An experimental study of effects on tube to tube sheet expansion joint grip strength due to seal welding or blanking of adjacent bank tubes of bi-drum boiler

2020 ◽  
Author(s):  
R. Yoganathan ◽  
Anand Ramanathan
Keyword(s):  
Experimental Study ◽  
Grip Strength ◽  
Tube Sheet ◽  
Expansion Joint ◽  
Drum Boiler

The Numerical and Experimental Study of a Power Plant Condenser

1993 ◽  
Vol 115 (2) ◽  
pp. 435-445 ◽  
Author(s):  
C. Zhang ◽  
A. C. M. Sousa ◽  
J. E. S. Venart
Keyword(s):  
Experimental Study ◽  
Power Plant ◽  
Tube Bundle ◽  
Control Volume ◽  
Water Pressure ◽  
Three Dimensional ◽  
Tube Sheet ◽  
Data Set ◽  
Numerical Predictions ◽  
Inlet Tube

A numerical and experimental study to evaluate the performance of a power plant condenser has been carried out. Numerically, physically relevant effects are taken into consideration through a quasi-three-dimensional approach. The equations governing the conservation of mass, momentum, and air mass fraction are solved in primitive variable form using a semi-implicit consistent control-volume formulation in which a segregated pressure correction linked algorithm is employed. The modeling of the condenser geometry, including tube bundle and baffle plates, is carried out based on a porous medium concept using applicable flow, heat, and mass transfer resistances. The measurement program included determinations of the steam pressures on the tube bundle perimeter (96 points), steam temperatures (96 locations), inlet tube sheet water pressure distributions (26 measurements), outlet tube sheet flows and temperatures (26 points), hot well flow, and enthalpy in addition to all makeup and extraction flow rates as a function of load. The measurement program and its implementation are briefly described. One data set is compared with the numerical predictions.

scholarly journals ANALISA TERMOHIDROLIKA KERUSAKAN KONDENSOR ORTHO DICHLOROBENZENE TIPE SHELL DAN TUBE

2015 ◽  
Vol 11 (1) ◽  
Author(s):  
Bambang Teguh P. ◽  
Riki Jaka Komara
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Tube Sheet ◽  
Expansion Joint ◽  
Shell And Tube

Telah terjadi kerusakan pada sejumlah tube pada kondensor Ortho Dichlorobenzene (ODCB). Kondensor ODCB adalah jenis shell and tube tipe BEM, posisi vertikal, dengan expansion joint pada shell. ODCB mengalir di sisi tube dan air pendingin (CW) mengalir di sisi shell secara paralel dari atas ke bawah. Hasil uji material menyimpulkan bahwa kerusakan berupa Stress Corrosion Cracking (SCC) yang disebabkan oleh tegangan bengkok akibat ekspansi tube yang tertahan. Namun demikian, ternyata retakan tube terjadi tidak pada tengah-tengah bentangan panjang tube melainkan pada jarak sekitar 450 – 500 mm dari tube sheet, tidak jauh dari shell inlet nozlle. Tujuan studi ini adalah untuk mempelajari fenomena termohidrolika lokal yang menyebabkan kerusakan tube. Hasil simulasi menunjukkan pada jarak sekitar 450 – 500 mm dari tube sheet, CW di sisi shell mulai mendidih dan ODCB di sisi tube mulai terkondensasi. Uap air yang terbentuk mengisi ruang shell bagian atas. Proses pendinginan di zona ini menjadi sangat buruk dan mengakibatkan gradien temperatur dinding tube ke arah longitudinal cukup tinggi. Gradien temperatur yang tinggi menyebabkan kekuatan dinding tube menurun, sehingga saat ekspansi tube tertahan, tube akan bengkok pada zona tersebut.Kata kunci: Ortho Dichlorobenzene, kondesor, shell and tube, BEM, aliran paralel, SS 316 L, stress corrosion cracking, tube bengkok, kondensasi, pendidihan

Calculation of Acoustical Resonances in Irregular Cavities With Application to Noise-Induced Stress in Expansion Joints

1976 ◽  
Vol 98 (1) ◽  
pp. 101-108 ◽  
Author(s):  
G. Baylac ◽  
J. Planchard ◽  
J. P. Gregoire ◽  
C. Pailly
Keyword(s):  
Experimental Study ◽  
Nuclear Reactor ◽  
Acoustic Behavior ◽  
Test Results ◽  
Expansion Joint ◽  
Resonant Frequencies ◽  
Expansion Joints ◽  
Induced Stress ◽  
Flow Induced Noise ◽  
Good Agreement

An analytical and experimental study of the acoustic behavior of seven and nine corrugation expansion joints (bellows) used in a nuclear reactor is presented. Resonant frequencies obtained from a computer program using a matrix method are given. Experimental test results on seven corrugation expansion joints are in good agreement with the computations. It is concluded that the calculation of acoustic frequencies of expansion joints with internal sleeves can be utilized to avoid the coincidence of these frequencies with those of a mechanical or flow-induced noise nature and thus reduce the loads on expansion joint corrugations.

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

Sign in / Sign up

Export Citation Format

Share Document