allowable Temperature (MAT) to prevent brittle fractures. Design and fitness for service codes include general procedures to prevent brittle fractures. Design procedures in the codes are very conservative whereas fitness for service codes in some cases lack details. In the absence of a detailed brittle fracture assessment procedure for valves subject to significant low temperatures as a result of either Joule-Thompson effect or auto-refrigeration, an approach involving pressure based stress ratio method of ASME/API 579, Part 3 has been adopted and implemented. The initial and very conservative approach involved a worst case combination of the upstream pressure while calculating the stress ratio and a comparison of the newly established MAT with the downstream temperature. This conservative approach resulted in the disqualification of numerous PSVs studied in this work. Valve replacement and associated lost production time leads to high costs. A sophisticated and appropriately conservative brittle fracture assessment approach involving the use of computational fluid dynamics (CFD) followed by finite element method analysis (FEA) based stress analysis was adopted based on the concepts defined in ASME/API 579 and is presented in this paper. Predictive CFD analysis establishes more realistic temperatures and pressures in relation to the actual operating conditions. The CFD predicted pressure and temperature field is used to determine the stresses in the valve body using FEA methods. The stress analysis is followed by an intermediate brittle fracture assessment based on the procedures described in API 579 Part 3 using the actual PSV body metal temperatures and stresses established using the stress analysis. A discussion on the allowable stresses and stress components to be used in this intermediate assessment is also presented. If the PSVs cannot be qualified with this intermediate brittle fracture assessment, fracture mechanics evaluations are carried out to establish the limiting flaw sizes for the valves. In addition, the flaw tolerances of the valves are also established using reference flaw approach described in API 579, Part 9.

scholarly journals Analysis the Strength of Mild Steel Material on a Handcycle Bike Frame

2021 ◽  
Vol 21 (2) ◽  
pp. 80-86
Author(s):  
Andika Wisnujati ◽  
◽  
Rela Adi Himarosa ◽  
Keyword(s):  
Stainless Steel ◽  
Mild Steel ◽  
Tensile Test ◽  
Stress Analysis ◽  
Dynamic Load ◽  
Low Carbon ◽  
Maximum Displacement ◽  
Static Loads ◽  
Steel Material ◽  
Bicycle Frame

The frame is one of the most important parts in a series of constituents of a bicycle. The materials for making bicycle frames usually use tight and strong materials such as stainless steel, carbon and titanium. Mild steel is steel with low carbon, which is about 0.05-0.30%. After conducting a tensile test on the mild steel material used on the handcycle bicycle frame, the highest stress results were 1,093.87 N/mm² and the highest strain was 0.167%. For the results of stress analysis contained in the autodesk inverter, the von mesess results are obtained for men weighing 70 kg von mesess maximum 1400 mpa and women weighing 60 kg 1200 mpa. The maximum displacement generated for men weighing 70 kg 96.63 mm and women weighing 60 kg 82.83 mm. For the safety factor obtained based on the safety number from Dobrovolsky for static loads, the safety number is 1.25-2; dynamic load 2-3 shock load 3-5 while the safety rate that occurs in the load is 0.15 for men weighing 70 kg and 0.16 for women weighing 60 kg. So the handcycle bikes that we made are safe to ride because the results obtained are still below existing standards.

scholarly journals Seismic Behavior of Turbine-Generator Foundation under Strong Earthquake Action in Different Directions

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Dong An ◽  
Tie-jun Qu
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Seismic Behavior ◽  
Turbine Generator ◽  
Maximum Displacement ◽  
Scaled Model ◽  
Seismic Displacement ◽  
Limit Value ◽  
Seismic Design Code ◽  
Story Drift

In order to study seismic behavior of half-speed turbine-generator foundation under horizontal earthquake loading in different directions, the 1/10 scaled model was designed and fabricated. The rigid foundation of half-speed turbine-generator sets can be seen as a complex space frame system. The tests were conducted under eight earthquake waves in two directions separately. The loading directions were along the axis of longitudinal and transverse. The seismic response of displacement and story drift was investigated by a pseudodynamic test. The hysteresis behavior and crack propagation were analyzed. From the research, it is shown that the maximum displacement of the foundation under the earthquake of intensity 7 is 15.20 mm (longitudinal), basically in the range of elastic deformation. The seismic response of earthquake input in different directions is obviously different. Under the same earthquake input, the seismic displacement along the axis of longitudinal is larger than that of transverse. Under the rarely earthquake of intensity 8, the foundation still keeps good working condition. The maximum elastic-plastic story drift is 1/191 under the limit value 1/50 provided in the Code for Seismic Design of Buildings. The deformation capacity of the structure meets the requirements of the current seismic design code of China.

STRUCTURAL STRESS ANALYSIS ON THE RUBBER DIAPHRAGM OF AIR-OPERATED VALVE

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4565-4570 ◽  
Author(s):  
YOUNG-SHIN LEE ◽  
TAIK-DONG CHO ◽  
SUNG-HO KO ◽  
HYUN-SEUNG LEE ◽  
SUNG-KY SHIN
Keyword(s):  
Stress Analysis ◽  
Maximum Stress ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Thickness Change ◽  
Damage Rate ◽  
Section Area ◽  
Edge Part ◽  
Edge Side ◽  
Spring Support

Air-operated valves are used extensively in the power-generation industry for process control and system isolation functions. A study on the prevention of damage of an air operated valve is very important. Specially, diaphragm in an actuator of an air-operated valve has the highest damage rate. In this study, the stress of diaphragm with thickness change is analyzed. For this analysis, four experiments were conducted to obtain material properties of rubber. A stress analysis is carried out by commercial FEM code, ANSYS 8.0. It is compared with tension test to verify finite element analysis. From the result of analysis, the maximum stress happened at flange edge part, and the maximum displacement happened between flange edge and spring support. This study also finds out effect of the thickness about variable thickness. Even if a section area is same, the maximum stress is varied with the thickness of edge side.

scholarly journals Performance Measurement of a Compact Generator - Hydro Turbine System

2015 ◽  
Vol 5 (6) ◽  
pp. 1252 ◽  
Author(s):  
Pudji Irasari ◽  
Priyono Sutikno ◽  
Puji Widiyanto ◽  
Qidun Maulana
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Turbine Generator ◽  
Water Stream ◽  
Hydro Turbine ◽  
Steel Material ◽  
Low Head ◽  
Turbine Casing ◽  
Turbine Shaft ◽  
Generator Performance

<p>This study aims to investigate the characteristic of a compact generator – hydro turbine system. The generator is of permanent magnet type and the turbine operates in a very low head. The integration of the two components is conducted in such a way that simplifies the construction of the conventional turbine generator. The method is by mounting the generator stator to the turbine casing and the permanent magnets are assembled in the perimeter of the turbine blade rotor. This simple construction is approached by making the stator from individual teeth and yoke. The permanent magnet generator (PMG) is designed to produce the nominal power of 300 Watt 50 Hz at 83 rpm of turbine shaft. All components of the integrated turbine- generator are totally immersed in the water stream. The stator has to be hermitic to avoid water entering the spool. Another issue investigated is the influence of the type of the stator inner casing material to the generator performance. The results show, the PVC material for inner casing has a good influence to the generator performance compared with the mild steel material.</p>

Determination of Gas Pipeline Soil Overburden Compaction Multiplier in CAESAR II

2013 ◽  
Vol 448-453 ◽  
pp. 1378-1381
Author(s):  
Li Qiong Chen ◽  
Xiao Yu Han ◽  
Shi Juan Wu
Keyword(s):  
Stress Analysis ◽  
Stress Ratio ◽  
Gas Pipeline ◽  
Mean Stress ◽  
Secondary Stress ◽  
Stress Changes

Backfill is needed after putting pipes in the trench and the stress changes with the change of overburden compaction multiplier. We use CAESAR II to do stress analysis and draw the reasonable overburden compaction multiplier on a gas pipeline. By changing the soil overburden compaction multiplier and comparing pipes mean stress value, when the overburden compaction multiplier is set to 3, operation, primary and secondary stress ratio would reach minimum. And with the increase of overburden compaction multiplier, the stress ratio increases slightly.

MHI Approach to Upgrading Old Steam Turbines

2005 ◽  
Author(s):  
Yoshihiro Minami ◽  
Nobuhiro Osaki ◽  
Yuji Akaishi ◽  
William Newsom
Keyword(s):  
Steam Turbine ◽  
Power Plants ◽  
Performance Enhancement ◽  
Steam Turbines ◽  
Improve Performance ◽  
Turbine Generator ◽  
Turbine Component ◽  
Performance Deterioration ◽  
Turbine Casing ◽  
And Performance

As a result of high operation hours, older power plants have been subject to function and performance deterioration. As a result, there is an increased need to upgrade steam turbine units to improve performance and increase output. By studying the two performance enhancement upgrade projects listed below, you will be introduced to the design, manufacture and on-site installation work for the modification of a turbine generator. Also discussed is Mitsubishi’s method of harmonizing the new equipment/components with the existing non-OEM steam turbine. Both projects began in late 2003 and were successfully completed in early 2004 by Mitsubishi Heavy Industries, Ltd. (MHI). All delivery, installation and commissioning requirements were met and guaranteed performance was achieved for both units. • HP Turbine Component Upgrade – Pennsylvania, USA; • Modification of Turbine Casing – Korea.

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